Filed pursuant to Rule 424(b)(1)
                                                      Registration No. 333-75490

                                 [BROOKS LOGO]

                                 April 8, 2002

Dear Brooks Stockholders:

    The Brooks Automation, Inc. 2002 Annual Meeting of Stockholders will be held
on May 13, 2002 at 10:00 a.m. Eastern Standard Time at our corporate
headquarters, 15 Elizabeth Drive, in Chelmsford, Massachusetts. I would like to
explain the proposals that will be considered at the meeting and why I need you
to vote with management on these proposals.

    Proposal No. 1 asks for your vote in favor of the issuance of shares of
Brooks common stock to complete the transaction to acquire PRI Automation, Inc.
As you know, the semiconductor industry that we serve, while full of opportunity
and growth, poses many challenges with its rapidly changing technology and
cyclical economic trends. In this dynamic environment, it is essential for a
company to be able to provide more complete solutions and accelerate its
learning cycles, while strengthening its financial standing. One of the
important ways of accomplishing these objectives is through acquisitions of
other companies such as PRI. This acquisition is extremely complementary to the
existing Brooks product line and business structure, and only strengthens our
position as the leader in the highly competitive automation market. The new
company will be known as Brooks-PRI Automation, Inc., and will continue to be
traded under the symbol "BRKS." I urge you to vote in favor of Proposal No. 1.

    Upon your favorable vote for Proposal No. 1, you will be asked in Proposal
No. 4 to approve an amendment to our certificate of incorporation to increase
the number of authorized shares of Brooks common stock from 43,000,000 to
100,000,000, since the number of shares outstanding and reserved for issuance
would exceed the current authorized limit if we complete the acquisition of PRI.
This increase also would allow the Brooks management team to have the financial
instruments necessary to continue to execute our strategy of growing the company
and bringing value to the stockholders. In addition to your vote in favor of
Proposal No. 1, we need your vote in Proposal No. 3 to elect five directors to
serve for the ensuing year. If Proposal No. 1 is approved, we will expand the
board from five to seven and appoint two representatives from PRI Automation,
Mitchell G. Tyson and Kenneth M. Thompson, to serve for the ensuing year.

    In Proposal Nos. 5, 6 and 7, we ask for your vote on the amendment of three
of Brooks' stock plans to increase the number of shares of Brooks common stock
reserved for use under the plans. The purpose of these increases is to enable
Brooks to award equity incentives to its employees and nonemployee directors.
Without these additional shares, Brooks could be at a disadvantage in attracting
and retaining valuable persons necessary to achieve success.

    Finally, Proposal No. 2 asks for your vote in favor of granting our
management team the authority to adjourn the Brooks annual meeting in the event
that we do not receive sufficient votes to approve Proposal Nos. 1 or 4, so that
our board of directors can solicit additional proxies in favor of the proposals.

    The accompanying joint proxy statement/prospectus provides detailed
information about Brooks and PRI and the merger, as well as each of the other
proposals described above. A copy of the merger agreement is included as
Appendix A to the joint proxy statement/prospectus. We also have enclosed a copy
of Brooks' annual report for 2001, which contains additional information about
Brooks. Please give all of this information your careful attention.

    PLEASE GIVE PARTICULARLY CAREFUL CONSIDERATION TO THE DISCUSSION IN THE
SECTION ENTITLED "RISK FACTORS" BEGINNING ON PAGE 18 OF THE JOINT PROXY
STATEMENT/PROSPECTUS.

    Our common stock is listed on the Nasdaq National Market under the symbol
"BRKS." On April 8, 2002, the last reported sale price of our common stock was
$37.40 per share.

    On behalf of the board of directors, I urge you strongly to vote in favor of
these proposals. Your vote is important to our company, and all items need to be
voted.

                                          Sincerely,

                                          /s/ Robert J. Therrien
                                          Robert J. Therrien
                                          President & Chief Executive Officer

    Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved of this transaction or the securities of
Brooks to be issued in the merger, or determined if this joint proxy
statement/prospectus is accurate or complete. Any representation to the contrary
is a criminal offense.

    This joint proxy statement/prospectus is dated April 8, 2002, and was first
mailed to stockholders on or about April 15, 2002.


                  NOTICE OF ANNUAL MEETING OF STOCKHOLDERS OF

                            BROOKS AUTOMATION, INC.
                           TO BE HELD ON MAY 13, 2002

     The Annual Meeting of Stockholders of Brooks Automation, Inc. will be held
on May 13, 2002 at 10:00 a.m., local time, at the company's corporate
headquarters located at 15 Elizabeth Drive, Chelmsford, Massachusetts 01824, for
the following purposes:

          1.  To consider and vote upon the proposal to issue shares of Brooks
     common stock, par value $.01 per share, in the acquisition by Brooks of PRI
     Automation, Inc., in accordance with the Amended and Restated Agreement and
     Plan of Merger dated as of December 18, 2001, among Brooks, Pontiac
     Acquisition Corp., and PRI. A copy of the merger agreement is attached to
     this joint proxy statement/prospectus as Appendix A.

          2.  To consider and vote upon a proposal to grant Brooks' management
     the discretionary authority to adjourn the annual meeting to a date or
     dates not later than June 7, 2002, if necessary to enable Brooks'
     management to solicit additional proxies in favor of Proposal Nos. 1 and 4.

          3.  To elect five directors to serve for the ensuing year and until
     their successors are duly elected.

          4.  If Proposal No. 1 is approved, to consider and vote upon a
     proposal to amend Brooks' certificate of incorporation to increase the
     number of authorized shares of common stock from 43,000,000 to 100,000,000.
     Even if Proposal No. 4 is approved, the amendment to the certificate of
     incorporation will only take effect if the merger is completed.

          5.  If Proposal No. 1 is approved, to consider and vote upon a
     proposal to amend Brooks' 1995 Employee Stock Purchase Plan to increase the
     number of shares reserved for issuance under the plan from 750,000 to
     1,500,000. Even if Proposal No. 5 is approved, the amendment to the stock
     purchase plan will only take effect if the merger is completed.

          6.  To consider and vote upon a proposal to amend Brooks' 1993
     Nonemployee Director Stock Option Plan for the following purposes: (i) if
     Proposal No. 1 is approved, to increase the shares reserved for issuance
     thereunder from 190,000 to 690,000, and to effect additional changes
     relating to grants of options under the plan; or (ii) if Proposal No. 1 is
     not approved, to increase the number of shares reserved for issuance under
     the plan from 190,000 to 490,000.

          7.  To consider and vote upon a proposal to amend Brooks' 2000
     Combination Stock Option Plan for the following purpose: (i) if Proposal
     No. 1 is approved, to increase the number of shares reserved for issuance
     under the plan from 1,000,000 to 6,000,000; or (ii) if Proposal No. 1 is
     not approved, to increase the number of shares reserved for issuance under
     the plan from 1,000,000 to 3,000,000.

          8.  To transact such other business as may properly come before the
     meeting.

     The Board of Directors has fixed April 8, 2002 as the record date for
determining the stockholders entitled to notice of, and to vote at, the Annual
Meeting.

     All stockholders are cordially invited to attend the Annual Meeting. To
ensure your representation at the Annual Meeting, however, you are urged to
authorize your proxy by following one of these steps as promptly as possible:

          (A) Complete, date, sign and return the enclosed Proxy Card (a
     postage-prepaid envelope is enclosed for that purpose); or

          (B) Vote via the Internet (see the instructions on the enclosed Proxy
     Card); or

          (C) Vote via telephone (toll-free) in the United States and Canada
     (see the instructions on the enclosed Proxy Card).

     The Internet and telephone voting procedures are designed to authenticate
stockholders' identities, to allow stockholders to vote their shares and to
confirm that their instructions have been properly recorded.


Specific instructions to be followed by any registered stockholder interested in
voting via the Internet or telephone are set forth on the enclosed Proxy Card.

     Any stockholder attending the Annual Meeting may vote in person even if
that stockholder has returned a Proxy Card or voted via the Internet or
telephone.

                                          By Order of the Board Of Directors

                                          /s/ Lawrence M. Levy

                                          LAWRENCE M. LEVY,
                                          Secretary

Chelmsford, Massachusetts
April 15, 2002

                             YOUR VOTE IS IMPORTANT

     YOU ARE URGED TO PROMPTLY AUTHORIZE YOUR PROXY BY FOLLOWING THE VOTING
INSTRUCTIONS, SO THAT IF YOU ARE UNABLE TO ATTEND THE ANNUAL MEETING YOUR SHARES
MAY NEVERTHELESS BE VOTED. HOWEVER, YOUR PROXY MAY BE REVOKED AT ANY TIME PRIOR
TO EXERCISE BY FILING WITH THE SECRETARY OF THE COMPANY A WRITTEN REVOCATION, BY
AUTHORIZING A PROXY (BY EXECUTING A PROXY OR BY MAKING AN AUTHORIZED INTERNET OR
TELEPHONE COMMUNICATION) AT A LATER DATE, OR BY ATTENDING AND VOTING AT THE
ANNUAL MEETING.


                             [PRI AUTOMATION LOGO]

                                 April 8, 2002

Dear PRI Automation, Inc. Stockholders:

     PRI Automation, Inc. will hold a special meeting of stockholders on May 13,
2002 at 2:00 p.m. Eastern Standard Time at the offices of Foley, Hoag & Eliot
LLP, One Post Office Square, Sixteenth Floor, Boston, Massachusetts 02109. I
would like to explain the proposals that will be considered at the meeting and
why you should vote with management on these proposals.

     Proposal No. 1, the principal reason for this special meeting, is to ask
for your vote in favor of Brooks Automation, Inc.'s proposed acquisition of PRI.
If the acquisition is approved, PRI stockholders will receive 0.52 shares of
Brooks common stock in exchange for each share of PRI common stock they hold.
The number of shares of Brooks common stock to be issued will not be adjusted
based upon changes in the market price of the common stock of Brooks or PRI. As
a result, the value of the Brooks common stock to be received by PRI
stockholders will depend on the market price of Brooks common stock at the time
of the merger. Brooks common stock is traded on the Nasdaq National Market under
the symbol "BRKS." On April 8, 2002, the last reported sale price of Brooks
common stock was $37.40 per share. I urge you to vote in favor of Proposal No.
1.

     Proposal No. 2 is to ask for your vote in favor of granting our management
the authority to adjourn the PRI special meeting in the event that we do not
receive sufficient votes to approve Proposal No. 1, so that our management can
solicit additional proxies in favor of the proposal.

     Proposal No. 3 is to ask for your vote in favor of an amendment to PRI's
2000 employee stock purchase plan to increase the maximum number of shares in
the plan to 850,000. I recommend that you vote in favor of this proposal.

     The accompanying joint proxy statement/prospectus provides detailed
information about Brooks and PRI and the merger, as well as the other proposals
described above. Please give this information your careful attention.

     FOR A MORE COMPLETE DESCRIPTION OF THE MERGER AND RISK FACTORS YOU SHOULD
CONSIDER IN CONNECTION WITH YOUR VOTE, YOU SHOULD CAREFULLY CONSIDER THE
DISCUSSION IN THE SECTIONS ENTITLED "RISK FACTORS" BEGINNING ON PAGE 18 AND "THE
MERGER" BEGINNING ON PAGE 45.

     Our common stock is listed on the Nasdaq National Market under the symbol
"PRIA". On April 8, 2002, the last reported sale price of our common stock was
$19.39 per share.

     On behalf of the board of directors, I strongly urge you to vote in favor
of these proposals. Your vote is important to our company, and all of the items
need to be voted. Thank you.

                                          Sincerely,

                                          /s/ Mitchell G. Tyson
                                          Mitchell G. Tyson,
                                          President and Chief Executive Officer

     Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved of this transaction or the securities of
Brooks to be issued in the merger, or determined if this joint proxy
statement/prospectus is accurate or complete. Any representation to the contrary
is a criminal offense.

     This joint proxy statement/prospectus is dated April 8, 2002, and was first
mailed to stockholders on or about April 15, 2002.


                              PRI AUTOMATION, INC.

                             805 MIDDLESEX TURNPIKE
                         BILLERICA, MASSACHUSETTS 01821
                             ---------------------

                   NOTICE OF SPECIAL MEETING OF STOCKHOLDERS
                           TO BE HELD ON MAY 13, 2002
                             ---------------------

     NOTICE IS HEREBY GIVEN THAT a special meeting of stockholders of PRI
Automation, Inc., a Massachusetts corporation, will be held on May 13, 2002 at
the offices of Foley, Hoag & Eliot LLP, One Post Office Square, Sixteenth Floor,
Boston, Massachusetts 02109, commencing at 2:00 p.m., local time, to consider
and vote upon:

          1.  A proposal to approve and adopt the amended and restated agreement
     and plan of merger dated as of December 18, 2001 among Brooks Automation,
     Inc., Pontiac Acquisition Corp. and PRI;

          2.  A proposal to grant PRI's management the discretionary authority
     to adjourn the special meeting to a date or dates not later than June 7,
     2002, if necessary to enable PRI's management to solicit additional proxies
     in favor of Proposal No. 1;

          3.  A proposal to approve an amendment to PRI's 2000 employee stock
     purchase plan to increase the maximum number of shares of PRI common stock
     that may be issued under the plan from 350,000 to 850,000; and

          4.  Such other business as may properly come before the special
     meeting or any adjournment of the meeting.

     Under Sections 85 through 98 of the Massachusetts Business Corporation Law,
PRI stockholders who properly object to the proposal to approve and adopt the
merger agreement have the right to demand an appraisal of, and payment for,
their shares if PRI completes the merger. If the merger agreement is approved by
the stockholders of PRI at the special meeting and the merger is effected by
PRI, then any stockholder (1) who files with PRI, before the taking of the vote
on the approval of such action, written objection to the proposed action stating
that he, she or it intends to demand payment for his, her or its shares if the
action is taken, and (2) whose shares are not voted in favor of such action, has
or may have the right to demand in writing from the surviving corporation,
within twenty days after the date of mailing to him, her or it of notice in
writing that the merger has become effective, payment for his, her or its shares
and an appraisal of the value thereof. The surviving corporation and any such
stockholder shall in such case have the rights and duties and shall follow the
procedure set forth in Sections 88 through 98 of the Massachusetts Business
Corporation Law.

     For a more complete description of your statutory appraisal rights, see
"Special Meeting of PRI Stockholders -- Appraisal or Dissenters' Rights"
beginning on page 43 and the full text of Sections 85 through 98 of the
Massachusetts Business Corporation Law included as Appendix B to the
accompanying joint proxy statement/prospectus.

     PRI's board of directors has fixed the close of business on April 8, 2002
as the record date for the determination of the stockholders of PRI entitled to
receive notice of the special meeting and to vote at the meeting or any
adjournment of the meeting. Only stockholders of record at the close of business
on that date are entitled to receive notice of the special meeting and to vote
at the meeting and any adjournment of the meeting. PRI will make a list of the
stockholders entitled to vote at the special meeting or any adjournment of the
meeting available for inspection at its offices. Whether or not you plan to
attend the special meeting, please promptly complete and return the enclosed
proxy card in the reply envelope. Please see the instructions included with your
proxy card.

                                         By order of the Board of Directors

                                         /s/ Robert L. Birnbaum

                                         Robert L. Birnbaum,
                                         Clerk

Dated: April 15, 2002
Billerica, Massachusetts
                             YOUR VOTE IS IMPORTANT
       PLEASE SIGN AND RETURN THE ENCLOSED PROXY CARD, WHETHER OR NOT YOU
                          PLAN TO ATTEND THE MEETING.


                       SOURCES OF ADDITIONAL INFORMATION

     If you are a Brooks stockholder, this joint proxy statement/prospectus is
accompanied by a copy of Brooks' annual report for the fiscal year ended
September 30, 2001. For both Brooks and PRI stockholders, this joint proxy
statement/prospectus incorporates important business and financial information
about Brooks and PRI by reference to documents that are not included in or
delivered with this joint proxy statement/prospectus. This information is
available to you without charge upon your written or oral request. You can
obtain the documents incorporated by reference in this joint proxy
statement/prospectus by requesting them in writing or by telephone from the
appropriate company at the following addresses and telephone numbers:


                                            
  Brooks Automation, Inc. Investor Relations      PRI Automation, Inc. Investor Relations
              15 Elizabeth Drive                           805 Middlesex Turnpike
       Chelmsford, Massachusetts 01824                 Billerica, Massachusetts 01821
            Phone: (978) 262-5799                          Phone: (978) 670-4270


     TO OBTAIN TIMELY DELIVERY OF REQUESTED DOCUMENTS IN ADVANCE OF THE
STOCKHOLDER MEETINGS, YOU SHOULD MAKE YOUR REQUEST NO LATER THAN MAY 6, 2002.

     For more information on the matters incorporated by reference in this joint
proxy statement/prospectus, please see "Where You Can Find More Information" on
page 156.


                               TABLE OF CONTENTS



                                                               PAGE
                                                               ----
                                                            
QUESTIONS AND ANSWERS ABOUT THE MERGER......................     1
SUMMARY.....................................................     7
BROOKS' RECENT DEVELOPMENTS.................................    10
BROOKS SELECTED HISTORICAL CONSOLIDATED FINANCIAL DATA......    11
PRI SELECTED HISTORICAL CONSOLIDATED FINANCIAL DATA.........    13
SUMMARY UNAUDITED PRO FORMA COMBINED CONDENSED FINANCIAL
  DATA......................................................    14
COMPARATIVE PER SHARE DATA..................................    16
CAUTIONARY STATEMENT CONCERNING FORWARD-LOOKING
  STATEMENTS................................................    17
RISK FACTORS................................................    18
ANNUAL MEETING OF BROOKS STOCKHOLDERS.......................    36
SPECIAL MEETING OF PRI STOCKHOLDERS.........................    40
BROOKS AND PRI PROPOSAL NO. 1 APPROVAL OF ADOPTION OF THE
  MERGER AGREEMENT AND THE MERGER...........................    45
  THE MERGER................................................    45
  CLOSING OF THE MERGER.....................................    45
  CONVERSION OF PRI SHARES IN THE MERGER....................    45
  OWNERSHIP OF BROOKS COMMON STOCK FOLLOWING THE MERGER.....    46
  MATERIAL CONTACTS BETWEEN BROOKS AND PRI..................    46
  DELISTING AND DEREGISTRATION OF PRI COMMON STOCK AFTER THE
     MERGER.................................................    46
  PRI STOCK OPTIONS AND WARRANTS............................    46
  TREATMENT OF RIGHTS UNDER PRI'S EMPLOYEE STOCK PURCHASE
     PLAN...................................................    47
  TREATMENT OF PRI CANADA EXCHANGEABLE SHARES...............    47
  THE EXCHANGE AGENT........................................    47
  EXCHANGE OF PRI STOCK CERTIFICATES FOR BROOKS STOCK
     CERTIFICATES...........................................    47
  TRANSFER OF OWNERSHIP; DISTRIBUTIONS WITH RESPECT TO
     UNEXCHANGED SHARES.....................................    47
  BACKGROUND OF THE MERGER..................................    48
  JOINT REASONS FOR THE MERGER..............................    53
  BROOKS' REASONS FOR THE MERGER AND RECOMMENDATION OF
     BROOKS' BOARD OF DIRECTORS.............................    54
  OPINION OF BROOKS' FINANCIAL ADVISOR......................    55
  INTERESTS OF BROOKS' MANAGEMENT IN THE MERGER AND
     POTENTIAL CONFLICTS OF INTEREST........................    62
  PRI'S REASONS FOR THE MERGER AND RECOMMENDATION OF PRI'S
     BOARD OF DIRECTORS.....................................    62
  OPINION OF PRI'S FINANCIAL ADVISOR........................    65
  INTERESTS OF PRI'S MANAGEMENT IN THE MERGER AND POTENTIAL
     CONFLICTS OF INTEREST..................................    72
  MATERIAL FEDERAL INCOME TAX CONSIDERATIONS................    73
  MATERIAL CANADIAN FEDERAL INCOME TAX CONSIDERATIONS.......    75
  REGULATORY APPROVALS......................................    77
  ACCOUNTING TREATMENT......................................    78
  LISTING OF BROOKS COMMON STOCK TO BE ISSUED IN THE
     MERGER.................................................    78
  FEDERAL SECURITIES LAWS CONSEQUENCES; STOCK TRANSFER
     RESTRICTIONS...........................................    79
  MANAGEMENT OF BROOKS FOLLOWING THE MERGER.................    79
  OPERATIONS FOLLOWING THE MERGER...........................    79
THE MERGER AGREEMENT........................................    80
  THE MERGER AGREEMENT AND RELATED DOCUMENTS................    80
  STRUCTURE OF THE MERGER...................................    80
  EFFECTIVE TIME............................................    80
  WHAT PRI STOCKHOLDERS WILL RECEIVE IN THE MERGER..........    80
  TREATMENT OF PRI STOCK OPTIONS AND WARRANTS...............    80
  PROCEDURES FOR SURRENDER OF CERTIFICATES; FRACTIONAL
     SHARES.................................................    81
  APPOINTMENT OF ADDITIONAL DIRECTORS TO THE BOARD OF
     DIRECTORS OF BROOKS....................................    81
  NAME OF BROOKS AFTER THE MERGER...........................    82
  REPRESENTATIONS AND WARRANTIES............................    82
  COVENANTS.................................................    83
  FEES AND EXPENSES.........................................    86


                                        i




                                                               PAGE
                                                               ----
                                                            
  ADDITIONAL AGREEMENTS.....................................    87
  CONDITIONS TO THE COMPLETION OF THE MERGER................    89
  TERMINATION OF THE MERGER AGREEMENT.......................    90
  AMENDMENTS................................................    90
  WAIVER AND EXTENSION......................................    90
RELATED AGREEMENTS..........................................    91
COMPARATIVE PER SHARE MARKET PRICE AND DIVIDEND DATA........    94
BROOKS AUTOMATION, INC. UNAUDITED PRO FORMA COMBINED
  CONDENSED FINANCIAL STATEMENTS............................    95
BROOKS AUTOMATION, INC. NOTES TO UNAUDITED PRO FORMA
  COMBINED CONDENSED FINANCIAL STATEMENTS...................    99
COMPARISON OF STOCKHOLDER RIGHTS............................   102
BROOKS AND PRI PROPOSAL NO. 2 ADJOURNMENT OF THE BROOKS
  ANNUAL MEETING AND THE PRI SPECIAL MEETING................   110
BROOKS PROPOSAL NO. 3 ELECTION OF BROOKS DIRECTORS..........   112
BROOKS PROPOSAL NO. 4 AMENDMENT OF BROOKS' CERTIFICATE OF
  INCORPORATION.............................................   114
BROOKS PROPOSAL NO. 5 AMENDMENT OF THE BROOKS 1995 EMPLOYEE
  STOCK PURCHASE PLAN.......................................   118
BROOKS PROPOSAL NO. 6 AMENDMENT OF THE BROOKS 1993
  NONEMPLOYEE DIRECTOR STOCK OPTION PLAN....................   121
BROOKS PROPOSAL NO. 7 AMENDMENT OF THE BROOKS 2000
  COMBINATION STOCK OPTION PLAN.............................   124
BROOKS BOARD OF DIRECTORS MEETINGS, COMMITTEES AND
  COMPENSATION..............................................   129
SECURITY OWNERSHIP OF DIRECTORS, NOMINEES, EXECUTIVE
  OFFICERS AND PRINCIPAL STOCKHOLDERS OF BROOKS.............   131
SECURITY OWNERSHIP OF DIRECTORS, EXECUTIVE OFFICERS AND
  PRINCIPAL STOCKHOLDERS OF PRI.............................   133
MANAGEMENT OF BROOKS........................................   134
BROOKS EXECUTIVE COMPENSATION AND OTHER MATTERS.............   135
CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS OF BROOKS....   145
PRI PROPOSAL NO. 3 AMENDMENT OF PRI'S 2000 EMPLOYEE STOCK
  PURCHASE PLAN.............................................   147
PRI EXECUTIVE COMPENSATION..................................   150
EXPERTS.....................................................   155
LEGAL MATTERS...............................................   155
WHERE YOU CAN FIND MORE INFORMATION.........................   156
APPENDIX A AMENDED AND RESTATED AGREEMENT AND PLAN OF
  MERGER....................................................   A-1
APPENDIX B MASSACHUSETTS BUSINESS CORPORATION LAW, SECTIONS
  85-98.....................................................   B-1
APPENDIX C FORM OF VOTING AGREEMENT BETWEEN BROOKS AND
  CERTAIN PRI STOCKHOLDERS..................................   C-1
APPENDIX D FORM OF VOTING AGREEMENT BETWEEN PRI AND CERTAIN
  BROOKS STOCKHOLDERS.......................................   D-1
APPENDIX E OPINION OF CREDIT SUISSE FIRST BOSTON
  CORPORATION...............................................   E-1
APPENDIX F OPINION OF MORGAN STANLEY & CO. INCORPORATED.....   F-1
APPENDIX G FORM OF AMENDMENT OF BROOKS' CERTIFICATE OF
  INCORPORATION TO INCREASE THE NUMBER OF AUTHORIZED
  SHARES....................................................   G-1


                             ---------------------

Acutran(R), APCLink(TM), ARRC(TM), CELLworks(R), ClusterLink(TM),
ControlVision(TM), ControlVisionJ(TM), Cornerstone(R), ERGOSPEED 3800(TM),
ERGOSPEED II(TM), ExpressLink(TM), FACTORYworks(R), FabExpress(TM),
FabWorks(TM), FACTORYworks(R), FASTech(R), FASTech Integration(R), Fastech
Integration, Inc.(R), FIXLOAD(TM), Gemini Express(TM), Hercules(R), Iridnet(R),
ISE 200(TM), LeapFrog(TM), LCDworks(TM), MagnaTran(R), MapTrak(TM), Marathon(R),
Marathon Express(R), Patterns(TM), RS/Series(R), SEARAMS(TM), SMC(TM),
Starfire(TM), STATIONworks(R), TEC-3000(TM), VCE(TM) and the Brooks logo are
trademarks of Brooks Automation, Inc.

Aeroloader(R), Promis Encore! (R), Promis(R), eQonnector(TM), E-volution(TM),
Hypatia(R), Factory Top(R), Waferstate(R), Interval Logic(R), The Power To Act
Effectively(R), Leverage(R), Preference Calculus(R), Repair-Based(R), Spike(R),
Spike++(R), Palette(R), PRI(TM), AeroTrak(TM), Encore! Performance(TM), Encore!
Process Composer(TM), EquipeSoft(TM), FAbuilder(TM), PR1ORITY(TM), Starbot(TM),
Starcon(TM), TransNet(TM), The Guardian(TM), The Silicon Machine(TM),
TurboStocker(TM), TRMS(TM) and the PRI logo are trademarks of PRI Automation,
Inc.

Each trademark, trade name or service mark of any other company appearing in
this joint proxy statement/prospectus belongs to its holder.
                                        ii


                     QUESTIONS AND ANSWERS ABOUT THE MERGER

     The following questions and answers are intended to address briefly some
commonly asked questions regarding the merger. These questions and answers may
not address all of the issues that may be important to you. Please refer to the
more detailed information contained elsewhere in this joint proxy
statement/prospectus, the appendices to this joint proxy statement/prospectus
and the documents incorporated by reference into this joint proxy
statement/prospectus.

Q:  WHY ARE THE COMPANIES PROPOSING THE MERGER?

A:  The Brooks board and the PRI board believe that by combining the highly
    complementary technologies, product lines, distribution channels and
    customer relationships of the two companies, the combined company will have
    the potential to realize long-term improved growth and profitability, and a
    stronger position in the semiconductor manufacturing equipment industry. To
    review the background and reasons for the merger in greater detail, see
    pages 48 through 73.

Q:  DO THE BOARDS OF DIRECTORS OF BROOKS AND PRI RECOMMEND VOTING IN FAVOR OF
    THE MERGER?

A:  Yes. The Brooks board of directors and the PRI board of directors each
    unanimously recommends voting in favor of the merger.

Q:  WHAT WILL STOCKHOLDERS OF BROOKS RECEIVE IN THE MERGER?

A:  Brooks stockholders will not receive any consideration in the merger, and
    the merger will not affect the number of shares of Brooks common stock that
    they hold. However, Brooks will be issuing shares of its common stock to PRI
    stockholders in connection with the merger, which will have a dilutive
    effect on the percentage ownership of each Brooks stockholder in the
    combined company.

Q:  WHAT WILL STOCKHOLDERS OF PRI RECEIVE IN THE MERGER?

A:  If the merger is completed, stockholders of PRI will receive 0.52 shares of
    Brooks common stock for each share of PRI common stock they hold. In
    addition, PRI stockholders will receive cash in lieu of any fractional
    shares of Brooks common stock.

Q:  WHAT HAPPENS IF THE TRADING PRICE OF BROOKS OR PRI COMMON STOCK CHANGES
    BEFORE THE MERGER?

A:  The number of shares of Brooks common stock to be issued for each share of
    PRI common stock will not be adjusted based upon changes in the market price
    of Brooks common stock or PRI common stock. As a result, the value of the
    Brooks common stock to be received in the merger will fluctuate as the
    market price of Brooks common stock fluctuates. Neither Brooks nor PRI has
    the right to terminate the merger agreement or to change the recommendation
    of its board of directors to its stockholders based on changes in the market
    price of Brooks or PRI common stock.

Q:  ARE THERE RISKS I SHOULD CONSIDER IN DECIDING WHETHER TO VOTE FOR THE
    MERGER?

A:  Yes. For example, the combined company might not realize the expected
    benefits of the merger. In evaluating the merger, you should carefully
    consider the risk factors discussed beginning on page 18.

Q:  WHAT ARE THE TAX CONSEQUENCES OF THE TRANSACTION TO ME?

A:  On the basis of the legal opinions we received from our tax counsel on
    December 19, 2001 and February 14, 2002 we anticipate that the acquisition
    of PRI by Brooks through the mergers described in this joint proxy
    statement/prospectus will constitute a tax-free reorganization for United
    States federal income tax purposes. Neither Brooks nor PRI will be obligated
    to complete the transaction unless each receives an opinion from its tax
    counsel to that effect. Brooks and PRI, in their discretion, may waive
    delivery of the additional closing tax opinions. Assuming the transaction
    qualifies as a tax-free reorganization, PRI stockholders who exchange their
    PRI common stock solely for Brooks common stock in the transaction generally
    will not recognize gain or loss for United States federal income tax
    purposes, except for gain or loss recognized because of cash received
    instead of fractional shares. For a general discussion of the tax
    consequences of the transaction, see pages 73 through 76.

                                        1


    The tax consequences to you will depend on the facts and circumstances of
    your own situation. Please consult your tax advisor for a full understanding
    of the tax consequences to you.

    In the event that, before the stockholder meeting, it is determined that an
    additional closing tax opinion cannot be issued and Brooks and PRI are
    willing to waive the opinion delivery requirement, but the completion of the
    merger would result in tax consequences that are so materially different to
    the stockholders or companies from those we have described as to affect the
    stockholders' decision on the merger, or if it is determined that the
    transaction will not constitute a tax-free reorganization, we will provide
    to each holder of record on the record date a new, complete joint proxy
    statement/prospectus describing the differences in tax consequences from
    those described herein. We will also provide a new proxy card along with the
    new joint proxy statement/prospectus in the event that you wish to revoke
    any earlier proxy and change your vote. If, after the stockholder meetings,
    but prior to the completion of the merger, a material difference in tax
    consequences is discovered, or it is determined that the transaction will
    not constitute a tax-free reorganization, it would be necessary to convene
    new stockholder meetings.

Q:  WHO WILL LEAD THE COMBINED COMPANY AFTER THE MERGER?

A:  Upon completion of the merger, the Brooks board of directors will be
    expanded by two seats from five to seven members, and the two new positions
    will be filled by Mitchell G. Tyson, the current president and chief
    executive officer of PRI, and by Kenneth M. Thompson, a current member of
    the board of directors of PRI. Robert J. Therrien and Ellen B. Richstone
    will continue to serve as Brooks' president and chief executive officer, and
    senior vice president, finance and administration and chief financial
    officer, respectively. The other current officers of Brooks will continue to
    serve in their current positions. Mr. Tyson has agreed to serve as special
    assistant to the chief executive officer of Brooks for a period of six
    months from the date the merger is completed.

Q:  IF I DO NOT APPROVE THE MERGER, AM I ENTITLED TO DISSENTERS' OR APPRAISAL
    RIGHTS?

A:  Under Delaware law, holders of Brooks common stock are not entitled to any
    appraisal or dissenters' rights. Under Massachusetts law, PRI stockholders
    are entitled to appraisal rights in connection with the merger. To exercise
    appraisal rights, a PRI stockholder must:

        - provide written notice to PRI before the taking of the vote of the PRI
          stockholders on the approval of the merger agreement stating his, her
          or its intention to exercise appraisal rights;

        - vote against the approval of the merger agreement or abstain from
          voting; and

        - comply with other procedures required by Sections 85 through 98 of the
          Massachusetts Business Corporation Law.

     A copy of Sections 85 through 98 is attached to this joint proxy
statement/prospectus as Appendix B.

Q:  WHAT SPECIFIC PROPOSALS ARE BROOKS STOCKHOLDERS BEING ASKED TO CONSIDER?

A:  Brooks stockholders are being asked to:



                                                                               BROOKS BOARD
PROPOSAL NO.                                                                  RECOMMENDATION
------------                                                                  --------------
                                                                        
     1.        Approve the issuance of Brooks common stock in the              In Favor
               Brooks-PRI merger; the approval will include the approval of
               the appointment of Mitchell G. Tyson and Kenneth M.
               Thompson, two representatives from PRI, to the Brooks board
               of directors and the change of the company name to Brooks-
               PRI Automation, Inc.;
     2.        If necessary, adjourn the Brooks 2002 annual meeting until      In Favor
               sufficient votes to approve Proposal Nos. 1 and 4 are
               obtained;
     3.        Elect five directors to Brooks' board of directors;             In Favor


                                        2




                                                                               BROOKS BOARD
PROPOSAL NO.                                                                  RECOMMENDATION
------------                                                                  --------------
                                                                        
     4.        Increase the authorized number of shares of Brooks common       In Favor
               stock from 43,000,000 to 100,000,000 if Proposal No. 1 is
               approved;
     5.        Increase the number of shares of Brooks common stock            In Favor
               reserved for issuance under the 1995 employee stock purchase
               plan from 750,000 to 1,500,000 if Proposal No. 1 is
               approved;
     6.        Increase the number of shares of Brooks common stock            In Favor
               reserved for issuance under the 1993 nonemployee director
               stock option plan by an additional 500,000 shares and
               increase the size of the initial and annual grants made
               under the plan if Proposal No. 1 is approved; otherwise,
               increase the shares reserved by an additional 300,000
               shares;
     7.        Increase the number of shares of Brooks common stock            In Favor
               reserved for issuance under the 2000 combination stock
               option plan by an additional 5,000,000 shares if Proposal
               No. 1 is approved; otherwise, increase the shares reserved
               by an additional 2,000,000 shares; and
     8.        Consider any other matters that may properly come before the
               annual meeting or any adjournment or postponement of the
               annual meeting.


Q:  WHAT SPECIFIC PROPOSALS ARE PRI STOCKHOLDERS BEING ASKED TO CONSIDER?

A:  PRI stockholders are being asked to approve:

        - the adoption of the merger agreement and the merger;

        - the grant to PRI's management of the discretionary authority to
          adjourn the special meeting to a date or dates not later than June 7,
          2002, if necessary to enable PRI's management to solicit additional
          proxies in favor of the merger proposal; and

        - an amendment to PRI's 2000 employee stock purchase plan that increased
          the maximum number of shares of PRI common stock that may be issued
          under the plan from 350,000 to 850,000.

Q:  WHAT VOTE IS REQUIRED TO APPROVE THE PROPOSALS? WHAT IF I DON'T VOTE?

A:  Brooks stockholders:  Assuming a quorum is present, approval of the issuance
    of Brooks common stock in the merger, the adjournment proposal, and approval
    of the amendments to the stock purchase and option plans will require the
    affirmative vote of the holders of a majority of the shares of Brooks common
    stock present in person or represented by proxy at the annual meeting and
    entitled to vote.

    Approval of the proposal to amend Brooks' certificate of incorporation will
    require the affirmative vote of the holders of a majority of all outstanding
    shares of Brooks common stock. The directors will be elected by a plurality
    of votes properly cast at the annual meeting.

    Abstentions will have no effect on the outcome of the vote for the election
    of directors, but will have the same effect as votes cast against the other
    proposals, even though the stockholder so abstaining intends a different
    interpretation.

    If you do not instruct your broker how to vote, your broker nonvote will
    have the same effect as a vote cast against the proposal to amend Brooks'
    certificate of incorporation but will have no effect on the election of
    directors or the other proposals.

    The Brooks board of directors unanimously recommends that Brooks
    stockholders vote FOR the issuance of the shares of Brooks common stock in
    connection with the merger, FOR the election of five directors to Brooks'
    board and FOR all of the other proposals contained in the notice of meeting.

    PRI stockholders:  Assuming a quorum is present, the merger proposal
    requires the affirmative vote of the holders of a majority of the
    outstanding shares of PRI common stock (including the PRI Canada
    exchangeable shares) outstanding on the record date. If you abstain or your
    broker does not

                                        3

vote your shares, that abstention or broker nonvote will have the same effect
as a vote against the merger proposal. The adjournment proposal and the proposal
to amend PRI's 2000 employee stock purchase plan each require a majority of the
votes properly cast on the proposals at the special meeting. If you abstain or
your broker does not vote your shares, your abstention or broker nonvote will
not affect the outcome of the vote on these proposals.

The PRI board of directors unanimously recommends that its stockholders vote FOR
the merger proposal, FOR the adjournment proposal and FOR the proposal to amend
PRI's 2000 employee stock purchase plan.

Q:  HAVE ANY STOCKHOLDERS OF BROOKS OR PRI AGREED TO VOTE IN FAVOR OF THE
    MERGER?

A:  Yes. Certain directors and executive officers of PRI, who collectively hold,
    as of March 31, 2002, approximately 4.7% of the PRI common stock outstanding
    on that date, have each agreed to vote in favor of the merger. The directors
    and executive officers of Brooks, who collectively hold, as of March 31,
    2002, approximately 5.4% of the Brooks common stock outstanding on that
    date, have each agreed to vote in favor of the merger. Brooks is party to a
    stockholder agreement with Robert J. Therrien, M+W Zander Holding Gmbh and
    Jenoptik AG under which M+W agreed to vote all its shares of Brooks common
    stock on all matters in accordance with the recommendation of a majority of
    the Brooks board of directors. Giving effect to this stockholder agreement
    and the agreements by the directors and executive officers of Brooks, as of
    March 31, 2002, holders of an aggregate total of approximately 9.3% of
    Brooks common stock have agreed to vote in favor of the merger. See "Related
    Agreements -- Voting Agreements" and "Certain Relationships and Related
    Transactions of Brooks -- Jenoptik Stockholder Agreement."

Q:  DO THE DIRECTORS AND EXECUTIVE OFFICERS OF PRI HAVE ANY INTERESTS IN THE
    MERGER THAT ARE DIFFERENT FROM THOSE OF THE PRI STOCKHOLDERS?

A:  Yes. For example:

        - concurrently with the execution of the merger agreement, Mitchell G.
          Tyson, PRI's president and chief executive officer and a member of its
          board of directors, entered into an employment agreement with Brooks
          under which he will be employed by Brooks after the completion of the
          merger and will be entitled to receive payments and other benefits;

        - under the terms of the merger agreement, Brooks will increase the size
          of its board of directors and appoint Mr. Tyson and Kenneth M.
          Thompson, a current member of PRI's board of directors, to the board
          of directors of Brooks;

        - Mordechai Wiesler, PRI's chairman of the board, has an employment
          agreement under which he will be entitled to a severance payment of
          $100,000, acceleration of his options, and other benefits as a result
          of the merger;

        - all officers and numerous other employees of PRI have retention
          agreements under which they will be entitled to severance payments if
          Brooks does not offer them employment after the merger at a comparable
          salary. These officers and employees will also be entitled to
          accelerated vesting of all of their outstanding options, including the
          PRI options assumed by Brooks in the merger, if Brooks does not offer
          them employment after the merger at a comparable salary, or if Brooks
          offers them such employment and they remain in their new positions for
          one year after the merger; and

        - under the merger agreement, Brooks has agreed to maintain all rights
          to indemnification now existing in favor of the current and former
          directors and officers of PRI and its subsidiaries against liabilities
          arising out of any such person's service as a director or officer of
          PRI before the merger.

     As a result, these directors and officers may be more likely to recommend
adoption of the merger agreement than PRI stockholders generally. See "The
Merger -- Interests of PRI's Management in the Merger and Potential Conflicts of
Interest."

                                        4


Q:  DO THE DIRECTORS AND EXECUTIVE OFFICERS OF BROOKS HAVE ANY INTERESTS IN THE
    MERGER THAT ARE DIFFERENT FROM THOSE OF THE BROOKS STOCKHOLDERS?

A:  Yes. For example:

        - Robert J. Therrien, Brooks' president and a member of its board of
          directors, entered into an employment agreement with Brooks effective
          as of October 1, 2001 that provides that Mr. Therrien will receive
          more favorable salary and supplemental retirement benefits if the
          merger with PRI is completed; and

        - Brooks has approved a new, more favorable compensation package for its
          nonemployee directors if the merger with PRI is completed.

    As a result, these directors and officers may be more likely to recommend
    adoption of the merger agreement than Brooks stockholders generally. See
    "The Merger -- Interests of PRI's Management in the Merger and Potential
    Conflicts of Interest."

Q:  WHAT DO I NEED TO DO NOW?

A:  After carefully reading and considering the information in this joint proxy
    statement/prospectus, please indicate on your proxy card how you want to
    vote. Then sign and mail the proxy card in the enclosed postage-paid return
    envelope as soon as possible, so that your shares will be voted in
    accordance with your instructions at your stockholder meeting. You may also
    attend your stockholder meeting in person instead of submitting a proxy. If
    you are a Brooks stockholder, you may also grant your proxy by telephone or
    over the Internet.

Q:  WHAT IF MY SHARES ARE HELD IN STREET NAME BY MY BROKER? WILL MY BROKER VOTE
    FOR ME?

A:  In general, your broker will vote your shares only if you provide
    instructions on how to vote. You should follow the directions provided by
    your broker regarding how to instruct your broker to vote your shares.
    Without instructions, your shares may not be voted.

Q:  WHAT CONSTITUTES A QUORUM AT THE STOCKHOLDERS' MEETINGS?

A:  For Brooks, a quorum is a majority of the outstanding shares entitled to
    vote which are present or represented by proxy at the annual meeting. For
    PRI, a quorum consists of a majority in interest of all stock issued and
    outstanding and entitled to vote at the special meeting. A quorum must exist
    for the transaction of business at the stockholders' meetings. If you submit
    a properly executed proxy card, even if you abstain from voting, your shares
    will be considered part of the quorum. Broker nonvotes, which are shares
    held by a broker or nominee that are represented at the stockholders'
    meeting, but with respect to which the broker or nominee is not empowered to
    vote on a proposal, are also included in determining the presence of a
    quorum.

Q:  CAN I CHANGE MY VOTE AFTER I'VE RETURNED MY PROXY?

A:  Yes. If you are a record holder of common stock, you may change your vote:

        - by writing to the corporate secretary of Brooks or corporate clerk of
          PRI, as the case may be, before your company's stockholder meeting
          stating that you are revoking your proxy;

        - by signing a later-dated proxy card and returning it by mail or, if
          you are a Brooks stockholder, by voting again by telephone or via the
          Internet, in each case before your company's stockholder meeting; or

        - by attending the meeting of stockholders and voting in person. Merely
          attending the meeting, without voting in person, will not revoke any
          proxy previously delivered by you.

     If your shares are held in an account at a brokerage firm or a bank, you
     should contact your brokerage firm or bank to change your vote.

                                        5


Q:  WHEN DO YOU EXPECT THE MERGER TO BE COMPLETED?

A:  We are working to complete the merger in May 2002. However, the merger is
    subject to various conditions and we cannot predict the exact timing.

Q:  SHOULD BROOKS STOCKHOLDERS SEND IN THEIR STOCK CERTIFICATES?

A:  No. Brooks stockholders will continue to own their shares of Brooks common
    stock after the merger and should continue to hold their stock certificates.

Q:  SHOULD PRI STOCKHOLDERS SEND IN THEIR STOCK CERTIFICATES NOW?

A:  No. After we complete the merger, Brooks will send instructions to PRI
    stockholders explaining how to exchange their certificates for PRI common
    stock for certificates for the appropriate number of shares of Brooks common
    stock.

Q:  WHAT WILL HAPPEN TO BROOKS OPTIONS HELD BY EMPLOYEES OF BROOKS?

A:  The merger will not affect outstanding options to purchase Brooks common
    stock held by employees of Brooks.

Q:  WHAT WILL HAPPEN TO PRI OPTIONS HELD BY EMPLOYEES AND DIRECTORS OF PRI?

A:  All outstanding options to purchase PRI common stock held by employees and
    directors of PRI will be assumed by Brooks. Each option will remain subject
    to the same terms and conditions set forth in PRI's stock option plans. Each
    option will be exercisable for the number of shares of Brooks common stock
    that is equal to the number of shares of PRI common stock subject to the
    options immediately prior to the merger, multiplied by 0.52. The exercise
    price of each assumed option will be correspondingly adjusted by dividing it
    by 0.52.

Q:  WHAT WILL HAPPEN TO PRI CANADA EXCHANGEABLE SHARES?

A:  At the effective time of the merger, each outstanding PRI Canada
    exchangeable share will automatically become exchangeable for 0.52 shares of
    Brooks common stock. See "Material Canadian Federal Income Tax
    Consequences." The holders of PRI Canada exchangeable shares are not
    entitled to a separate class vote on the merger proposal. In addition, the
    PRI special voting share will be converted automatically into a Brooks
    special voting share carrying a number of votes at meetings of Brooks
    stockholders equal to the number of outstanding PRI Canada exchangeable
    shares (other than those held by Brooks or any of its subsidiaries)
    multiplied by 0.52.

    The PRI Canada exchangeable shares are currently listed on the Toronto Stock
    Exchange. The Toronto Stock Exchange has conditionally approved the
    continued listing of such shares following the merger, subject to compliance
    with the filing and other requirements of such exchange. There is currently
    no established market in the U.S. for the exchangeable shares.

    Upon the effectiveness of the merger, the name of PRI Canada will be changed
    to "Brooks-PRI Automation (Canada), Inc." Registered holders of PRI Canada
    exchangeable shares will be sent a letter of transmittal following
    completion of the merger for the purpose of exchanging their existing
    exchangeable share certificates for replacement share certificates
    evidencing the same number of exchangeable shares of Brooks-PRI Automation
    (Canada), Inc.

Q:  WHO CAN ANSWER QUESTIONS?

A:  If you have additional questions about the merger or about the solicitation
    of your proxy, you should contact:


                                    
       Brooks Automation, Inc.                  PRI Automation, Inc.
          Investor Relations                     Investor Relations
          15 Elizabeth Drive                   805 Middlesex Turnpike
   Chelmsford, Massachusetts 01824         Billerica, Massachusetts 01821
        Phone: (978) 262-5799                  Phone: (978) 670-4270


                                        6


                                    SUMMARY

     This summary highlights selected information from this joint proxy
statement/prospectus. It may not contain all of the information that is
important to you. To better understand the merger, we urge you to read carefully
this entire joint proxy statement/prospectus and the documents we refer to in
this joint proxy statement/prospectus. Please see "Where You Can Find More
Information" on page 156. We have included page references directing you to a
more complete description of each item presented in this summary. In this joint
proxy statement/prospectus, we often refer to the "combined company," which
means, following the merger, Brooks and its subsidiaries.

     This summary includes a discussion of the material provisions of the merger
agreement. A copy of the merger agreement is attached to this joint proxy
statement/prospectus as Appendix A. We urge you to read carefully the entire
merger agreement because it is the primary legal document that governs the
merger.

THE COMPANIES

  BROOKS AUTOMATION, INC.

     Brooks is a leading supplier of integrated factory automation solutions for
global semiconductor manufacturing and related industries. Brooks has
distinguished itself as a technology and market leader, particularly in the
demanding cluster-tool vacuum-processing environment and in integrated factory
automation software applications. Brooks' automation solutions are designed to
optimize equipment and factory productivity. These solutions include tool
automation modules, complete semiconductor wafer handing systems, factory
interface solutions and automation software and integration services. Brooks is
a Delaware corporation and was incorporated in 1989. Brooks' principal offices
are located at 15 Elizabeth Drive, Chelmsford, Massachusetts 01824 and its
telephone number is (978) 262-2400. Brooks' corporate website is www.brooks.com.
The information on Brooks website is not incorporated by reference in this joint
proxy statement/prospectus.

  PRI AUTOMATION, INC.

     PRI Automation, Inc. is a leading global supplier of advanced automation
systems, software and services for the semiconductor industry. PRI offers
complete and flexible solutions that address a wide range of automation
requirements for semiconductor manufacturers and for OEM manufacturers of
semiconductor process tools. PRI's key product areas are factory automation
systems, tool automation systems, software products, and automation services and
support. PRI's products support industry standards and provide customers with
the option of purchasing PRI's integrated factory automation solutions or
incorporating elements of PRI's systems into the customer's existing automation
infrastructure. PRI is a Massachusetts corporation and has been in the
semiconductor manufacturing automation industry since 1982. PRI's principal
offices are located at 805 Middlesex Turnpike, Billerica, Massachusetts 01821
and its telephone number is (978) 670-4270. PRI's corporate website is
www.pria.com. The information on PRI's website is not incorporated by reference
to this joint proxy statement/prospectus.

THE MERGER (SEE PAGE 45)

     Brooks and PRI have entered into a merger agreement that provides for the
merger of Pontiac Acquisition Corp., a Massachusetts corporation and a wholly
owned subsidiary of Brooks, with and into PRI. Immediately following that
merger, PRI will be merged with and into Brooks. Brooks will be the sole
surviving company following the merger. Each share of PRI common stock, except
for dissenting shares, will automatically be converted into 0.52 shares of
Brooks common stock. This exchange ratio was determined based on arms' length
negotiation between Brooks and PRI. Following the merger, the current
stockholders of Brooks will own 60% of the outstanding common stock of the
combined company and the current stockholders of PRI will own 40% of the
outstanding common stock of the combined company, based on the numbers of
outstanding shares of common stock of Brooks and PRI on March 31, 2002.

                                        7


     The Brooks common stock that holders of PRI common stock will receive as a
result of the merger is traded and quoted on The Nasdaq National Market under
the symbol "BRKS." Following the completion of the merger, the name of the
combined company will be changed to Brooks-PRI Automation, Inc., and the common
stock of the combined company will trade under the symbol "BRKS."

OPINIONS OF FINANCIAL ADVISORS (SEE PAGES 55 AND 65)

  OPINION OF BROOKS' FINANCIAL ADVISOR

     In connection with the proposed merger, Brooks' financial advisor, Credit
Suisse First Boston Corporation, delivered an oral opinion, subsequently
confirmed in writing, to the Brooks board of directors as to the fairness, from
a financial point of view, of the exchange ratio provided for in the merger. The
full text of Credit Suisse First Boston's written opinion, dated October 23,
2001, is attached to this joint proxy statement/prospectus as Appendix E. We
encourage you to read this opinion carefully in its entirety for a description
of the procedures followed, assumptions made, matters considered and limitations
on the review undertaken. CREDIT SUISSE FIRST BOSTON'S OPINION IS ADDRESSED TO
THE BROOKS BOARD OF DIRECTORS AND DOES NOT CONSTITUTE A RECOMMENDATION TO ANY
STOCKHOLDER AS TO ANY MATTER RELATING TO THE MERGER.

  OPINION OF PRI'S FINANCIAL ADVISOR

     In connection with the proposed merger, PRI's financial advisor, Morgan
Stanley & Co. Incorporated, delivered an oral opinion, subsequently confirmed in
writing, to the PRI board of directors as to the fairness, from a financial
point of view, of the exchange ratio pursuant to the merger agreement, based
upon and subject to the various considerations described in the opinion. The
full text of Morgan Stanley's written opinion, dated October 23, 2001, is
attached to this joint proxy statement/prospectus as Appendix F. We encourage
you to read this opinion carefully in its entirety for a description of the
procedures followed, assumptions made, matters considered and limitations on the
review undertaken. MORGAN STANLEY'S OPINION IS ADDRESSED TO THE PRI BOARD OF
DIRECTORS AND DOES NOT CONSTITUTE A RECOMMENDATION TO ANY STOCKHOLDER AS TO ANY
MATTER RELATING TO THE MERGER.

CONDITIONS TO COMPLETION OF THE MERGER (SEE PAGE 89)

     The completion of the merger depends upon the satisfaction of a number of
conditions, including:

     - approval of the merger and the other transactions contemplated by the
       merger agreement by the stockholders of Brooks and PRI;

     - the receipt of any necessary clearance for the merger under the
       Hart-Scott-Rodino Antitrust Improvements Act of 1976 and from any
       applicable foreign competition authorities;

     - no material adverse change involving Brooks or PRI;

     - approval for quotation on the Nasdaq National Market of the shares of
       Brooks common stock to be issued in the merger;

     - receipt by each of Brooks and PRI of an opinion of counsel to the effect
       that the transaction will be treated as a tax-free reorganization under
       the Internal Revenue Code; and

     - other customary contractual conditions specified in the merger agreement.

     If the law permits, any condition to the merger may be waived. The law does
not permit Brooks or PRI to waive conditions relating to stockholder approval,
injunctions, court orders or the receipt of necessary clearance under the
Hart-Scott-Rodino Antitrust Improvements Act or from any applicable foreign
competition authorities.

TERMINATION OF THE MERGER AGREEMENT (SEE PAGE 90)

     Brooks and PRI can agree to terminate the merger agreement at any time
before completing the merger. Also, either of Brooks or PRI can decide, without
the other's consent, but subject to limitations,

                                        8


to terminate the merger agreement if the merger has not been completed on or
before July 31, 2002, or if the other company has breached its obligations under
the merger agreement, or for other reasons described under the heading "The
Merger Agreement -- Termination of the Merger Agreement."

TERMINATION FEE (SEE PAGE 86)

     If the merger is not completed because Brooks exercises its right to
terminate the merger agreement, under circumstances described under the heading
"The Merger Agreement -- Fees and Expenses," PRI will be required to pay Brooks
a termination fee of $14.0 million, plus the reasonable out-of-pocket expenses
of Brooks incurred since October 1, 2001 in connection with this transaction.

RESTRICTIONS ON SOLICITING ALTERNATIVE TRANSACTIONS (SEE PAGE 85)

     PRI has agreed that it will not initiate or engage in any discussion
regarding a prospective business combination of PRI with any party other than
Brooks. PRI has further agreed to cause each of its officers, directors,
employees, representatives and agents not to initiate or engage in these
discussions. There are limited exceptions to these prohibitions that enable
PRI's board to fulfill its fiduciary duties to PRI's stockholders.

CONDUCT OF BROOKS AND PRI BEFORE THE MERGER (SEE PAGE 83)

     Brooks and PRI have each agreed that they and their subsidiaries will carry
on their business in the usual, regular and ordinary course. Each has also
agreed to use all reasonable efforts to preserve its current business
organizations, keep available the services of its current officers and other key
employees, and preserve its relationships with those persons having business
dealings with them. Brooks and PRI have also each agreed that until the earlier
of the closing of the merger or the termination of the merger agreement, or
unless the other company consents in writing and as contemplated by the merger
agreement, it and each of its subsidiaries will conduct its business in
compliance with specific restrictions.

GOVERNMENTAL APPROVALS AND REGULATORY REQUIREMENTS (SEE PAGE 77)

  U.S. TERRITORIES

     Other than compliance with applicable federal and state securities laws in
connection with the issuance of Brooks common stock pursuant to the merger and
the solicitation of proxies for the two stockholders' meetings, compliance with
the Hart-Scott-Rodino Antitrust Improvements Act of 1976, and compliance with
applicable provisions of the Delaware General Corporation Law and the
Massachusetts Business Corporation Law, no United States federal or state
regulations must be complied with in order to complete the merger.

  FOREIGN TERRITORIES

     Brooks and PRI anticipate that they will not be required to make filings
with, or receive the approval of antitrust authorities in, any foreign
jurisdictions.

ACCOUNTING TREATMENT OF THE MERGER (SEE PAGE 78)

     Brooks will account for the merger using the purchase method of accounting
in accordance with Statement of Financial Accounting Standards No. 141,
"Business Combinations." As such, the assets acquired and liabilities assumed
from PRI will be recorded at their fair values as of the date of the merger. Any
excess of the purchase price over the fair value of the net tangible assets and
identifiable intangible assets acquired will be recorded as goodwill. The
results of operations of PRI will be included in Brooks' results of operations
from the date of the closing of the merger.

                                        9


RESTRICTIONS ON THE ABILITY TO SELL BROOKS STOCK BY AFFILIATES OF BROOKS AND PRI
(SEE PAGE 79)

     All shares of Brooks common stock that PRI stockholders receive in
connection with the merger will be freely transferable unless the holder is
considered an "affiliate" of either Brooks or PRI for purposes of the Securities
Act of 1933. Shares of Brooks common stock held by affiliates may be sold only
pursuant to an effective registration statement covering the resale of the
shares, or an exemption under the Securities Act.

COMPARISON OF STOCKHOLDERS RIGHTS (SEE PAGE 102)

     PRI is a Massachusetts corporation and the rights of PRI stockholders are
currently governed by Massachusetts law. Brooks is a Delaware corporation. After
the merger, PRI stockholders will hold shares of Brooks common stock and their
rights as stockholders of Brooks will be governed by Delaware law and Brooks'
charter and bylaws, which are different from PRI's charter and bylaws.

DIVIDEND INFORMATION (SEE PAGE 94)

     Other than dividends paid by one of Brooks' subsidiaries prior to Brooks'
acquisition of that subsidiary, Brooks and PRI have never declared or paid cash
dividends on their common stock since their formation. Brooks and PRI currently
do not intend to pay dividends on their common stock in the foreseeable future
so that they may reinvest any earnings in their businesses. The payment of
dividends, if any, in the future will be at the discretion of Brooks' board of
directors and PRI's board of directors, as the case may be.

COMPARATIVE PER SHARE MARKET INFORMATION (SEE PAGE 94)

     The Brooks common stock is traded on the Nasdaq National Market under the
symbol "BRKS." The PRI common stock is traded on the Nasdaq National Market
under the symbol "PRIA."

     The following table presents the closing prices per share of the Brooks
common stock and the closing prices per share of the PRI common stock on October
23, 2001, the last trading day before our public announcement of the merger, and
April 8, 2002, the latest practicable date before the mailing of this joint
proxy statement/prospectus.

     The table also presents the equivalent price per share of PRI common stock.
The equivalent price per share is equal to the closing price of one share of
Brooks common stock on the applicable date, multiplied by 0.52, the number of
shares of Brooks common stock to be issued in exchange for each share of PRI
common stock.



                                                            OCTOBER 23, 2001   APRIL 8, 2002
                                                            ----------------   -------------
                                                                         
Brooks....................................................       $33.11           $37.40
PRI.......................................................       $12.54           $19.39
Equivalent PRI per share price............................       $17.22           $19.45


     You should obtain current stock price quotations for the Brooks common
stock and the PRI common stock.

                          BROOKS' RECENT DEVELOPMENTS

     On March 21, 2002, Brooks signed a non-binding letter of intent relating to
a business combination with a company that is an automation supplier to the
semiconductor manufacturing industry. The letter of intent provides that upon
consummation of the proposed combination Brooks will pay approximately $37.0
million in the form of shares of Brooks common stock and approximately $4.0
million in cash. The business combination is subject to the completion of
substantial due diligence, the negotiation and resolution of significant
business and legal issues and the negotiation and completion of a mutually
satisfactory agreement among the parties. Brooks cannot guarantee that this
transaction will be completed on acceptable terms, or be completed at all.

                                        10


             BROOKS SELECTED HISTORICAL CONSOLIDATED FINANCIAL DATA

     The following selected consolidated financial data should be read in
conjunction with "Management's Discussion and Analysis of Financial Condition
and Results of Operations" and the consolidated financial statements of Brooks
and related notes thereto included in Brooks' annual reports, quarterly reports
and other information on file with the SEC. The results of operations data for
each of the two years in the period ended September 30, 1998 and the balance
sheet data as of September 30, 1997, 1998 and 1999 have been derived from
financial statements not incorporated by reference in this joint proxy
statement/ prospectus. The results of operations data for the three months ended
December 31, 2000 and 2001 and the balance sheet data as of December 31, 2001
have been derived from unaudited financial statements incorporated by reference
in this joint proxy statement/prospectus. The selected financial data as of
December 31, 2001 and for the three months ended December 31, 2000 and 2001 are
derived from Brooks' unaudited consolidated financial statements, which in the
opinion of Brooks' management, reflect all adjustments (consisting of only
normal recurring adjustments) necessary for a fair presentation of the financial
position and results of operations for these periods. The results of operations
data for each of the three years in the period ended September 30, 2001 and the
balance sheet data as of September 30, 2000 and 2001, have been derived from
audited financial statements incorporated by reference in this joint proxy
statement/prospectus.

     Brooks acquired the following in transactions accounted for using the
purchase method of accounting:

     - Hanyon Technology, Inc. (acquired April 21, 1999);

     - Domain Manufacturing Corporation (acquired June 30, 1999);

     - the Infab Division of Jenoptik AG (acquired September 30, 1999);

     - Auto-Soft Corporation and AutoSimulations, Inc. (acquired January 6,
       2000);

     - MiTeX Solutions (acquired June 23, 2000);

     - SEMY Engineering, Inc. (acquired February 16, 2001);

     - SimCon N.V. (acquired May 15, 2001);

     - CCS Technology, Inc. (acquired June 25, 2001);

     - the KLA e-Diagnostics product business (acquired June 26, 2001);

     - General Precision, Inc. (acquired October 5, 2001);

     - Tec-Sem A.G. (acquired October 9, 2001);

     - Automation Systems Group of Zygo Corporation (acquired December 13,
       2001), and

     - Fab Air Controls, Inc. (acquired December 15, 2001).

                                        11


     The results of operations of each of these acquisitions are included in
Brooks' results from their date of acquisition.



                                                                                      THREE MONTHS ENDED
                                             YEAR ENDED SEPTEMBER 30,                    DECEMBER 31,
                               ----------------------------------------------------   -------------------
                                 1997       1998       1999       2000       2001       2000       2001
                               --------   --------   --------   --------   --------   --------   --------
                                      (IN THOUSANDS, EXCEPT PER SHARE DATA)
                                                                            
STATEMENT OF OPERATIONS DATA
Revenues.....................  $133,827   $123,459   $122,957   $337,184   $381,716   $111,391   $ 61,455
Gross profit.................  $ 56,739   $ 37,280   $ 55,152   $160,725   $152,384   $ 50,619   $ 24,114
Income (loss) from
  operations.................  $ (1,362)  $(29,190)  $(11,822)  $ 20,084   $(43,904)  $  7,577   $(12,658)
Income (loss) before income
  taxes and minority
  interests..................  $ (2,857)  $(27,917)  $(10,448)  $ 28,444   $(36,523)  $ 10,486   $(11,859)
Net income (loss)............  $ (3,324)  $(23,268)  $ (9,534)  $ 15,109   $(29,660)  $  5,515   $ (7,734)
Accretion and dividends on
  preferred stock............  $  1,125   $  1,540   $    774   $    120   $     90   $     30   $     --
Net income (loss)
  attributable to common
  stockholders...............  $ (4,449)  $(24,808)  $(10,308)  $ 14,989   $(29,750)  $  5,485   $ (7,734)
Basic earnings (loss) per
  share......................  $  (0.54)  $  (2.32)  $  (0.89)  $   0.96   $  (1.65)  $   0.31   $  (0.39)
Diluted earnings (loss) per
  share......................  $  (0.54)  $  (2.32)  $  (0.89)  $   0.88   $  (1.65)  $   0.30   $  (0.39)
Shares used in computing
  basic earnings (loss) per
  share......................     8,230     10,687     11,542     15,661     18,015     17,592     19,886
Shares used in computing
  diluted earnings (loss) per
  share......................     8,230     10,687     11,542     17,192     18,015     18,391     19,886

SUPPLEMENTAL DATA
Depreciation and
  amortization...............  $  7,237   $  9,631   $ 11,766   $ 30,400   $ 45,041   $  8,823   $  7,486
Capital expenditures.........  $  8,131   $  4,725   $  6,100   $ 13,879   $ 53,652   $  5,120   $  4,485




                                                                                                AS OF
                                                      AS OF SEPTEMBER 30,                    DECEMBER 31,
                                      ----------------------------------------------------   ------------
                                        1997       1998       1999       2000       2001         2001
                                      --------   --------   --------   --------   --------   ------------
                                                         (IN THOUSANDS)
                                                                           
BALANCE SHEET DATA
Cash, cash equivalents and
  marketable securities.............  $ 77,642   $ 70,265   $ 67,031   $236,670   $329,719     $302,638
Total assets........................  $181,967   $160,143   $197,300   $519,786   $703,831     $730,400
Working capital.....................  $120,067   $105,210   $106,803   $306,836   $288,036     $245,307
Notes payable and revolving credit
  facilities........................  $  4,070   $  4,717   $  6,183   $ 16,350   $ 17,122     $ 19,249
Current portion of long-term debt
  and capital lease obligations.....  $  1,379   $    523   $    544   $    524   $    392     $     79
Convertible subordinated notes......  $     --   $     --   $     --   $     --   $175,000     $175,000
Long-term debt and capital lease
  obligations (less current portion)
  and senior subordinated note......  $  6,264   $  9,118   $  6,732   $    332   $     31     $    564
Redeemable convertible preferred
  stock.............................  $ 15,270   $  5,923   $  2,481   $  2,601   $     --     $     --
Members' capital....................  $    195   $  1,134   $    930   $     --   $     --     $     --
Stockholders' equity................  $127,722   $115,794   $137,913   $415,284   $424,169     $443,014


                                        12


              PRI SELECTED HISTORICAL CONSOLIDATED FINANCIAL DATA

     The following selected consolidated financial data should be read in
conjunction with "Management's Discussion and Analysis of Financial Condition
and Results of Operations" and the consolidated financial statements of PRI and
related notes thereto included in PRI's annual reports, quarterly reports and
other information on file with the SEC. The results of operations data for each
of the two years in the period ended September 30, 1998 and the balance sheet
data as of September 30, 1997, 1998 and 1999 have been derived from financial
statements not incorporated by reference in this joint proxy
statement/prospectus. The results of operations data for the three months ended
December 31, 2000 and December 30, 2001 and the balance sheet data as of
December 30, 2001 have been derived from unaudited financial statements
incorporated by reference in this joint proxy statement/prospectus. The selected
financial data as of December 30, 2001 and for the three months ended December
31, 2000 and December 30, 2001 are derived from PRI's unaudited consolidated
financial statements, which in the opinion of PRI's management, reflect all
adjustments (consisting of only normal recurring adjustments) necessary for a
fair presentation of the financial position and results of operations for these
periods. The results of operations data for each of the three years in the
period ended September 30, 2001 and the balance sheet data as of September 30,
2000 and 2001, have been derived from audited financial statements incorporated
by reference in this joint proxy statement/prospectus.

     PRI incurred special charges of $32,495,000, $6,375,000, $25,337,000, and
$41,417,000 for fiscal years 1998, 1999, 2000 and 2001, respectively. For the
year ended September 30, 1998, special charges consisted of $13,987,000 charged
to cost of revenue for inventory and warranty provisions, and $18,508,000
charged to operating expenses for acquisition related expenses and other charges
incurred in consolidating PRI's business unit structure.

     For the year ended September 30, 2001, PRI recorded a non-cash charge of
$5,748,000, net of tax, or $0.23 per diluted share, to reflect the cumulative
effect of an accounting change as of October 1, 2000, related to the adoption of
SEC Staff Accounting Bulletin No. 101, "Revenue Recognition in Financial
Statements. Pro forma amounts for prior years have not been presented to reflect
the change in accounting principle under SAB 101, primarily as a result of
certain inherent limitations in PRI's information systems. PRI's information
systems were not designed to track and accumulate the type of information
required to fully evaluate and apply the impact of SAB 101, and as such, the
process for fiscal year 2001 was largely a manual exercise. As a result, PRI did
not believe it could determine the amounts for periods prior to fiscal 2001.

     For the year ended September 30, 1999, PRI established a full valuation
allowance against its net deferred tax assets.



                                                                                          THREE MONTHS ENDED
                                             YEAR ENDED SEPTEMBER 30,                 ---------------------------
                               ----------------------------------------------------   DECEMBER 31,   DECEMBER 30,
                                 1997       1998       1999       2000       2001         2000           2001
                               --------   --------   --------   --------   --------   ------------   ------------
                                      (IN THOUSANDS, EXCEPT PER SHARE DATA)
                                                                                
OPERATING RESULTS:
Net revenue..................  $236,100   $203,545   $136,296   $299,772   $268,558     $ 84,704       $ 54,893
Gross profit.................   115,128     78,790     52,542     95,173     35,330       26,051         12,705
Operating income (loss)......    35,316    (31,014)   (37,955)    (9,280)   (94,558)      (3,162)        (6,915)
Income (loss) before
  cumulative effect of change
  in accounting principle....    27,497    (22,623)   (36,085)    (7,953)   (93,296)      (4,008)        (6,754)
Cumulative effect of change
  in accounting principle,
  net of tax.................        --         --         --         --     (5,748)      (5,748)            --
Net income (loss)............  $ 27,497   $(22,623)  $(36,085)  $ (7,953)  $(99,044)    $ (9,756)      $ (6,754)
Net income (loss) per common
  share:
  Basic......................  $   1.35   $  (1.08)  $  (1.67)  $  (0.34)  $  (3.92)    $  (0.39)      $  (0.26)
  Diluted....................  $   1.27   $  (1.08)  $  (1.67)  $  (0.34)  $  (3.92)    $  (0.39)      $  (0.26)




                                                                                                     AS OF
                                                         AS OF SEPTEMBER 30,                      DECEMBER 30,
                                         ----------------------------------------------------     ------------
                                           1997       1998       1999       2000       2001           2001
                                         --------   --------   --------   --------   --------     ------------
                                                                                
BALANCE SHEET DATA:
Total assets...........................  $195,315   $167,478   $146,552   $276,924   $218,955       $208,090


                                        13


         SUMMARY UNAUDITED PRO FORMA COMBINED CONDENSED FINANCIAL DATA

     The following tables show summary unaudited pro forma financial information
as if Brooks, General Precision, Inc., or GPI, and PRI had been combined as of
the beginning of the period for statement of operations purposes and as if
Brooks and PRI had been combined as of December 31, 2001 for balance sheet
purposes. On October 5, 2001, Brooks acquired certain of the assets of GPI, in
exchange for 850,000 shares of Brooks common stock, with a market value of
approximately $26.2 million at the time of issuance, subject to post-closing
adjustments. GPI, located in Valencia, California, is a supplier of high-end
environmental solutions for the semiconductor industry. The acquisition of GPI
was accounted for as a purchase of assets. The consolidated balance sheet of
Brooks at December 31, 2001 includes the assets acquired and liabilities assumed
of GPI. The results of operations of GPI for the period subsequent to October 5,
2001 are included within the unaudited historic consolidated statement of
operations data of Brooks.

     The summary unaudited pro forma combined financial data are derived from
the unaudited pro forma combined financial statements, which give effect to
Brooks' acquisition of GPI in October 2001 and the proposed merger of Brooks and
PRI using the purchase method of accounting and should be read in conjunction
with the unaudited pro forma combined financial statements and the notes thereto
included in this joint proxy statement/prospectus. The unaudited pro forma
combined financial data are based on estimates and assumptions, which are
preliminary and have been made solely for purposes of developing such pro forma
information. The estimated pro forma adjustments arising from the acquisitions
of PRI and GPI are derived from the estimates of purchase price paid and
estimated fair values of the assets acquired and liabilities assumed. The final
determination of purchase price, fair value and resulting goodwill may differ
significantly from that reflected in the pro forma statement of operations and
balance sheet. The pro forma data are presented for illustrative purposes only
and are not necessarily indicative of the operating results or financial
position that would have occurred if each transaction had been consummated as of
October 1, 2000 for statement of operations or December 31, 2001, for financial
position respectively, nor are the data necessarily indicative of future
operating results or financial position. The unaudited pro forma combined
financial data should be read in conjunction with the historical consolidated
financial statements of Brooks and PRI and related notes thereto, and
"Management's Discussion and Analysis of Financial Condition and Results of
Operations" of Brooks and PRI contained in their respective annual reports and
quarterly reports and other information Brooks and PRI have filed with the SEC,
and the audited financial statements of GPI included in Brooks' current report
on Form 8-K/A filed on April 4, 2002.

     The fiscal year end of GPI was December 31. The pro forma statement of
operations for the year ended September 30, 2001 includes the unaudited results
for the fourth quarter of the fiscal year ended December 31, 2000 and the first,
second and third quarters of fiscal 2001 of GPI. PRI's first quarter of fiscal
2002 ended on December 30, 2001. Therefore, the financial data of PRI used to
calculate the pro forma financial information for the three months ended
December 31, 2001 is PRI's unaudited financial data as of and for the quarter
ended December 30, 2001.



                                                        YEAR ENDED          THREE MONTHS ENDED
                                                    SEPTEMBER 30, 2001       DECEMBER 31, 2001
                                                   ---------------------   ---------------------
                                                   (IN THOUSANDS, EXCEPT   (IN THOUSANDS, EXCEPT
                                                      PER SHARE DATA)         PER SHARE DATA)
                                                                     
PRO FORMA COMBINED STATEMENT OF OPERATIONS DATA:
  Revenues.......................................        $ 665,761               $116,348
  Loss from continuing operations................        $(164,910)              $(31,284)
Loss per share from continuing operations:
  Basic..........................................        $   (5.12)              $  (0.94)
  Diluted........................................        $   (5.12)              $  (0.94)
Shares used in computing loss per share from
  continuing operations:
  Basic..........................................           32,215                 33,236
  Diluted........................................           32,215                 33,236


                                        14




                                                              DECEMBER 31, 2001
                                                              ------------------
                                                                (IN THOUSANDS)
                                                           
PRO FORMA COMBINED BALANCE SHEET DATA:
  Total assets..............................................      $1,459,899
  Working capital...........................................      $  300,852
  Notes payable.............................................      $   19,249
  Current portion of long-term debt.........................      $       79
  Convertible subordinated notes............................      $  175,000
  Long-term debt (less current portion and convertible
     subordinated notes)....................................      $      564
  Stockholders' equity......................................      $  946,048


                                        15


                           COMPARATIVE PER SHARE DATA

     The following table reflects (i) the historical loss from continuing
operations and book value per share of Brooks common stock in comparison with
the pro forma loss from continuing operations and book value per share after
giving effect to the acquisition of GPI and to the proposed merger with PRI; and
(ii) the historical loss from continuing operations and book value per share of
PRI common stock in comparison with the equivalent pro forma loss from
continuing operations and book value per share. The equivalent pro forma loss
from continuing operations and book value per share are equal to the pro forma
loss from continuing operations and book value per share of Brooks after giving
effect to the acquisition of GPI and to the proposed merger with PRI, multiplied
by 0.52, the number of shares of Brooks common stock to be issued in exchange
for each share of PRI common stock. You should read this information along with
the selected historical consolidated financial data of Brooks and PRI, and the
unaudited pro forma combined financial data of Brooks, which are included in
this joint proxy statement/prospectus, and the separate financial statements of
Brooks and PRI and the notes thereto included in their respective annual reports
on Form 10-K for fiscal 2001 as filed with the SEC, which are incorporated by
reference in this document. The pro forma combined financial data are not
necessarily indicative of the operating results of future operations or the
actual results that would have occurred had the merger been completed at the
beginning of the period presented.

     The historical book value per common share was calculated by dividing
stockholders' equity by the number of shares of common stock outstanding at
December 31, 2001. Brooks' pro forma combined book value per share was computed
by dividing pro forma stockholders' equity by the pro forma number of shares of
Brooks common stock which would have been outstanding had the merger been
completed as of the balance sheet date.

     Brooks and PRI did not declare or pay cash dividends on their common stock
in the year ended September 30, 2001 or in the quarter ended December 31, 2001.
They do not intend to pay dividends on their common stock in the foreseeable
future. See "Comparative Per Share Market Price and Dividend Data."



                                                                              THREE MONTHS
                                                          YEAR ENDED             ENDED
                                                      SEPTEMBER 30, 2001   DECEMBER 31, 2001
                                                      ------------------   ------------------
                                                                     
BROOKS
Loss from continuing operations per share:
  Historical -- basic and diluted...................        $(1.65)              $(0.39)
  Pro forma (Brooks and GPI only) -- basic and
     diluted........................................        $(1.63)                 N/A
  Pro forma -- basic and diluted....................        $(5.12)              $(0.94)

Book value per share:
  Historical........................................            --               $22.20
  Pro forma.........................................            --               $28.41




                                                                              THREE MONTHS
                                                                                 ENDED
                                                                           DECEMBER 30, 2001
                                                                           ------------------
                                                                     
PRI

Loss from continuing operations per share:
  Historical -- basic and diluted...................        $(3.69)              $(0.26)
  Equivalent pro forma -- basic and diluted.........        $(2.66)              $(0.49)

Book value per share:
  Historical........................................            --               $ 4.18
  Equivalent pro forma..............................            --               $14.77


                                        16


           CAUTIONARY STATEMENT CONCERNING FORWARD-LOOKING STATEMENTS

     This joint proxy statement/prospectus includes and incorporates by
reference "forward-looking statements" within the meaning of Section 27A of the
Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934
with respect to the merger and the financial condition, results of operations,
plans, objectives, future performance and business of Brooks and PRI, which are
usually identified by the use of words such as "will," "may," "anticipates,"
"believes," "estimates," "expects," "projects," "plans," "predicts,"
"continues," "intends," "should," "would," or similar expressions. This joint
proxy statement/prospectus also includes and incorporates by reference
forward-looking statements about:

     - the completion and anticipated timing of the merger;

     - the potential market for the combined company's products;

     - the expected drivers of growth for the market opportunity;

     - the anticipated impact of PRI's technology on Brooks' future growth;

     - the expected benefits and synergies of the merger; and

     - and the anticipated impact of the acquisition on the combined company's
       financial condition and financial performance.

     PRI and Brooks intend for these forward-looking statements to be covered by
the safe harbor provisions for forward-looking statements contained in the
Private Securities Litigation Reform Act of 1995, and are including this
statement for purposes of complying with these safe harbor provisions.

     These forward-looking statements reflect current views and expectations
about the relevant company's plans, strategies and prospects, which are based on
the information currently available and on current assumptions.

     Neither PRI nor Brooks can give any guarantee that these plans, intentions
or expectations will be achieved. Investors are cautioned that all
forward-looking statements involve risks and uncertainties, and actual results
may differ materially from those discussed in the forward-looking statements as
a result of various factors, including those factors described in the "Risk
Factors" section of this joint proxy statement/prospectus. In addition, events
may occur in the future that we are not able to accurately predict or control
and that may cause actual results to differ materially from the expectations
described in the forward-looking statements. Readers should not place undue
reliance on the forward-looking statements included or incorporated by reference
in this joint proxy statement/prospectus. These forward-looking statements speak
only as of the date on which the statements were made. In evaluating forward-
looking statements, you also should consider the other risks described from time
to time in PRI's and Brooks' reports and documents filed with the SEC.

     NEITHER BROOKS NOR PRI ASSUMES ANY OBLIGATION TO UPDATE ANY FORWARD-LOOKING
STATEMENTS TO REFLECT EVENTS OR CIRCUMSTANCES AFTER THE DATE OF THIS JOINT PROXY
STATEMENT/PROSPECTUS.

                                        17


                                  RISK FACTORS

     In addition to the other information included and incorporated by reference
in this joint proxy statement/prospectus, you should carefully read and consider
the following factors in evaluating the proposals relating to the merger to be
voted on at the stockholders meetings.

                          RISKS RELATED TO THE MERGER

FAILURE OF THE MERGER TO ACHIEVE POTENTIAL BENEFITS COULD HARM THE BUSINESS AND
OPERATING RESULTS OF THE COMBINED COMPANY.

     Brooks and PRI expect that the combination of Brooks and PRI will result in
potential benefits for the combined company. The merger will not achieve its
anticipated benefits unless Brooks successfully combines its operations with
those of PRI and integrates the two companies' products in a timely manner.
Integrating Brooks and PRI will be a complex, time consuming and expensive
process and may result in revenue disruption if not completed in a timely and
efficient manner. Until the merger, Brooks and PRI will operate independently,
each with its own business, business culture, customers, employees and systems.
Following the merger, the companies must operate as a combined organization
using common:

     - sales, marketing, service and support organizations;

     - information communication systems;

     - operating procedures;

     - financial controls; and

     - human resource practices, including benefit, training and professional
       development programs.

     There may be substantial difficulties, costs and delays involved in
integrating Brooks and PRI. These could include:

     - distracting management from the business of the combined company;

     - supply chain coordination;

     - problems with compatibility of business cultures;

     - customer perception of an adverse change in service standards, business
       focus, billing practices or product and service offerings;

     - costs and inefficiencies in delivering products and services to the
       customers of the combined company;

     - problems in successfully coordinating the research and development
       efforts of the combined company;

     - integrated sales, support and product marketing;

     - costs and delays in implementing common systems and procedures, including
       financial accounting and enterprise resource planning systems; and

     - the inability to retain and integrate key management, research and
       development, technical sales and customer support personnel.

     Further, we cannot assure you that the combined company will realize any of
the anticipated benefits and synergies of the merger. Any one or all of the
factors identified above could cause increased operating costs, lower than
anticipated financial performance, or the loss of customers, employees or
business partners. The failure to integrate Brooks and PRI successfully will
have a material adverse effect on the business, financial condition and results
of operations of the combined company.

                                        18


UNCERTAINTY REGARDING THE MERGER MAY CAUSE CUSTOMERS, SUPPLIERS AND CHANNEL
PARTNERS TO DELAY OR DEFER DECISIONS CONCERNING BROOKS AND PRI, WHICH MAY
NEGATIVELY AFFECT THEIR RESPECTIVE BUSINESSES.

     The merger will happen only if stated conditions are met, including
approval of the merger by PRI's stockholders, approval of the issuance of shares
in the merger by Brooks' stockholders, clearance of the merger under United
States and foreign antitrust laws, and the absence of any material adverse
change in the business of PRI or Brooks. Many of the conditions are outside the
control of PRI and Brooks, and both parties also have stated rights to terminate
the merger agreement. Accordingly, there may be uncertainty regarding the
completion of the merger. This uncertainty may cause customers, suppliers and
channel partners to delay or defer decisions concerning PRI or Brooks, which
could negatively affect their respective businesses. Customers, suppliers and
channel partners may also seek to change existing agreements with PRI or Brooks
as a result of the merger. Any delay or deferral of those decisions or changes
in existing agreements could have a material adverse effect on the respective
businesses of PRI and Brooks, regardless of whether the merger is ultimately
completed.

PRI STOCKHOLDERS WILL RECEIVE A FIXED NUMBER OF SHARES OF BROOKS COMMON STOCK
DESPITE CHANGES IN MARKET VALUE OF PRI COMMON STOCK OR BROOKS COMMON STOCK, AND
THE DOLLAR VALUE OF BROOKS COMMON STOCK RECEIVED IN THE MERGER MAY INCREASE OR
DECREASE AFTER PRI STOCKHOLDERS SUBMIT THEIR PROXIES.

     Upon the merger's completion, each share of PRI common stock will be
exchanged for 0.52 shares of Brooks common stock. There will be no adjustment
for changes in the market price of either PRI common stock or Brooks common
stock. In addition, neither PRI nor Brooks may terminate the merger agreement or
"walk away" from the merger or resolicit the vote of its stockholders solely
because of changes in the market price of the PRI common stock or the Brooks
common stock. Accordingly, the specific dollar value of Brooks common stock that
PRI stockholders will receive upon the merger's completion will depend on the
market value of Brooks common stock when the merger is completed and may
decrease from the date you submit your proxy. The market price of Brooks common
stock is by nature subject to the general price fluctuations in the market for
publicly traded equity securities and has experienced significant volatility. In
addition, the market price of the common stock of Brooks and PRI may decline as
a result of any of the risks described in this section. We urge you to obtain
current market quotations for Brooks common stock and PRI common stock. Brooks
cannot predict or give any assurances as to the market price of Brooks common
stock at any time before or after the completion of the merger. See "Comparative
Per Share Market Price and Dividend Data" on page 94 for additional trading
information.

FAILURE TO RETAIN KEY EMPLOYEES COULD DIMINISH THE ANTICIPATED BENEFITS OF THE
MERGER.

     The success of the merger will depend in part on the retention of personnel
critical to the business and operations of the combined company due to, for
example, their technical skills or management expertise. Employees may
experience uncertainty about their future role with Brooks and PRI until
strategies with regard to these employees are announced or executed. Brooks and
PRI have different corporate cultures, and some Brooks and PRI employees may not
want to work for the combined company. In addition, competitors may recruit
employees during Brooks' integration of PRI, as is common in high technology
mergers. If Brooks and PRI are unable to retain personnel that are critical to
the successful integration and future operation of the companies, Brooks and PRI
could face disruptions in their operations, loss of existing customers, loss of
key information, expertise or know-how, and unanticipated additional recruitment
and training costs. In addition, the loss of key personnel could diminish the
anticipated benefits of the merger.

THE MARKET PRICE OF BROOKS COMMON STOCK MAY DECLINE AS A RESULT OF THE MERGER.

     The market price of Brooks common stock may decline as a result of the
merger if:

     - the integration of Brooks and PRI is unsuccessful;

     - Brooks does not achieve or is perceived not to have achieved the expected
       benefits of the merger as rapidly or to the extent anticipated by
       financial or industry analysts or investors; or

                                        19


     - the effect of the merger on Brooks' financial results is not consistent
       with the expectations of financial or industry analysts or investors.

     The market price of the Brooks common stock could also decline as a result
of unforeseen factors related to the merger or other factors described in this
section.

THE MERGER MAY GO FORWARD IN CERTAIN CIRCUMSTANCES EVEN IF BROOKS OR PRI SUFFERS
A MATERIAL ADVERSE CHANGE.

     In general, either party can refuse to complete the merger if there is a
material adverse change affecting the other party before the closing. However,
neither party may refuse to complete the merger on that basis if the change
results from:

     - adverse changes in general economic, regulatory or political conditions,
       unless the change disproportionately affects the other party;

     - adverse changes in the semiconductor capital equipment industry, the flat
       panel display manufacturing equipment industry, or the data storage
       industry generally, unless the change disproportionately affects the
       other party;

     - any change in the trading price of the common stock of the other party;

     - any failure to meet revenue, earnings or bookings predictions; or

     - any reduction-in-force.

     If adverse changes occur but Brooks and PRI must still complete the merger,
Brooks' stock price may suffer. This in turn may reduce the value of the merger
to Brooks and PRI stockholders.

IF GOVERNMENTAL AUTHORITIES CHALLENGE THE MERGER, THE MERGER MAY NOT OCCUR, MAY
BE DELAYED OR MAY OCCUR ON UNFAVORABLE TERMS IMPOSED BY THE GOVERNMENTAL
AUTHORITIES.

     Before Brooks and PRI may complete the merger, they must submit
notifications to antitrust authorities in the United States and potentially
other foreign countries and satisfy related waiting period requirements.
Pursuant to the Hart-Scott-Rodino Act, Brooks and PRI on November 13, 2001
submitted a Premerger Notification and Report Form with respect to the merger to
the United States Department of Justice and the United States Federal Trade
Commission. On December 13, 2001, each of Brooks and PRI received a request for
additional information and other documentary material, commonly called a second
request, from the Antitrust Division of the U.S. Department of Justice. Under
the Hart-Scott-Rodino Act, this second request extends the waiting period for
the merger until 30 days after the parties' substantial compliance with the
request, unless the parties and the Department of Justice agree on a different
time period. The parties achieved substantial compliance with the request on
March 1, 2002. The Department of Justice, state antitrust authorities or the
antitrust authorities of another country could attempt to prevent the merger
from occurring before or after the expiration of the Hart-Scott-Rodino waiting
period, or could place conditions on their approval of the merger that may delay
the merger, increase the combined company's operating costs, require it to
discontinue or dispose of some of its products or businesses or otherwise limit
its future actions. Any such conditions could have a material adverse effect on
the business and results of operations of the combined company.

THE MERGER WILL RESULT IN SUBSTANTIAL DILUTION OF THE OWNERSHIP INTERESTS OF
CURRENT BROOKS STOCKHOLDERS.

     Upon completion of the merger, each share of PRI common stock will be
exchanged for 0.52 shares of Brooks common stock. As a result, the current
stockholders of Brooks will own approximately 60% of the outstanding common
stock of the combined company, based on the number of outstanding shares of
common stock of Brooks and PRI on March 31, 2002. This represents substantial
dilution of the ownership interests of the current Brooks stockholders.

                                        20


THE COSTS OF THE MERGER WILL BE SUBSTANTIAL, WHICH COULD HARM THE FINANCIAL
RESULTS OF THE COMBINED COMPANY.

     Brooks and PRI expect to incur one-time and other charges of between $45
million and $55 million in connection with the merger. These charges exclude
direct transaction costs of $15.8 million to be incurred by Brooks and $11.5
million to be incurred by PRI and capital expenditures of $8.8 million to
support the merger. Direct transaction costs principally consist of investment
banking, accounting, legal and public relations consulting fees of both
companies. Capital expenditures consist of required investments to the combined
company's infrastructure to provide common business and financial systems. If
the benefits of the merger do not exceed the costs associated with the merger,
including any dilution to Brooks stockholders resulting from the issuance of
shares of Brooks common stock in the merger, the combined company's financial
results, including earnings per share, could suffer, and the market price of the
combined company's common stock could decline.

THE TERMINATION FEE AND RESTRICTIONS ON SOLICITATION CONTAINED IN THE MERGER
AGREEMENT MAY DISCOURAGE OTHER COMPANIES FROM TRYING TO ACQUIRE PRI.

     Until the completion of the merger, with limited exceptions, the merger
agreement prohibits PRI from entering into or soliciting any acquisition
proposal or offer for a merger or other business combination with a party other
than Brooks. PRI has agreed to pay Brooks a termination fee of $14 million plus
reimbursement of expenses in specified circumstances, including where PRI's
board of directors withdraws its support of the merger with Brooks to support a
business combination with a third party. These provisions could discourage other
companies from trying to acquire PRI even though those other companies might be
willing to offer greater value to PRI stockholders than Brooks has offered in
the merger.

THE RIGHTS OF HOLDERS OF PRI COMMON STOCK WILL CHANGE AS A RESULT OF THE MERGER.

     After the merger, stockholders of PRI, a Massachusetts corporation, will
become stockholders of Brooks, a Delaware corporation, and their rights will be
governed by Delaware law and Brooks' charter and bylaws, which are different
from Massachusetts law and PRI's charter and bylaws. As a result of these
differences, PRI stockholders may have less control over corporate actions
proposed to be taken by Brooks than they would have had over corporate actions
proposed to be taken by PRI. These differences include:

     - as long as the Brooks common stock is publicly traded, holders of that
       stock generally do not have appraisal rights in connection with any
       merger involving Brooks;

     - PRI's charter cannot be amended without the affirmative vote of not less
       than two-thirds of each class of stock outstanding and entitled to vote.
       In contrast, once a majority of the Brooks board approves, the Brooks
       charter can be amended with the approval of holders of only a majority of
       each class of stock outstanding and entitled to vote; and

     - certain provisions of the PRI bylaws can only be amended with the
       approval of the holders of at least 80% of the voting power of all PRI
       shares entitled to vote generally in the election of directors, voting
       together as a single class. In contrast, any provision of the Brooks
       bylaws can be amended with the approval of the holders of only a majority
       of the stock outstanding and entitled to vote.

     For more information, see "Comparison of Stockholder Rights," beginning on
page 102.

FAILURE TO COMPLETE THE MERGER COULD CAUSE BROOKS' AND PRI'S STOCK PRICE TO
DECLINE AND COULD HARM BROOKS' AND PRI'S BUSINESS AND OPERATING RESULTS.

     The merger agreement contains conditions which Brooks and/or PRI must meet
to complete the merger. In addition, the merger agreement may be terminated by
either Brooks or PRI under specified

                                        21


circumstances. If the merger is not completed for any reason, Brooks and PRI may
be subject to a number of risks, including the following:

     - the market price of Brooks and PRI common stock may decline to the extent
       that the relevant current market price reflects a market assumption that
       the merger will be completed;

     - many costs related to the merger, such as legal, accounting, financial
       advisor and financial printing fees, have to be paid regardless of
       whether the merger is completed; and

     - there may be substantial disruption to the businesses of Brooks and PRI
       and distraction of their workforces and management teams.

OFFICERS AND DIRECTORS OF BROOKS AND PRI WILL RECEIVE BENEFITS THAT MAY HAVE
INFLUENCED THEM TO SUPPORT OR APPROVE THE MERGER.

     Some of the directors and officers of Brooks and PRI have interests in the
merger that are different from the interests of the stockholders of Brooks and
PRI, including the following:

     - Under his employment agreement with Brooks, in the event the merger with
       PRI is completed, Robert J. Therrien, Brooks' president and a member of
       its board of directors, will receive an increase in salary from $500,000
       to $615,000 and more favorable supplemental retirement benefits, in the
       form of an increase of $9,583 in his minimum monthly retirement benefit
       and the payment of his retirement benefit in a single, lump-sum payment
       rather than over a period of time;

     - Brooks has approved a new, more favorable compensation package for its
       nonemployee directors in the event the merger with PRI is completed,
       which will increase the annual pay to such directors from $1,000 to
       $20,000, and will also increase annual compensation for nonemployee
       directors who serve on a committee from $4,000 to $5,000 per year for
       each committee on which they serve. The initial and annual option grants
       to nonemployee directors will be increased from 10,000 and 5,000 shares
       of Brooks common stock to 25,000 and 10,000 shares, respectively, and
       there will be a one-time grant of 15,000 shares to existing nonemployee
       directors;

     - all officers and numerous other employees of PRI have retention
       agreements under which they will be entitled to severance payments if
       Brooks does not offer them employment after the merger at a comparable
       salary. These officers and employees will also be entitled to accelerated
       vesting of all of their outstanding options, including the PRI options
       assumed by Brooks in the merger, if Brooks does not offer them employment
       after the merger at a comparable salary, or if Brooks offers them such
       employment and they remain in their new positions for one year after the
       merger. As of December 31, 2001 (exclusive of Mr. Tyson's benefits
       described below), the fair market value using the Black-Scholes option
       pricing model of all of the options subject to possible accelerated
       vesting was approximately $28.5 million and the maximum amount of
       severance payments to be made was $10.4 million;

     - Mitchell G. Tyson, the president and chief executive officer of PRI, as
       well as a member of PRI's board of directors, has entered into an
       employment agreement with Brooks which will become effective if the
       merger is completed under which he will be entitled to a six month salary
       of $182,000, 100% accelerated vesting of all of his outstanding options
       (fair market value using the Black-Scholes option pricing model of
       approximately $4.5 million as of December 31, 2001), a retention bonus of
       $364,000 in the event that he fulfills his six month employment
       obligation, and payments of $546,000 per year in exchange for a two year
       non-competition covenant;

     - Brooks has agreed that upon the completion of the merger, Mitchell G.
       Tyson and Kenneth M. Thompson, each of whom are currently PRI directors,
       will be appointed to the board of directors of Brooks; and

     - Brooks has agreed to maintain all rights to indemnification now existing
       in favor of the current and former directors and officers of PRI and its
       subsidiaries against liabilities arising out of their service as officers
       and directors of PRI before the merger.

                                        22


                        RISKS RELATED TO BROOKS AND PRI

     The following risk factors apply to each of Brooks and PRI and are expected
to apply to Brooks after completion of the merger.

RISK FACTORS RELATING TO BROOKS' AND PRI'S INDUSTRY

THE CYCLICAL DEMAND OF SEMICONDUCTOR MANUFACTURERS AFFECTS BROOKS' AND PRI'S
OPERATING RESULTS AND THE ONGOING DOWNTURN IN THAT INDUSTRY COULD SERIOUSLY HARM
THE COMBINED COMPANY'S OPERATING RESULTS.

     Brooks' and PRI's business is significantly dependent on capital
expenditures by semiconductor manufacturers. The level of semiconductor
manufacturers' capital expenditures is dependent on the current and anticipated
market demand for semiconductors. The semiconductor industry is highly cyclical
and is currently experiencing a downturn. Brooks and PRI anticipate the downturn
will continue during the next few quarters. Despite these industry conditions,
Brooks and PRI each plan to continue to invest in those areas which it believes
are important to its long-term growth, such as its infrastructure and
information technology systems, customer support, supply chain management and
new products. As a result, consistent with their experience in downturns in the
past, Brooks and PRI believe the current industry downturn will lead to reduced
revenues for them and may cause them to incur losses.

INDUSTRY CONSOLIDATION AND OUTSOURCING OF THE MANUFACTURE OF SEMICONDUCTORS TO
FOUNDRIES COULD REDUCE THE NUMBER OF AVAILABLE CUSTOMERS.

     The substantial expense of building or expanding a semiconductor
fabrication facility is leading increasing numbers of semiconductor companies to
contract with foundries, which manufacture semiconductors designed by others. As
manufacturing is shifted to foundries, the number of Brooks' and PRI's potential
customers could decrease, which would increase their dependence on their
remaining customers. Recently, consolidation within the semiconductor
manufacturing industry has increased. If semiconductor manufacturing is
consolidated into a small number of foundries and other large companies, Brooks'
and PRI's failure to win any significant bid to supply equipment to those
customers could seriously harm their reputation and materially and adversely
affect their revenue and operating results.

THE FUTURE OPERATIONS OF THE COMBINED COMPANY COULD BE HARMED IF THE COMMERCIAL
ADOPTION OF 300MM WAFER TECHNOLOGY CONTINUES TO PROGRESS SLOWLY OR IS HALTED.

     The future operations of the combined company depend in part on the
adoption of new systems and technologies to automate the processing of 300mm
wafers. However, the industry transition from the current, widely used 200mm
manufacturing technology to 300mm manufacturing technology is occurring more
slowly than expected. A significant delay in the adoption of 300mm manufacturing
technology, or the failure of the industry to adopt 300mm manufacturing
technology, could significantly impair the operations of the combined company.
Moreover, continued delay in transition to 300mm technology could permit
competitors to introduce competing or superior 300mm products at more
competitive prices. As a result of these factors, competition for 300mm orders
is vigorous and could harm Brooks' results of operations. Brooks' proposed
merger with PRI does not mitigate this risk. Manufacturers implementing factory
automation in 300mm pilot projects typically seek to purchase systems from
multiple vendors. To date, nearly all manufacturers with pilot projects have
selected PRI's competitors' systems for these projects. Manufacturers' awards to
PRI's competitors of early 300mm orders could make it more difficult for PRI to
win orders from those manufacturers for their full-scale 300mm production
facilities.

PRI'S DIFFICULTIES WITH PRODUCTION OF ITS TURBOSTOCKER PRODUCT COULD ADVERSELY
AFFECT ITS ABILITY TO COMPETE IN THE 300MM WAFER TECHNOLOGY MARKETPLACE.

     In late fiscal 2000 and early fiscal 2001, PRI encountered manufacturing
and supply chain problems related to its recently introduced TurboStocker
product, which PRI had planned to begin manufacturing in high volume in the
fourth quarter of fiscal 2000 in response to increased customer demand at the
time. These problems caused delays in shipments and in customer acceptance of
these systems, and in some cases required repair or retrofit of TurboStockers
already installed in the field. PRI's TurboStocker

                                        23


manufacturing problems, to the extent they have undermined or may undermine
potential 300mm customers' confidence in PRI's ability to manufacture and
deliver complex factory automation systems in a timely manner and at acceptable
quality levels, have adversely affected, and may continue to adversely affect,
PRI's reputation and, as a result, the competitive position of the combined
company in the market for 300mm products.

RISK FACTORS RELATING TO BROOKS' AND PRI'S OPERATIONS

BROOKS' AND PRI'S SALES VOLUME SUBSTANTIALLY DEPENDS ON THE SALES VOLUME OF
BROOKS' AND PRI'S ORIGINAL EQUIPMENT MANUFACTURER CUSTOMERS AND ON INVESTMENT IN
MAJOR CAPITAL EXPANSION PROGRAMS BY END-USER SEMICONDUCTOR MANUFACTURING
COMPANIES.

     Brooks and PRI sell a majority of their tool automation products to
original equipment manufacturers that incorporate Brooks' and PRI's products
into their equipment. Therefore, Brooks' and PRI's revenues depend on the
ability of these customers to develop, market and sell their equipment in a
timely, cost-effective manner. Approximately 40% of Brooks' total revenue for
the quarter ended December 31, 2001 and approximately 56% of Brooks' total
revenue in fiscal 2001, comes from sales to original equipment manufacturers.
Almost all of PRI's revenue from its OEM Systems division, which accounted for
approximately 17% of PRI's total net revenue for the quarter ended December 31,
2001 and approximately 39% of PRI's total net revenue in fiscal 2001, comes from
sales to original equipment manufacturers. Approximately 29% and 51% of the
combined revenue of Brooks and PRI came from sales to these customers in the
quarter ended December 31, 2001 and fiscal 2001, respectively.

     Brooks and PRI also generate significant revenues from large orders from
semiconductor manufacturing companies that build new plants or invest in major
automation retrofits. Brooks' and PRI's revenues depend, in part, on continued
capital investment by semiconductor manufacturing companies. Approximately 60%
of Brooks' total revenue for the quarter ended December 31, 2001 and
approximately 44% of Brooks' total revenue in fiscal 2001, comes from sales to
semiconductor manufacturing companies. Almost all of PRI's revenue from its
Factory Systems and Software Systems divisions, which accounted for
approximately 83% of PRI's total net revenue for the quarter ended December 31,
2001 and approximately 61% of PRI's total net revenue in fiscal 2001, comes from
sales to semiconductor manufacturing companies. Approximately 71% and 49% of the
combined revenue of Brooks and PRI came from sales to these customers in the
quarter ended December 31, 2001 and fiscal 2001, respectively.

DEMAND FOR BROOKS' AND PRI'S PRODUCTS FLUCTUATES RAPIDLY AND UNPREDICTABLY,
WHICH MAKES IT DIFFICULT TO MANAGE THEIR BUSINESSES EFFICIENTLY AND CAN REDUCE
THEIR GROSS MARGINS AND PROFITABILITY.

     Brooks' and PRI's expense levels are based in part on their expectations
for future demand. Many expenses, particularly those relating to capital
equipment and manufacturing overhead, are relatively fixed. The rapid, and
unpredictable shifts in demand for Brooks' and PRI's products make it difficult
to plan manufacturing capacity and business operations efficiently. If demand is
significantly below expectations Brooks and PRI may be unable to rapidly reduce
these fixed costs, which can diminish gross margins and cause losses. A sudden
downturn may also leave Brooks and PRI with excess inventory, which may be
rendered obsolete as products evolve during the downturn and demand shifts to
newer products. For example, as a result of the current industry downturn, PRI
recorded special charges in the second and fourth quarters of fiscal year 2001
in the aggregate amount of $9.7 million relating to inventory write-downs and
costs associated with order cancellations. Brooks' and PRI's ability to reduce
expenses is further constrained because they must continue to invest in research
and development to maintain their competitive position and to maintain service
and support for their existing global customer base. Conversely, in sudden
upturns, Brooks and PRI sometimes incur significant expenses to rapidly expedite
delivery of components, procure scarce components and outsource additional
manufacturing processes. These expenses could reduce their gross margins and
overall profitability. Any of these results could seriously harm Brooks' and
PRI's business.

                                        24


BROOKS AND PRI RELY ON A RELATIVELY LIMITED NUMBER OF CUSTOMERS FOR A LARGE
PORTION OF THEIR REVENUES AND BUSINESS.

     Brooks and PRI receive a significant portion of their revenues in each
fiscal period from a relatively limited number of customers. The loss of one or
more of these major customers, or a decrease in orders by one or more customers,
could adversely affect Brooks' and PRI's revenue, business and reputation. Sales
to Brooks' ten largest customers accounted for approximately 39% of total
revenues in the quarter ended December 31, 2001, 37% of total revenues in fiscal
2001 and 40% of total revenues in fiscal 2000. Sales to PRI's top ten customers
accounted for 61% of PRI's total net revenue in fiscal 2001 and 54% in fiscal
2000. In fiscal 2001, sales to Intel accounted for 21% and sales to KLA-Tencor
accounted for 11% of PRI's total net revenue.

DELAYS IN OR CANCELLATION OF SHIPMENTS OR CUSTOMER ACCEPTANCE OF A FEW OF
BROOKS' AND PRI'S LARGE ORDERS COULD SUBSTANTIALLY DECREASE THEIR REVENUES OR
REDUCE THEIR STOCK PRICES.

     Historically, a substantial portion of Brooks' and PRI's quarterly and
annual revenues has come from sales of a small number of large orders. Some of
Brooks' products have high selling prices compared to Brooks' other products.
The purchase price of PRI's systems generally ranges from $3.0 million to $20.0
million, and PRI usually takes more than one or two fiscal quarters to deliver
and install these systems and obtain customer acceptance. As a result, the
timing of when Brooks and, particularly, PRI recognize revenue from one of these
large orders can have a significant impact on their total revenues and operating
results for a particular period because their sales in that fiscal period could
fall significantly below the expectations of financial analysts and investors.
This could cause the value of their common stock to fall. Brooks' and PRI's
operating results could be harmed if a small number of large orders are canceled
or rescheduled by customers or cannot be filled due to delays in manufacturing,
testing, shipping or product acceptance.

BROOKS AND PRI DO NOT HAVE LONG-TERM CONTRACTS WITH THEIR CUSTOMERS AND BROOKS'
AND PRI'S CUSTOMERS MAY CEASE PURCHASING THEIR PRODUCTS AT ANY TIME.

     Brooks and PRI generally do not have long-term contracts with their
customers. As a result, Brooks' and PRI's agreements with their customers do not
provide any assurance of future sales. Accordingly:

     - Brooks' and PRI's customers can cease purchasing their products at any
       time without penalty;

     - Brooks' and PRI's customers are free to purchase products from
       competitors;

     - Brooks and PRI are exposed to competitive price pressure on each order;
       and

     - Brooks' and PRI's customers are not required to make minimum purchases.

BROOKS' SYSTEMS INTEGRATION SERVICES BUSINESS HAS GROWN SIGNIFICANTLY RECENTLY,
AND POOR EXECUTION OF THOSE SERVICES COULD ADVERSELY IMPACT BROOKS' OPERATING
RESULTS.

     The number of projects Brooks is pursuing for its systems integration
services business has grown significantly recently. This business consists of
integrating combinations of Brooks software and hardware products to provide
more comprehensive solutions for Brooks' end-user customers. The delivery of
these services typically is complex, requiring that Brooks coordinate personnel
with varying technical backgrounds in performing substantial amounts of services
in accordance with timetables. Brooks is in the early stages of developing this
business, and it is subject to the risks attendant to entering a business in
which it has limited direct experience. In addition, Brooks' ability to supply
these services and increase its revenues is limited by its ability to retain,
hire and train systems integration personnel. Brooks believes that there is
significant competition for personnel with the advanced skills and technical
knowledge that it needs. Some of Brooks' competitors may have greater resources
to hire personnel with those skills and knowledge. Brooks' operating margins
could be adversely impacted if it does not effectively hire and train additional
personnel or deliver systems integration services to its customers on a
satisfactory and timely basis consistent with its budgets.

                                        25


BROOKS' AND PRI'S LENGTHY SALES CYCLES REQUIRE THEM TO INCUR SIGNIFICANT
EXPENSES WITH NO ASSURANCE THAT THEY WILL GENERATE REVENUE.

     Brooks' and PRI's tool automation products are generally incorporated into
original equipment manufacturer equipment at the design stage. To obtain new
business from original equipment manufacturer customers, Brooks and PRI must
develop products for selection by a potential customer at the design stage. This
often requires Brooks and PRI to make significant expenditures without any
assurance of success. The original equipment manufacturer's design decisions
often precede the generation of volume sales, if any, by a year or more. Brooks
and PRI cannot guarantee that the equipment manufactured by their original
equipment manufacturing customers will be commercially successful. If Brooks or
PRI or any of their respective original equipment manufacturing customers fails
to develop and introduce new products successfully and in a timely manner,
Brooks' or PRI's business, as the case may be, and financial results will
suffer.

     Brooks and PRI also must complete successfully a costly evaluation and
proposal process before they can achieve volume sales of factory automation
software and systems to customers. These undertakings are major decisions for
most prospective customers and typically involve significant capital commitments
and lengthy evaluation and approval processes. Brooks and PRI cannot guarantee
that they will continue to satisfy evaluations by their end-user customers.

BROOKS' AND PRI'S OPERATING RESULTS WOULD BE HARMED IF ONE OF THEIR KEY
SUPPLIERS FAILS TO DELIVER COMPONENTS FOR THEIR PRODUCTS.

     Brooks and PRI currently obtain many of their components on an as needed,
purchase order basis. Generally, Brooks and PRI do not have any long-term supply
contracts with their vendors and they believe many of their vendors have been
taking cost containment measures in response to the industry downturn. When
demand for semiconductor manufacturing equipment increases, Brooks' and PRI's
suppliers face significant challenges in delivering components on a timely
basis. Brooks' or PRI's inability to obtain components in required quantities or
of acceptable quality could result in significant delays or reductions in
product shipments. This could create customer dissatisfaction, cause lost
revenue and otherwise materially and adversely affect Brooks' and PRI's
operating results. Delays on Brooks' or PRI's part could also cause them to
incur contractual penalties for late delivery.

BROOKS MAY EXPERIENCE AND PRI MAY CONTINUE TO EXPERIENCE DELAYS AND TECHNICAL
DIFFICULTIES IN NEW PRODUCT INTRODUCTIONS AND MANUFACTURING, WHICH CAN ADVERSELY
AFFECT THEIR REVENUES, GROSS MARGINS AND NET INCOME.

     Because Brooks' and PRI's systems are complex, there can be a significant
lag between the time Brooks or PRI introduces a system and the time it begins to
produce that system in volume. As technology in the semiconductor industry
becomes more sophisticated, Brooks and PRI are finding it increasingly difficult
to design and integrate complex technologies into their systems, to procure
adequate supplies of specialized components, to train their technical and
manufacturing personnel and to make timely transitions to high-volume
manufacturing. Many customers also require customized systems, which compound
these difficulties. Brooks and PRI sometimes incur substantial unanticipated
costs to ensure that their new products function properly and reliably early in
their life cycle. These costs could include greater than expected installation
and support costs or increased materials costs as a result of expedited changes.
Brooks and PRI may not be able to pass these costs on to their customers. In
addition, Brooks and PRI have experienced, and may continue to experience,
difficulties in both low and high volume manufacturing. Any of these results
could seriously harm the businesses of Brooks and PRI.

     For example, beginning late in the third quarter of fiscal 2000, PRI
encountered manufacturing and supply chain problems relating to its TurboStocker
product, which PRI had planned to begin manufacturing in high volume in the
fourth quarter of fiscal 2000 in response to increased customer demand at that
time. These problems have delayed shipments and customer acceptance, which
caused PRI's revenues for fiscal 2000 and 2001 to be lower than expected and
also contributed to its net losses for these periods. Since PRI discovered these
problems, it has incurred expenditures of $15.4 million to

                                        26


address them, consisting of approximately $3.4 million for associated
engineering costs, $5.7 million of additional warranty costs, and $6.3 million
to repair or retrofit TurboStockers already installed in the field where
necessary. These costs also contributed to PRI's losses for these periods. Of
these costs, the $6.3 million reserve for repairs and retrofits was recorded as
a special charge in the fourth quarter of PRI's fiscal year 2001. The balance of
the costs were recorded in PRI's results of operations during the period
beginning with the fourth quarter of its fiscal year 2000 and ending with the
last quarter of its fiscal year 2001. PRI has also consolidated its TurboStocker
manufacturing operations into a single location, upgraded its enterprise
resource planning system and outsourced additional manufacturing of components
and subassemblies. PRI's efforts to date may be insufficient to resolve its
manufacturing problems with its TurboStocker, and PRI may encounter similar
difficulties and delays in the future. Moreover, on occasion both Brooks and PRI
have failed to meet their customers' delivery or performance criteria, and as a
result Brooks and PRI have deferred revenue recognition and incurred late
delivery penalties and had higher warranty and service costs. These failures
could continue and could also cause Brooks and PRI to lose business from those
customers and suffer long-term damage to their reputations.

BROOKS AND PRI MAY BE UNABLE TO RECRUIT AND RETAIN NECESSARY PERSONNEL BECAUSE
OF INTENSE COMPETITION FOR HIGHLY SKILLED PERSONNEL.

     Brooks and PRI need to retain a substantial number of employees with
technical backgrounds for both their hardware and software engineering,
manufacturing, sales and support staffs. The market for these employees is
intensively competitive, and Brooks and PRI have occasionally experienced delays
in hiring qualified personnel. Due to the cyclical nature of the demand for
their products and the current downturn in the semiconductor market, both Brooks
and PRI have recently reduced their workforces as cost reduction measures. If
the semiconductor market experiences an upturn, Brooks and PRI may need to
rebuild their workforces. Due to the competitive nature of the labor markets in
which Brooks and PRI operate, this type of employment cycle increases Brooks'
and PRI's risk of being unable to retain and recruit key personnel. Brooks' and
PRI's inability to recruit, retain and train adequate numbers of qualified
personnel on a timely basis could adversely affect their ability to develop,
manufacture, install and support their products and may result in lost revenue
and market share if customers seek alternative solutions.

BROOKS' AND PRI'S INTERNATIONAL BUSINESS OPERATIONS EXPOSE THEM TO A NUMBER OF
DIFFICULTIES IN COORDINATING THEIR ACTIVITIES ABROAD AND IN DEALING WITH
MULTIPLE REGULATORY ENVIRONMENTS.

     Sales to customers outside North America accounted for approximately 61% of
Brooks' total revenues in the quarter ended December 31, 2001, 50% in fiscal
2001, 48% in fiscal 2000, and 43% in fiscal 1999. Sales to customers outside the
United States accounted for approximately 32% of PRI's total revenues in the
quarter ended December 30, 2001, 38% in fiscal 2001, 36% in fiscal 2000 and 33%
in fiscal 1999. Brooks and PRI anticipate that international sales will continue
to account for a significant portion of their revenues. Many of Brooks' and
PRI's vendors are located in foreign countries. As a result of their
international business operations, Brooks and PRI are subject to various risks,
including:

     - difficulties in staffing and managing operations in multiple locations in
       many countries;

     - difficulties in managing distributors, representatives and third party
       systems integrators;

     - challenges presented by collecting trade accounts receivable in foreign
       jurisdictions;

     - longer sales cycles;

     - possible adverse tax consequences;

     - fewer legal protections for intellectual property;

     - governmental currency controls and restrictions on repatriation of
       earnings;

     - changes in various regulatory requirements;

     - political and economic changes and disruptions; and

     - export/import controls, trading policies and tariff regulations.

     To support their international customers, Brooks maintains locations in
several countries, including Belgium, Canada, China, Germany, Japan, Malaysia,
Singapore, South Korea, Switzerland, Taiwan and

                                        27


the United Kingdom. PRI maintains locations in several countries, including
Canada, France, Germany, Japan, Singapore, South Korea, Taiwan and the United
Kingdom. Brooks and PRI cannot guarantee that they will be able to manage these
operations effectively. Brooks and PRI cannot assure you that their investment
in these international operations will enable them to compete successfully in
international markets or to meet the service and support needs of their
customers, some of whom are located in countries where Brooks and PRI have no
infrastructure.

     Although Brooks' and PRI's international sales are primarily denominated in
U.S. dollars, changes in currency exchange rates can make it more difficult for
Brooks and PRI to compete with foreign manufacturers on price. If Brooks' and
PRI's international sales increase relative to their total revenues, these
factors could have a more pronounced effect on their operating results.

BROOKS AND PRI MUST CONTINUALLY IMPROVE THEIR TECHNOLOGY TO REMAIN COMPETITIVE.

     Technology changes rapidly in the semiconductor, data storage and flat
panel display manufacturing industries. Brooks and PRI believe their success
depends in part upon their ability to enhance their existing products and to
develop and market new products to meet customer needs, even in industry
downturns. For example, as the semiconductor industry transitions from 200mm
manufacturing technology to 300mm technology, Brooks and PRI believe it is
important to their future success to develop and sell new products that are
compatible with 300mm technology. If competitors introduce new technologies or
new products, Brooks' and PRI's sales could decline and their existing products
could lose market acceptance. Brooks and PRI cannot guarantee that they will
identify and adjust to changing market conditions or succeed in introducing
commercially rewarding products or product enhancements. The success of Brooks'
and PRI's product development and introduction depends on a number of factors,
including:

     - accurately identifying and defining new market opportunities and
       products;

     - completing and introducing new product designs in a timely manner;

     - market acceptance of Brooks' and PRI's products and their customers'
       products;

     - timely and efficient software development, testing and process;

     - timely and efficient implementation of manufacturing and assembly
       processes;

     - product performance in the field;

     - development of a comprehensive, integrated product strategy; and

     - efficient implementation and installation and technical support services.

     Because Brooks and PRI must commit resources to product development well in
advance of sales, their product development decisions must anticipate
technological advances by leading semiconductor manufacturers. Brooks and PRI
may not succeed in that effort. Their inability to select, develop, manufacture
and market new products or enhance their existing products could cause them to
lose their competitive positions and could seriously harm their businesses.

BROOKS AND PRI FACE SIGNIFICANT COMPETITION WHICH COULD RESULT IN DECREASED
DEMAND FOR THEIR PRODUCTS OR SERVICES.

     The markets for Brooks' and PRI's products are intensely competitive.
Brooks and PRI may be unable to compete successfully.

     Brooks believes the primary competitive factors in the tool automation
systems segment are throughput, reliability, contamination control, accuracy and
price/performance. Brooks believes that its primary competition in the tool
automation market is from integrated original equipment manufacturers that
satisfy their semiconductor and flat panel display handling needs internally
rather than by purchasing systems or modules from an independent supplier like
Brooks. Many of these original equipment manufacturers have substantially
greater resources than Brooks does. Applied Materials, Inc., the leading process
equipment original equipment manufacturer, develops and manufactures its own
central wafer handling systems and modules. Brooks may not be successful in
selling its products to original equipment

                                        28


manufacturers that internally satisfy their wafer or substrate handling needs,
regardless of the performance or the price of Brooks products. Moreover,
integrated original equipment manufacturers may begin to commercialize their
handling capabilities and become Brooks competitors.

     Brooks believes that the primary competitive factors in the factory
interface market are technical and technological capabilities, reliability,
price/performance, ease of integration and global sales and support capability.
In this market, Brooks competes directly with Asyst, Rorze, Fortrend, Newport,
TDK, Yasakawa and Hirata. Some of these competitors have substantial financial
resources and extensive engineering, manufacturing and marketing capabilities.

     Brooks believes that the primary competitive factors in the end-user
semiconductor manufacturer market for factory automation and process control
solutions are product functionality, price/performance, ease of use, ease of
integration and installation, hardware and software platform compatibility,
costs to support and maintain, vendor reputation and financial stability. The
relative importance of these competitive factors may change over time. Brooks
directly competes in this market with various competitors, including Applied
Materials-Consilium, IBM, Si-view, Compaq, TRW, Camstar and numerous small,
independent software companies. Brooks also competes with the in-house software
staffs of semiconductor manufacturers like NEC, Texas Instruments and Intel.
Most of those manufacturers have substantially greater resources than Brooks
does.

     PRI's factory automation systems division competes with Daifuku, Murata
Machinery, Shinko Electric and a number of other smaller foreign and domestic
manufacturers of automated machinery used in semiconductor fabrication
facilities. The primary competitive factors in the market are quality,
robustness and performance, price, ease of integration, vendor reputation,
financial stability, support and on-time delivery.

BROOKS' RECENT RAPID GROWTH IS STRAINING ITS OPERATIONS AND REQUIRING IT TO
INCUR COSTS TO UPGRADE ITS INFRASTRUCTURE.

     During fiscal 2000 and 2001, Brooks experienced extremely rapid growth in
its operations, its product offerings and the geographic area of its operations.
The proposed merger with PRI will continue this trend. Brooks' growth has placed
a significant strain on its management, operations and financial systems.
Brooks' future operating results will depend in part on its ability to continue
to implement and improve its operating and financial controls and management
information systems. If Brooks fails to manage its growth effectively, its
financial condition, results of operations and business could be harmed.

MUCH OF BROOKS' AND PRI'S SUCCESS AND VALUE LIES IN THEIR OWNERSHIP AND USE OF
INTELLECTUAL PROPERTY, AND THEIR FAILURE TO PROTECT THAT PROPERTY COULD
ADVERSELY AFFECT THEIR FUTURE OPERATIONS.

     Brooks' and PRI's ability to compete is heavily affected by their ability
to protect their intellectual property. Brooks and PRI rely primarily on trade
secret laws, confidentiality procedures, patents, copyrights, trademarks and
licensing arrangements to protect their intellectual property. The steps Brooks
and PRI have taken to protect their technology may be inadequate. Existing trade
secret, trademark and copyright laws offer only limited protection. Brooks' and
PRI's patents could be invalidated or circumvented. The laws of certain foreign
countries in which Brooks' and PRI's products are or may be developed,
manufactured or sold may not fully protect their products. This may make the
possibility of piracy of Brooks' and PRI's technology and products more likely.
Brooks and PRI cannot guarantee that the steps they have taken to protect their
intellectual property will be adequate to prevent misappropriation of their
technology. Other companies could independently develop similar or superior
technology without violating Brooks' or PRI's proprietary rights. There has been
substantial litigation regarding patent and other intellectual property rights
in semiconductor-related industries. Brooks and PRI may engage in litigation to:

     - enforce their patents;

     - protect their trade secrets or know-how;

     - defend themselves against claims alleging they infringe the rights of
       others; or

                                        29


     - determine the scope and validity of the patents or intellectual property
       rights of others.

     Any litigation could result in substantial cost to Brooks and PRI and
divert the attention of their managements, which could harm their operating
results and their future operations.

BROOKS' AND PRI'S OPERATIONS COULD INFRINGE ON THE INTELLECTUAL PROPERTY RIGHTS
OF OTHERS.

     Particular aspects of Brooks' and PRI's technology could be found to
infringe on the intellectual property rights or patents of others. Other
companies may hold or obtain patents on inventions or may otherwise claim
proprietary rights to technology necessary to Brooks' and PRI's businesses.
Brooks and PRI cannot predict the extent to which they may be required to seek
licenses or alter their products so that they no longer infringe the rights of
others. Brooks and PRI cannot guarantee that the terms of any licenses they may
be required to seek will be reasonable. Similarly, changing Brooks' and PRI's
products or processes to avoid infringing the rights of others may be costly or
impractical or could detract from the value of their products. A party making a
claim of infringement could secure a judgment against Brooks or PRI that
requires it to pay substantial damages. A judgment could also include an
injunction or other court order that could prevent Brooks or PRI from selling
its products. Any claim of infringement by a third party also could cause Brooks
or PRI to incur substantial costs defending against the claim, even if the claim
is invalid, and could distract the attention of Brooks' or PRI's management. Any
of these events could seriously harm Brooks' or PRI's business.

BROOKS' BUSINESS MAY BE HARMED BY INFRINGEMENT CLAIMS OF GENERAL SIGNAL OR
APPLIED MATERIALS.

     Brooks received notice from General Signal Corporation twice in 1992 and
once in 1994 alleging certain of Brooks' tool automation systems products that
Brooks sells to semiconductor process tool manufacturers infringed General
Signal's patent rights. The notification advised Brooks that General Signal was
attempting to enforce its rights to those patents in litigation against Applied
Materials, and that, at the conclusion of that litigation, General Signal
intended to enforce its rights against Brooks and others. According to a press
release issued by Applied Materials in November 1997, Applied Materials settled
its litigation with General Signal by acquiring ownership of five General Signal
patents. Although not verified by Brooks, these five patents would appear to be
the patents referred to by General Signal in its prior notice to Brooks. Applied
Materials has not contacted Brooks regarding these patents. Brooks cannot
guarantee that it would prevail in any litigation by Applied Materials seeking
damages or expenses from Brooks or to enjoin Brooks from selling its products on
the basis of the alleged patent infringement, or that a license for any of the
alleged infringed patents will be available to Brooks on reasonable terms, if at
all. A material portion of Brooks' revenues for the quarter ended December 31,
2001 and fiscal 2001 derive from the products that General Signal originally
alleged to infringe its patents.

AN UNFAVORABLE OUTCOME OR PROLONGED LITIGATION IN A CLASS ACTION LAWSUIT FILED
AGAINST PRI COULD HARM PRI'S BUSINESS.

     PRI and three of its directors are defendants in a pending securities class
action lawsuit claiming, among other things, that the defendants violated
Sections 10(b) and 20(a) of the Securities Exchange Act of 1934 and SEC Rule
10b-5, and also Sections 11 and 15 of the Securities Act of 1933, by virtue of
statements and omissions that the plaintiffs claim were materially false or
misleading. The complaint seeks certification as a class action on behalf of
virtually all purchasers of PRI's common stock from January 27, 2000 through
September 11, 2000, and also seeks damages, pre-judgment and post-judgment
interest, costs, and attorneys' fees. A group of five persons has been appointed
as lead plaintiff, and the court has approved the group's selection of lead
counsel. PRI intends to defend against the claims vigorously. However, PRI could
incur substantial costs defending the lawsuit, has no insurance coverage
relating to these claims, and has undertaken to indemnify the individual
defendants for any losses they may suffer. With limited exceptions, Brooks has
agreed to assume PRI's indemnification obligations regarding these individual
defendants. Moreover, although PRI has established a reserve for legal costs of
$3.0 million, the reserve may be inadequate. The lawsuits could also divert the
time and attention of PRI's management. PRI cannot predict the outcome of the
lawsuits at this time, and there can be no assurance that PRI will

                                        30


not have to pay significant damages or amounts in settlement. An unfavorable
outcome or prolonged litigation in this lawsuit could materially harm PRI's
business.

BROOKS' BUSINESS MAY BE HARMED BY INFRINGEMENT CLAIMS OF ASYST TECHNOLOGIES,
INC.

     Brooks acquired certain assets, including a tracking system known as
IridNet, from the Infab division of Jenoptik AG on September 30, 1999. Asyst
Technologies, Inc. had previously filed suit against Jenoptik AG and other
defendants, claiming that products of the defendants, including IridNet,
infringe Asyst's patents. This ongoing litigation may ultimately affect certain
products sold by Brooks. Brooks has received notice that Asyst may amend its
complaint to name Brooks as an additional defendant. Based on Brooks'
investigation of Asyst's allegations, Brooks does not believe it is infringing
any claims of Asyst's patents. Brooks intends to continue to support Jenoptik to
argue vigorously, among other things, the position that the IridNet system does
not infringe the Asyst patents. If Asyst prevails in prosecuting its case, Asyst
may seek to prohibit Brooks from developing, marketing and using the IridNet
product without a license. Because patent litigation can be extremely expensive,
time-consuming, and its outcome uncertain, Brooks may seek to obtain licenses to
the disputed patents. Brooks cannot guarantee that licenses will be available to
it on reasonable terms, if at all. If a license from Asyst is not available,
Brooks could be forced to incur substantial costs to reengineer the IridNet
system, which could diminish its value. In any case, Brooks may face litigation
with Asyst. Such litigation could be costly and would divert Brooks'
management's attention and resources. In addition, even though sales of IridNet
comprised less than 1% of total revenues for fiscal year 2001, if Brooks does
not prevail in such litigation, Brooks could be forced to pay damages or amounts
in settlement. Jenoptik has indemnified Brooks for losses Brooks may incur in
this action.

PRI IS BECOMING INCREASINGLY DEPENDENT ON SUBCONTRACTORS AND ONE OR A FEW
SUPPLIERS FOR SOME COMPONENTS AND MANUFACTURING PROCESSES.

     For some products, or components or specialized processes that PRI uses in
its products, PRI depends on subcontractors or has available only one or a few
suppliers. For example, PRI's TurboStocker, AeroLoader, AeroTrak and Guardian
products each include components and assemblies for which PRI has qualified, or
for which there exists, only one supplier or a small number of suppliers. In
general, PRI does not have long-term agreements with these suppliers, or
agreements that obligate them to supply all of PRI's requirements for such
components or assemblies. Also, PRI relies on Shinsung Engineering Co. Ltd. to
manufacture its TurboStocker product for delivery in the Asian market and to
provide related customer support. PRI has a Master Engineering Services
Agreement with Shinsung, which provides the general terms and conditions under
which PRI may from time to time request that Shinsung perform engineering
projects to PRI. The scope of each project and the related price and other terms
are defined in separate statements of work to be agreed upon by PRI and
Shinsung. The agreement provides that all intellectual property created by
Shinsung in the course of any such project will belong to PRI. PRI also has a
Master Manufacturing Services Agreement with Shinsung, which provides the
general terms and conditions under which PRI may from time to time request that
Shinsung manufacture products for PRI. The specifications for any products to be
manufactured, and related price and other terms, are to be defined in one or
more separate purchase orders to be issued by PRI to Shinsung. These agreements
with Shinsung are non-exclusive, contain customary provisions entitling either
party to terminate the agreement in the event of a material breach of the
agreement by, or the insolvency of, the other party, and also may be terminated
by PRI at any time for its convenience. The agreements both expire in October
2004. PRI's reliance on subcontractors gives PRI less control over the
manufacturing process and exposes PRI to significant risks, especially
inadequate capacity, late delivery, substandard quality and high costs. PRI
intends to outsource additional aspects of its manufacturing operations to
subcontractors and suppliers. PRI could experience disruption in obtaining
products or needed components and may be unable to develop alternatives in a
timely manner. If PRI is unable to obtain adequate deliveries of products or
components for an extended period of time, PRI may have to pay more for
inventory, parts and other supplies, seek alternative sources of supply or delay
shipping products to its customers. These outcomes could damage PRI's
relationships with customers. Any such increased costs, delays in shipping or
damage to customer relationships could seriously harm PRI's business.

                                        31


     PRI's dependence on third-party suppliers could harm its ability to
negotiate the terms of its future business relationships with these parties, and
PRI may be unable to replace any of them on terms favorable to it. In addition,
outsourcing PRI's manufacturing to third parties may require PRI to share its
proprietary information with these suppliers. Although PRI enters into
confidentiality agreements with these third parties, these agreements may not
adequately protect PRI's proprietary information.

BROOKS' AND PRI'S SOFTWARE PRODUCTS MAY CONTAIN ERRORS OR DEFECTS THAT COULD
RESULT IN LOST REVENUE, DELAYED OR LIMITED MARKET ACCEPTANCE OR PRODUCT
LIABILITY CLAIMS WITH SUBSTANTIAL LITIGATION COSTS.

     Complex software products like Brooks' and PRI's can contain errors or
defects, particularly when they first introduce new products or when they
release new versions or enhancements. Any defects or errors could result in lost
revenue or a delay in market acceptance, which would seriously harm Brooks' or
PRI's business and operating results. Brooks and PRI have occasionally
discovered software errors in their new software products and new releases after
their introduction, and they expect that this will continue. Despite internal
testing and testing by current and potential customers, Brooks' and PRI's
current and future products may contain serious defects.

     Because many of Brooks' and PRI's customers use their products for
business-critical applications, any errors, defects or other performance
problems could result in financial or other damage to Brooks' and PRI's
customers and could significantly impair their operations. Brooks' and PRI's
customers could seek to recover damages from them for losses related to any of
these issues. A product liability claim brought against Brooks or PRI, even if
not successful, would likely be time-consuming and costly to defend and could
adversely affect Brooks' and PRI's marketing efforts.

BROOKS' AND PRI'S BUSINESS COULD BE HARMED IF THEY FAIL TO ADEQUATELY INTEGRATE
THE OPERATIONS OF THE BUSINESSES THEY HAVE ACQUIRED.

     Brooks and PRI have completed a number of acquisitions in a short period of
time. Brooks' and PRI's management must devote substantial time and resources to
the integration of the operations of their acquired businesses with their core
businesses and their other acquired businesses. If Brooks and PRI fail to
accomplish this integration efficiently, they may not realize the anticipated
benefits of their acquisitions. The process of integrating supply and
distribution channels, research and development initiatives, computer and
accounting systems and other aspects of the operations of their acquired
businesses presents a significant challenge to Brooks' and PRI's management.
This is compounded by the challenge of simultaneously managing larger entities.
These businesses have operations and personnel located in Asia, Europe and the
United States and present a number of additional difficulties of integration,
including:

     - assimilating products and designs into integrated solutions;

     - informing customers, suppliers and distributors of the effects of the
       acquisitions and integrating them into Brooks' and PRI's overall
       operations;

     - integrating personnel with disparate business backgrounds and cultures;

     - defining and executing a comprehensive product strategy;

     - managing geographically remote units;

     - managing the risks of entering markets or types of businesses in which
       Brooks or PRI has limited or no direct experience; and

     - minimizing the loss of key employees of the acquired businesses.

     If Brooks or PRI delays the integration or fails to integrate an acquired
business or experiences other unforeseen difficulties, the integration process
may require a disproportionate amount of Brooks management's or PRI management's
attention and financial and other resources. The proposed merger between Brooks
and PRI would exacerbate these difficulties. Brooks' and PRI's failure to
adequately address these difficulties could harm their businesses and financial
results.

                                        32


BROOKS' BUSINESS MAY BE HARMED BY ACQUISITIONS BROOKS COMPLETES IN THE FUTURE.

     Brooks plans to continue to pursue additional acquisitions of related
businesses. Brooks' identification of suitable acquisition candidates involves
risks inherent in assessing the values, strengths, weaknesses, risks and
profitability of acquisition candidates, including the effects of the possible
acquisition on Brooks' business, diversion of Brooks management's attention and
risks associated with unanticipated problems or latent liabilities. If Brooks is
successful in pursuing future acquisitions, Brooks may be required to expend
significant funds, incur additional debt or issue additional securities, which
may negatively affect Brooks' results of operations and be dilutive to its
stockholders. If Brooks spends significant funds or incurs additional debt,
Brooks' ability to obtain financing for working capital or other purposes could
decline, and Brooks may be more vulnerable to economic downturns and competitive
pressures. Brooks cannot guarantee that it will be able to finance additional
acquisitions or that it will realize any anticipated benefits from acquisitions
that Brooks completes. Should Brooks successfully acquire another business, the
process of integrating acquired operations into Brooks' existing operations may
result in unforeseen operating difficulties and may require significant
financial resources that would otherwise be available for the ongoing
development or expansion of Brooks' existing business.

THE IMPACT OF TERRORIST THREATS ON THE GENERAL ECONOMY COULD DECREASE BROOKS'
AND PRI'S REVENUES.

     On September 11, 2001, the United States was subject to terrorist attacks
at the World Trade Center buildings in New York City and the Pentagon in
Arlington, VA. The potential near- and long-term impact these attacks may have
in regards to Brooks' and PRI's suppliers and customers, markets for their
products and the U.S. economy are uncertain. There may be potential adverse
effects on their operating results due to this significant event that Brooks and
PRI cannot foresee.

NEW ACCOUNTING GUIDANCE WILL RESULT IN DELAYED RECOGNITION OF PRI'S REVENUES.

     In December 1999, the SEC issued Staff Accounting Bulletin Number 101,
which provides the SEC's guidance in applying generally accepted accounting
principles to selected revenue recognition issues. PRI implemented this guidance
in fiscal year 2001, retroactive to the first quarter. In some situations,
application of this accounting guidance delays the recognition of revenue that
would otherwise have been recognized in earlier periods. As a result, PRI's
reported revenue could fluctuate more widely in future fiscal periods, and
reported revenue for a particular fiscal period might not meet the expectations
of financial analysts or investors. A delay in recognition of revenue resulting
from application of this guidance, while not affecting PRI's cash flow, could
adversely affect its results of operations in one or more future periods, which
could cause the value of PRI's common stock to fall.

RISK FACTORS RELATING TO THE BROOKS COMMON STOCK

BROOKS' OPERATING RESULTS FLUCTUATE SIGNIFICANTLY, WHICH COULD NEGATIVELY IMPACT
ITS BUSINESS AND ITS STOCK PRICE.

     Brooks' revenues, margins and other operating results can fluctuate
significantly from quarter to quarter depending upon a variety of factors,
including:

     - the level of demand for semiconductors in general;

     - cycles in the market for semiconductor manufacturing equipment and
       automation software;

     - the timing, rescheduling, cancellation and size of orders from Brooks'
       customer base;

     - Brooks' ability to manufacture, test and deliver products in a timely and
       cost-effective manner;

     - Brooks' success in winning competitions for orders;

     - the timing of Brooks' new product announcements and releases and those of
       its competitors;

     - the mix of products it sells;

     - the timing of any acquisitions and related costs;

     - competitive pricing pressures; and

     - the level of automation required in fab extensions, upgrades and new
       facilities.

                                        33


     Brooks entered the factory automation software business in fiscal 1999. A
portion of Brooks' revenues from this business will depend on achieving project
milestones. As a result, Brooks' revenue from this business will be subject to
fluctuations depending upon a number of factors, including whether Brooks can
achieve project milestones on a timely basis, if at all, as well as the timing
and size of projects.

BROOKS' STOCK PRICE IS VOLATILE.

     The market price of the Brooks common stock has fluctuated widely. For
example, between April 4, 2001 and April 30, 2001, the closing price of Brooks'
common stock rose from approximately $35.45 to $62.61 per share and between
August 28, 2001 and September 28, 2001, the price of the Brooks common stock
dropped from approximately $48.15 to $26.59 per share. Consequently, the current
market price of the Brooks common stock may not be indicative of future market
prices, and Brooks may be unable to sustain or increase the value of an
investment in its common stock. Factors affecting Brooks' stock price may
include:

     - variations in operating results from quarter to quarter;

     - changes in earnings estimates by analysts or Brooks' failure to meet
       analysts' or investors' expectations;

     - changes in the market price per share of Brooks' public company
       customers;

     - market conditions in the industry;

     - general economic conditions;

     - low trading volume of the Brooks common stock; and

     - the number of firms making a market in Brooks common stock.

     In addition, the stock market has recently experienced extreme price and
volume fluctuations. These fluctuations have particularly affected the market
prices of the securities of high technology companies like Brooks. These market
fluctuations could adversely affect the market price of the Brooks common stock.

BECAUSE A LIMITED NUMBER OF STOCKHOLDERS, INCLUDING A MEMBER OF BROOKS'
MANAGEMENT TEAM, OWNS A SUBSTANTIAL NUMBER OF SHARES OF BROOKS COMMON STOCK AND
ARE PARTIES TO A VOTING AGREEMENT, THEIR DECISIONS MAY BE DETRIMENTAL TO YOUR
INTERESTS.

     By virtue of their stock ownership and voting agreement, Robert J.
Therrien, Brooks' president and chief executive officer, and Jenoptik AG have
the power to significantly influence Brooks' affairs and are able to influence
the outcome of matters required to be submitted to stockholders for approval,
including the election of Brooks' directors, amendments to Brooks' certificate
of incorporation, mergers, sales of assets and other acquisitions or sales.
These stockholders may exercise their influence over Brooks in a manner
detrimental to your interests. As of March 31, 2002, Mr. Therrien and M+W Zander
Holding GmbH, a subsidiary of Jenoptik AG, owned approximately 8.9% of the
Brooks common stock.

     Brooks has a stockholders agreement with Mr. Therrien, M+W Zander Holding
GmbH and Jenoptik AG under which M+W Zander Holding GmbH agreed to vote all of
its shares on all matters in accordance with the recommendation of a majority of
Brooks' board of directors.

PROVISIONS OF BROOKS' CERTIFICATE OF INCORPORATION, BYLAWS, CONTRACTS AND 4.75%
CONVERTIBLE SUBORDINATED NOTES DUE 2008 MAY DISCOURAGE TAKEOVER OFFERS AND MAY
LIMIT THE PRICE INVESTORS WOULD BE WILLING TO PAY FOR BROOKS' COMMON STOCK.

     Brooks' certificate of incorporation and bylaws contain provisions that may
make an acquisition of Brooks more difficult and discourage changes in Brooks'
management. These provisions could limit the price that investors might be
willing to pay for shares of Brooks common stock. In addition, Brooks has
adopted a shareholder rights plan. In many potential takeover situations, rights
issued under the plan become exercisable to purchase Brooks common stock at a
price substantially discounted from the then applicable market price of Brooks
common stock. Because of its possible dilutive effect to a potential acquiror,
the rights plan would generally discourage third parties from proposing a merger
with or initiating a tender offer for Brooks that is not approved by Brooks'
board of directors. Accordingly, the rights plan

                                        34


could have an adverse impact on Brooks' stockholders who might want to vote in
favor of a merger or participate in a tender offer. In addition, Brooks may
issue shares of preferred stock upon terms the board of directors deems
appropriate without stockholder approval. Brooks' ability to issue preferred
stock in such a manner could enable its board of directors to prevent changes in
its management or control. Finally, upon a change of control of Brooks, Brooks
may be required to repurchase convertible subordinated notes at a price equal to
100% of the principal outstanding amount thereof, plus accrued and unpaid
interest, if any, to the date of the repurchase. Such a repurchase of the notes
would represent a substantial cash outflow; accordingly, the repayment of the
notes upon a change of control of Brooks could discourage third parties from
proposing a merger with, initiating a tender offer for or otherwise attempting
to gain control of Brooks.

                                        35


                     ANNUAL MEETING OF BROOKS STOCKHOLDERS

GENERAL

     This joint proxy statement/prospectus is furnished in connection with the
solicitation of proxies by the Brooks board of directors for use at the annual
meeting of stockholders to be held at Brooks' principal executive offices at 15
Elizabeth Drive, Chelmsford, Massachusetts 01824, on May 13, 2002, at 10:00 a.m.
local time and at any adjournment or adjournments thereof. The enclosed proxy
relating to the annual meeting is solicited on behalf of the board of directors
of Brooks. The cost of such solicitation will be borne by Brooks, except that
Brooks and PRI will share the cost of printing and mailing this joint proxy
statement/prospectus. Brooks and PRI have retained the services of Georgeson
Shareholder Communications, Inc. to aid in the solicitation of proxies. Brooks
and PRI will share Georgeson's fees and expenses and estimate that they will pay
Georgeson a fee not to exceed $15,000 for its services, will reimburse Georgeson
for reasonable out-of-pocket expenses and will indemnify Georgeson against
losses arising out of its proxy solicitation services on their behalf. Certain
of the officers and regular employees of Brooks may solicit proxies by
correspondence, telephone or in person, without extra compensation. Georgeson
and Brooks will also make arrangements with brokerage firms, fiduciaries, and
other nominees who are record holders of Brooks common stock to forward
solicitation materials to the beneficial owners of those shares. Brooks will
reimburse those brokerage firms, fiduciaries, and other nominees for their
reasonable out-of-pocket expenses in connection with this solicitation. It is
expected that this joint proxy statement/ prospectus and the accompanying proxy
card will first be mailed to stockholders on or about April 15, 2002.

RECORD DATE

     Only stockholders of record at the close of business on April 8, 2002 will
be entitled to receive notice of, and to vote at, the annual meeting. As of that
date, there were outstanding and entitled to vote approximately 20,268,244
shares of Brooks common stock. Each such stockholder is entitled to one vote for
each share of common stock so held and may vote such shares either in person or
by proxy.

MATTERS TO BE CONSIDERED AT THE ANNUAL MEETING

     At the annual meeting and any adjournment or postponement of the annual
meeting, Brooks stockholders will be asked to vote upon the following proposals:

     - to approve the issuance of shares of Brooks common stock in the
       acquisition of PRI in accordance with the merger agreement;

     - to grant Brooks' management the discretionary authority to adjourn the
       annual meeting to a date or dates not later than June 7, 2002, if
       necessary to enable Brooks' management to solicit additional proxies in
       favor of the merger proposal or the proposal to increase Brooks'
       authorized common stock;

     - to elect five members to the board of directors;

     - if the merger proposal is approved, to approve the amendment of Brooks'
       certificate of incorporation to increase the number of authorized shares
       of common stock from 43,000,000 to 100,000,000. Even if this proposal is
       approved, the amendment to the certificate of incorporation will only
       take effect if the merger is completed;

     - if the merger proposal is approved, to approve the amendment of the
       Brooks' 1995 employee stock purchase plan to increase the number of
       shares reserved for issuance under the plan from 750,000 to 1,500,000.
       Even if this proposal is approved, the amendment to the employee stock
       purchase plan will only take effect if the merger is completed;

     - to approve the amendment of Brooks' 1993 nonemployee director stock
       option plan (i) if the merger proposal is approved, to increase the
       number of shares reserved for issuance under the plan from 190,000 to
       690,000 and to effect additional changes relating to grants of options
       under that plan, or (ii) if the merger proposal is not approved, to
       increase the number of shares reserved for issuance under the plan from
       190,000 to 490,000; and

                                        36


     - to approve the amendment of Brooks' 2000 combination stock option plan
       (i) if the merger proposal is approved, to increase the number of shares
       reserved for issuance under the plan from 1,000,000 to 6,000,000, or (ii)
       if the merger proposal is not approved, to increase the number of shares
       reserved for issuance under the plan from 1,000,000 to 3,000,000.

     Brooks stockholders will also consider any other matters that may properly
come before the annual meeting or any adjournment or postponement of the annual
meeting.

BOARD OF DIRECTORS' RECOMMENDATION

     The Brooks board of directors recommends that Brooks' stockholders vote FOR
the issuance of the shares of Brooks common stock in connection with the merger,
FOR the election of five directors to Brooks' board, FOR the adjournment
proposal and FOR all the other proposals contained in Brooks' notice of annual
meeting.

QUORUM; VOTES REQUIRED; TABULATION

     A quorum, consisting of a majority of shares of all stock issued,
outstanding and entitled to vote at the annual meeting, will be required to be
present in person or by proxy for the transaction of business at the annual
meeting and any adjournment thereof. If a quorum is not present, a majority of
the votes properly cast will adjourn the meeting.

     The affirmative vote of the holders of a majority of the shares of Brooks
common stock present in person or represented by proxy at the annual meeting and
entitled to vote is required to approve the issuance of Brooks common stock in
connection with the merger, the adjournment proposal and the amendments to the
stock purchase and option plans.

     The affirmative vote of the holders of a majority of all outstanding shares
of Brooks common stock is required to approve the amendment to Brooks'
certificate of incorporation.

     The five nominees for directors who receive the greatest number of votes
cast by stockholders present in person or represented by proxy at the annual
meeting and entitled to vote thereon will be elected directors of Brooks.

     Abstentions will have no effect on the outcome of the vote for the election
of directors, but will have the same effect as votes cast against the other
proposals, even though the stockholder so abstaining intends a different
interpretation. Shares of Brooks common stock held of record by brokers who do
not return a signed and dated proxy or do not comply with the Internet or
telephone voting instructions will not be considered present at the annual
meeting, will not be counted towards a quorum, and will not be voted on any of
the proposals or in the election of directors. Shares of common stock held of
record by brokers who return a signed and dated proxy or comply with the
Internet or telephone voting instructions but who fail to vote, known as a
"broker nonvote", will count toward the quorum and will have the same effect as
votes cast against the proposal to amend Brooks' certificate of incorporation
but will have no effect on the election of directors or the other proposals
because it will not be considered a vote entitled to be cast.

     It may be necessary to adjourn or postpone the annual meeting. If a quorum
is not present at the annual meeting, Brooks' management will propose to adjourn
the meeting to a later date to enable it to solicit additional proxies, and a
majority of the votes cast on such proposal will be required to approve it. If a
quorum is present, but the number of shares voting in favor of the merger
proposal or the proposal to increase Brooks' authorized common stock is
insufficient to approve the proposal, then, if the adjournment proposal has
received the affirmative vote of the holders of a majority of the shares of
Brooks common stock present in person or represented by proxy at the annual
meeting, Brooks' management will have the discretion to adjourn the annual
meeting to a date or dates not later than June 7, 2002 to provide Brooks'
management additional time to solicit proxies in favor of the proposals.

     The votes of stockholders present in person or represented by proxy at the
annual meeting will be tabulated by an inspector of elections appointed by
Brooks.

                                        37


STOCK OWNERSHIP OF MANAGEMENT AND CERTAIN STOCKHOLDERS

     As of March 31, 2002, the directors and executive officers of Brooks
collectively owned approximately 5.4% of the shares of Brooks common stock
outstanding on that date. These directors and executive officers have entered
into voting agreements with PRI in which they have agreed, among other things,
to vote all Brooks shares over which they have voting power to approve the
issuance of shares of Brooks common stock in connection with the merger, and all
agreements and actions related to the merger. Brooks is party to a stockholder
agreement with Robert J. Therrien, M+W Zander Holding GmbH and Jenoptik AG under
which M+W agreed to vote all its shares of Brooks common stock on all matters in
accordance with the recommendation of a majority of the Brooks board of
directors. Giving effect to this stockholder agreement and the voting
agreements, as of March 31, 2002, holders of an aggregate total of approximately
9.3% of Brooks common stock have agreed to vote in favor of the merger. See
"Related Agreements -- Voting Agreements" beginning on page 91 and "Certain
Relationships and Related Transactions of Brooks -- Jenoptik Stockholder
Agreement" beginning on page 145.

VOTING OF PROXIES; REVOCATION OF PROXIES

     General.  Shares represented by a proxy will be voted at the annual meeting
as specified in the proxy.

     Proxies without voting instructions.  Proxies that are properly signed and
dated but which do not contain voting instructions will be voted FOR each of the
proposals.

     Voting shares held through broker by proxy.  If your shares of Brooks
common stock are held by your broker, your broker will vote your shares for you
if you provide instructions to your broker on how to vote your shares. You
should follow the directions provided by your broker regarding how to instruct
your broker to vote your shares. Your broker generally cannot vote your shares
without specific instructions from you. If a proposal requires the affirmative
vote of a majority of the outstanding shares of Brooks common stock to be
approved, your failure to instruct your broker how to vote will have the same
effect as a vote against that proposal.

     Voting of shares held through broker in person.  If your shares of Brooks
common stock are held by your broker and you wish to vote those shares in person
at the annual meeting, you must obtain from the nominee holding your shares a
properly executed legal proxy, identifying you as a Brooks stockholder,
authorizing you to act on behalf of the nominee at the annual meeting and
specifying the number of shares with respect to which the authorization is
granted.

     Other matters.  If you sign and return the enclosed proxy card, you grant
to the persons named in the proxy the authority to vote in their discretion on
any other matters that may properly come before the annual meeting or any
adjournment or postponement of the annual meeting. Brooks' management does not
presently know of any other matters to be brought before the annual meeting.
Other matters that may be properly brought before the annual meeting, unless
otherwise provided in Brooks' certificate of incorporation or bylaws or by
Delaware law, will be approved if they receive the affirmative vote of the
holders of a majority of the shares of Brooks common stock present in person or
represented by proxy at the annual meeting.

REVOCATION OF PROXIES

     Signing the enclosed proxy card will not prevent a record holder from
voting in person at the Brooks annual meeting or otherwise revoking the proxy. A
record holder may revoke a proxy at any time before the annual meeting in the
following ways:

     - filing with Brooks' corporate secretary, before the vote at the annual
       meeting, a written notice of revocation bearing a later date than the
       proxy;

     - authorizing a later dated proxy (by executing a proxy, or by making an
       authorized Internet or telephone communication) relating to the same
       shares and delivering it to Brooks before the vote at the annual meeting;
       or

                                        38


     - attending the annual meeting and voting in person, although attendance at
       the meeting will not by itself constitute a revocation of the proxy.

     Record holders should send any written notice of revocation or subsequent
proxy to Brooks' corporate secretary at 15 Elizabeth Drive, Chelmsford,
Massachusetts 01824, or fax at (978) 262-2500, or hand deliver the notice of
revocation or subsequent proxy to Brooks' corporate secretary before the vote at
the Brooks annual meeting.

INDEPENDENT ACCOUNTANTS

     The board of directors has appointed PricewaterhouseCoopers LLP as the
independent accountants to audit Brooks' consolidated financial statements for
the fiscal year ending September 30, 2002. Such firm and its predecessor have
served continuously in that capacity since 1989.

     A representative of PricewaterhouseCoopers LLP will be at the annual
meeting and will be given an opportunity to make a statement, if so desired. The
representative will be available to respond to appropriate questions.

SECTION 16(a) BENEFICIAL OWNERSHIP REPORTING COMPLIANCE

     Section 16(a) of the Securities Exchange Act of 1934 requires Brooks'
executive officers and directors, and persons who own more than 10% of Brooks'
common stock, to file reports of ownership and changes in ownership on Forms 3,
4 and 5 with the SEC. Executive officers, directors and greater than 10%
stockholders are required to furnish Brooks with copies of all Forms 3, 4 and 5
they file.

     Based solely on Brooks' review of the copies of such forms it has received
and written representations from certain reporting persons that they were not
required to file Forms 5 for the fiscal year ended September 30, 2001, Brooks
believes that all of its executive officers, directors and greater than 10%
stockholders complied with all Section 16(a) filing requirements applicable to
them during Brooks' fiscal year ended September 30, 2001.

STOCKHOLDER PROPOSALS

     Proposals which Brooks stockholders intend to present at Brooks' 2003
annual meeting of stockholders and wish to have included in Brooks' proxy
materials pursuant to Rule 14a-8 promulgated under the Securities Exchange Act
of 1934, must be received by Brooks no later than September 1, 2002. If a
proponent fails to notify Brooks by August 15, 2002 of a non-Rule 14a-8
stockholder proposal which it intends to submit at Brooks' 2003 annual meeting
of stockholders, the proxy solicited by the board of directors with respect to
that meeting may grant discretionary authority to the person named in each proxy
to vote with respect to that matter.

INCORPORATION BY REFERENCE

     To the extent that this joint proxy statement/prospectus has been or will
be specifically incorporated by reference into any filing by Brooks under the
Securities Act of 1933 or the Securities Exchange Act of 1934 the sections of
the joint proxy statement/prospectus entitled "Audit Committee Report,"
"Compensation Committee Report" and "Performance Graph" shall not be deemed to
be so incorporated, unless specifically otherwise provided in any such filing.

ANNUAL REPORT ON FORM 10-K

     COPIES OF BROOKS' ANNUAL REPORT ON FORM 10-K/A FOR THE FISCAL YEAR ENDED
SEPTEMBER 30, 2001 AS FILED WITH THE SEC ARE BEING MAILED TO BROOKS STOCKHOLDERS
OF RECORD WITH THIS JOINT PROXY STATEMENT/ PROSPECTUS AND ARE AVAILABLE TO
BROOKS STOCKHOLDERS WITHOUT CHARGE UPON WRITTEN REQUEST ADDRESSED TO INVESTOR
RELATIONS, BROOKS AUTOMATION, INC., 15 ELIZABETH DRIVE, CHELMSFORD,
MASSACHUSETTS 01824.

                                        39


                      SPECIAL MEETING OF PRI STOCKHOLDERS

MATTERS FOR CONSIDERATION

     The PRI special meeting of stockholders is scheduled to be held on May 13,
2002 at the offices of Foley, Hoag & Eliot LLP, One Post Office Square,
Sixteenth Floor, Boston, Massachusetts 02109, commencing at 2:00 p.m., local
time, to consider and vote upon:

     - a proposal to approve and adopt the merger agreement;

     - a proposal to grant PRI's management the discretionary authority to
       adjourn the special meeting to a date or dates not later than June 7,
       2002, if necessary to enable PRI's management to solicit additional
       proxies in favor of the merger proposal; and

     - a proposal to approve an amendment to PRI's 2000 employee stock purchase
       plan to increase the maximum number of shares of PRI common stock that
       may be issued under the plan from 350,000 to 850,000.

     PRI stockholders will also consider any other matters that may properly
come before the special meeting or any adjournment or postponement of the
special meeting.

BOARD OF DIRECTORS' RECOMMENDATION

     After careful consideration, PRI's board of directors has unanimously
approved the merger and the merger agreement and recommends a vote FOR the
proposal to approve and adopt the merger agreement, FOR the adjournment proposal
and FOR the proposal to approve the amendment to PRI's 2000 employee stock
purchase plan.

PRI CANADA EXCHANGEABLE SHARES

     PRI has outstanding two classes of stock eligible to vote at the PRI
special meeting, the PRI common stock and the PRI special voting share. PRI
issued the PRI special voting share in 1999 in connection with its acquisition
of PRI Canada. As part of that acquisition, PRI Canada issued its own
exchangeable shares to the former registered holders of its common shares, and
PRI simultaneously entered into contractual and other arrangements intended to
ensure that the PRI Canada exchangeable shares are economically equivalent to,
and have the same voting power as, shares of PRI common stock.

     The PRI special voting share provides the mechanism by which the registered
holders of PRI Canada exchangeable shares exercise voting rights with respect to
PRI. The PRI special voting share votes together with the PRI common stock on
all matters to be submitted for a vote of stockholders at the PRI special
meeting and has a number of votes equal to the number of PRI Canada exchangeable
shares issued and outstanding on the record date and held by persons other than
PRI or a subsidiary of PRI. Accordingly, by virtue of the PRI special voting
share, registered holders of PRI Canada exchangeable shares effectively have the
same voting rights as holders of PRI common stock.

     In order for a registered holder of PRI Canada exchangeable shares to
exercise his or her voting rights, the registered holder must provide voting
instructions to the trustee under the PRI Canada voting and exchange trust
agreement. The trustee is the record holder of the PRI special voting share.
Each registered holder of a PRI Canada exchangeable share on the record date,
other than PRI or a subsidiary of PRI, will be entitled to one vote for each
exchangeable share held by the holder. The trustee will exercise each vote
attached to the PRI special voting share only as directed by the relevant
registered holder of PRI Canada exchangeable shares and, in the absence of
voting instructions from a registered holder, will not exercise the votes of
that registered holder. A registered holder of PRI Canada exchangeable shares
may, upon instructing the trustee, obtain a proxy from the trustee entitling the
registered holder to vote directly at the PRI special meeting the votes attached
to the PRI special voting share to which the registered holder is entitled.

                                        40


     In order to provide voting instructions to the trustee, a registered holder
of PRI Canada exchangeable shares should complete the direction attached to the
information statement accompanying this joint proxy statement/prospectus and
return it to the trustee at the address provided in that form.

     When discussing voting at the PRI special meeting elsewhere in this joint
proxy statement/prospectus, we treat PRI Canada exchangeable shares issued and
outstanding and held by persons other than PRI or a subsidiary of PRI as if they
were issued and outstanding shares of PRI common stock, and we generally do not
distinguish between PRI Canada exchangeable shares and shares of PRI common
stock. Accordingly, unless the context otherwise requires, references to the
number of shares of PRI common stock outstanding, or the number required to
establish a quorum or the passage of any vote at the PRI special meeting,
include the PRI Canada exchangeable shares.

RECORD DATE

     The record date for determining the PRI stockholders entitled to vote at
the special meeting is April 8, 2002. Only holders of record as of the close of
business on that date are entitled to receive notice of the special meeting and
to vote at the special meeting. Each share of PRI common stock entitles the
holder to one vote on each proposal and on all other matters properly brought
before the special meeting. As of the close of business on the record date,
there were approximately 26,055,705 shares of PRI common stock (including PRI
Canada exchangeable shares) outstanding and eligible to vote at the special
meeting.

QUORUM; VOTE REQUIRED; TABULATION OF VOTES

     In order to conduct business at the special meeting of stockholders of PRI,
a quorum must be present. A majority in interest of all PRI stock issued and
outstanding and entitled to vote at the meeting, whether present in person or
represented by proxy, will constitute a quorum for the transaction of business
at the special meeting. PRI will treat shares of PRI common stock represented by
a properly signed and returned proxy as present at the special meeting for
purposes of determining the existence of a quorum at the meeting. In general,
PRI will count abstentions and broker nonvotes as present or represented for
purposes of determining the existence of a quorum. A nonvote occurs when a
broker or nominee holding shares for a beneficial owner votes on one proposal,
but does not vote on another proposal because the broker or nominee does not
have discretionary voting power and has not received instructions from the
beneficial owner with respect to that proposal.

     A majority of the outstanding shares of PRI common stock must be voted for
the proposal to approve and adopt the merger agreement in order for the proposal
to pass. Abstentions and broker nonvotes will have the same effect as votes
against this proposal.

     The proposal to grant PRI's management the discretionary authority to
adjourn the special meeting and the proposal to approve the amendment to PRI's
2000 employee stock purchase plan will each require a majority of the votes
properly cast on the proposal at the special meeting. Abstentions and broker
nonvotes will not count as votes cast on either proposal and, accordingly, will
not affect the outcome of the vote on these proposals.

     It may be necessary to adjourn or postpone the special meeting. If a quorum
is not present at the special meeting, PRI management will propose to adjourn
the meeting to a later date to enable PRI's management to solicit additional
proxies, and a majority of the votes cast on that proposal will be required to
approve it. If a quorum is present, but the number of shares voting in favor of
the approval and adoption of the merger agreement is insufficient to approve the
proposal under Massachusetts law, then, if the adjournment proposal has received
a majority of the votes properly cast on the proposal at the special meeting,
PRI's management will have the discretion to adjourn the special meeting to a
date or dates not later than June 7, 2002 to provide PRI's management additional
time to solicit proxies in favor of the merger proposal.

                                        41


     PRI's transfer agent, EquiServe, will tabulate the votes on each proposal.
EquiServe will tabulate separately the votes on each matter submitted to
stockholders.

VOTING OF PROXIES

     General.  Shares represented by a proxy will be voted at the special
meeting as specified in the proxy.

     Proxies without voting instructions.  Proxies that are properly signed and
dated but which do not contain voting instructions will be voted FOR the
approval and adoption of the merger agreement, FOR the grant to PRI's management
of discretionary authority to adjourn the special meeting and FOR the approval
of the amendment to PRI's 2000 employee stock purchase plan.

     Voting shares held through broker by proxy.  If your shares of PRI common
stock are held by your broker, your broker will vote your shares for you if you
provide instructions to your broker on how to vote your shares. You should
follow the directions provided by your broker regarding how to instruct your
broker to vote your shares. Your broker generally cannot vote your shares
without specific instructions from you. Because the affirmative vote of a
majority of the outstanding shares of PRI common stock is required to approve
and adopt the merger agreement, your failure to instruct your broker how to vote
will have the same effect as a vote against approval and adoption of the merger
agreement.

     Voting of shares held through broker in person.  If your shares of PRI
common stock are held by your broker and you wish to vote those shares in person
at the special meeting, you must obtain from the nominee holding your shares a
properly executed legal proxy, identifying you as a PRI stockholder, authorizing
you to act on behalf of the nominee at the special meeting and specifying the
number of shares with respect to which the authorization is granted.

     Other matters.  If you sign and return the enclosed proxy card, you grant
to the persons named in the proxy the authority to vote in their discretion on
any other matters that may properly come before the special meeting or any
adjournment or postponement of the special meeting. PRI's management does not
presently know of any other matters to be brought before the special meeting.
Other matters that may be properly brought before the special meeting, unless
otherwise provided in PRI's charter or bylaws or by Massachusetts law, will be
approved if they receive a majority of the votes properly cast on the matter.

HOW TO REVOKE A PROXY

     Signing the enclosed proxy card will not prevent a record holder from
voting in person at the PRI special meeting or otherwise revoking the proxy. A
record holder may revoke a proxy at any time before the special meeting in the
following ways:

     - filing with PRI's clerk, before the vote at the special meeting, a
       written notice of revocation bearing a later date than the proxy;

     - executing a later dated proxy relating to the same shares and delivering
       it to PRI before the vote at the special meeting; or

     - attending the special meeting and voting in person, although attendance
       at the meeting will not by itself constitute a revocation of the proxy.

     Record holders should send any written notice of revocation or subsequent
proxy to PRI's corporate clerk at 805 Middlesex Turnpike, Billerica,
Massachusetts 01821, or fax at (978) 663-9755, or hand deliver the notice of
revocation or subsequent proxy to PRI's clerk before the vote at the PRI special
meeting.

SOLICITATION OF PROXIES AND EXPENSES

     The solicitation of proxies from PRI stockholders is made on behalf of the
board of directors of PRI. PRI will pay all costs of the solicitation of its
stockholders, except that PRI and Brooks will share the cost of printing and
mailing this joint proxy statement/prospectus and the form of proxy card. PRI
and Brooks

                                        42


have retained Georgeson Shareholder Communications Inc. to assist in the
solicitation of proxies. PRI and Brooks will share Georgeson's fees and expenses
and estimate they will pay Georgeson a fee not to exceed $15,000, plus
reimbursement of specified out-of-pocket expenses, and will indemnify Georgeson
against losses arising out of its proxy solicitation services on their behalf.
In addition to solicitation by mail, Georgeson and PRI may request that PRI's
directors, officers or employees solicit proxies from stockholders by telephone,
in person or by other means. These persons will not receive additional
compensation, although they will be reimbursed for the reasonable out-of-pocket
expenses they incur in connection with this solicitation. Georgeson and PRI will
also make arrangements with brokerage firms, fiduciaries, and other nominees who
are record holders of PRI common stock to forward solicitation materials to the
beneficial owners of those shares. PRI will reimburse those brokerage firms,
fiduciaries, and other nominees for their reasonable out-of-pocket expenses in
connection with this solicitation.

STOCK HELD BY PRI DIRECTORS AND EXECUTIVE OFFICERS

     As of March 31, 2002, the directors and executive officers of PRI owned a
total of 1,231,955 shares of PRI common stock. These shares represented
approximately 4.7% of the shares of PRI common stock outstanding on that date.
These directors and executive officers have entered into voting agreements with
Brooks in which they agreed, among other things, to vote all PRI shares over
which they have voting power to approve and adopt the merger agreement, the
merger and all agreements and actions related to the merger. For a more complete
description of the voting agreements, see "Related Agreements -- Voting
Agreements" beginning on page 91.

APPRAISAL OR DISSENTERS' RIGHTS

     The following is a summary of Sections 85 through 98 of the Massachusetts
Business Corporation Law, which set forth the procedures that PRI stockholders
must follow in order to object to the proposal to approve and adopt the merger
agreement and demand statutory appraisal rights. The full text of Sections 85
through 98 is included as Appendix B to this joint proxy statement/prospectus.
Failure to follow those provisions exactly could result in the loss of your
appraisal rights. See "Material Federal Income Tax Considerations" beginning on
page 73 for a discussion of the tax consequences of exercising appraisal rights.

     PRI stockholders who desire to exercise their appraisal rights must satisfy
each of the applicable conditions of Sections 85 through 98. The stockholder
must file with PRI, before the vote on the proposal relating to the merger
agreement is taken, a written objection to the proposed merger agreement that
states that the stockholder intends to demand payment for his, her or its
shares. The written objection should be filed with the corporate clerk of PRI at
PRI Automation, Inc., 805 Middlesex Turnpike, Billerica, Massachusetts 01821.
The written objection must specify the stockholder's name and mailing address,
that the stockholder objects to the proposal regarding the merger agreement and
that he, she or it is demanding appraisal of his, her or its shares of PRI
common stock.

     PRI stockholders electing to exercise their appraisal rights must not vote
for approval of the merger agreement. If a stockholder returns a signed proxy
but does not specify a vote against approval of the merger agreement or a
direction to abstain, the proxy will be voted FOR approval of the merger
agreement, which will have the effect of waiving that stockholder's appraisal
rights. Also, voting against, abstaining from voting, or failing to vote with
respect to the merger agreement alone will not constitute a demand for appraisal
for purposes of Massachusetts law.

     Within 10 days after the merger becomes effective, PRI must notify by
registered or certified mail each stockholder who has satisfied the requirements
for demanding appraisal that the merger has become effective. The notice from
PRI will not create any rights in its recipient to demand payment for his, her
or its shares of PRI common stock.

     If, within 20 days after the date PRI mails the notice, any stockholder to
whom PRI was required to give notice demands in writing payment from PRI for
his, her or its shares of PRI common stock, PRI, within 50 days after the date
it mailed the notice, must contact such objecting stockholder regarding the
                                        43


fair value of such objecting stockholder's shares. These written demands may be
filed with PRI c/o Brooks-PRI Automation, Inc., 15 Elizabeth Drive, Chelmsford,
Massachusetts 01824, attention chief financial officer. If PRI and the objecting
stockholder are unable to agree upon the value of the PRI common stock prior to
the expiration of the 50 day period, either party may, within four months after
the expiration of the 50 day period, demand a determination of the value of the
shares of PRI common stock of all such objecting stockholders by filing a bill
in equity in the superior court in Middlesex County.

     Any objecting stockholder who decides to file a bill in equity must do so
on his, her or its own behalf and on behalf of all other objecting stockholders
who have demanded payment for their shares and with whom PRI has not reached an
agreement as to the value of the shares. Service of the bill must be made upon
PRI by subpoena with a copy of the bill included. PRI must file with its answer
a duly verified list of all other objecting stockholders, and the objecting
stockholders will then be deemed to have been added as parties to the bill. PRI
will then give notice in the form, and returnable on the date, ordered by the
court to each objecting stockholder by registered or certified mail to the last
known address as shown in the records of PRI and by publication or otherwise as
the court may order.

     After a hearing, the court will enter a decree determining the fair value
of the PRI common stock owned by the objecting stockholders who have become
entitled to the valuation of and payment for their shares and will order PRI to
make payment, together with interest, if any, to the objecting stockholders
entitled thereto upon the transfer by them of the certificates representing
their shares of PRI common stock if certificated or, if uncertificated, upon
receipt of an instruction to transfer such stock to PRI. The value of the shares
will be determined as of the day preceding the date of the stockholder vote
approving and adopting the merger agreement and will exclude any element of
value arising from the expectation or accomplishment of the merger.

     The costs associated with the bill in equity, exclusive of fees of counsel
and experts retained by any party, will be taxed upon the parties to the bill as
the court deems equitable. All costs associated with giving notice to
stockholders, however, will be borne by PRI. Interest will be paid on any award
from the date of the vote approving the merger agreement and the court may, upon
application of any party, determine the amount of interest to be paid.

     Any objecting stockholder who has demanded payment for his, her or its
shares of PRI common stock will not thereafter be entitled to notice of any
stockholders' meeting, to vote such shares for any purpose or to receive any
dividends or distributions on the stock (except dividends or distributions
payable to stockholders of record as of a date before the date of the vote
approving the merger agreement) unless:

     - a bill in equity to determine the fair value of the PRI common stock is
       not filed within the statutory time period;

     - a bill in equity, if filed, has been dismissed as to such stockholder; or

     - such stockholder has, with the written approval of PRI, delivered a
       written withdrawal of his, her or its objections and an acceptance of the
       merger.

     The enforcement by an objecting stockholder of his, her or its right to
receive payment for his, her or its shares in this manner will be an exclusive
remedy, except that the stockholder may still bring or maintain an appropriate
proceeding to obtain relief on the ground that the merger will be or is illegal
or fraudulent, or that the merger involved a breach of fiduciary duty.

                                        44


                         BROOKS AND PRI PROPOSAL NO. 1

                  APPROVAL OF ADOPTION OF THE MERGER AGREEMENT
                                 AND THE MERGER

                                   THE MERGER

     This section of the joint proxy statement/prospectus describes material
aspects of the proposed merger, including the merger agreement which is attached
as Appendix A to this joint proxy statement/prospectus and incorporated herein
by reference. While Brooks and PRI believe that this description covers the
material terms of the merger and the related transactions, this summary may not
contain all of the information that is important to you. You should read the
entire merger agreement and the other documents we refer to carefully and in
their entirety for a more complete understanding of the merger.

     The parties entered into the merger agreement on October 23, 2001. The
parties amended and restated the merger agreement on December 18, 2001. In this
joint proxy statement/prospectus, we often refer to the merger agreement, which
means the amended and restated merger agreement dated December 18, 2001.
Similarly, we often refer to the merger, which, unless the context otherwise
requires, refers to the merger of Pontiac Acquisition Corp., a wholly owned
subsidiary of Brooks, with and into PRI, and the immediate subsequent merger of
PRI with and into Brooks. Brooks will be the sole surviving corporation.

THE MERGER

     Pontiac Acquisition Corp., a wholly owned subsidiary of Brooks, will merge
with and into PRI. As a result of the merger, Pontiac Acquisition Corp. will
cease to exist. Upon completion of that merger:

     - PRI will be merged with and into Brooks and will cease to exist as a
       separate entity;

     - each outstanding share of PRI common stock, except for dissenting shares,
       will automatically be converted into the right to receive 0.52 shares of
       Brooks common stock in the manner described below;

     - each outstanding option and warrant to purchase PRI common stock will
       automatically be converted into the right to acquire, on the same terms
       and conditions, a number of shares of Brooks common stock at a price
       based on the same conversion ratio as the PRI common stock; and

     - the rights of former PRI stockholders as Brooks stockholders will be
       governed by Brooks' certificate of incorporation and bylaws and by
       Delaware law.

CLOSING OF THE MERGER

     The merger will become effective when Pontiac Acquisition Corp. and PRI
file articles of merger with the Secretary of State of the Commonwealth of
Massachusetts. Brooks and PRI are working toward completing the merger as soon
as possible and expect to complete the merger in May 2002. However, the merger
is subject to various conditions, and we cannot predict the exact timing.

CONVERSION OF PRI SHARES IN THE MERGER

     At the effective time of the merger, each outstanding share of PRI common
stock, except for dissenting shares, will automatically be converted into the
right to receive 0.52 shares of Brooks common stock. The number of shares of
Brooks common stock issuable in the merger will be proportionately adjusted as
appropriate for any stock split, stock dividend or similar event with respect to
Brooks common stock or PRI common stock effected between the date of the merger
agreement and the completion of the merger.

                                        45


OWNERSHIP OF BROOKS COMMON STOCK FOLLOWING THE MERGER

     As a result of the merger, holders of PRI common stock will become holders
of Brooks common stock. Assuming that no options, warrants or other rights to
purchase PRI common stock are exercised before the closing of the merger, Brooks
will issue approximately 13,528,000 shares of Brooks common stock to PRI
stockholders in the merger. Following the merger, existing Brooks stockholders
will own approximately 60%, and former PRI stockholders, including the holders
of PRI Canada exchangeable shares, will own approximately 40%, of the combined
company. This calculation of the percentage ownership of Brooks common stock
following the merger is based on each company's capitalization as of March 31,
2002. Brooks will reserve an additional 3,278,605 shares of Brooks common stock
for issuance upon the exercise of options, warrants and other rights to purchase
shares of PRI common stock, which will be assumed by Brooks and converted to
options, warrants or other rights to purchase shares of Brooks common stock and
upon exchange, redemption or repurchase of PRI Canada exchangeable shares.

MATERIAL CONTACTS BETWEEN BROOKS AND PRI

     Brooks and PRI do not know of any past, present or proposed material
contracts, arrangements, understandings, relationships, negotiations or
transactions between Brooks or its affiliates and PRI or its affiliates, other
than the following:

     - the merger agreement discussed in "The Merger -- Background of the
       Merger," on page 48 resulting from the discussions and negotiations
       during the period from July 16, 2001 through October 23, 2001 between
       Brooks and PRI concerning the feasibility of a strategic business
       combination between the companies;

     - the employment agreement between Brooks and Mitchell G. Tyson and the
       voting agreements between Brooks and the executive officers and directors
       of PRI, and between PRI and the executive officers and directors of
       Brooks discussed under "Related Agreements" on page 91; and

     - a letter of intent between Brooks and a privately held software company
       relating to the proposed acquisition by Brooks of certain assets of the
       company. Kenneth Thompson, a director of PRI who will be appointed to the
       board of Brooks upon completion of the merger, also serves as president
       and CEO of the software company, which provides intelligent
       infrastructure solutions. Brooks is in the process of completing its due
       diligence and the parties are currently negotiating the asset purchase
       transaction. Brooks has advanced $2.0 million in cash to the company as
       consideration for certain of the assets subject to the letter of intent.
       Brooks cannot guarantee that this transaction will be completed on
       acceptable terms, if at all.

DELISTING AND DEREGISTRATION OF PRI COMMON STOCK AFTER THE MERGER

     If the merger is completed, the PRI common stock will be delisted from the
Nasdaq National Market and will be deregistered under the Securities Exchange
Act.

PRI STOCK OPTIONS AND WARRANTS

     Immediately prior to the effective time of the merger, each outstanding
option or warrant to purchase shares of PRI common stock will be assumed by
Brooks, regardless of whether the options and warrants are then exercisable, and
will be converted into options or warrants, as the case may be, to purchase
Brooks common stock. Each assumed PRI stock option and warrant will have the
same terms and conditions as it had immediately prior to the effective time of
the merger, and will constitute an option or warrant to acquire that number of
shares of Brooks common stock equal to the number of shares of PRI common stock
purchasable under such option or warrant multiplied by 0.52 (rounded down to the
nearest whole share), at a price per share equal to the exercise price for the
shares of PRI common stock purchasable under such PRI stock option or warrant
immediately prior to the effective time divided by 0.52 (rounded up to the
nearest whole cent).

                                        46


     The parties intend for the PRI stock options assumed by Brooks to qualify
as incentive stock options to the extent the stock options qualified as
incentive stock options prior to the effective time of the merger.

TREATMENT OF RIGHTS UNDER PRI'S EMPLOYEE STOCK PURCHASE PLAN

     If the merger is completed during an offering period under PRI's 2000
employee stock purchase plan, the offering period will terminate on the day
before the merger is completed. In that case, PRI common stock will be issued to
the stock purchase plan participants the day before the effective date of the
merger. On the effective date of the merger, any shares of PRI common stock
which were acquired under the stock purchase plan will be treated the same as
any other shares of PRI common stock and, accordingly, each such share, other
than dissenting shares, will be converted automatically into the right to
receive 0.52 shares of Brooks common stock, and Brooks will pay cash in lieu of
fractional shares.

TREATMENT OF PRI CANADA EXCHANGEABLE SHARES

     At the effective time of the merger, each outstanding PRI Canada
exchangeable share will automatically become exchangeable for 0.52 shares of
Brooks common stock. The holders of PRI Canada exchangeable shares are not
entitled to a separate class vote on the merger proposal. In addition, the PRI
special voting share will be converted automatically into a Brooks special
voting share carrying a number of votes at meetings of Brooks stockholders equal
to the number of outstanding PRI Canada exchangeable shares (other than those
held by Brooks or any of its subsidiaries) multiplied by 0.52.

     The PRI Canada exchangeable shares are currently listed on the Toronto
Stock Exchange. The Toronto Stock Exchange has conditionally approved the
continued listing of such shares following the merger, subject to compliance
with the filing and other requirements of such exchange. There is currently no
established trading market for the exchangeable shares in the United States.

     Upon the effectiveness of the merger, the name of PRI Canada will be
changed to "Brooks-PRI Automation (Canada), Inc." Registered holders of PRI
Canada exchangeable shares will be sent a letter of transmittal following
completion of the merger for the purpose of exchanging their existing
exchangeable share certificates for replacement share certificates evidencing
the same number of exchangeable shares of Brooks-PRI Automation (Canada), Inc.
Holders of PRI Canada exchangeable shares should not submit their stock
certificates for exchange until they have received the letter of transmittal and
instructions.

THE EXCHANGE AGENT

     As of the effective time of the merger, Brooks is required to deposit with
EquiServe Trust Company, N.A., the exchange agent for the merger, certificates
representing the shares of Brooks common stock to be exchanged for shares of PRI
common stock and cash to pay for fractional shares and any dividends or
distributions that holders of PRI common stock may be entitled to receive under
the merger agreement.

EXCHANGE OF PRI STOCK CERTIFICATES FOR BROOKS STOCK CERTIFICATES

     Promptly after the effective time of the merger, EquiServe Trust Company,
N.A. will mail to PRI stockholders a letter of transmittal and instructions for
surrendering their PRI stock certificates in exchange for Brooks stock
certificates. PRI stockholders should not submit their stock certificates for
exchange until they have received the letter of transmittal and instructions.

TRANSFER OF OWNERSHIP; DISTRIBUTIONS WITH RESPECT TO UNEXCHANGED SHARES

     Brooks will issue a Brooks stock certificate registered in the same name as
the surrendered PRI stock certificate. Brooks will issue a stock certificate in
a name other than this registered name only if the exchange agent is provided
with documents that:

     - show and effect the unrecorded transfer of ownership; and

     - show that any applicable stock transfer taxes have been paid.

PRI stockholders who do not surrender their PRI stock certificates will not
receive dividends payable to Brooks stockholders on any date after the effective
time of the merger. When the PRI stock certificates are finally surrendered, any
of these unpaid dividends will be paid, without interest.

                                        47


BACKGROUND OF THE MERGER

     Both Brooks and PRI regularly evaluate different strategies to improve
their competitive positions and enhance their respective stockholder values,
including opportunities for acquisitions of other companies or their assets,
possible partnerships or alliances and other significant transactions.

     Over the last three years, Brooks and PRI have from time to time engaged in
conversations regarding the possibility of combining their businesses. During
the latter half of 2000, Brooks and PRI again commenced discussions about the
combination of their businesses. Over the course of November and December 2000,
Brooks and PRI each conducted a detailed due diligence review of the other's
business and engaged in extensive negotiations over the terms of a proposed
merger of equals following which the former stockholders of Brooks and PRI would
each hold 50% of the combined company and the board of directors of the combined
company would be evenly divided between representatives of the former Brooks
stockholders and representatives of the former PRI stockholders. After extensive
discussions, the parties had not been able to resolve certain key issues
relating to the transaction, including issues relating to management structure,
arrangements for mitigation of the risk associated with the securities class
action that had recently been initiated against PRI, the scope of the parties'
mutual covenants regarding changes in their capital structure pending the
consummation of the merger, and the terms of the voting agreements proposed to
be entered into by certain affiliates of PRI. Because insufficient progress was
being made toward resolving these issues, negotiations between the two parties
were terminated in mid-January 2001.

     On July 16, 2001, while at SEMICON West, an industry trade show, in San
Jose, California, Ellen B. Richstone, senior vice president, finance and
administration and chief financial officer of Brooks, and Cosmo S. Trapani, vice
president and chief financial officer of PRI, met and discussed the possibility
of reopening discussions of a business combination between the companies. On
July 17, 2001, also at SEMICON West, Robert J. Therrien, president and chief
executive officer of Brooks, briefly discussed the same subject with Douglas
Lawson, PRI's vice president of strategic business development.

     On July 26, 2001, Mr. Therrien spoke with a representative of Credit Suisse
First Boston, Brooks' financial advisor, about a possible acquisition of PRI by
Brooks. On that same day, Mr. Therrien discussed the possibility of acquiring
PRI with Ms. Richstone and members of Brooks' management and board of directors.

     On July 27, 2001, Mr. Therrien and Ms. Richstone together spoke further
about a potential acquisition of PRI with a representative of Credit Suisse
First Boston.

     On July 30, 2001, Mr. Therrien met with Mitchell G. Tyson, president and
chief executive officer of PRI, and proposed reopening discussions of a business
combination between the two companies.

     On August 2, 2001, Mr. Therrien and Ms. Richstone spoke with a
representative of Credit Suisse First Boston and a representative of Brown
Rudnick Berlack Israels LLP legal counsel to Brooks, about a proposed
acquisition of PRI by Brooks. On that same day, Brooks sent Mr. Tyson a
preliminary term sheet relating to a proposed acquisition by PRI of Brooks at an
exchange ratio of 0.39. The term sheet contained a provision requiring PRI to
negotiate exclusively with Brooks for a period of four weeks. The proposal also
included a term sheet for a proposed employment agreement for Mr. Tyson, under
which he would serve as a special assistant to the chief executive officer of
Brooks during the six-month transition period after the closing of the merger.

     On August 3, 2001, Messrs. Tyson, Trapani and Lawson, together with
Mordechai Wiesler, PRI's chairman of the board, discussed Brooks' preliminary
term sheet with representatives of Morgan Stanley & Co. Incorporated, PRI's
financial advisor. After reviewing the preliminary term sheet with PRI's
management and representatives of Morgan Stanley, Mr. Tyson called Mr. Therrien
to inform him that it appeared unlikely that the parties could reach agreement
on the financial terms proposed by Brooks. However, Messrs. Tyson and Therrien
agreed to permit the two companies, together with their financial advisors, to
continue discussions.

                                        48


     Also on August 3, 2001, Mr. Tyson met with the chief executive officer of a
leading supplier of standard mechanical interface systems, material tracking and
control systems, and wafer-handling robots to the semiconductor industry, to
discuss the possibility of a business combination between their two companies.
Though public, this company had a significantly smaller market capitalization
than Brooks. From time to time between that date and the signing of the merger
agreement, representatives of PRI and representatives of this other company held
extensive discussions at various locations to explore a possible merger of
equals.

     From time to time between August 4, 2001 and August 23, 2001, Messrs.
Wiesler, Tyson and Trapani discussed the business combination proposed by Brooks
with representatives of Morgan Stanley and representatives of Foley, Hoag &
Eliot LLP, PRI's legal counsel. During the latter half of August 2001,
representatives of Morgan Stanley and another investment banking firm advised
the management of PRI that favorable market conditions presented an opportunity
for PRI to pursue a private placement of convertible debt securities, and the
management of PRI spent several weeks exploring this opportunity. On August 23,
2001, Mr. Wiesler informed Mr. Therrien that PRI was instructing Morgan Stanley
to cease discussions with Brooks' management and its financial advisor regarding
any business combination between Brooks and PRI. Shortly after the events of
September 11, 2001, PRI was advised that market conditions had become too
uncertain to proceed with any convertible debt financing in the near term and,
accordingly, PRI discontinued its efforts in that regard.

     On September 25, 2001, Messrs. Wiesler, Tyson, Trapani and Lawson
telephoned representatives of Morgan Stanley and Foley Hoag to discuss the
strategic alternatives available to PRI, including the possibility of a business
combination with Brooks, a merger of equals with the other company in the
semiconductor manufacturing equipment industry with which Mr. Tyson had had
discussions, and the alternative of remaining an independent company, both with
and without a convertible debt financing or other capital-raising transaction.
The participants also considered the possibility of other business combinations,
business ventures or strategic acquisitions but did not identify any
alternatives believed to be viable or as attractive as any of the foregoing
alternatives.

     On September 28, 2001, Messrs. Wiesler, Tyson, Trapani and Lawson
telephoned representatives of Morgan Stanley to continue discussions regarding
the strategic alternatives available to PRI.

     On October 4, 2001, Ms. Richstone and Mr. Trapani discussed by telephone
the possibility of reopening discussions regarding a business combination
involving Brooks and PRI. Later that day, Mr. Therrien placed calls to Messrs.
Wiesler and Tyson, and Mr. Tyson called a representative of Foley Hoag to
apprise him of these calls.

     On October 5, 2001, Messrs. Tyson, Trapani and Lawson telephoned
representatives of Foley Hoag to discuss PRI's strategic alternatives, including
business combinations with Brooks and the other semiconductor manufacturing
equipment company. Later in the day, Messrs. Tyson and Trapani telephoned a
representative of Morgan Stanley to brief him on their discussions with
potential business combination partners, including Brooks.

     On October 7, 2001, Mr. Therrien called Mr. Lawson and discussed with him
the strategic benefits of a business combination of Brooks and PRI. After a
general discussion of what the terms for such a transaction might be, Mr. Lawson
suggested to Mr. Therrien that if Brooks wished to proceed with such a
combination, it should present a proposal to PRI in the form of a term sheet.

     On October 8, 2001, Brooks presented Mr. Tyson with a term sheet relating
to a proposed acquisition of PRI by Brooks and a proposed employment agreement
for Mr. Tyson. The term sheet proposed a new exchange ratio of 0.49 and provided
that Brooks would appoint two PRI directors to the Brooks board, rather than
one. On that same day, PRI's board of directors held a regularly scheduled
meeting at PRI's corporate headquarters in Billerica, Massachusetts. All members
of PRI's board of directors were present in person or by telephone, except
Kenneth M. Thompson. Mr. Lawson, as well as representatives of Morgan Stanley
and Foley Hoag, were also present in person or by telephone. Mr. Lawson reported
to the board of directors regarding the discussions that he and Messrs. Wiesler,
Tyson and Trapani were

                                        49


conducting with Brooks and the other semiconductor manufacturing equipment
company about potential business combinations. After a discussion, the board of
directors authorized Messrs. Wiesler, Tyson, Trapani and Lawson to continue
negotiating with both parties. Following the meeting, Mr. Tyson called Mr.
Thompson to apprise him of the discussions at the board meeting and to solicit
his views on potential business combination partners.

     On October 9, 2001, Messrs. Wiesler and Tyson met with Mr. Therrien to
discuss the term sheet Brooks had presented to PRI on October 8.

     On October 12, 2001, Messrs. Therrien and Tyson further discussed the
October 8 term sheet by telephone and scheduled a mutual business due diligence
meeting for October 15, 2001.

     On October 14, 2001, Messrs. Tyson, Trapani and Lawson spoke by telephone
with representatives of Morgan Stanley and reviewed materials for the business
due diligence meeting that had been scheduled for October 15, 2001.

     On October 15, 2001, Mr. Therrien, Ms. Richstone, Chuck McKenna, executive
vice president of the automation systems division of Brooks, Michael Pippins,
senior vice president of the factory interface division of Brooks, and Jeffrey
Cassis, senior vice president of the factory automation division of Brooks, met
with Messrs. Tyson, Trapani and Lawson and representatives of Credit Suisse
First Boston and Morgan Stanley at a hotel in Boston. Both companies' management
teams reviewed the business, operations and financial condition of their
respective companies. Brooks and PRI continued their discussions regarding the
terms of a potential business combination. On that same day, Ms. Richstone
instructed representatives of Brown Rudnick to begin preparing drafts of a
merger agreement and certain ancillary agreements.

     On October 16, 2001, Mr. Therrien sent a cover letter and revised term
sheet to Mr. Tyson. The revised term sheet contained a proposed exchange ratio
of 0.49, but omitted the provision requiring PRI to negotiate exclusively with
Brooks. The revised term sheet also included proposals to deliver a draft
definitive agreement by October 18, 2001, to name Mr. Tyson, rather than another
PRI director, as a director of Brooks and to include PRI in the name of the
combined company. On October 16, 2001, Mr. Tyson responded to Mr. Therrien by
telephone and proposed an exchange ratio of 0.55. On the same day, Brown Rudnick
circulated a draft of the merger agreement to Brooks and its financial advisor.

     On October 17, 2001, Mr. Tyson received Mr. Therrien's cover letter and the
revised term sheet. Mr. Tyson sent the letter and the revised term sheet to
representatives of Morgan Stanley and Foley Hoag and discussed the proposed
transaction with them. On the same day, Brooks and representatives of Credit
Suisse First Boston and Brown Rudnick discussed the terms of the draft of the
merger agreement to be forwarded to PRI. Representatives of Foley Hoag, Brown
Rudnick and Mr. Tyson's legal counsel, Goulston & Storrs, discussed the terms of
an employment agreement between Mr. Tyson and Brooks that would become effective
upon the closing of the merger. The draft agreement, as proposed by Brooks,
incorporated the terms offered by Brooks in its August 2, 2001 term sheet.

     On October 18, 2001, representatives of Brooks, Credit Suisse First Boston
and Brown Rudnick continued to discuss the terms of the draft of the merger
agreement. Later that same day, at the direction of Brooks, a representative of
Credit Suisse First Boston delivered drafts of the merger agreement and related
agreements to Morgan Stanley, which Morgan Stanley then forwarded to Messrs.
Wiesler, Tyson, Trapani and Lawson and representatives of Foley Hoag. The draft
merger agreement contained a proposed exchange ratio of 0.49 and was otherwise
consistent with the October 16 term sheet. Later that day, Messrs. Wiesler,
Tyson, Trapani and Lawson, as well as representatives of Morgan Stanley and
Foley Hoag, discussed the draft merger agreement via telephone. At the same
time, the negotiation of Mr. Tyson's employment agreement with Brooks continued.

     On October 19, 2001, Messrs. Wiesler, Tyson, Trapani and Lawson reviewed
the draft merger agreement in more detail with representatives of Morgan Stanley
and Foley Hoag. Among the principal matters discussed was the exchange ratio
proposed in the draft merger agreement. Later that day, Mr. Tyson called Mr.
Therrien to discuss the exchange ratio. During the course of their discussion,

                                        50


Messrs. Therrien and Tyson came to a tentative agreement on an exchange ratio of
0.52, and they agreed to recommend that exchange ratio for approval by their
respective boards of directors. Following his call with Mr. Therrien, Mr. Tyson
reconvened his earlier telephone conversation with Messrs. Wiesler, Trapani and
Lawson and representatives of Morgan Stanley and Foley Hoag, and informed them
that he and Mr. Therrien had tentatively agreed upon an exchange ratio. At the
same time, representatives of Brooks, Credit Suisse First Boston and Brown
Rudnick discussed the tentative exchange ratio agreement. Later that day,
advisors to Brooks and PRI exchanged due diligence requests on behalf of their
clients, updating their earlier due diligence inquiries from late 2000 and early
2001, and began updating their due diligence. At the same time, representatives
of Foley Hoag continued to review the draft merger agreement.

     On October 20, 2001, advisors to Brooks and PRI continued updating their
due diligence review of PRI and Brooks, respectively. Also on that day,
representatives of Foley Hoag and Brown Rudnick and an attorney for Mr. Tyson
negotiated the terms of Mr. Tyson's employment agreement, which differed from
the terms originally proposed by Brooks. For example, the parties agreed that
the compensation Mr. Tyson would receive for his non-competition agreement would
be fifty percent greater than his current salary, rather than equal to his
current salary, in part to reflect his ineligibility for bonus compensation
during the non-competition period; that he would also receive his retention
bonus in the event of death or disability; and that he would be able to exercise
his options until the earlier of expiration or three years after the effective
date of the merger, rather than until the earlier of expiration or one year
after the termination of his employment.

     On the morning of October 21, 2001, Messrs. Wiesler, Tyson, Trapani and
Lawson met with representatives of Morgan Stanley and Foley Hoag at a hotel in
Boston and initiated a telephonic meeting of the board of directors of PRI to
discuss the draft merger agreement and review with Morgan Stanley the financial
aspects of the proposed business combination. All of the directors of PRI
participated in the meeting. Mr. Tyson outlined for the board the principal
terms of the proposed business combination, and representatives of Morgan
Stanley reviewed with the PRI board the financial aspects of the proposed
combination. Although the other semiconductor manufacturing equipment company
had not yet made a firm offer to PRI, representatives of Morgan Stanley
discussed with PRI the most favorable terms that Morgan Stanley believed the
other company could reasonably offer based on the premium to PRI's stock price
implied by the other company's market capitalization and a business combination
structured as a merger of equals. Representatives of Morgan Stanley stated their
view that, considering the two companies' market capitalizations, trading
liquidity, likely business synergies with PRI and other factors, the exchange
ratio of 0.52 offered by Brooks represented greater value to PRI's stockholders
than the value the other company was believed to be capable of offering.
Representatives of Morgan Stanley also stated their belief that Morgan Stanley
would be able to offer an opinion as to the fairness, from a financial point of
view, of the proposed exchange ratio to the stockholders of PRI. Representatives
of Foley Hoag described for the board the principal terms of the merger
agreement and related agreements. The board of directors engaged in an extensive
discussion of the proposed terms of the business combination. After the
discussion, the board approved the business combination in principle. The
Board's approval was subject to the delivery by Morgan Stanley of an opinion
that the exchange ratio pursuant to the merger agreement was fair, from a
financial point of view, to the holders of shares of PRI common stock and to the
resolution of outstanding issues regarding the size of the termination fee, the
circumstances under which the termination fee would be payable, the definition
of material adverse change and the terms of the voting agreements proposed to be
executed by the directors and executive officers of PRI. On that same day,
advisors to Brooks and PRI continued their due diligence reviews of the two
companies.

     Later in the day on October 21, 2001, Mr. Therrien, Ms. Richstone, Lynda M.
Avallone, vice president and corporate treasurer of Brooks, Messrs. Wiesler,
Tyson, Trapani and Lawson and representatives of Credit Suisse First Boston,
Morgan Stanley, Brown Rudnick and Foley Hoag met to negotiate the draft merger
agreement.

     On the morning of October 22, 2001, Messrs. Trapani and Lawson, Steve
Wentzell, PRI's vice president of human resources, Brad Lawrence, PRI's vice
president and general manager, automation systems division, Robert de Neve,
PRI's vice president and general manager, OEM systems division,

                                        51


Michael Chase, PRI's director, systems and corporate marketing, Richard Vatcher,
PRI's vice president, automation services division, David Dunn, PRI's vice
president, finance, automation systems division, and John Chrisos, PRI's vice
president, account management, met in person or by telephone with Messrs.
Therrien, Pippins, Cassis, and McKenna, Ms. Richstone, Ms. Avallone, John Biasi,
Brooks' vice president, corporate marketing, Robert Katz, Brooks' director,
financial planning & analysis, Martin Hanssmann, Brooks' vice president, global
sales & service, Marty Petraitis, Brooks' vice president, global sales &
services -- Asia, Jack Marchant, Brooks' director of compensation and benefits,
James Chiafery, Brooks' former director of investor relations and a consultant
to it, and representatives of Credit Suisse First Boston and Morgan Stanley to
discuss certain aspects of the proposed business combination. The parties also
discussed matters relating to public disclosure of the proposed business
transaction and employee relations. Over the course of that day, advisors to
Brooks and PRI continued their due diligence review of PRI and Brooks,
respectively. In addition, representatives of Brown Rudnick and Foley Hoag
continued to negotiate the terms of the merger agreement and the ancillary
transaction documents, including Mr. Tyson's employment agreement with Brooks.
On that same day, representatives of Brooks made due diligence calls to PRI's
customers.

     Throughout the same day, representatives of Brown Rudnick and Foley Hoag
worked to complete the merger agreement, the ancillary documents and their
respective legal due diligence reviews, and representatives of Brooks and PRI
made final arrangements regarding marketing and communications and prepared a
draft press release. The parties agreed to revise the provision of Mr. Tyson's
employment agreement accelerating the vesting of his options to include an
option granted on October 8, 2001.

     At 1:30 p.m. on October 23, 2001, the board of directors of Brooks held a
meeting by telephone conference call. At this meeting, Brooks' management
reviewed the terms of the proposed business combination and its assessment of
PRI's business. Brooks' legal counsel reviewed the terms of the merger agreement
and various ancillary agreements and its due diligence regarding legal matters.
Also at this meeting, Credit Suisse First Boston reviewed its financial analysis
of the exchange ratio and rendered to the Brooks board of directors an oral
opinion, which opinion was confirmed by delivery of a written opinion dated
October 23, 2001, to the effect that, as of the date of the opinion and based on
and subject to the matters described in the opinion, the exchange ratio was
fair, from a financial point of view, to Brooks. The board of directors of
Brooks then unanimously approved the proposed business combination.

     At 8:00 p.m. on October 23, 2001, the board of directors of PRI held a
meeting by telephone conference call. Messrs. Trapani and Lawson, as well as
representatives of Morgan Stanley and Foley Hoag, participated in the meeting.
Mr. Tyson summarized for the board the final terms of the proposed business
combination, as well as the terms of his own employment arrangement with Brooks.
Representatives of Foley Hoag described for the board changes to the terms of
the merger agreement and various ancillary agreements. The revised merger
agreement provided, among other things, that the termination fee would equal $14
million rather than approximately $18.5 million; that the termination fee would
be payable upon a material breach of the no-shop covenant by any of PRI's
directors, executive officers, investment bankers or counsel, but only if the
breach were not cured within 24 hours after one of four identified executive
officers learned of the breach, rather than upon any breach of the no-shop
covenant; and that the definition of material adverse change would exclude any
reductions in force and any failure to meet internal projections or projections
relating to bookings. The revised voting agreements did not contain a separate
no-shop obligation applicable to the signatories personally. The final version
of Mr. Tyson's employment agreement was identical in all material respects to
the version described to the board at the October 21 board meeting and was
consistent with the terms proposed by Brooks, except for the modifications
negotiated on October 20 and 22. Representatives of Morgan Stanley again
reviewed for the board the strategic alternatives believed to be available to
PRI, including a possible merger of equals with the other semiconductor
manufacturing equipment company and remaining an independent company, both with
and without a convertible debt financing or other capital-raising transaction.
The board discussed the merits of the proposed business combination in light of
those alternatives. After this discussion, Morgan Stanley rendered to the board
of directors of PRI its oral opinion, subsequently confirmed in writing, that as
of October 23, 2001, and subject to the various considerations set forth in its
opinion, the

                                        52


exchange ratio pursuant to the merger agreement was fair, from a financial point
of view, to the holders of PRI common stock. After receiving Morgan Stanley's
opinion, the board concluded unanimously that the business combination with
Brooks represented the best long-term value for PRI stockholders. The board
declined to pursue a possible business combination with the other semiconductor
manufacturing equipment company because of the uncertainty of concluding an
agreement with that company, the greater perceived strategic benefits of a
combination with Brooks, and Morgan Stanley's view that the most favorable terms
the other company could reasonably offer to PRI would provide less value to
PRI's stockholders. The board also concluded that the strategic benefits of a
combination with Brooks, when combined with the substantial premium that the
merger consideration represented to the then-current trading price of the PRI
common stock, would offer PRI's stockholders greater long-term value than PRI
could provide as an independent company. The board of directors then unanimously
approved the terms of the proposed business combination. Representatives of
Morgan Stanley later delivered to the board of directors of PRI the written
opinion of Morgan Stanley confirming the oral opinion it delivered on October
23, 2001.

     At approximately 10:00 p.m. on October 23, 2001, the parties executed and
delivered the merger agreement and delivered the executed ancillary transaction
documents including Mr. Tyson's employment agreement with Brooks.

     At approximately 7:00 a.m. on October 24, 2001, Brooks and PRI issued a
joint press release announcing the proposed business combination.

JOINT REASONS FOR THE MERGER

     The Brooks board and the PRI board believe that by combining the highly
complementary technologies, product lines, distribution channels and customer
relationships of the two companies, the combined company will have the potential
to realize long-term improved growth and profitability and a stronger position
in the semiconductor manufacturing equipment industry. Brooks is a leading
supplier of products and systems for vacuum tool automation, fab software and
200mm and 300mm factory interface products such as sorters and load port
modules. PRI is an industry leader in automated material handling systems,
reticle automation and atmospheric robotics. Because Brooks and PRI have
concentrated on different areas within the semiconductor industry, the companies
believe that there was less than ten percent and likely closer to five percent
of overlap in the revenue streams of Brooks and PRI in fiscal 2001. When
combined, the company will be a single provider of a broad line of
cost-effective integrated automation solutions. In addition, the combined
company's global infrastructure of more than 40 regional sales, service and
technical support offices should allow increased penetration of PRI's and
Brooks' customers. By offering customers a comprehensive complement of
automation systems, software, services and products, supported by an extensive,
well-trained staff of engineers and operations and support personnel, the
combined company may be better able to serve customer requirements. The merger
is expected to allow the combined company to eliminate duplicative research and
development efforts and to redeploy resources to other research and development
activities. Due primarily to efforts such as these and the consolidation of
facilities and supply chains, Brooks and PRI expect to achieve approximately $20
million of cost savings in fiscal 2003 through operational synergies. In
summary, Brooks and PRI believe that the merger will give the combined company
the ability to compete more effectively against their competitors.

     The boards of directors of Brooks and PRI have identified additional mutual
benefits of the merger that they believe will contribute to the success of the
combined company. The principal potential benefits include the following:

     - the combination of Brooks' products with PRI's products will allow the
       combined company to offer a more comprehensive and integrated suite of
       products and services to its customers;

     - the creation of a larger field sales and service organization, the
       expansion of Brooks' and PRI's dedicated sales teams, a higher profile
       with customers and greater financial strength may present greater
       opportunities for marketing the products of the combined company;

                                        53


     - the creation of a combined customer service and technical support system
       may permit the combined company to provide more effective support
       coverage to its customers; and

     - the combined experience, financial resources, size and breadth of product
       offerings of the combined company may allow the combined company to
       respond more quickly and effectively to technological change, increased
       competition and industry demands in an industry which requires rapid
       innovation and change.

     Brooks and PRI have each identified additional reasons for the merger,
which are discussed below. Stockholders should be aware that the potential
benefits of the merger may not be realized. See "Risk Factors."

BROOKS' REASONS FOR THE MERGER AND RECOMMENDATION OF BROOKS' BOARD OF DIRECTORS

     At its October 23, 2001 board meeting, the Brooks board unanimously
approved the merger agreement and the transactions contemplated by the merger
agreement. In addition to the anticipated joint benefits described above, the
Brooks board believes that the following are additional reasons the merger will
be beneficial to Brooks and its stockholders and unanimously recommends that the
Brooks stockholders vote FOR the issuance of shares of Brooks common stock in
connection with the merger and the related proposals:

     - given the complementary nature of the product lines of Brooks and PRI,
       the merger will enhance the opportunity to realize Brooks' strategic
       objective of achieving greater scale and presence in the semiconductor
       manufacturing equipment industry;

     - combining Brooks and PRI would provide an opportunity for increased sales
       to and support of current Brooks and PRI customers by offering an
       integrated and broader product line; and

     - the Brooks stockholders would have the opportunity to participate in the
       potential for growth of the combined company after the merger.

     The Brooks board considered the potentially positive and negative aspects
of a number of factors relating to the merger, including, but not limited to,
the following:

     - the strategic benefits of the merger;

     - historical information concerning Brooks' and PRI's respective
       businesses, financial performance and condition, operations, technology,
       management and competitive position, including public reports concerning
       results of operations during the most recent fiscal year and fiscal
       quarters for each company filed with the SEC;

     - Brooks management's view of the financial condition, results of
       operations and businesses of Brooks and PRI before and after the merger
       and its expectation, based on such factors, that, on balance, the
       combined company could realize significant synergies leading to potential
       cost savings, stronger market presence, and increased sales;

     - current financial market conditions and historical market prices,
       volatility and trading information with respect to Brooks common stock
       and PRI common stock;

     - the consideration to be received by PRI stockholders in the merger and
       the relationship between the market value of the PRI common stock and the
       Brooks common stock, and a comparison of comparable merger transactions;

     - Brooks management's view of the prospects of Brooks as an independent
       company compared to the opportunity to realize its strategy for
       significant growth more rapidly, on balance, through a merger with PRI;

     - the potential for other third parties to enter into strategic
       relationships with or to acquire Brooks or PRI;

     - the financial presentation of Credit Suisse First Boston to the Brooks
       board, including its opinion, dated October 23, 2001, regarding the
       fairness, from a financial point of view to Brooks of the

                                        54


       exchange ratio provided for in the merger, as described more fully under
       the caption "Opinion of Brooks Financial Advisor;"

     - the expected impact of the merger on Brooks' customers and employees; and

     - discussions with Brooks' management and legal and financial advisors as
       to the results of the due diligence investigation of PRI.

     The Brooks board also considered the terms of the merger agreement,
including the representations, warranties, covenants, provisions relating to
termination fees and provisions relating to PRI's ability to conduct its
business prior to the completion of the merger.

     The Brooks board of directors also identified a number of potential
negative factors, including:

     - the risk that the slowdown in the economy, particularly in the
       semiconductor industry, will continue to worsen, resulting in losses
       greater than the projected losses of each of Brooks and PRI;

     - the risk associated with the pending class action securities litigation
       filed against PRI and three of its directors relating to damages
       allegedly incurred by virtually all purchasers of PRI common stock from
       January 27, 2000 through September 11, 2000;

     - the risk that the potential benefits sought in the merger might not be
       fully realized;

     - the possibility that the merger might not be consummated;

     - the potential dilutive effect of the issuance of Brooks common stock in
       the merger;

     - one time charges and other costs of $45 million to $55 million are
       expected to be incurred, primarily in the quarter in which the
       transaction closes, in connection with the merger, including costs of
       integrating the businesses and transaction expenses arising from the
       merger, particularly if the combined company fails to achieve operational
       synergies resulting in cost savings of at least $20 million in fiscal
       2003;

     - the risk that despite the efforts of the combined company, key technical
       and management personnel might not remain employed by the combined
       company; and

     - various other risks, including the risks described in the section of this
       joint proxy statement/prospectus entitled "Risk Factors" beginning on
       page 18.

     Brooks' board of directors concluded that, on balance, the potential
benefits of the merger to Brooks and its stockholders outweighed the risks
associated with the merger. Although the foregoing discussion summarizes all the
material factors discussed by the board at meetings of the board, the discussion
is not an exhaustive list of all information and factors considered by Brooks'
board of directors. Brooks' board of directors did not find it practicable to,
and did not, quantify or otherwise assign relative weight to, the specific
positive or negative factors considered in reaching its determination. Instead,
Brooks' board conducted an overall analysis of the factors described above,
including summaries of discussions of Brooks' management with Brooks' legal,
financial and accounting advisors. In considering the factors described above,
individual members of Brooks board of directors may have given different weights
to different factors.

     BROOKS' BOARD OF DIRECTORS HAS UNANIMOUSLY APPROVED THE MERGER AGREEMENT
AND THE ISSUANCE OF SHARES OF BROOKS COMMON STOCK IN THE MERGER. BROOKS' BOARD
OF DIRECTORS BELIEVES THAT THE TERMS OF THE MERGER AGREEMENT ARE FAIR TO AND IN
THE BEST INTERESTS OF BROOKS AND ITS STOCKHOLDERS AND RECOMMENDS THAT BROOKS
STOCKHOLDERS VOTE FOR THE ISSUANCE OF SHARES OF BROOKS COMMON STOCK NECESSARY TO
COMPLETE THE MERGER.

OPINION OF BROOKS' FINANCIAL ADVISOR

     Credit Suisse First Boston has acted as Brooks' exclusive financial advisor
in connection with the merger. Brooks selected Credit Suisse First Boston based
on Credit Suisse First Boston's experience, expertise and reputation, and its
familiarity with Brooks and its business. Credit Suisse First Boston is an
internationally recognized investment banking firm and is regularly engaged in
the valuation of businesses and securities in connection with mergers and
acquisitions, leveraged buyouts, negotiated underwritings,

                                        55


competitive biddings, secondary distributions of listed and unlisted securities,
private placements and valuations for corporate and other purposes.

     In connection with Credit Suisse First Boston's engagement, Brooks
requested that Credit Suisse First Boston evaluate the fairness, from a
financial point of view, to Brooks of the exchange ratio provided for in the
merger. On October 23, 2001, at a meeting of the Brooks board of directors held
to evaluate the merger, Credit Suisse First Boston rendered to the Brooks board
of directors an oral opinion, which opinion was confirmed by delivery of a
written opinion dated October 23, 2001, to the effect that, as of that date and
based on and subject to the matters described in its opinion, the exchange ratio
was fair, from a financial point of view, to Brooks.

     THE FULL TEXT OF CREDIT SUISSE FIRST BOSTON'S WRITTEN OPINION, DATED
OCTOBER 23, 2001, TO THE BROOKS BOARD OF DIRECTORS, WHICH SETS FORTH THE
PROCEDURES FOLLOWED, ASSUMPTIONS MADE, MATTERS CONSIDERED AND LIMITATIONS ON THE
REVIEW UNDERTAKEN, IS ATTACHED AS APPENDIX E AND IS INCORPORATED INTO THIS JOINT
PROXY STATEMENT/PROSPECTUS BY REFERENCE. HOLDERS OF BROOKS COMMON STOCK ARE
ENCOURAGED TO READ THIS OPINION CAREFULLY AND IN ITS ENTIRETY. CREDIT SUISSE
FIRST BOSTON'S OPINION IS ADDRESSED TO THE BROOKS BOARD OF DIRECTORS AND RELATES
ONLY TO THE FAIRNESS, FROM A FINANCIAL POINT OF VIEW, OF THE EXCHANGE RATIO,
DOES NOT ADDRESS ANY OTHER ASPECT OF THE PROPOSED MERGER OR ANY RELATED
TRANSACTION AND DOES NOT CONSTITUTE A RECOMMENDATION TO ANY STOCKHOLDER AS TO
ANY MATTER RELATING TO THE MERGER. THE SUMMARY OF CREDIT SUISSE FIRST BOSTON'S
OPINION IN THIS JOINT PROXY STATEMENT/PROSPECTUS IS QUALIFIED IN ITS ENTIRETY BY
REFERENCE TO THE FULL TEXT OF THE OPINION.

     In arriving at its opinion, Credit Suisse First Boston reviewed the merger
agreement and publicly available business and financial information relating to
Brooks and PRI. Credit Suisse First Boston also reviewed other information
relating to Brooks and PRI, including publicly available financial forecasts
relating to Brooks and financial forecasts relating to PRI prepared and provided
to Credit Suisse First Boston by PRI, and met with the managements of Brooks and
PRI to discuss the businesses and prospects of Brooks and PRI. Credit Suisse
First Boston considered financial and stock market data of Brooks and PRI, and
compared those data with similar data for publicly held companies in businesses
similar to those of Brooks and PRI and considered, to the extent publicly
available, the financial terms of other business combinations and other
transactions effected or announced. Credit Suisse First Boston also considered
other information, financial studies, analyses and investigations and financial,
economic and market criteria that it deemed relevant.

     In connection with its review, Credit Suisse First Boston did not assume
any responsibility for independent verification of any of the information that
it reviewed or considered and relied on that information being complete and
accurate in all material respects. With respect to the publicly available
financial forecasts for Brooks, Credit Suisse First Boston reviewed and
discussed the forecasts with the management of Brooks and was advised, and
assumed, that the forecasts represented reasonable estimates as to the future
financial performance of Brooks. Credit Suisse First Boston was advised, and
assumed, that the financial forecasts for PRI, including adjustments to the
forecasts, were reasonably prepared on bases reflecting the best currently
available estimates and judgments of the management of PRI as to the future
financial performance of PRI. In addition, Credit Suisse First Boston relied,
without independent verification, on the assessments of the managements of
Brooks and PRI as to Brooks' and PRI's existing and future technology and
products and risks associated with such technology and products, the potential
cost savings and synergies, including the amount, timing and achievability of
those cost savings and synergies, and strategic benefits anticipated by the
managements of Brooks and PRI to result from the merger, and Brooks' and PRI's
ability to integrate their businesses and to retain key employees. In addition,
Credit Suisse First Boston assumed, with Brooks' consent, that the proposed
merger would be consummated upon the terms and subject to the conditions set
forth in the merger agreement without amendment, modification, or waiver of any
material terms and that in the course of obtaining any necessary regulatory and
third party approvals and consents for the proposed merger, no modification,
condition, restriction, limitation or delay would be imposed that would have a
material adverse effect on Brooks or PRI or the contemplated benefits of the
proposed merger. Credit Suisse First Boston also noted that the merger agreement
contemplated alternate transaction structures. Credit Suisse First Boston also

                                        56


assumed, with Brooks' consent, that the merger would be treated as a tax-free
reorganization for federal income tax purposes. Credit Suisse First Boston was
not requested to, and did not, make an independent evaluation or appraisal of
the assets or liabilities, contingent or otherwise, of Brooks or PRI, including,
without limitation, any potential liabilities arising from litigation pending
against PRI, and Credit Suisse First Boston was not furnished with any
evaluations or appraisals.

     Credit Suisse First Boston's opinion was necessarily based on information
available to it, and financial, economic, market and other conditions as they
existed and could be evaluated, on the date of Credit Suisse First Boston's
opinion. Credit Suisse First Boston did not express any opinion as to what the
value of Brooks common stock actually would be when issued in the merger or the
prices at which Brooks common stock would trade at any time after the merger.
Although Credit Suisse First Boston evaluated the exchange ratio from a
financial point of view, Credit Suisse First Boston was not requested to, and
did not, recommend the specific consideration payable in the merger, which
consideration was determined between Brooks and PRI. Credit Suisse First
Boston's opinion did not address the relative merits of the merger as compared
to other business strategies that might have been available to Brooks, and also
did not address the underlying business decision of Brooks to proceed with the
merger. Except as described above, Brooks imposed no other limitations on Credit
Suisse First Boston with respect to the investigations made or procedures
followed in rendering its opinion.

     It should be understood that Credit Suisse First Boston's opinion, dated
October 23, 2001, to the Brooks board of directors speaks as of that date and
that Credit Suisse First Boston does not have any obligation to update, revise
or reaffirm its opinion, including at the time of the meeting of Brooks'
stockholders. If, however, a material amendment to the merger agreement is
entered into which modifies the exchange ratio, the Brooks board of directors
may at that time seek an updated opinion from Credit Suisse First Boston. In
making this determination, the Brooks board of directors would consult with its
legal and financial advisors and take into account, consistent with its
fiduciary duties, all relevant factors and circumstances existing at the time,
including general market, economic and business conditions.

     In preparing its opinion to the Brooks board of directors, Credit Suisse
First Boston performed a variety of financial and comparative analyses,
including those described below. The summary of Credit Suisse First Boston's
analyses described below is not a complete description of the analyses
underlying its opinion. The preparation of a fairness opinion is a complex
process involving various determinations as to the most appropriate and relevant
methods of financial analysis and the application of those methods to the
particular circumstances and, therefore, a fairness opinion is not readily
susceptible to partial analysis or summary description. In arriving at its
opinion, Credit Suisse First Boston made qualitative judgments as to the
significance and relevance of each analysis and factor that it considered.
Accordingly, Credit Suisse First Boston believes that its analyses must be
considered as a whole and that selecting portions of its analyses and factors or
focusing on information presented in tabular format, without considering all
analyses and factors or the narrative description of the analyses, could create
a misleading or incomplete view of the processes underlying its analyses and
opinion and believes that the totality of the factors considered and analyses
performed by Credit Suisse First Boston in connection with its opinion operated
collectively to support Credit Suisse First Boston's determination as to the
fairness, from a financial point of view, of the exchange ratio to Brooks.

     In its analyses, Credit Suisse First Boston considered industry
performance, general business, economic, market and financial conditions and
other matters, many of which are beyond the control of Brooks and PRI. No
company, transaction or business used in Credit Suisse First Boston's analyses
as a comparison is identical to Brooks, PRI or the proposed merger, and an
evaluation of the results of those analyses is not entirely mathematical.
Rather, the analyses involve complex considerations and judgments concerning
financial and operating characteristics and other factors that could affect the
acquisition, public trading or other values of the companies, business segments
or transactions analyzed. The estimates contained in Credit Suisse First
Boston's analyses and the ranges of valuations resulting from any particular
analysis are not necessarily indicative of actual values or predictive of future
results or values, which may be significantly more or less favorable than those
suggested by the analyses. In addition, analyses relating to the value of
businesses or securities do not purport to be appraisals or to reflect the

                                        57


prices at which businesses or securities actually may be sold. Accordingly,
Credit Suisse First Boston's analyses and estimates are inherently subject to
substantial uncertainty.

     Credit Suisse First Boston's opinion and financial analyses were only one
of many factors considered by the Brooks board of directors in its evaluation of
the proposed merger and should not be viewed as determinative of the views of
the Brooks board of directors or management with respect to the merger or the
exchange ratio.

     The following is a summary of the material financial analyses underlying
Credit Suisse First Boston's opinion dated October 23, 2001 delivered to the
Brooks board of directors in connection with the merger. THE FINANCIAL ANALYSES
SUMMARIZED BELOW INCLUDE INFORMATION PRESENTED IN TABULAR FORMAT. IN ORDER TO
FULLY UNDERSTAND CREDIT SUISSE FIRST BOSTON'S FINANCIAL ANALYSES, THE TABLES
MUST BE READ TOGETHER WITH THE TEXT OF EACH SUMMARY. THE TABLES ALONE DO NOT
CONSTITUTE A COMPLETE DESCRIPTION OF THE FINANCIAL ANALYSES. CONSIDERING THE
DATA IN THE TABLES BELOW WITHOUT CONSIDERING THE FULL NARRATIVE DESCRIPTION OF
THE FINANCIAL ANALYSES, INCLUDING THE METHODOLOGIES AND ASSUMPTIONS UNDERLYING
THE ANALYSES, COULD CREATE A MISLEADING OR INCOMPLETE VIEW OF CREDIT SUISSE
FIRST BOSTON'S FINANCIAL ANALYSES.

     Contribution Analysis.  Credit Suisse First Boston reviewed the relative
contributions of Brooks and PRI to the revenue and gross profit of the combined
company for the latest 12 months and as estimated for fiscal years 2001 and
2002, excluding potential synergies, based on publicly available research
analysts' estimates for Brooks, referred to as the Brooks street case, and two
cases for PRI, a PRI management case and a PRI alternative case. The PRI
management case was based on internal estimates of PRI's management. The PRI
alternative case included adjustments to the PRI management case, based on
discussions with the managements of Brooks and PRI, to reflect, among other
things, the potential for decreased revenue and profitability of PRI.

     Credit Suisse First Boston then computed the fully diluted ownership
percentages of PRI's stockholders in the combined company implied by PRI's
relative contribution for each operational metric observed, in each case
adjusted to reflect net debt balances, and the exchange ratios implied by those
percentages, based on different scenarios of the cases outlined above. This
analysis indicated a range of pro forma ownership of PRI's stockholders in the
combined company of approximately 33.1% to 43.9%, including a mean and median of
38.9% and 39.8%, respectively, for the Brooks street case/PRI management case
and a mean and median of 38.3% and 38.1%, respectively, for the Brooks street
case/PRI alternative case, as compared to the pro forma ownership of PRI's
stockholders implied by the exchange ratio in the merger of 39.1%, and a range
of implied exchange ratios of approximately 0.408x to 0.620x, including a mean
and median of 0.520x and 0.533x, respectively, for the Brooks street case/PRI
management case and a mean and median of 0.509x and 0.501x, respectively, for
the Brooks street case/PRI alternative case, as compared to the exchange ratio
in the merger of 0.520x, as indicated in the following table:



                                                               LOW      MEAN    MEDIAN    HIGH
                                                              ------   ------   ------   ------
                                                                             
IMPLIED PRI STOCKHOLDER PRO FORMA OWNERSHIP PERCENTAGE
  Brooks street case/PRI management case....................   33.1%    38.9%   39.8%     43.9%
  Brooks street case/PRI alternative case...................   33.1%    38.3%   38.1%     43.9%
IMPLIED EXCHANGE RATIO
  Brooks street case/PRI management case....................  0.408x   0.520x   0.533x   0.620x
  Brooks street case/PRI alternative case...................  0.408x   0.509x   0.501x   0.620x


     Exchange Ratio Analysis.  Credit Suisse First Boston reviewed the ratio of
the closing price of PRI common stock to the closing price of Brooks common
stock on October 22, 2001 and the average of this ratio calculated over various
periods from January 3, 2000 to October 22, 2001. Credit Suisse First Boston
then computed the fully diluted ownership of PRI's stockholders in the combined
company immediately upon consummation of the merger implied by the resulting
exchange ratios and also computed the premium/(discount) implied by the exchange
ratio in the merger relative to the average market exchange ratios for the
periods observed. This analysis yielded an implied exchange ratio range of
0.358x to 0.770x,

                                        58


as compared to the exchange ratio in the merger of 0.520x, an implied fully
diluted ownership percentage range for PRI's stockholders in the combined
company of approximately 30.1% to 49.8%, as compared to the fully diluted
ownership percentage of PRI's stockholders in the combined company immediately
upon consummation of the merger of approximately 39.1%, and an implied merger
premium/(discount) range of approximately (32.5%) to 45.3%, as compared to the
premium/(discount) for PRI common stock of 45.3% implied by the exchange ratio
in the merger of 0.520x as indicated in the following table:



                                                                                   IMPLIED MERGER
                                                       IMPLIED PRI FULLY DILUTED      PREMIUM/
PERIOD                                EXCHANGE RATIO     OWNERSHIP PERCENTAGE        (DISCOUNT)
------                                --------------   -------------------------   --------------
                                                                          
October 22, 2001....................      0.358x                30.1%                   45.3%
Last 5 Trading Days Average.........      0.364x                30.5%                   43.1%
Last 10 Trading Days Average........      0.363x                30.4%                   43.4%
Last 20 Trading Days Average........      0.362x                30.4%                   43.7%
Last 30 Trading Days Average........      0.371x                30.9%                   40.3%
Last 60 Trading Days Average........      0.367x                30.7%                   41.5%
Last 90 Trading Days Average........      0.364x                30.5%                   42.8%
Last 180 Trading Days Average.......      0.417x                33.6%                   24.7%
Period average......................      0.770x                49.8%                  (32.5)%


     Comparable Company Analysis.  Credit Suisse First Boston compared
financial, operating and stock market data of Brooks and PRI to corresponding
data of the following 12 publicly traded companies in the Automation, Majors and
Original Equipment Manufacturers (Small Capitalization) segments of the
semiconductor capital equipment industry:



        AUTOMATION                      MAJORS              OEM (SMALL CAPITALIZATION)
        ----------                      ------              --------------------------
                                                      
- Asyst Technologies, Inc.  - Applied Materials, Inc.       - Veeco Instruments Inc.
- Adept Technology, Inc.    - KLA-Tencor Corporation        - Newport Corporation
                            - ASM Lithography Holding N.V.  - Cymer, Inc.
                            - Novellus Systems, Inc.        - Therma-Wave,Inc.
                            - Lam Research Corporation      - Nanometrics Incorporated


     Such information included, among other things, multiples of fully diluted
aggregate values, calculated as fully diluted equity value, plus net debt, as a
multiple of the latest 12 months revenue and calendar years 2001 and 2002
estimated revenue. All multiples were based on closing stock prices on October
22, 2001. Estimated financial data for Brooks and the selected companies were
based on publicly available research analysts' estimates and estimated financial
data for PRI were based on the PRI management case, described above under the
heading "Contribution Analysis." This analysis indicated a range of mean and
median multiples for the selected companies for the latest 12 months revenue of
0.5x to 2.4x and 0.5x to 2.7x, respectively, as compared to the corresponding
multiples implied for PRI of 0.8x based on the closing price of PRI common stock
on October 22, 2001, and of 1.2x based on the exchange ratio in the merger, and
the corresponding multiple implied for Brooks of 1.5x based on the closing price
of Brooks common stock on October 22, 2001. This analysis also indicated a range
of mean and median multiples for the selected companies for estimated calendar
year 2001 revenue of 0.7x to 3.2x and 0.7x to 3.2x, respectively, as compared to
the corresponding multiples implied for PRI of 1.0x based on the closing price
of PRI common stock on October 22, 2001, and of 1.5x based on the exchange ratio
in the merger, and the corresponding multiple for Brooks of 1.9x based on the
closing price of Brooks common stock on October 22, 2001. This analysis further
indicated a range of mean and median multiples for the selected companies for
estimated calendar year 2002 revenue of 1.1x to 4.0x and 1.1x to 3.9x,
respectively, as compared to the corresponding multiples implied for PRI of 1.3x
based on the closing price of PRI common stock on October 22, 2001, and of 2.0x
based on the exchange ratio in the merger, and the

                                        59


corresponding multiple for Brooks of 2.1x based on the closing price of Brooks
common stock on October 22, 2001. These multiples are indicated in the following
table:



                                                                         OEM SMALL
                                       AUTOMATION        MAJORS       CAPITALIZATION           PRI          BROOKS
                                      -------------   -------------   ---------------   -----------------   ------
                                      MEAN   MEDIAN   MEAN   MEDIAN   MEAN    MEDIAN    10/22/01   MERGER
                                      ----   ------   ----   ------   -----   -------   --------   ------
                                                                                 
AGGREGATE VALUE AS MULTIPLE OF:
Latest 12 months revenue............  0.5x    0.5x    2.4x    2.7x    1.8x     1.4x       0.8x      1.2x     1.5x
Estimated calendar year 2001
  revenue...........................  0.7x    0.7x    3.2x    3.2x    2.1x     2.0x       1.0x      1.5x     1.9x
Estimated calendar year 2002
  revenue...........................  1.1x    1.1x    4.0x    3.9x    2.3x     2.2x       1.3x      2.0x     2.1x


     Precedent Transactions Analysis.  Credit Suisse First Boston reviewed the
premiums and implied transaction multiples paid in the following six merger and
acquisition transactions in the semiconductor capital equipment industry:

           TARGET                                  ACQUIROR
           ------                                  --------

- GenRad, Inc.                          Teradyne, Inc.
- Silicon Valley Group, Inc.            ASM Lithography Holding N.V.
- CFM Technologies, Inc.                Mattson Technology, Inc.
- CVC, Inc.                             Veeco Instruments Inc.
- OnTrak Systems, Inc.                  Lam Research Corporation
- Tencor Instruments                    KLA Instruments Corporation

     In each transaction, Credit Suisse First Boston calculated the premium
implied by the exchange ratio and the acquiror's public closing stock price
prior to announcement of the transaction relative to the closing stock prices
for the targets in the transactions one trading day and 30 trading days prior to
public announcement of the transaction. This analysis indicated implied mean and
median premiums in the selected transactions one trading day prior to public
announcement of each transaction of 36.4% and 42.0%, respectively, as compared
to the premium to the closing price of PRI common stock on October 22, 2001
implied by the exchange ratio in the merger and the closing stock price for
Brooks common stock on October 22, 2001 of 45.3%. Additionally, the analysis
indicated implied mean and median premiums in the selected transactions for 30
trading days prior to public announcement of each transaction of 48.4% and
42.6%, respectively, as compared to the premium to the closing price of PRI
common stock 30 days prior to public announcement of the merger implied by the
exchange ratio in the merger and the closing stock price for Brooks common stock
on October 22, 2001 of 7.0%. These implied premiums are as indicated in the
following table:



                                                    IMPLIED PREMIUMS IN
                                                   SELECTED TRANSACTIONS
                                                ----------------------------
                                                CURRENT PRICE   30-DAY PRICE
                                                -------------   ------------
                                                              
Mean..........................................      36.4%           48.4%
Median........................................      42.0%           42.6%


     Credit Suisse First Boston also reviewed aggregate values in the selected
transactions as a multiple of latest 12 months revenue and next 12 months
revenue. All multiples for the selected transactions were based on information
available at the time of the relevant transaction. Estimated financial data for
PRI were based on the two cases for PRI described above under the heading
"Contribution Analysis." Estimated financial data for the selected transactions
were based on publicly available research analysts' estimates. This analysis
indicated mean and median aggregate values as a multiple of latest 12 months
revenue for the selected transactions of 2.7x and 2.9x, respectively, as
compared to the corresponding multiple for PRI of 1.2x based on the exchange
ratio in the merger and the closing stock price for Brooks common stock on
October 22, 2001, and mean and median aggregate values as a multiple of next 12
months revenue for the selected transactions of 2.8x and 2.9x, respectively, as
compared to corresponding multiples for PRI of 2.0x for the PRI management case
and 2.1x for the PRI alternative

                                        60


case, based on the exchange ratio in the merger and the closing stock price for
Brooks common stock on October 22, 2001, as indicated in the following table:



                                              SELECTED
                                            TRANSACTIONS
                                            -------------
AGGREGATE VALUE AS A MULTIPLE OF:           MEAN   MEDIAN                 PRI
---------------------------------           ----   ------   -------------------------------
                                                                    
Latest 12 months revenue..................  2.7x    2.9x                 1.2x

                                                            MANAGEMENT          ALTERNATIVE
                                                            ----------          -----------
Next 12 months revenue....................  2.8x    2.9x      2.0x               2.1x


     Credit Suisse First Boston also reviewed the average exchange ratio
premiums paid in 249 stock-for-stock transactions in the technology universe
since April 30, 1987 and the average exchange ratio premiums paid in 75
stock-for-stock transactions between $250 million and $750 million in the
technology universe since April 30, 1987. For each group of transactions, Credit
Suisse First Boston calculated the premium implied by the exchange ratio in the
transaction relative to the ratio of the closing stock prices for the targets
and acquirors in the transactions one trading day and over various periods prior
to public announcement of the transaction. Credit Suisse First Boston then
applied the resulting premiums to the ratio of the closing price of PRI common
stock to the closing price of Brooks common stock over the same periods. This
analysis indicated a range of implied exchange ratios over the various periods
observed of 0.471x to 0.635x, as compared to the exchange ratio in the merger of
0.520x, as indicated in the following table:



                                                  EXCHANGE RATIOS IMPLIED BY PRECEDENT TRANSACTIONS
                                         --------------------------------------------------------------------
                                         LATEST 12
                                          MONTHS
PRECEDENT TRANSACTIONS                    AVERAGE    90 DAYS   60 DAYS   30 DAYS   10 DAYS   1 DAY    AVERAGE
----------------------                   ---------   -------   -------   -------   -------   ------   -------
                                                                                 
249 Precedent Transactions.............   0.635x     0.486x    0.512x    0.526x    0.504x    0.475x   0.527x
75 Precedent Transactions..............   0.585x     0.471x    0.513x    0.529x    0.504x    0.480x   0.520x


     Pro Forma Earnings Impact Analysis.  Credit Suisse First Boston analyzed
the potential pro forma effect of the merger on the Brooks' estimated earnings
per share, assuming no synergies, one-time charges relating to the merger, for
fiscal year 2002, based on the scenarios described above under the heading
"Contribution Analysis." Based on the exchange ratio in the merger of 0.520x,
this analysis indicated that the merger could be dilutive to the combined
company's estimated earnings per share for fiscal year 2002, under the Brooks
street case/PRI management case and the Brooks street case/PRI alternative case.

     Credit Suisse First Boston also analyzed the potential pro forma effect of
the merger on Brooks' estimated earnings per share for the fiscal year 2002
based on the scenarios described above under the heading "Contribution
Analysis," assuming, based on discussions with the managements of Brooks and
PRI, a range of pretax potential cost savings and other synergies from the
merger, excluding merger related costs, referred to as the low synergy, low-mid
synergy, mid synergy, mid-high synergy and high synergy cases. Based on the
exchange ratio in the merger of 0.520x, this analysis indicated that the merger
could be accretive to Brooks' earnings per share for the fiscal year 2002, under
the Brooks street case/PRI management case, under all synergy cases, and under
the Brooks street case/PRI alternative case, under the mid-high and high synergy
cases, and dilutive to Brooks' earnings per share for the fiscal year 2002,
under the Brooks street case/PRI alternative case, under the low, low-mid and
mid synergy cases.

     The actual results achieved by the combined company may vary from projected
results and the variations may be material.

     Other Factors.  In the course of preparing its opinion, Credit Suisse First
Boston also reviewed and considered other information and data, including:

     - reported earnings per share for the last 11 fiscal quarters for PRI
       compared to publicly available research analysts' estimates for the
       respective quarters;

     - research analysts' reports for PRI common stock, including earnings per
       share and revenue estimates; and

                                        61


     - historical price performance and trading characteristics of Brooks common
       stock and PRI common stock and the relationship between movements in
       Brooks common stock, movements in PRI common stock and movements in
       selected stock indices of related industries.

     Miscellaneous.  Brooks has agreed to pay Credit Suisse First Boston for its
financial advisory services in connection with the merger an aggregate fee of
$7.0 million, $6.5 million of which is payable upon consummation of the merger.
Brooks also has agreed to reimburse Credit Suisse First Boston for its
reasonable, documented and customary out-of-pocket expenses, including fees and
expenses of legal counsel and any other advisor retained by Credit Suisse First
Boston, and to indemnify Credit Suisse First Boston and related parties against
liabilities, including liabilities under the federal securities laws, arising
out of its engagement.

     Credit Suisse First Boston and its affiliates in the past have provided,
and are currently providing, investment banking and financial services to Brooks
unrelated to the proposed merger, for which services Credit Suisse First Boston
and its affiliates have received, and will receive, compensation. During the
past two years, Brooks has paid Credit Suisse First Boston approximately $9.2
million for investment banking and financial services unrelated to the merger.
In addition, an affiliate of Credit Suisse First Boston beneficially owns shares
of Brooks common stock and PRI common stock. In the ordinary course of business,
Credit Suisse First Boston and its affiliates may actively trade the securities
of Brooks or PRI for their own accounts and for the accounts of customers and,
accordingly, may at any time hold long or short positions in those securities.

INTERESTS OF BROOKS' MANAGEMENT IN THE MERGER AND POTENTIAL CONFLICTS OF
INTEREST

     In considering the recommendation of Brooks' board of directors with
respect to the proposed merger, Brooks stockholders should note that some of
Brooks' directors and executive officers have interests in the merger that are
different from, or in addition to, their interests solely as Brooks
stockholders. These interests may create potential conflicts of interest.
Brooks' board of directors was aware of the interests relating to the voting
agreement and employment agreement and took these interests into account in
approving the proposed merger and the transactions contemplated by the merger
agreement.

     Voting Agreements.  The directors and executive officers of Brooks have
entered into voting agreements with PRI in which they agreed, among other
things, to vote all Brooks shares over which they have voting power to approve
and adopt the merger agreement, the merger and all agreements and actions
related to the merger. See "Related Agreements -- Voting Agreements" beginning
on page 91.

     Employment Agreement.  Robert J. Therrien, Brooks' president, chief
executive officer and a member of its board of directors, entered into an
employment agreement with Brooks effective as of October 1, 2001 that provides
that Mr. Therrien will receive more favorable salary and supplemental retirement
benefits if the merger with PRI is completed. For a more complete description of
the employment agreement, see "Brooks Executive Compensation and Other
Matters -- Employment Contracts" beginning on page 136.

     Nonemployee Directors Compensation.  Brooks has approved a new, more
favorable compensation package for its nonemployee directors in the event the
merger with PRI is completed. For a more complete description of the nonemployee
director compensation package, see "Brooks Board of Directors Meetings,
Committees and Compensation -- Compensation of Directors" beginning on page 130.

PRI'S REASONS FOR THE MERGER AND RECOMMENDATION OF PRI'S BOARD OF DIRECTORS

     In reaching its decision to approve the merger agreement, PRI's board of
directors consulted with PRI's management, as well as with PRI's financial
advisors and legal advisors, and considered information from a variety of
sources, including:

     - the board's familiarity, and that of PRI's management, with the business,
       properties and prospects of Brooks, including the other opportunities
       available to PRI if the proposed merger did not occur;

                                        62


     - its exploration, with the assistance of PRI's financial advisor, Morgan
       Stanley, of the strategic alternatives available to PRI, including the
       possibility of a business combination with Brooks, a merger of equals
       with another company in the semiconductor manufacturing equipment
       industry, the viability of any other business combinations, business
       ventures or strategic acquisitions, and the alternative of remaining an
       independent company, both with and without a convertible debt financing
       or other capital-raising transaction, and its assessment of the risks and
       potential rewards associated with each of these strategic alternatives.

     - current financial market conditions and historical market prices,
       volatility and trading information about the Brooks common stock and PRI
       common stock;

     - the relative competitive positions of Brooks and PRI and the expected
       competitive position of the combined company;

     - consultations with PRI's management and financial, legal and accounting
       advisors concerning the business, technology, products and services,
       operations, financial condition, organizational structure and competitive
       positions of Brooks and PRI on both an historical and prospective basis;

     - discussions with PRI's management and financial, legal and accounting
       advisors regarding the results of their due diligence investigations of
       Brooks;

     - information from PRI's management and from independent research reports
       from industry analysts regarding trends in the semiconductor
       manufacturing equipment industry, including the relative degree to which
       the current economic downturn is expected to affect Brooks and PRI and
       the likelihood of consolidation among semiconductor manufacturing
       equipment suppliers as a result of current market conditions;

     - the analyses and presentation of Morgan Stanley regarding the financial
       aspects of the proposed merger, including information regarding the
       exchange ratio pursuant to the merger agreement, the implied premium,
       based on recent and historical market prices of the Brooks common stock,
       over the recent and historical prices of the PRI common stock, and how
       this premium compared to price premiums in recent comparable transactions
       involving semiconductor manufacturing equipment companies;

     - the opinion of Morgan Stanley that, as of October 23, 2001 and based upon
       and subject to the assumptions, qualifications and limitations set forth
       in the opinion, the exchange ratio pursuant to the merger agreement was
       fair, from a financial point of view, to the holders of PRI common stock.
       A copy of Morgan Stanley's written opinion is attached as Appendix F to
       this joint proxy statement/prospectus;

     - the terms and conditions of the merger agreement, including the
       termination fee payable to Brooks under specified circumstances and the
       ability of PRI to negotiate other unsolicited strategic transaction
       proposals if the PRI board of directors determines in good faith, after
       consultation with its outside legal counsel, that it is necessary to do
       so in order to act in a manner consistent with the board's fiduciary
       duties to the PRI stockholders under applicable law and, after
       consultation with its financial advisor, that the proposal is reasonably
       likely to lead to a proposal that is more favorable to the PRI
       stockholders than the merger;

     - the board's assessment, based on information and assistance from PRI's
       management, of the likely impact of the merger on PRI's customers and
       employees; and

     - the terms and conditions of voting agreements of PRI's directors and
       executive officers, which require them to vote their shares of PRI common
       stock in favor of the merger agreement and against any competing
       proposal.

                                        63


     In reaching its decision to approve the merger agreement and to recommend
that the PRI stockholders vote to approve the merger proposal, PRI's board of
directors identified the following potential benefits of the merger for PRI and
its stockholders, that, taken as a whole, supported its decision:

     - the board's belief that under current market conditions the size of a
       semiconductor manufacturing equipment company is an important determinant
       of its ability to achieve and sustain profitability and revenue and
       earnings growth;

     - the fact that the merger will result in a substantially larger company,
       and the fact that successful implementation of PRI's "integrated
       solution" strategy depends on a broad product and service offering that
       can only be sustained by a larger and full-service company;

     - the expectation that the combined company will have a more substantial
       product line that will enable the combined company to occupy a stronger
       market position in key areas that are important for PRI's "integrated
       solution" strategy;

     - the opportunity for operational synergies and economies of scale and the
       anticipated savings and benefits from those synergies and economies of
       scale;

     - the anticipated impact of the merger on the combined company's financial
       resources, and its ability to fund additional sales, marketing and
       product development activities;

     - the opportunity to capitalize on each company's strong customer and
       partner relationships and established reputation to provide additional
       solutions to each company's existing customers;

     - the risks associated with remaining independent in light of apparently
       increasing consolidation and competition among suppliers of semiconductor
       manufacturing equipment;

     - the fact that PRI stockholders will have the opportunity to participate
       in the potential for growth of the combined company after the merger;

     - the fact that the combined company will have a significantly larger
       market capitalization and public float than PRI alone, which could result
       in greater investment research coverage of the combined company by
       industry analysts, and could also enable PRI stockholders who exchange
       their PRI common stock for Brooks common stock in the merger to obtain a
       more liquid investment;

     - the board's judgment that the premium to be paid to the PRI stockholders
       was reasonable in light of PRI's recent operating performance, current
       industry and financial market conditions, the relative contributions
       expected to be made by the two companies to the results of operations of
       the combined company, recent comparable transactions and the historical
       trading prices and volatility of the common stock of the two companies;
       and

     - the fact that the merger will be tax-free to PRI's U.S. stockholders who
       exchange their shares in the merger (except to the extent they receive
       cash for any fractional shares).

PRI's board of directors also considered and explored opportunities that might
exist to pursue other potential business combinations. For example, PRI
conducted mutual due diligence investigations and preliminary negotiations with
another semiconductor manufacturing equipment supplier.

     In its deliberations concerning the merger, PRI's board of directors also
identified and considered a number of risks and potentially negative factors,
including the following:

     - the risk that the combined company will be unable to successfully
       integrate the employees and the operations of Brooks and PRI;

     - the loss of control that would result from the fact that the combined
       company's board of directors will consist of seven directors, only two of
       which will be designated by PRI;

     - the possible adverse effects of the public announcement of the merger on
       the sales of Brooks and PRI and their respective relationships with their
       employees, suppliers and strategic partners;

     - the significant costs that have been and will be incurred by PRI in
       seeking to consummate the merger which PRI currently estimates at
       approximately $11.5 million;

     - the risk that the per share value of the consideration to be received in
       the merger could decline significantly from the value immediately before
       the announcement of the merger because the

                                        64


       exchange ratio will not be adjusted for changes in the market price of
       the PRI common stock or the Brooks common stock;

     - the risk that the integration of PRI and Brooks will be an expensive,
       complex and time-consuming process that could disrupt the business of
       either or both companies if not completed in a timely and efficient
       manner;

     - the risk that the potential benefits of the merger may not be realized;

     - the risk that the merger might not be consummated and the potential
       adverse effects of the failure to consummate the merger on:

      - PRI's operating results;

      - the trading price of PRI common stock;

      - PRI's ability to attract and retain key management and other personnel;

     - the decreased likelihood that PRI would receive a third-party acquisition
       proposal because of the termination fee and, to a lesser extent, the
       voting agreements that were executed by PRI's directors and executive
       officers; and the risk that if the merger agreement is terminated under
       some circumstances, PRI will have to pay substantial fees and expenses;
       and

     - other applicable risks described in this joint proxy statement/prospectus
       under the heading "Risk Factors."

     After due consideration, PRI's board of directors concluded that the
potential benefits to PRI and its stockholders of the merger far outweighed the
risks associated with the merger.

     Although the discussion summarizes all the material factors discussed by
the board at meetings of the board, this discussion is not an exhaustive list of
all the factors considered by PRI's board of directors. In view of the wide
variety of factors considered in connection with the board's evaluation of the
merger and the complexity of these matters, PRI's board of directors did not
quantify or otherwise assign relative weights to the positive or negative
factors described above. Rather, PRI's board made its determination based on the
totality of the information it considered. The members of the board were aware
that, as described below under "Brooks and PRI Proposal No. 1 -- Approval of
Adoption of the Merger Agreement and the Merger -- Interests of PRI's Management
in the Merger and Potential Conflicts of Interests," some of the directors and
executive officers of PRI have interests in the merger in addition to, or
different from, their interests as stockholders of PRI, and the board considered
these interests in deciding to recommend the transaction.

     PRI and Brooks cannot assure you that any of the expected results,
synergies, opportunities or other benefits described in this section will be
achieved as a result of the merger.

     PRI's board of directors has unanimously approved the merger agreement, the
merger and the other transactions contemplated by the merger agreement. PRI's
board of directors believes that the terms of the merger agreement are fair to
and in the best interests of PRI and its stockholders and recommends that PRI
stockholders vote FOR the merger proposal.

     If the merger is not completed, PRI intends to continue as an independent
public company and may pursue other strategic transactions or alternatives to
enhance stockholder value.

OPINION OF PRI'S FINANCIAL ADVISOR

     Pursuant to a letter dated as of September 25, 2000, as amended, PRI
retained Morgan Stanley & Co. Incorporated to provide financial advisory
services and a financial opinion letter in connection with the merger. Morgan
Stanley was selected by PRI's board of directors to act as PRI's financial
advisor based on Morgan Stanley's qualifications, expertise and reputation and
its knowledge of the business and affairs of PRI and the industry in general.

     At the October 23, 2001 meeting of the PRI board of directors, Morgan
Stanley rendered its oral opinion that, as of such date and based upon and
subject to the various considerations set forth in its

                                        65


opinion, the exchange ratio pursuant to the merger agreement was fair from a
financial point of view to the holders of shares of PRI common stock. Morgan
Stanley confirmed its opinion by delivery to the PRI board of directors of a
written opinion dated October 23, 2001.

     THE FULL TEXT OF THE MORGAN STANLEY OPINION, DATED AS OF OCTOBER 23, 2001,
WHICH SETS FORTH, AMONG OTHER THINGS, THE ASSUMPTIONS MADE, PROCEDURES FOLLOWED,
MATTERS CONSIDERED AND LIMITATIONS ON THE REVIEW UNDERTAKEN, IS ATTACHED AS
APPENDIX F TO THIS JOINT PROXY STATEMENT/PROSPECTUS. THE MORGAN STANLEY OPINION
IS DIRECTED TO THE PRI BOARD AND ADDRESSES ONLY THE FAIRNESS OF THE EXCHANGE
RATIO FROM A FINANCIAL POINT OF VIEW TO THE HOLDERS OF SHARES OF PRI COMMON
STOCK AS OF THE DATE OF SUCH OPINION AND DOES NOT ADDRESS ANY OTHER ASPECT OF
THE MERGER. THE SUMMARY OF THE MORGAN STANLEY OPINION SET FORTH IN THIS JOINT
PROXY STATEMENT/PROSPECTUS IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO THE FULL
TEXT OF THE MORGAN STANLEY OPINION ATTACHED AS APPENDIX F TO THE JOINT PROXY
STATEMENT/PROSPECTUS, WHICH SHOULD BE READ CAREFULLY AND IN ITS ENTIRETY.

     In arriving at the Morgan Stanley opinion, Morgan Stanley, among other
things:

     - reviewed certain publicly available financial statements and other
       information of Brooks and PRI, respectively;

     - discussed certain internal financial statements and other financial and
       operating data concerning Brooks and PRI prepared by the management of
       Brooks and PRI, respectively;

     - discussed certain financial projections of Brooks and PRI prepared by the
       management of Brooks and PRI, respectively;

     - discussed the past and current operations and financial condition and the
       prospects of Brooks and PRI, including information relating to certain
       strategic, financial and operational benefits anticipated from the
       merger, with senior executives of Brooks and PRI, respectively;

     - reviewed the pro forma impact of the merger on Brooks' earnings per
       share;

     - discussed potential strategic and operational benefits of the merger with
       senior executives of Brooks and PRI;

     - reviewed the reported prices and trading activity for the PRI common
       stock and the Brooks common stock;

     - compared the financial performance of PRI and Brooks and the prices and
       trading activity of the PRI common stock and the Brooks common stock with
       that of other comparable publicly traded companies and their securities;

     - reviewed the financial terms, to the extent publicly available, of
       certain comparable acquisition transactions;

     - participated in discussions and negotiations among representatives of
       Brooks and PRI and their financial and legal advisors;

     - reviewed the merger agreement and certain related documents; and

     - considered such other factors and performed such other analyses as Morgan
       Stanley deemed appropriate.

     In arriving at the Morgan Stanley opinion, Morgan Stanley assumed and
relied upon, without independent verification, the accuracy and completeness of
the information reviewed by Morgan Stanley for the purposes of its opinion. With
respect to the financial projections, including information relating to certain
strategic, financial and operational benefits anticipated from the merger,
Morgan Stanley assumed that they were reasonably prepared on bases reflecting
the best currently available estimates and judgments of the future financial
performance and prospects of Brooks and PRI. Morgan Stanley relied upon the
assessment by the managements of Brooks and PRI of their ability to retain key
employees. Morgan Stanley also relied upon, without independent verification,
the assessment by PRI's management of Brooks' and PRI's technologies and
products, the timing and risks associated with the integration of Brooks and PRI
and the validity of, and risks associated with, Brooks' and PRI's existing and
future products and technologies.

                                        66


     In addition, Morgan Stanley assumed that the merger will be consummated in
accordance with the terms set forth in the merger agreement, including, among
other things, that the merger will be treated as a tax-free reorganization
and/or exchange, each pursuant to the Internal Revenue Code. Morgan Stanley
later confirmed to PRI that the amendment and restatement of the merger
agreement to include the second merger of PRI with and into Brooks did not
affect the conclusion in the Morgan Stanley opinion. Morgan Stanley has not made
any independent valuation or appraisal of the assets or liabilities of Brooks
and PRI, nor has Morgan Stanley been furnished with any such appraisals. The
Morgan Stanley opinion is necessarily based on financial, economic, market and
other conditions as in effect on, and the information made available to Morgan
Stanley as of, the date of the Morgan Stanley opinion.

     The following is a brief summary of certain analyses performed by Morgan
Stanley in connection with its oral opinion and its written opinion. Some of
these summaries of financial analyses include information presented in tabular
format. In order to fully understand the financial analyses used by Morgan
Stanley, the tables must be read together with the text of each summary. The
tables alone do not constitute a complete description of the financial analyses.

     Historical Common Stock Performance.  Morgan Stanley's analysis of Brooks'
common stock performance consisted of an historical analysis of closing prices
and trading volumes over the period from January 2, 2001 to October 23, 2001.
During that period, based on closing prices on the Nasdaq National Market, the
Brooks common stock achieved a high closing price per share of $62.61 on April
30, 2001 and a low closing price of $25.22 per share on October 1, 2001.
Additionally, Morgan Stanley noted that the Brooks common stock closed at a
price of $33.11 per share on October 23, 2001. Based on the closing stock prices
of the PRI common stock of $12.54 per share and the Brooks common stock as of
October 23, 2001, and the merger exchange ratio, the implied consideration for
the PRI common stock was approximately $17.22 per share.

     Comparative Stock Price Performance.  Morgan Stanley performed historical
analyses of closing prices of the PRI common stock, the Brooks common stock, the
NASDAQ index, the Asyst Technologies, Inc. common stock and an equally weighted
index of traditional semiconductor capital equipment companies consisting of
Applied Materials, Inc., KLA-Tencor Corp., LAM Research Corp., and Novellus
Systems, Inc. Morgan Stanley compared the performance of such companies and
indices to the performance of the PRI common stock and the Brooks common stock
during such period. Morgan Stanley observed that over the period from January 2,
2001 to October 23, 2001, the traditional semiconductor capital equipment
company index increased 6.4%, the Asyst common stock decreased 28.8%, the Brooks
common stock increased 20.1%, the NASDAQ index decreased 25.6%, and the PRI
common stock decreased 33.1%.

     Comparable Public Company Analysis.  As part of its analysis, Morgan
Stanley compared certain publicly available financial information of certain
semiconductor capital equipment companies as listed below:

              COMPARABLE SEMICONDUCTOR CAPITAL EQUIPMENT COMPANIES


  
ROBOTICS
  -  Asyst Technologies, Inc.
  -  Brooks
  -  PRI

LARGE CAPITAL EQUIPMENT MANUFACTURERS
  -  Applied Materials, Inc.
  -  KLA-Tencor Corp.
  -  LAM Research Corp.
  -  Novellus Systems, Inc.


                                        67


     While noting that none of the comparable public companies listed above are
exactly identical to PRI or Brooks, Morgan Stanley compared the financial
information of those companies to the financial performance of PRI and Brooks.
Such information included the stock trading price divided by the 2002 earnings
per share ("EPS") estimate adjusted for a calendar year end (the "2002E
price/earnings multiple"), aggregate value divided by the 2002 estimated sales
(the "2002E aggregate value/sales") and aggregate value divided by the 2002
estimated gross profit (the "2002E aggregate value/gross profit"). Aggregate
value is defined as the value of the consideration paid per share of common
stock multiplied by the total number of "fully converted shares outstanding" (as
defined) of the company less cash plus the value of any debt, capital lease, and
preferred stock obligations of the company. "Fully converted shares outstanding"
is defined as the number of shares of common stock outstanding plus the total
number of shares of common stock that would be issued upon exercise of any
in-the-money stock options, warrants or convertible debt of the company. The EPS
estimates were derived from First Call mean consensus EPS estimates, while the
gross profit estimates were derived from selected equity research analyst
reports. For the PRI and Brooks 2002 estimated financials, Morgan Stanley used
the First Call mean consensus fiscal year 2002 earnings per share estimates of
($0.75) and ($0.39), respectively.

     The following table presents, as of October 23, 2001, the 2002E
price/earnings multiples, 2002E aggregate value/sales ratio and 2002E aggregate
value/gross profit ratio for the comparable semiconductor capital equipment
companies:



                                                                 2002E
                             ------------------------------------------------------------------------------
COMPARABLE PUBLIC COMPANIES  AGGREGATE VALUE/SALES   AGGREGATE VALUE/GROSS PROFIT   PRICE/EARNINGS MULTIPLE
---------------------------  ---------------------   ----------------------------   -----------------------
                                                                           
ROBOTICS
- Asyst Technologies,
  Inc. .................             1.3x                        3.3x                           NM
- Brooks................             2.3x                        5.5x                           NM
- PRI...................             1.1x                        3.2x                           NM

LARGE CAPITAL EQUIPMENT MANUFACTURERS
- Applied Materials,
  Inc. .................             5.1x                       11.4x                       135.5x
- KLA-Tencor Corp. .....             3.6x                        7.3x                        35.3x
- LAM Research Corp. ...             2.0x                        5.4x                           NM
- Novellus Systems, Inc. ..          3.0x                        5.7x                        39.5x


     Morgan Stanley concluded that the acquisition multiples implied by the
exchange ratio pursuant to the merger agreement were in line with trading
multiples of comparable public companies within the semiconductor capital
equipment sector.

     No company utilized in the comparable company comparison analysis is
identical to PRI or Brooks. In evaluating the peer group, Morgan Stanley made
judgments and assumptions with regard to industry performance, general business,
economic, market and financial conditions and other matters, many of which are
beyond the control of PRI or Brooks. These other matters include the impact of
competition on the business of PRI or Brooks and the industry generally,
industry growth and the absence of any adverse material change in the financial
condition and prospects of PRI or Brooks or in the industry or financial markets
in general. Mathematical analysis, such as determining the average or median, is
not in itself a meaningful method of using peer group data.

     Pro Forma Contribution Analysis.  Morgan Stanley analyzed the pro forma
financial contribution of each of PRI and Brooks to the combined company. Such
analysis included relative contributions of net revenue, gross profit, net
income and market value of equity at various projected time periods. For the
2001 Brooks financials, Morgan Stanley used an average of equity research
analyst estimates for fiscal year

                                        68


2001. For 2002, Morgan Stanley used the estimates described earlier. The
following table presents the relative contribution of PRI's revenues, gross
profit, net income and market value of equity to Brooks:

                                                                RELATIVE
                                                              CONTRIBUTION
                                                              ------------
                                                              PRI   BROOKS
                                                              ---   ------

Revenues
  2001......................................................  46%     54%
  Q3 2001...................................................  49%     51%
  Q4 2001...................................................  46%     54%
  2002......................................................  45%     55%

Gross Profit
  2001......................................................  29%     71%
  Q3 2001...................................................  33%     67%
  Q4 2001...................................................  36%     64%
  2002......................................................  41%     59%

Net Income
  2000......................................................  37%     63%

Market Value of Equity
  As of October 23, 2001....................................  32%     68%


     The implied offer prices in the above table did not take into account any
estimates by the managements of Brooks or PRI of the synergies or cost savings
anticipated from the merger, nor did they take into account any accounting
adjustments or potential changes in capital structure as a result of the merger.
Morgan Stanley concluded that the PRI ownership split of the combined entity of
40% implied by the 0.52x merger exchange ratio is consistent with the relative
financial contributions of PRI to the combined entity.

     Exchange Ratio Analysis.  Morgan Stanley analyzed the ratios of the closing
prices of the PRI common stock divided by the corresponding prices of Brooks
common stock over various periods during the period from January 2, 2001 to
October 23, 2001. Morgan Stanley observed the following implied exchange ratios
and implied equity value premiums over various periods ending on October 23,
2001 and as of October 23, 2001:



                                        AVERAGE IMPLIED    PRI FULLY DILUTED     IMPLIED EQUITY
PERIOD ENDING OCTOBER 23, 2001          EXCHANGE RATIO    OWNERSHIP IN BROOKS   PREMIUM TO 0.52X
------------------------------          ---------------   -------------------   ----------------
                                          F                                  
As of 10/23/01........................       0.38x                32%                  37%
Prior 10 Days.........................       0.37x                31%                  42%
Prior 30 Days.........................       0.37x                31%                  41%
Prior 60 Days.........................       0.37x                31%                  41%
Prior 90 Days.........................       0.37x                31%                  43%


     Morgan Stanley noted that over the 6 months before it conducted its
analysis, the average exchange ratio between PRI and Brooks is at 0.41x, which
is lower than the 0.52x merger exchange ratio to be paid by Brooks.

                                        69


     Analysis of Selected Precedent Transactions.  Morgan Stanley reviewed a
number of recent transactions in the semiconductor and semiconductor capital
equipment industries that consisted of the following:



ANNOUNCEMENT
    DATE                      ACQUIREE                               ACQUIRER
------------                  --------                               --------
                                                 
8/1/01         - General Semiconductor, Inc.           - Vishay Intertechnology, Inc.
3/26/01        - C-Cube Microsystems Inc.              - LSI Logic Corporation
1/29/01        - Dallas Semiconductor Corporation      - Maxim Integrated Products, Inc.
10/27/00       - TelCom Semiconductor, Inc.            - Microchip Technology Incorporated
10/2/00        - Silicon Valley Group, Inc.            - ASM Lithography Holding NV
10/2/00        - Applied Science and Technology, Inc.  - MKS Instruments, Inc.
8/28/00        - MMC Networks, Inc.                    - Applied Micro Circuits Corporation
8/24/00        - Nogatech, Inc.                        - Zoran Corporation
7/12/00        - Quantum Effect Devices, Inc.          - PMC-Sierra, Inc.
6/28/00        - CFM Technologies, Inc.                - Mattson Technology, Inc.
6/21/00        - Burr-Brown Corporation                - Texas Instruments Corporation
2/29/00        - CVC, Inc.                             - Veeco Instruments, Inc.
2/7/00         - Ortel Corporation                     - Lucent Technologies Inc.
1/3/00         - Etec Systems, Inc.                    - Applied Materials, Inc.
12/20/99       - Maker Communications Inc.             - Conexant Systems, Inc.
7/26/99        - Unitrode Corporation                  - Texas Instruments Corporation
3/4/99         - Level One Communications Inc.         - Intel Corporation
2/19/99        - SEEQ Technology Incorporated          - LSI Logic Corporation
12/14/98       - STB Systems, Inc                      - 3Dfx Interactive, Inc.
11/19/98       - Integrated Process Equipment Corp.    - SpeedFam-IPEC, Inc.
7/28/97        - Cyrix Corporation                     - National Semiconductor Corporation


     The information analyzed by Morgan Stanley for the precedent transactions
included exchange ratio premium to 30-, 60-, and 90-day trading averages prior
to announcement of the respective transaction. The following table represents
the median, high and low of the 30-, 60-, and 90-day trading averages for the
selected precedent transactions:



                                                      EXCHANGE RATIO PREMIUM TO:
                                                      ---------------------------
                                                      30-DAY    60-DAY    90-DAY
                                                      AVERAGE   AVERAGE   AVERAGE
                                                      -------   -------   -------
                                                                 
Precedent Transactions
  Median............................................    49%        38%       34%
  High..............................................    93%       109%      175%
  Low...............................................    26%        10%        3%


     Morgan Stanley concluded that the exchange ratio premiums implied for PRI
of 41%, 41%, and 43%, for the 30-, 60-, and 90-day averages, respectively, were
consistent with the median exchange ratio premium paid for other similar
semiconductor-related transactions. However, no transaction utilized as a
comparison in the precedent transactions analysis is identical to the merger. In
evaluating the precedent transactions, Morgan Stanley made judgments and
assumptions regarding industry performance, general business, economic, market
and financial conditions and other matters, many of which are beyond the control
of PRI or Brooks, such as the impact of competition on PRI or Brooks and the
industry generally, industry growth and the absence of any material adverse
change in the financial condition and prospects of PRI or Brooks or the industry
or in the financial markets in general. Mathematical analysis such as

                                        70


determining the average or median is not in itself a meaningful method of using
comparable transaction data.

     Pro Forma Analysis of the Merger.  Morgan Stanley analyzed the pro forma
impact of the merger on EPS for Brooks for the estimated calendar year 2002. The
pro forma results were calculated as if the merger had closed at the beginning
of the 2002 first quarter, and were based on estimated earnings derived from
publicly available research estimates for PRI and Brooks as described under
Comparable Public Company Analysis.

     The following table presents the pro forma 2002 estimated Brooks EPS and
accretion/(dilution) based on a range of pretax operating synergies at an
exchange ratio of 0.52x:



                                                              PRO FORMA 2002E
                                                                 BROOKS EPS
PRETAX                                                      --------------------
SYNERGIES                                                   $ EPS   $ ACCR./DIL.
---------                                                   -----   ------------
                                                              
No Synergies..............................................  (0.31)     (0.23)
$10MM Syn. ...............................................  (0.10)     (0.02)
$20MM Syn. ...............................................   0.11       0.19
$30MM Syn. ...............................................   0.31       0.39


     Morgan Stanley concluded that, with approximately $20 million in pretax
annual synergies, on a U.S. generally accepted accounting principles basis, the
merger would be accretive to Brooks' earnings per share in calendar year 2002.

     The preparation of a fairness opinion is a complex process and is not
necessarily susceptible to a partial analysis or summary description. In
arriving at its opinion, Morgan Stanley considered the results of all of its
analyses as a whole and did not attribute any particular weight to any
particular analysis or factor considered by it. Furthermore, Morgan Stanley
believes that selecting any portion of Morgan Stanley's analyses, without
considering all its analyses, would create an incomplete view of the process
underlying the Morgan Stanley opinion and that the totality of the factors
considered and analyses performed by Morgan Stanley in connection with its
opinion operated collectively to support Morgan Stanley's determination as to
the fairness, from a financial point of view, of the exchange ratio to holders
of shares of PRI common stock. In addition, Morgan Stanley may have given
various analyses and factors more or less weight than other analyses and
factors, and may have deemed various assumptions more or less probable than
other assumptions, so that the ranges of valuations resulting from any
particular analysis described above should not be taken to be Morgan Stanley's
view of the actual value of PRI or Brooks.

     In performing its analysis, Morgan Stanley made numerous assumptions with
respect to industry performance, general business and economic conditions and
other matters, many of which are beyond the control of PRI or Brooks. Any
estimates contained in the analyses performed by Morgan Stanley are not
necessarily indicative of actual values, which may be significantly more or less
favorable than those suggested by such analyses. Such analyses were prepared
solely as a part of Morgan Stanley's analysis of the fairness from a financial
point of view of the exchange ratio pursuant to the merger agreement and were
provided to the PRI board of directors in connection with the delivery of the
Morgan Stanley opinion to PRI. The analyses do not purport to be appraisals of
value or to reflect the prices at which PRI or Brooks might actually be sold or
trade. In addition, as described above, the Morgan Stanley opinion was one of
the many factors taken into consideration by the PRI board of directors in
making its determination to approve the merger. The exchange ratio of 0.52x
pursuant to the merger agreement was determined through arm's-length
negotiations between PRI and Brooks and was approved by the PRI board of
directors. Consequently, the Morgan Stanley analyses as described above should
not be viewed as determinative of the opinion of the PRI board of directors with
respect to the value of PRI or of whether the PRI board of directors would have
been willing to agree to different consideration.

     Morgan Stanley is an internationally recognized investment banking and
advisory firm. Morgan Stanley, as part of its investment banking business, is
regularly engaged in the valuation of businesses and their securities in
connection with mergers and acquisitions, negotiated underwritings, competitive
biddings,

                                        71


secondary distributions of listed and unlisted securities, private placements
and valuations for corporate, estate and other purposes. Morgan Stanley may
continue to provide investment banking services to the combined entity in the
future. In the ordinary course of its trading, brokerage and financing
activities, Morgan Stanley and its affiliates may, at any time, have a long or
short position in, and buy and sell the debt or equity securities and senior
loans of PRI or Brooks for its account or the account of its customers. Morgan
Stanley and its affiliates have, in the past, provided financial advisory and
financing services to PRI and its affiliates and have received fees for the
rendering of such services. Since January 2000, Morgan Stanley has received
approximately $1.9 million in fees from PRI in respect of its services.

     Pursuant to an engagement letter dated as of September 25, 2000, as
amended, Morgan Stanley provided financial advisory services and a financial
fairness opinion in connection with the merger, and PRI agreed to pay Morgan
Stanley fees that are based on the aggregate value of the merger at closing and
that are contingent upon completion of the merger. If the price of Brooks'
common stock remains in the trading range of $40 to $50 per share immediately
prior to the closing of the transaction, Morgan Stanley's fees will be
approximately $7.2 million to $9.1 million. PRI also agreed to reimburse Morgan
Stanley for expenses incurred by Morgan Stanley in performing its services. In
addition, PRI has also agreed to indemnify Morgan Stanley and its affiliates,
their respective directors, officers, agents and employees and each person, if
any, controlling Morgan Stanley or any of its affiliates against certain
liabilities and expenses, including liabilities under the federal securities
laws, related to or arising out of Morgan Stanley's engagement and any related
transactions.

     The merger agreement does not contemplate or provide for Morgan Stanley to
update its opinion dated October 23, 2001. PRI does not currently intend to
request an updated opinion from Morgan Stanley. However, if there were a
material amendment to the merger agreement before completion of the merger that
results in a resolicitation of proxies for PRI shareholder vote on the merger
agreement and the merger, PRI would consider at that time whether it was
appropriate to obtain an updated opinion from Morgan Stanley.

INTERESTS OF PRI'S MANAGEMENT IN THE MERGER AND POTENTIAL CONFLICTS OF INTEREST

     In considering the recommendation of PRI's board of directors with respect
to the proposed merger, PRI stockholders should note that some of PRI's
directors and executive officers have interests in the merger that are different
from, or in addition to, their interests solely as PRI stockholders. These
interests may create potential conflicts of interest. The boards of directors of
Brooks and PRI were aware of these interests and took these interests into
account in approving the proposed merger and the transactions contemplated by
the merger agreement.

     Voting Agreements.  Certain directors and executive officers of PRI have
entered into voting agreements with Brooks in which they agreed, among other
things, to vote all PRI shares over which they have voting power to approve and
adopt the merger agreement, the merger and all agreements and actions related to
the merger. For a more complete description of the voting agreements, see
"Related Agreements -- Voting Agreements" beginning on page 91.

     Election of directors.  Under the terms of the merger agreement, Brooks
will increase the size of its board of directors to seven directors and appoint
Mitchell G. Tyson, PRI's president and chief executive officer, and Kenneth M.
Thompson, a current member of the board of directors of PRI, to the board of
directors of Brooks.

     PRI stock options.  The stock options held by each of PRI's directors and
executive officers and all of its employees will be assumed by Brooks in the
merger and become exercisable, in accordance with their terms, for shares of
Brooks common stock. See "The Merger Agreement -- Treatment of PRI Stock Options
and Warrants."

     Employment and retention agreements.  A number of PRI's executive officers
have agreements that will entitle them to stated benefits after the closing of
the merger. For example, Mordechai Wiesler, PRI's chairman of the board, has an
employment agreement under which he will receive a severance payment of

                                        72


$100,000, acceleration of his options and other benefits as a result of the
merger. Mitchell G. Tyson, PRI's president and chief executive officer, has an
employment agreement with Brooks that will become effective upon the closing of
the merger, providing him with a salary of $182,000 paid over a period of six
months, a potential bonus equal to twice that amount, acceleration of his
options and a payment of $546,000 per year for two years in exchange for his
agreement not to compete with Brooks. In addition, numerous of PRI's key
employees and directors, including Mr. Wiesler, have retention agreements with
PRI under which they may receive severance payments and other benefits as a
result of the merger, including the accelerated vesting of outstanding options.
The fair market value of these accelerated options (using the Black-Scholes
option pricing model) as of December 31, 2001 is approximately $4.5 million for
Mr. Tyson, including $680,000 attributable to the option granted to him on
October 8, 2001, and $2.1 million for Mr. Wiesler. For more complete information
about these agreements, see "Related Agreements -- Employment Agreement with
Mitchell G. Tyson" and "PRI Executive Compensation -- Employment and Retention
Agreements."

     Indemnification of officers and directors.  In the merger agreement, Brooks
agreed to maintain the rights to indemnification, exculpation and reimbursement
of expenses of the persons who were officers or directors of PRI or any of PRI's
subsidiaries before the merger to the same extent as these persons had these
rights under PRI's or the respective subsidiary's charter and bylaws and any
indemnification contract in effect on the date of the merger agreement. In
addition, Brooks agreed that, from and after the merger, persons who become
directors or officers of Brooks in connection with the merger will be entitled
to rights and protections with respect to indemnity, exculpation and
reimbursement of expenses at least as favorable to them as the rights and
protections that the directors and officers of Brooks had before the merger.

MATERIAL FEDERAL INCOME TAX CONSIDERATIONS

     The following is a summary of the material United States federal income tax
consequences generally applicable to a stockholder of PRI who is a "United
States person," as defined for United States federal income tax purposes, and
who holds his, her or its shares of PRI common stock as a capital asset.

     For United States federal income tax purposes, a "United States person" is:

     - a United States citizen or resident alien as determined under the
       Internal Revenue Code;

     - a corporation or partnership (as defined by the Internal Revenue Code)
       that is organized under the laws of the United States, any state or the
       District of Columbia;

     - an estate, the income of which is subject to United States federal income
       taxation regardless of its source; or

     - a trust, if a court within the United States is able to exercise primary
       supervision over its administration and at least one United States person
       is authorized to control all of its substantial decisions.

     This summary is based on the Internal Revenue Code, existing and proposed
Treasury Regulations and judicial and administrative determinations, as each is
in effect as of the date of this joint proxy statement/prospectus. All of the
foregoing are subject to change at any time, possibly with retroactive effect,
and all are subject to differing interpretation. No advance ruling has been
sought or obtained from the Internal Revenue Service regarding the United States
federal income tax consequences of the merger. The statements in this joint
proxy statement/prospectus and the opinions of counsel that are described in
this joint proxy statement/prospectus are not binding on the Internal Revenue
Service or a court. As a result, none of Brooks, Pontiac Acquisition Corp., nor
PRI can guarantee any PRI stockholder that the tax considerations or opinions
described here will not be challenged by the Internal Revenue Service or
sustained by a court if so challenged.

     This summary does not address aspects of United States taxation other than
United States federal income taxation. It does not address all aspects of United
States federal income taxation and it does not address federal income tax
considerations that may apply to stockholders subject to special rules under the
Internal Revenue Code, including, for example, persons who acquired shares of
PRI common stock as a

                                        73


result of the exercise of employee stock options or otherwise as compensation,
tax-exempt organizations, financial institutions, broker-dealers, insurance
companies, persons having a "functional currency" other than the United States
dollar, persons who hold their PRI shares as part of a straddle, wash sale,
hedging or conversion transaction, and certain former United States citizens and
long-term residents. In addition, this summary and the opinions described here
do not address any state, local or foreign tax consequences of the mergers.

EACH PRI STOCKHOLDER IS URGED TO CONSULT AND RELY ON HIS, HER OR ITS TAX
ADVISORS WITH RESPECT TO THE UNITED STATES FEDERAL, STATE AND LOCAL, AND FOREIGN
TAX CONSEQUENCES OF THE MERGERS BASED UPON THE STOCKHOLDER'S PARTICULAR
CIRCUMSTANCES.

  PRI COMMON STOCK

     Brooks has received an opinion from its special tax counsel, Ropes & Gray,
to the effect that, for United States federal income tax purposes, the merger of
Pontiac Acquisition Corp., a wholly owned subsidiary of Brooks, with and into
PRI and the immediate subsequent merger of PRI with and into Brooks will
constitute a reorganization within the meaning of Section 368 of the Internal
Revenue Code. PRI has received an opinion from its tax counsel, Foley, Hoag &
Eliot LLP, to the same effect. These opinions have been filed with the
registration statement in which this joint proxy statement/prospectus is
included. It is a condition to closing of the merger that tax counsel issue
closing opinions confirming their conclusions on the closing date. In the event
that, before the stockholder meetings, it is determined that additional tax
opinions cannot be issued and Brooks and PRI are willing to waive the opinion
delivery requirements, but the completion of the merger would result in tax
consequences that are so materially different as to affect the stockholders'
decision on the merger, or if it is determined that the transaction will not
constitute a tax-free reorganization, we will provide to each holder of record
on the record date a new, complete joint proxy/prospectus describing the
differences in tax consequences from those described herein. We will also
provide a new proxy card along with the new joint proxy statement/prospectus in
the event that any stockholder wishes to revoke any earlier proxy and change
his, her or its vote. If, after the stockholder meetings, but prior to the
completion of the merger, a material difference in tax consequences is
discovered, or it is determined that the transaction will not constitute a
tax-free reorganization, it would be necessary to reconvene new stockholder
meetings. In rendering their opinions in connection with this joint proxy
statement/prospectus, tax counsel have received and relied upon, and in
rendering their opinions in connection with the closing tax counsel will receive
and rely upon, certificates containing representations regarding past, current
and future matters that are customary for transactions of this nature. If any of
the representations is inaccurate or incorrect, the conclusions stated in these
opinions could be affected.

     The following are the material United States federal income tax
consequences that will generally result from treatment of the merger and the
immediate subsequent merger as a reorganization described in Section 368 of the
Internal Revenue Code:

     - a PRI stockholder will recognize no gain or loss upon the conversion of
       his, her or its shares of PRI common stock into shares of Brooks common
       stock, except with respect to cash received in lieu of a fractional share
       interest in Brooks common stock;

     - a PRI stockholder's aggregate tax basis in the shares of Brooks common
       stock that such PRI stockholder receives in the merger in exchange for
       his, her or its shares of PRI common stock will be the same as his, her
       or its aggregate tax basis in those shares of PRI common stock, reduced
       by any amount of tax basis allocable to a fractional share interest in
       Brooks common stock for which cash is received;

     - a PRI stockholder's holding period for the shares of Brooks common stock
       that such PRI stockholder receives in the merger in exchange for his, her
       or its shares of PRI common stock will include his, her or its holding
       period for those shares of PRI common stock;

     - a PRI stockholder who receives cash in lieu of a fractional share
       interest in Brooks common stock will be treated as having received such
       cash in exchange for such fractional share interest and generally will
       recognize capital gain or loss on such deemed exchange, in an amount
       equal to the

                                        74


difference between the amount of cash received and the basis of the PRI common
stock allocable to such fractional share;

     - if a PRI stockholder exercises dissenters' rights with respect to a share
       of PRI common stock and receives payment for such share in cash, such PRI
       stockholder generally will recognize gain or loss measured by the
       difference between his, her or its basis in such share and the amount of
       cash received, provided that the payment is neither essentially
       equivalent to a dividend within the meaning of Section 302 of the
       Internal Revenue Code nor has the effect of a distribution of a dividend
       within the meaning of Section 356(a)(2) of the Internal Revenue Code; and

     - none of Brooks, PRI, Pontiac Acquisition Corp., or any stockholder of
       Brooks will recognize any gain or loss as a result of the merger or the
       immediate subsequent merger of PRI into Brooks.

     If the Internal Revenue Service were to challenge successfully the
treatment of the merger as set forth in the opinions described above, then a
holder of PRI common stock would recognize taxable gain or loss with respect to
his, her or its shares of PRI common stock surrendered in the merger, in an
amount equal to the difference between (i) the fair market value of the shares
of Brooks common stock that he, she or it receives in the merger plus the amount
of cash received in lieu of fractional shares, and (ii) such PRI stockholder's
adjusted tax basis in his, her or its shares of PRI common stock. In such case,
such PRI stockholder's aggregate tax basis in the shares of Brooks common stock
so received would equal the fair market value of such shares, and his, her or
its holding period for such shares would begin the day after the mergers.

  NET OPERATING LOSS AND TAX CREDIT CARRYFORWARDS OF PRI AND BROOKS

     As of September 30, 2001, PRI had approximately $84.2 million of net
operating loss carryforwards available. Subject to current limitations with
respect to approximately $1.2 million of these losses, PRI ordinarily could
carry these net operating losses forward to offset future taxable income for 20
years (15 years for net operating losses incurred in tax years beginning before
1998) after they were incurred. However, the mergers are likely to limit the
ability of Brooks and PRI to utilize PRI's pre-merger net operating losses to
offset post-merger income. In particular, under Section 382 of the Internal
Revenue Code, in any taxable year after the mergers Brooks and PRI will be able
to use an amount of PRI's pre-merger net operating losses equal only to the
product of (i) the long-term tax-exempt bond rate (which would be 4.74% if the
mergers closed in December 2001) in effect at the effective time of the mergers,
and (ii) the fair market value of PRI's common stock immediately before the
mergers. Similar limitations will apply to post-merger use of PRI's pre-merger
tax credit carryforwards under Section 383 of the Internal Revenue Code. These
annual limitations could be reduced under various special rules. For example,
the annual limitations could be reduced if PRI's 2000 public offering were
treated as part of a plan that had a principal purpose of avoiding or increasing
these limitations. PRI does not believe that its 2000 public offering will be
treated as part of such a plan.

     As of September 30, 2001, Brooks had federal and state net operating loss,
federal and state research credit and federal foreign tax credit carryforwards
of approximately $18.5 million, $7.6 million and $4.1 million, respectively. The
carryforwards expire at various dates through 2021. Sections 382 and 383 of the
Internal Revenue Code may impose a limit on the use of Brook's pre-merger
federal carryforwards in determining the combined tax liability of Brooks and
PRI after the merger. Brooks believes this limitation will not materially defer
the time that the Brooks carryforwards would otherwise be used after taking into
account the use of the PRI net operating losses described above.

MATERIAL CANADIAN FEDERAL INCOME TAX CONSIDERATIONS

     In the opinion of Blake, Cassels & Graydon LLP, the following is a summary
of the principal Canadian federal income tax considerations generally applicable
to holders of PRI Canada exchangeable shares as a result of the mergers. The
summary applies only to stockholders who, for purposes of the Income Tax Act
(Canada) or the Canadian Tax Act, are resident in Canada, hold their PRI Canada
exchangeable shares and will hold their shares of Brooks common stock as capital
property, deal at arm's

                                        75


length with Brooks, PRI, PRI Canada and PRI's Ontario subsidiary, and are not
affiliated with Brooks, PRI, PRI Canada or PRI's Ontario subsidiary. This
summary does not apply to a holder with respect to whom PRI or Brooks is or will
be a foreign affiliate within the meaning of the Canadian Tax Act. This summary
deals only with certain consequences of the mergers, and is not intended as, and
should not be construed as a complete summary of all Canadian federal income tax
considerations applicable to the holding of PRI Canada exchangeable shares or
shares of Brooks common stock or the exchange of PRI Canada exchangeable shares
for shares of Brooks common stock.

     PRI Canada exchangeable shares will generally be considered to be capital
property to a stockholder unless held in the course of carrying on a business,
in an adventure in the nature of trade or as "mark-to-market property" for
purposes of the Canadian Tax Act. Stockholders resident in Canada whose PRI
Canada exchangeable shares might not otherwise qualify as capital property may
be entitled to obtain such qualification by making the irrevocable election
provided by subsection 39(4) of the Canadian Tax Act. Stockholders who do not
hold their shares as capital property should consult their own tax advisors
regarding their particular circumstances and, in the case of certain "financial
institutions," as defined in section 142.2 of the Canadian Tax Act, the
potential application to them of the "mark-to-market" rules in the Canadian Tax
Act, as the following summary does not apply to such stockholders.

     This summary is based on the current provisions of the Canadian Tax Act,
the Regulations thereunder and counsel's understanding of the current
administrative policies and assessing practices of the Canada Customs and
Revenue Agency, or the CCRA. This summary takes into account all proposed
amendments to the Canadian Tax Act and Regulations publicly announced by the
Minister of Finance before the date hereof and assumes that all such proposed
amendments will be enacted in their present form. However, no assurances can be
given that the proposed amendments will be enacted in the form proposed, or at
all.

     Except for the proposed amendments, this summary does not take into account
or anticipate any changes in law, whether by legislative, administrative or
judicial decision or action, nor does it take into account provincial,
territorial or foreign income tax legislation or considerations, which may
differ from the Canadian federal income tax considerations described herein. No
advance tax ruling has been sought or obtained from the CCRA to confirm the tax
consequences of any of the transactions described herein.

     WHILE THIS SUMMARY IS INTENDED TO ADDRESS THE PRINCIPAL CANADIAN FEDERAL
INCOME TAX CONSIDERATIONS, IT IS OF A GENERAL NATURE ONLY AND IS NOT INTENDED TO
BE, NOR SHOULD IT BE CONSTRUED TO BE, LEGAL, BUSINESS OR TAX ADVICE TO ANY
PARTICULAR STOCKHOLDER. SUCH HOLDERS SHOULD CONSULT THEIR OWN TAX ADVISORS WITH
RESPECT TO THEIR PARTICULAR CIRCUMSTANCES.

     For purposes of the Canadian Tax Act, all amounts must be expressed in
Canadian dollars, including dividends, adjusted cost base and proceeds of
disposition; amounts denominated in United States dollars must be converted into
Canadian dollars based on the United States dollar exchange rate generally
prevailing at the time such amounts arise.

  EFFECT OF MERGERS ON PRI CANADA EXCHANGEABLE SHARES

     As a consequence of the mergers, each PRI Canada exchangeable share will
automatically become exchangeable for 0.52 shares of Brook common stock
following completion of the mergers. A stockholder will not transfer or
otherwise dispose of a PRI Canada exchangeable share by reason only of the
mergers, and the terms of PRI Canada exchangeable shares will not be amended.
Accordingly, a stockholder will not be considered to dispose of PRI Canada
exchangeable shares by reason only of the mergers.

     A stockholder will dispose of ancillary rights (which consist of voting
rights, an automatic exchange right, an exchange right, an exchange put right
and call rights, as detailed in the voting and exchange trust agreement), as a
result of the mergers for proceeds of disposition equal to the fair market value
of the ancillary rights received in exchange. PRI Canada is of the view, and has
advised counsel, that the fair market value of the ancillary rights is nominal.
Such determination of value is not binding on the CCRA, and counsel can express
no opinion on such matters of factual determination.

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  FOREIGN INVESTMENT ENTITY DRAFT LEGISLATION

     On August 2, 2001, the Canadian Minister of Finance released revised draft
legislation to amend the Canadian Tax Act to implement a proposal concerning the
taxation of holdings in "foreign investment entities," or FIEs. In general
terms, the draft legislation applies to any "participating interest" in a FIE.
PRI Canada exchangeable shares and shares of Brooks common stock will be
regarded as participating interests in a FIE if Brooks is a FIE. Generally
speaking, Brooks would be a FIE if the "carrying value" of its "investment
property" is more than 50% of the "carrying value" of all its property,
determined in accordance with detailed rules in the draft legislation.

     If the FIE rules apply, a stockholder would generally be required to take
into account in computing income, on an annual basis, any increase or decrease
in the fair market value of a PRI Canada exchangeable share or share of Brooks
common stock, as the case may be, under a new "mark-to-market" rule, and a
stockholder would be required to recognize as ordinary income or loss, rather
than as a capital gain or capital loss, any gain or loss realized from the
disposition of a PRI Canada exchangeable share or share of Brooks common stock,
as the case may be. In certain circumstances, alternative treatment would be
available on an elective basis for a holder of shares of Brooks common stock,
but not for a holder of PRI Canada exchangeable shares.

     The draft legislation released on August 2, 2001 provides that the FIE
rules do not apply to a holder of a participating interest in a FIE where the
conditions relating to certain specific exceptions are met. In particular, the
FIE rules generally will not apply to a holder of PRI Canada exchangeable shares
or shares of Brooks common stock provided:

     - such shares are listed on a prescribed stock exchange, which currently
       includes the Toronto Stock Exchange and the Nasdaq National Market;

     - such shares are "widely held," within the meaning of the draft
       legislation;

     - such shares are "actively traded," within the meaning of the draft
       legislation; and

     - it is not reasonable to conclude that the holder had a "tax avoidance
       motive," within the meaning of the draft legislation, for the acquisition
       of such shares.

     For these purposes, a holder will be considered to have a tax avoidance
motive in acquiring shares if it is reasonable to conclude that the main reasons
for acquiring such shares include deriving a benefit attributable to income
derived from investment property, to profits or gains from the disposition of
investment property or to an increase in the value of investment property and
the deferral or reduction of tax that would have been payable by the holder had
such holder realized such income, profit or gains.

     On December 17, 2001, the Minister of Finance announced a one-year delay of
the effective date of the FIE rules such that the new rules are now proposed to
apply to taxation years beginning after 2002. The Minister indicated that this
delay will allow for full consideration of submissions that have been received
concerning the FIE rules. It is impossible to predict what changes, if any, may
be made in the draft legislation, or indeed whether the draft legislation will
be enacted in its current form or at all. Stockholders are advised to consult
their own tax advisors with respect to the potential effects, if any, to them of
the FIE rules in their own circumstances.

REGULATORY APPROVALS

  ANTITRUST CONSIDERATIONS

     Under the Hart-Scott-Rodino Antitrust Improvements Act of 1976 and the
regulations promulgated under that act, the merger may not be completed unless
required filings have been submitted to the Antitrust Division of the U.S.
Department of Justice and the U.S. Federal Trade Commission, and related waiting
period requirements have expired or are earlier terminated by the Antitrust
Division or the FTC. Effective November 13, 2001, Brooks and PRI submitted the
required filings to the Antitrust Division and the FTC. On December 13, 2001,
the Antitrust Division requested additional information from Brooks and PRI,
known as a second request. This request extends the waiting period for this
transaction until 30 days

                                        77


after the parties' substantial compliance with the request, unless the parties
and the Antitrust Division agree on a different time period. Brooks and PRI
substantially complied with the Department of Justice's request for additional
information on March 1, 2002. Brooks and PRI have now entered into a rolling
agreement with the Department whereby the parties will provide the Department
with two weeks' notice of our intention to close the merger transaction. Brooks
and PRI intend to comply with requests for information from any government
entity.

     Brooks and PRI will also make filings in other jurisdictions if filings in
those jurisdictions are required. These foreign agencies may request the parties
to provide, voluntarily or otherwise, information relevant to their review.
Brooks and PRI intend to comply with any such requests for such information.

     During or after the statutory waiting periods, and even after completion of
the merger, the Antitrust Division or the FTC could challenge or seek to block
the merger under the antitrust laws, as such agency deems necessary or desirable
in the public interest, including seeking to enjoin the consummation of the
merger or seeking the divestiture of substantial assets of Brooks or PRI. Other
foreign and state competition agencies with jurisdiction over the merger could
also initiate action to challenge or block the merger. In addition, in some
jurisdictions a competitor, customer or other third party could initiate a
private action under the antitrust laws challenging or seeking to enjoin the
merger, before or after it is completed. Brooks and PRI cannot be sure that a
challenge to the merger will not be made or that, if a challenge is made, Brooks
and PRI will prevail.

  GENERAL

     Brooks and PRI have agreed to take all reasonable actions to comply
promptly with all legal requirements that may be imposed on them in connection
with the merger and related transactions. The parties may need to obtain
consents, approvals, orders or authorizations from governmental agencies, and
may need to make filings, declarations or registrations with governmental
agencies.

     If any additional actions are required in connection with the merger or
related transactions, Brooks and PRI intend to take those actions as promptly as
possible, but may be unable to obtain all necessary consents, approvals, orders
or authorizations.

     Under the merger agreement, neither party is obligated to complete the
merger if any temporary restraining order, preliminary or permanent injunction
or other order issued by any court of competent jurisdiction or other legal or
regulatory restraint or prohibition preventing completion of the merger is in
effect.

ACCOUNTING TREATMENT

     Brooks will account for the merger using the purchase method of accounting
in accordance with Statement of Financial Accounting Standards No. 141,
"Business Combinations." As such, the assets acquired and liabilities assumed of
PRI will be recorded at their fair values as of the date of the merger. Any
excess of the purchase price over the fair value of the net tangible assets and
identifiable intangible assets acquired will be recorded as goodwill. The
results of operations of PRI will be included in Brooks' results of operations
from the date of the closing of the merger.

LISTING OF BROOKS COMMON STOCK TO BE ISSUED IN THE MERGER

     The approval for quotation on the Nasdaq National Market of the shares of
Brooks common stock to be issued in the merger is a condition to the
consummation of the merger.

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FEDERAL SECURITIES LAWS CONSEQUENCES; STOCK TRANSFER RESTRICTIONS

     The shares of Brooks common stock to be issued in connection with the
merger will be registered under the Securities Act and will be freely
transferable under the Securities Act, except that:

     - persons who are deemed to be "affiliates," as defined in the Securities
       Act, of PRI prior to the merger may only sell the shares of Brooks common
       stock they receive in the merger:

     - in transactions permitted by the resale provisions of Rule 145 under the
       Securities Act;

     - under an effective registration statement under the Securities Act
       covering the resale of such shares; or

     - under any other applicable exemption under the Securities Act; and

     - persons who become affiliates of Brooks may only sell their shares in
       transactions permitted by Rule 144 under the Securities Act, or as
       otherwise permitted under the Securities Act.

Persons who may be deemed to be affiliates include individuals or entities that
control, are controlled by, or are under common control with either Brooks or
PRI and may include some of the officers, directors, or principal stockholders
of Brooks or PRI.

     In general, under Rule 145, for one year following the effective time of
the merger, an affiliate of PRI prior to the merger will be entitled to sell
shares of Brooks common stock acquired in the merger only through unsolicited
"broker transactions" or in transactions directly with a "market maker," as such
terms are defined in Rule 144 under the Securities Act. Additionally, the number
of shares to be sold by such an affiliate (together with certain related persons
and certain persons acting in concert) within any three-month period for
purposes of Rule 145 may not exceed the greater of 1% of the outstanding shares
of Brooks common stock or the average weekly trading volume of the shares of
Brooks common stock during the four calendar weeks preceding such sale. Rule 145
will only remain available to persons who were affiliates of PRI prior to the
merger if Brooks remains current with its informational filings with the SEC.
One year after the effective time of the merger, a person who was an affiliate
of PRI prior to the merger will be able to sell shares of Brooks common stock
without regard to such manner of sale or volume limitations, provided that
Brooks is current with its informational filings and such person is not then an
affiliate of Brooks. Two years after the effective time of the merger, a person
who was an affiliate of PRI prior to the merger will be able to sell such shares
of Brooks common stock without any restrictions so long as such person had not
been an affiliate of Brooks for at least three months prior to the sale.

MANAGEMENT OF BROOKS FOLLOWING THE MERGER

     The board of directors of Brooks will be expanded at the effective time of
the merger from five to seven members, and the two new positions will be filled
by Mitchell G. Tyson, the current president and chief executive officer of PRI,
and by Kenneth M. Thompson, a current member of the PRI board of directors. See
"The Merger Agreement -- Appointment of Additional Directors to the Board of
Directors of Brooks." The current officers of Brooks will continue to serve
Brooks in their current positions. After the merger, Mitchell G. Tyson will
serve Brooks as special assistant to the chief executive officer of Brooks.

OPERATIONS FOLLOWING THE MERGER

     Following the merger, the stockholders of PRI will become stockholders of
Brooks, and their rights as stockholders will be governed by Brooks' certificate
of incorporation and bylaws and Delaware law.

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                              THE MERGER AGREEMENT

THE MERGER AGREEMENT AND RELATED DOCUMENTS

     The parties entered into the merger agreement on October 23, 2001. The
parties amended and restated the merger agreement on December 18, 2001. In this
joint proxy statement/prospectus, we often refer to the merger agreement, which
means the amended and restated merger agreement dated December 18, 2001.
Similarly, we often refer to the merger, which, unless the context otherwise
requires, refers to the merger of Pontiac Acquisition Corp., a wholly owned
subsidiary of Brooks, with and into PRI, and the immediate subsequent merger of
PRI with and into Brooks. Brooks will be the sole surviving corporation. We have
attached a copy of the merger agreement as Appendix A to this joint proxy
statement/prospectus and incorporate the merger agreement into this joint proxy
statement/prospectus by reference. Although we describe all the material terms
of the merger agreement in this section, the summary of the merger agreement we
provide below is qualified in its entirety by reference to that agreement. We
encourage you to read the merger agreement because it is the legal document that
governs the merger.

STRUCTURE OF THE MERGER

     Pontiac Acquisition Corp., a wholly owned subsidiary of Brooks, will merge
with and into PRI. As a result of the merger, Pontiac Acquisition Corp. will
cease to exist. Immediately thereafter, PRI will be merged with and into Brooks.
Brooks will be the surviving corporation in the second merger and PRI will cease
to exist.

EFFECTIVE TIME

     The merger will close at 10:00 a.m., local time, not later than the third
business day after the satisfaction or waiver of the conditions to the merger
provided for in the merger agreement (see "Conditions to the Completion of the
Merger" below), unless we agree to another time or date. The merger will become
effective after PRI and Pontiac Acquisition Corp. file articles of merger with
the Secretary of State of The Commonwealth of Massachusetts. Immediately
following that merger, PRI will be merged with and into Brooks, and Brooks will
be the sole surviving corporation.

WHAT PRI STOCKHOLDERS WILL RECEIVE IN THE MERGER

     At the effective time of the merger, each outstanding share of PRI common
stock, other than dissenting shares, will convert automatically into the right
to receive 0.52 shares of Brooks common stock. Cash will be paid in lieu of any
fractional shares of Brooks common stock. Each outstanding PRI Canada
exchangeable share will automatically become exchangeable for 0.52 shares of
Brooks common stock.

     Each outstanding share of Brooks common stock will remain outstanding and
will not be converted or changed in the merger.

TREATMENT OF PRI STOCK OPTIONS AND WARRANTS

     All PRI stock options and warrants outstanding at the effective time of the
merger will remain outstanding, and Brooks will assume all obligations with
respect to them with the following modifications:

     - following the merger, each PRI option or warrant holder will be entitled
       to purchase a number of shares of Brooks common stock that is equal to
       the number of shares of PRI common stock subject to the option or warrant
       immediately prior to the effective time, times 0.52 (rounded down to the
       nearest whole share). The exercise price per share of Brooks common stock
       subject to any such PRI option or warrant as of the effective time will
       be equal to the exercise price per share of PRI common shares subject to
       the option or warrant immediately prior to the effective time, divided by
       0.52 (rounded up to the nearest cent). For example, if a person holds an
       unexercised option to purchase 100 shares of PRI common stock for $1.00
       per share, as of the closing of the merger

                                        80


       Brooks will assume that option, and it will become an option to purchase
       52 (100 x .52) shares of Brooks common stock for $1.93 (1.00 / .52
       rounded up to the next cent) per share. The other terms of the option or
       warrant, such as the expiration date, will be unchanged;

     - Brooks will take all necessary corporate action to reserve for issuance a
       sufficient number of shares of Brooks common stock for delivery upon the
       exercise of PRI options and warrants; and

     - prior to the merger, Brooks will file one or more registration statements
       on Form S-8 with respect to the Brooks shares of common stock subject to
       the assumed PRI options, and shall use commercially reasonable efforts to
       maintain the effectiveness of any such registration statement for so long
       as the PRI options remain outstanding.

PROCEDURES FOR SURRENDER OF CERTIFICATES; FRACTIONAL SHARES

     After the completion of the merger, EquiServe Trust Company, N.A., the
exchange agent for the merger, will send a letter of transmittal to each PRI
stockholder. The letter of transmittal will contain instructions for the
surrender of PRI stock certificates.

     Upon surrender of stock certificates in accordance with the instructions in
the letter of transmittal, the surrendering PRI stockholders will be entitled to
receive stock certificates representing the shares of Brooks common stock into
which the shares of PRI common stock represented by the surrendered PRI stock
certificates were converted in the merger, together with a cash payment instead
of any fractional shares of Brooks common stock they would otherwise be entitled
to receive, as described below.

     PRI stockholders who do not surrender their PRI stock certificates will not
receive dividends payable to Brooks stockholders on any date after the effective
time of the merger. When the PRI stock certificates are finally surrendered, any
of these unpaid dividends will be paid, without interest.

     PRI's transfer books will be closed at the effective time of the merger and
no further transfers of shares of PRI stock will be recorded. If shares of PRI
stock have been transferred and the transfer was not registered in PRI's
transfer books, a certificate representing the shares of Brooks common stock
into which the transferred shares were converted in the merger will be issued to
the person to whom those shares were transferred, together with a cash payment
instead of fractional shares of Brooks common stock, if any, and any unpaid
dividends in respect of those Brooks shares, so long as the stock certificates
representing the transferred PRI shares are accompanied by all documents
required to evidence and effect the transfer and by evidence of payment of any
applicable stock transfer taxes.

     If your PRI stock certificates have been lost, stolen or destroyed, you
will be entitled to receive the merger consideration only by making an affidavit
and, if required by Brooks, by posting a bond in an amount sufficient to protect
Brooks against claims related to your PRI stock certificate. PRI stockholders
are urged to notify EquiServe immediately if their PRI stock certificates have
been lost, stolen, destroyed or are not properly registered, in order to begin
the process of obtaining replacement PRI stock certificates. EquiServe can be
reached at 150 Royall Street, Canton, Massachusetts 02021, telephone (781)
575-2000.

     Brooks will not issue fractional shares of Brooks common stock. Instead,
the exchange agent will pay an amount in cash determined by multiplying the
applicable fractional share interest by the closing sale price for the shares of
Brooks common stock on the Nasdaq National Market on the day of the completion
of the merger. Taxes will be withheld if required.

     None of Brooks, Pontiac Acquisition Corp., PRI and the exchange agent will
be liable to any PRI stockholder for any undistributed shares of Brooks common
stock or cash amounts that are delivered to a public official under applicable
abandoned property or similar laws.

APPOINTMENT OF ADDITIONAL DIRECTORS TO THE BOARD OF DIRECTORS OF BROOKS

     The board of directors of Brooks fixes, from time to time, the number of
directors authorized by Brooks' bylaws. The size of the board is currently fixed
at five, and five persons have been nominated by the board to serve as
directors. Please see "Brooks Proposal No. 3 -- Election of Brooks Directors"
for a

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discussion of the election of these nominees. If this Proposal No. 1 is approved
and the merger is completed, Brooks has agreed to fix the number of directors at
seven, and to appoint two additional directors to serve until the Brooks 2003
annual meeting of stockholders and until their respective successors have been
duly elected and qualified. The board of directors of Brooks intends to appoint
the persons listed below, each of whom currently serves as a director of PRI, as
additional directors if Proposal No. 1 is approved.



                                                                                    PRI
NAME                            AGE                  POSITION                  DIRECTOR SINCE
----                            ---                  --------                  --------------
                                                                      
Mitchell G. Tyson.............   47   Director, President and Chief                 1995
                                      Executive Officer, PRI
Kenneth M. Thompson...........   63   Director, PRI                                 1998


     Mitchell G. Tyson was named chief executive officer of PRI in August 1998.
He was elected to the office of president and named a director of PRI in 1995.
Mr. Tyson served as PRI's chief operating officer from 1990 to 1998. From 1987
to 1990, he served as vice president, operations of PRI. From 1984 to 1987, Mr.
Tyson was the director of product management of GCA Corporation, a manufacturer
of semiconductor capital equipment. From 1979 to 1984, he was a senior
legislative assistant and science advisor to U.S. Senator Paul Tsongas in
Washington, D.C. Mr. Tyson holds a B.S. in physics, an M.S. in political science
and an M.S. in nuclear engineering, all from the Massachusetts Institute of
Technology. Mr. Tyson is a member of the board of directors of the International
Sematech Industry Executive Forum and the North American Advisory Board of SEMI,
a trade association that represents the worldwide semiconductor equipment
industry. Mr. Tyson is also a member of the board of directors and treasurer of
the Massachusetts High Technology Council.

     Kenneth M. Thompson became a director of PRI in July 1998. Mr. Thompson is
president, chief executive officer and a director of AvantCom Network, Inc., a
supplier of Internet-based diagnostics software. He was employed by Intel
Corporation for twenty-five years, most recently as vice president, technology
manufacturing engineering. He retired from Intel in 1998. Mr. Thompson is a
director of Lam Research Corporation, a semiconductor equipment supplier. Lam is
a significant customer of Brooks. See "Certain Relationships and Related
Transactions of Brooks."

NAME OF BROOKS AFTER THE MERGER

     At or immediately after the merger, Brooks plans to change its name to
"Brooks-PRI Automation, Inc." or as otherwise agreed to between Brooks and PRI
prior to the merger.

REPRESENTATIONS AND WARRANTIES

     In the merger agreement, Brooks and PRI made various representations and
warranties to each other. The representations made relate to, among other
things:

     - corporate organization, qualification, standing and power;

     - subsidiaries;

     - capitalization;

     - authorization and enforceability of the merger documents, required
       consents and approvals (including board, stockholder and governmental) to
       complete the merger, and whether entering into the merger will violate
       existing agreements;

     - compliance with applicable laws, and requirements regarding permits and
       licenses;

     - documents filed with the SEC;

     - title to properties;

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     - preparation of the registration statement and compliance with securities
       laws;

     - absence of material changes or events since June 30, 2001 (since July 1,
       2001 for PRI), other than changes relating to various excluded factors;

     - tax matters;

     - contracts;

     - litigation and disclosure of liabilities;

     - employee benefit matters;

     - intellectual property matters;

     - environmental matters;

     - labor matters;

     - engagement of and payment of fees to brokers, investment bankers, finders
       or financial advisors in connection with the merger agreement;

     - opinion of financial advisor;

     - the inapplicability of state business combination laws to the merger
       agreement or the consummation of the merger;

     - amendments to stockholder rights agreements; and

     - the execution of voting agreements by the directors and certain officers
       of each party and the delivery of such agreements to the other party.

     Additional representations regarding Pontiac Acquisition Corp. made by
Brooks to PRI relate to, among other things:

     - capitalization;

     - corporate organization, qualification, standing and power; and

     - authorization and enforceability of the merger documents.

     The merger agreement provides that these representations and warranties
will not survive, or continue in effect, after the closing of the merger.

COVENANTS

  CONDUCT OF BUSINESS

     During the period from the date of the merger agreement to the effective
time of the merger, each of Brooks and PRI must comply with agreements relating
to the conduct of their respective businesses. Except as permitted or
contemplated by the merger agreement or as consented to by the other party, each
of Brooks and PRI have agreed that until the completion of the merger it will
each:

     - conduct its business in all material respects in the ordinary course
       consistent with past practice;

     - use reasonable efforts to preserve its business organization;

     - use reasonable efforts to keep available the services of its officers and
       other employees;

     - use reasonable efforts to maintain its existing relations and goodwill
       with customers, suppliers, regulators, distributors, creditors, lessors
       and others having business dealings with it;

     - promptly advise the other party orally and in writing if it has knowledge
       that any of its representations or warranties in the merger agreement has
       become untrue or inaccurate, or that it or any of its subsidiaries has
       failed to comply with or satisfy any of its covenants in the merger
       agreement; and

                                        83


     - promptly advise the other party orally and in writing if it has knowledge
       of any material adverse effect or any change or event that could
       reasonably be expected to have a material adverse effect on the truth of
       its representations and warranties or its ability to satisfy any
       condition to the merger.

     Except as otherwise permitted by the merger agreement or as consented to by
the other party, the merger agreement prohibits each of Brooks and PRI from
taking specific action prior to completion of the merger, including:

     - declaring or paying dividends;

     - splitting, combining, subdividing or reclassifying its outstanding
       shares;

     - repurchasing its shares;

     - issuing shares of common stock, or options to purchase shares of its
       common stock, or securities convertible into shares of its common stock,
       with specified permitted exceptions;

     - amending its organizational documents;

     - purchasing any other business or entity that:

        - for PRI, would involve aggregate consideration in excess of $5 million
          or would not be reasonably expected to be accretive to PRI's earnings
          within 12 months following consummation; or

        - for Brooks, would involve aggregate consideration in excess of $200
          million or would require the approval of the Brooks stockholders.

     - taking any action that could reasonably be expected to result in any of
       its representations and warranties set forth in the merger agreement
       becoming untrue or inaccurate in any material respect, or any of the
       conditions to the merger not being satisfied.

     Additionally, the merger agreement also prohibits PRI, except as otherwise
permitted by the merger agreement or as consented to by Brooks, from taking
specific actions, including:

     - leasing, encumbering or otherwise disposing of its assets, except in the
       ordinary course of business or pursuant to specified permitted
       exceptions;

     - making any expenditure of cash in excess of $8 million in the aggregate;

     - incurring, assuming, or guaranteeing indebtedness for money borrowed in
       excess of $5 million on or before January 31, 2002, or in excess of $20
       million after January 31, 2002, other than letters of credit issued for
       the benefit of customers of PRI in the ordinary course of business;

     - accelerating, amending or changing the period of exercisability of
       options or restricted stock granted under any PRI stock plan or
       authorizing cash payments in exchange for any options granted under any
       such plan;

     - increasing the compensation payable to any of its officers, directors or
       employees except in the ordinary course of the business;

     - granting any severance or termination pay to any of its directors or
       officers, except in connection with reductions in force or terminations
       of individual employees in the normal course of business;

     - entering into any collective bargaining agreement (other than as required
       by law), or establishing, adopting, entering into or amending any
       employee benefit plan for the benefit of any directors, officers or
       employees;

     - settling or compromising any pending or threatened suit, action or claim,
       other than settlements of matters for less than or equal to $3 million,
       individually or in the aggregate;

     - except in the ordinary course of business consistent with past practice,
       modifying or amending in any material respect any material contract;

                                        84


     - changing in any material respect its accounting methods, principles or
       practices, other than as required by generally accepted accounting
       principles or by the Securities and Exchange Commission; and

     - authorizing, or committing, or agreeing to take, any of the foregoing
       actions.

     The foregoing limitations do not apply to any transaction between PRI and a
wholly owned subsidiary of PRI or between any wholly owned subsidiaries of PRI.

  NO SOLICITATION

     PRI may not, and may not permit its subsidiaries to, authorize or permit
any of its officers, directors, employees, accountants, counsel, investment
bankers, financial advisors or representatives to:

     - solicit, initiate or encourage (including by way of furnishing
       information), or take any other action to knowingly facilitate any
       takeover proposal; or

     - participate in any discussions or negotiations regarding any takeover
       proposal or provide any confidential information to any person relating
       to any takeover proposal, with specified exceptions (described directly
       below).

     However, prior to obtaining stockholder approval of the merger, in response
to an unsolicited takeover proposal that the PRI board determines in good faith
(after consultation with outside counsel and a financial advisor of nationally
recognized reputation) is reasonably likely to lead to a superior proposal, PRI
may:

     - furnish confidential information to the person making the takeover
       proposal to PRI if that person signs a customary confidentiality
       agreement not less restrictive on such person than the confidentiality
       agreement PRI signed with Brooks; and

     - participate in discussions and negotiations regarding the takeover
       proposal.

     In the merger agreement, "takeover proposal" is defined to mean any
inquiry, proposal, indication of interest or offer from any person relating to
any:

     - acquisition or purchase of a business or assets that constitutes 15% of
       the net revenues, net income or assets of PRI and its subsidiaries, taken
       as a whole;

     - tender offer or exchange offer that if completed would result in a person
       beneficially owning 15% or more of any class of equity securities of PRI;
       or

     - merger or other business combination or transaction involving PRI or
       PRI's common stock, or any of PRI's subsidiaries whose business
       constitutes 30% or more of the net revenues, net income or assets of PRI
       and its subsidiaries, taken as a whole.

     In the merger agreement, "superior proposal" is defined as any takeover
proposal by a third party, if:

     - the proposal is for all of the capital stock of PRI or not less than 90%
       of the assets (except to the extent not more than 30% of the assets is
       reasonably anticipated to be required to be disposed of by a regulatory
       body); and

     - the proposal is otherwise on terms that the PRI board of directors
       determines, in its good faith judgment based in part on the advice of a
       financial advisor of nationally recognized reputation, to be more
       favorable to PRI's stockholders than the proposed merger with Brooks and
       for which the third party has obtained committed financing, to the extent
       required, or in the good faith judgment of the PRI board, the third party
       is reasonably capable of obtaining and completing such financing.

     In addition, PRI must advise Brooks orally and in writing of any takeover
proposal or superior proposal or any inquiry that could reasonably be expected
to lead to any takeover proposal or superior proposal, and the material terms of
any such takeover proposal or superior proposal. PRI must also keep Brooks
reasonably informed of any material changes to any such takeover proposal or
superior proposal.

                                        85


     Except in the circumstances we describe below, the PRI board of directors
may not:

     - withdraw or modify, or propose to withdraw or modify, in a manner adverse
       to Brooks, its approval of the merger or the merger agreement;

     - approve any letter of intent, memorandum of intent, agreement in
       principle, acquisition agreement or similar agreement relating to any
       takeover proposal or superior proposal; or

     - approve or recommend, or propose publicly to approve or recommend, any
       takeover proposal or superior proposal.

     In response to a superior proposal from a third party that PRI did not
solicit in violation of the merger agreement, the PRI board of directors may,
prior to stockholder approval of the merger with Brooks, approve or recommend
that PRI enter into an agreement with the third party with respect to its
superior proposal if the PRI board of directors determines in good faith, after
consultation with outside counsel, that the failure to do so is reasonably
likely to constitute a breach of fiduciary duty to PRI stockholders. However,
the PRI board must first give written notice advising Brooks that it has
resolved to recommend a superior proposal, specifying its material terms and
identifying the person making the superior proposal, and then must wait five
business days after giving the notice.

     Within five business days of receipt of the written notice, Brooks will
have the opportunity to present the PRI board with proposed revised terms of the
merger. The PRI board will consider in good faith any such revised terms and
take them into account before determining to approve or recommend the third
party's proposal. PRI also agrees to negotiate with Brooks with respect to the
terms and conditions of the Brooks counterproposal for a reasonable period of
time, and to accept the Brooks counterproposal if the terms and conditions of
the Brooks counterproposal are no less favorable than the terms and conditions
of the third party's proposal.

     If, after determining that any revised proposal of Brooks is less favorable
than the terms of the superior proposal, the PRI board elects to recommend the
approval or adoption of a superior proposal, PRI must still use its best efforts
to hold a stockholders meeting to vote on the proposed merger with Brooks.
However, if the PRI board makes this recommendation and, as a result, Brooks
terminates the merger agreement, PRI must pay Brooks the $14.0 million
termination fee plus expenses, which are discussed below under "The Merger
Agreement -- Fees and Expenses."

FEES AND EXPENSES

     Whether or not the merger is completed, Brooks and PRI will each pay its
own costs and expenses incurred in connection with the merger agreement. Brooks
and PRI will, however, split equally the fees and expenses incurred in
connection with the filing, printing and mailing of the registration statement
and this joint proxy statement/prospectus, including SEC filing fees.

     Brooks and PRI have agreed that PRI will pay Brooks a $14.0 million
termination fee plus the reasonable out-of-pocket expenses of Brooks incurred
since October 1, 2001, in connection with this transaction if:

     - all three of the following occur: (i) any third party makes a takeover
       proposal to PRI or its stockholders; (ii) either party subsequently
       terminates the merger agreement because PRI's stockholders fail to
       approve the merger; and (iii) within 12 months after the termination of
       the merger agreement, PRI enters into or completes an acquisition
       transaction with the third party associated with the takeover proposal;

     - all three of the following occur: (i) any third party makes a takeover
       proposal to PRI or its stockholders; (ii) Brooks subsequently terminates
       the merger agreement because PRI has breached or failed to perform in any
       material respect any of its covenants or other agreements in the merger
       agreement (and such breach or failure is not cured with 45 days of
       written notice from Brooks); and (iii) within 12 months after the
       termination of the merger agreement, PRI enters into or completes another
       acquisition transaction with the third party associated with the takeover
       proposal;

                                        86


     - all three of the following occur: (i) PRI materially breaches its
       non-solicitation covenant; (ii) the breach is not cured within 24 hours
       after certain PRI executive employees learn of the breach; and (iii)
       Brooks subsequently terminates the merger agreement because of such
       breach; or

     - Brooks terminates the agreement because any of the following occur: (i)
       PRI, the PRI board of directors or a committee thereof has recommended to
       the PRI stockholders a takeover proposal by a third party, (ii) PRI, the
       PRI board of directors or a committee thereof withdraws, or amends or
       modifies in a manner adverse to Brooks, its recommendation to the PRI
       stockholders of the merger agreement or the merger, (iii) PRI fails to
       include its recommendation of the merger agreement and the merger in the
       joint proxy statement/prospectus or registration statement, or (iv) a
       tender or exchange offer relating to 15% or more of the shares of PRI
       common stock is commenced by a third party, and PRI does not publish,
       send or give its stockholders, within ten business days after such tender
       or exchange offer is first published, a statement recommending the
       rejection of the tender offer or exchange offer.

ADDITIONAL AGREEMENTS

  PREPARATION OF REGISTRATION STATEMENT AND JOINT PROXY STATEMENT/PROSPECTUS;
STOCKHOLDER MEETINGS

     - Brooks and PRI have agreed to jointly prepare and file with the SEC a
       registration statement under the Securities Act (of which this joint
       proxy statement/prospectus is a part) for the purpose of soliciting
       proxies from Brooks stockholders and from PRI stockholders in favor of
       the approval of the merger;

     - Brooks and PRI have agreed to mail this joint proxy statement/prospectus
       to their respective stockholders as promptly as practicable after the
       registration statement has been declared effective by the SEC;

     - Brooks and PRI have each agreed to call and convene a stockholders
       meeting, as promptly as practicable after the registration statement is
       declared effective. Both parties agreed to use their best efforts to have
       their stockholders meetings on the same day; and

     - Brooks has agreed to submit a proposal to its stockholders at its
       stockholders meeting to change the name of the company to "Brooks-PRI
       Automation, Inc.," and agreed to use its best efforts to solicit proxies
       from the Brooks stockholders in favor of such name change.

  ACCESS TO INFORMATION; CONFIDENTIALITY

     Brooks and PRI have agreed to permit representatives of the other party to
have reasonable access to all their properties, books, contracts, commitments,
personnel and records, and to keep confidential any information or documents
obtained from the other party, except as provided in the merger agreement.

  BEST EFFORTS

     Each of Brooks and PRI has agreed to use best efforts to take all actions
necessary or advisable under applicable law to complete the merger as soon as
practicable, including but not limited to:

     - preparing and filing all necessary applications, notices and filings with
       governmental entities in order to obtain any necessary approvals or
       waivers; and

     - obtaining all consents, approvals or waivers from governmental
       authorities and certain third parties.

  TAKEOVER STATUTES

     If any "fair price," "moratorium," "control share acquisition" or other
similar antitakeover statute or regulation is or may become applicable to the
merger and the other transactions contemplated by the merger agreement and the
voting agreements, Brooks and PRI have agreed that their respective boards of

                                        87


directors will grant any approvals and take all actions legally permissible so
that these transactions may be promptly consummated on the terms contemplated by
such agreement.

  INDEMNIFICATION, EXCULPATION AND INSURANCE

     - Brooks has agreed to maintain the rights to indemnification, exculpation
       from liabilities and reimbursement of expenses for acts or omissions
       occurring at or prior to the merger now existing in favor of the current
       or former directors or officers of PRI and its subsidiaries.

     - Brooks has agreed that persons who become directors or officers of Brooks
       pursuant to the merger agreement or the merger will be entitled to the
       same indemnity, exculpation and reimbursement of expenses as those
       afforded to the directors and officers of Brooks immediately before the
       merger.

  PUBLIC ANNOUNCEMENTS

     Brooks and PRI have agreed to consult with one another and use their
reasonable efforts to agree upon the text of any press release or public
statement relating to the merger or required by any governmental entity or
regulatory body.

  NASDAQ NATIONAL MARKET LISTING OF BROOKS COMMON STOCK

     Brooks has agreed to prepare and submit to the Nasdaq National Market a
listing application with respect to the shares of Brooks common stock to be
issued in connection with the merger and to use best efforts to obtain approval
for the listing of those shares of Brooks common stock on the Nasdaq National
Market.

  TAX TREATMENT

     Brooks and PRI have agreed to use best efforts to cause the mergers to
qualify as a reorganization under Section 368 of the Internal Revenue Code and
have agreed to use best efforts to avoid taking any action that would cause the
mergers to fail to qualify as a reorganization.

  BENEFIT PLANS

     Brooks has agreed:

     - to take all reasonable steps so that employees of PRI and its
       subsidiaries will be entitled to participate in each Brooks employee
       benefit plan to the same extent as similarly situated employees of Brooks
       and its subsidiaries;

     - that for purposes of determining eligibility and vesting, Brooks will
       take into account the services of PRI employees to the same extent as
       such services were credited for such purposes by PRI; and

     - to honor all benefit obligations of, and contractual rights of, current
       and former employees of PRI existing as of the merger, as well as all
       employment or severance agreements, plans or policies of PRI.

     If employees of PRI or its subsidiaries become eligible to participate in a
medical, dental or vision plan of Brooks, Brooks agrees to cause such plan to:

     - waive any preexisting condition limitations to the extent such conditions
       are covered under the applicable medical, dental or vision benefits plans
       of Brooks;

     - honor under such plans any deductible, co-payment and out-of-pocket
       expenses incurred by the employees and their beneficiaries during the
       portion of the calendar year prior to such participation; and

     - waive any waiting period limitation or evidence of insurability
       requirement that would otherwise be applicable to such employee on or
       after the merger to the extent such employee had satisfied any

                                        88


similar limitation or requirement under a similar employee benefit plan
sponsored by PRI or its subsidiaries prior to the merger.

CONDITIONS TO THE COMPLETION OF THE MERGER

     The obligations of Brooks and PRI to complete the merger are subject to the
satisfaction or waiver of various conditions on or before the date on which the
merger is completed, and include, in addition to other customary closing
conditions, the following:

     - PRI stockholders shall have approved the merger and adoption of the
       merger agreement;

     - Brooks stockholders shall have approved the merger and adoption of the
       merger agreement;

     - the waiting period under the Hart-Scott-Rodino Act shall have expired or
       been terminated;

     - governmental and regulatory authorities shall have issued all other
       approvals necessary to complete the transactions without conditions that
       would be materially adverse to Brooks' or PRI's businesses, financial
       condition or results of operations, unless the failure to obtain the
       approvals would not reasonably be expected to have a material adverse
       effect on the business, financial condition or the results of operations
       of Brooks or PRI;

     - no court shall have issued an order and no law shall have been enacted
       that prevents the completion of the merger or makes the completion of the
       merger illegal;

     - the registration statement on Form S-4 registering the shares of Brooks
       common stock to be issued in the merger shall have become effective, and
       no stop order suspending the effectiveness of the registration statement
       shall be in effect or initiated, and to the parties' knowledge, all
       necessary approvals or permits under state securities or "blue sky" laws
       shall have been obtained;

     - the shares of Brooks common stock issuable in connection with the merger
       shall have been approved for listing on the Nasdaq National Market,
       subject to official notice of issuance;

     - the Toronto Stock Exchange shall have confirmed the continued listing of
       the PRI Canada exchangeable shares and any necessary regulatory approvals
       shall have been obtained;

     - Brooks shall have filed a registration statement on Form S-3 to register
       the issuance of shares of Brooks common stock to the holders of the PRI
       Canada exchangeable shares upon the exchange of such exchangeable shares
       for Brooks common stock, and such Form S-3 shall be effective, and no
       stop order suspending the effectiveness shall be in effect or initiated;

     - Brooks and PRI each shall have received an opinion from their respective
       tax counsel to the effect that the merger will constitute a
       "reorganization" within the meaning of Section 368 of the Internal
       Revenue Code;

     - the representations and warranties made by the other party in the merger
       agreement shall be true and correct, except to the extent that the
       failure to be true and correct shall not have, and shall not be likely to
       have, a material adverse effect on the other party;

     - the other party shall have performed in all material respects all
       obligations required to be performed by it under the merger agreement on
       or before the date of the completion of the merger; and

     - there shall not have been any material adverse change relating to the
       other party.

     Neither Brooks nor PRI may rely on the failure of any of the foregoing
conditions if such failure was caused by such party's failure to use best
efforts to consummate the merger and the other transactions contemplated by the
merger agreement.

     If the law permits, any condition to the merger may be waived. The law does
not permit Brooks or PRI to waive conditions relating to stockholder approval,
injunctions, court orders or the receipt of clearance under the
Hart-Scott-Rodino Antitrust Improvements Act or from any necessary foreign
competition authorities.
                                        89


TERMINATION OF THE MERGER AGREEMENT

     The merger agreement may be terminated by mutual written consent of Brooks
and PRI. It may also be terminated:

     - by either Brooks or PRI, if the merger is not completed on or before July
       31, 2002. However, neither party may terminate the merger agreement if
       such party's failure to fulfill any of its obligations under the merger
       agreement is the cause of the merger not being completed by this date.
       Also, either party may extend the merger agreement by not more than 30
       days if the merger is not completed as a direct result of either party's
       failure to receive all regulatory approvals required with respect to the
       merger;

     - by either Brooks or PRI, if PRI stockholders fail to approve and adopt
       the merger agreement;

     - by either Brooks or PRI, if Brooks stockholders fail to approve and adopt
       the merger agreement;

     - by either Brooks or PRI, if a court or governmental entity issues a
       final, non-appealable order that makes the merger illegal or permanently
       prohibits the completion of the merger, but only if the party seeking to
       terminate the merger agreement has used best efforts to have the court
       order vacated;

     - by either Brooks or PRI, if (i) there has been a material breach by the
       other party of its representations, warranties, covenants or agreements
       contained in the merger agreement, (ii) the breach would result in the
       failure to satisfy one or more of the conditions to the merger, and (iii)
       the breach is incapable of being cured or, if capable of being cured, has
       not been cured within 45 days after written notice was received by the
       party alleged to be in breach;

     - by Brooks, if (i) PRI, the PRI board of directors or any committee
       thereof recommends to the PRI stockholders a takeover proposal by a third
       party; (ii) PRI, the PRI board of directors or any committee thereof
       withdraws or adversely amends or modifies its recommendation that the PRI
       stockholders vote in favor of approval and adoption of the merger
       agreement; (iii) PRI shall have failed to include its recommendation of
       the merger agreement and the merger in the joint proxy
       statement/prospectus or registration statement; or (iv) a tender or
       exchange offer relating to 15% or more of the shares of PRI common stock
       is commenced by a third party, and PRI does not publish, send or give its
       stockholders, within ten business days after such tender or exchange
       offer is first published, a statement recommending the rejection of the
       tender offer or exchange offer; or

     - by PRI, if (i) Brooks, the Brooks board of directors or any committee
       thereof shall have amended or modified in a manner adverse to PRI its
       recommendation of the merger agreement and the merger, or (ii) Brooks
       shall have failed to include its recommendation of the merger agreement
       and the merger in the joint proxy statement/prospectus or registration
       statement.

AMENDMENTS

     Brooks and PRI may amend the merger agreement at any time before or after
receiving approval of the Brooks or PRI stockholders of the matters contemplated
by the merger agreement. After receiving these approvals, Brooks and PRI may not
make any amendment that, by law or in accordance with the rules of any relevant
stock exchange, requires further approval by the Brooks stockholders or the PRI
stockholders without first obtaining such additional approval. Brooks and PRI
plan to provide their stockholders with a supplement to joint proxy
statement/prospectus that describes any amendment to the merger agreement that
is made prior to the stockholder meetings and that is material to an investment
decision regarding Brooks common stock.

WAIVER AND EXTENSION

     Either party may waive any obligation of the other party under the merger
agreement or give the other party additional time to comply with the obligation.
Any waiver or extension must be in writing and must be signed by the party
giving the waiver or extension. Brooks and PRI plan to provide their
stockholders with a supplement to the joint proxy statement/prospectus that
describes any waiver to the merger agreement that is made prior to the
stockholder meetings and that is material to an investment decision regarding
Brooks common stock.

                                        90


                               RELATED AGREEMENTS

VOTING AGREEMENTS

     The following summary of the voting agreements is qualified by reference to
the complete text of the voting agreements, the forms of which are attached as
Appendixes C and D to this joint proxy statement/prospectus. You are encouraged
to read the forms of voting agreements in their entirety.

  BROOKS VOTING AGREEMENTS

     As an inducement to PRI to enter into the merger agreement, on October 23,
2001, the directors and executive officers of Brooks listed below entered into
voting agreements with PRI under which they agreed, among other things, to vote
all of the shares of Brooks common stock owned or acquired by them upon the
exercise of any options or otherwise (i) in favor of the merger agreement and
the merger, and (ii) against other corporate actions the consummation of which
would frustrate the purposes, or prevent or delay the consummation, of the
transactions contemplated by the merger agreement. Each person also agreed
generally not to grant any proxies or transfer their shares of Brooks common
stock during the term of the voting agreement, except that they may assign or
transfer shares for estate planning or charitable purposes if the recipient of
the shares agrees to be bound by the voting agreement. These directors and
executive officers of Brooks did not receive any additional consideration for
signing these voting agreements.



                                                              SHARES OF BROOKS
STOCKHOLDER                                                     COMMON STOCK
-----------                                                   ----------------
                                                           
Robert J. Therrien and distributees(1)......................     1,017,167
Michael W. Pippins..........................................        41,013
Roger D. Emerick............................................         9,000
Ellen B. Richstone..........................................         8,753
Lynda M. Avallone...........................................         7,158
Steven E. Hebert............................................         3,070
Charles M. McKenna..........................................           754
Jeffrey A. Cassis...........................................           242
Amin J. Khoury..............................................            --
Juergen Giessmann...........................................            --
Joseph R. Martin............................................            --
                                                                 ---------
     Total..................................................     1,087,157


---------------

(1) Includes certain shares subsequently gifted by Mr. Therrien that continue to
    be subject to the terms of the voting agreements.

     As part of the voting agreements, each person listed above granted an
irrevocable proxy to PRI to vote the shares of Brooks common stock owned or
acquired by them in accordance with their voting agreements. As of March 31,
2002, the directors and executive officers of Brooks listed above owned a total
of 1,087,157 shares of Brooks common stock, representing approximately 5.4% of
the shares of Brooks common stock outstanding on that date. The voting
agreements and proxies expire on the earlier of the effective time of the merger
or the termination of the merger agreement in accordance with its terms.

     Brooks is party to a stockholder agreement with Robert J. Therrien, M+W
Zander Holding GmbH and Jenoptik AG under which M+W agreed to vote all its
shares of Brooks common stock on all matters in accordance with the
recommendation of a majority of the Brooks board of directors. Giving effect to
this stockholder agreement and the voting agreements, as of March 31, 2002,
holders of an aggregate total of approximately 9.3% of Brooks common stock have
agreed to vote in favor of the merger. See "Certain Relationships and Related
Transactions of Brooks--Jenoptik Stockholder Agreement."

                                        91


  PRI VOTING AGREEMENTS

     As an inducement to Brooks to enter into the merger agreement, on October
23, 2001, certain directors and executive officers of PRI listed below entered
into voting agreements with Brooks under which they agreed, among other things,
to vote all of the shares of PRI common stock owned or acquired by them upon the
exercise of any options or otherwise (i) in favor of the merger agreement and
the merger, and (ii) against any other acquisition proposal. Each person also
agreed generally not to grant any proxies or transfer their shares of PRI common
stock during the term of the voting agreement, except that they may assign or
transfer shares for estate planning or charitable purposes if the recipient of
the shares agrees to be bound by the voting agreement. Mordechai Weisler's
voting agreement also permits him to transfer up to 75,000 shares to a
charitable organization recognized by the Internal Revenue Service without
obtaining a voting agreement from that organization. These directors and
executive officers of PRI did not receive any additional consideration for
signing these voting agreements.



                                                              SHARES OF PRI
STOCKHOLDER                                                   COMMON STOCK
-----------                                                   -------------
                                                           
Mordechai Wiesler...........................................      468,777
Amram Rasiel................................................      476,210
Mitchell G. Tyson...........................................      177,042
Alexander V. d'Arbeloff.....................................       64,767
Boruch B. Frusztajer........................................       30,000
Cosmo S. Trapani and distributees(1)........................       15,810
Kenneth M. Thompson.........................................           --
                                                                ---------
     Total..................................................    1,232,606


---------------

(1) Includes certain shares subsequently gifted by Mr. Trapani that continue to
    be subject to the terms of the voting agreements.

     As part of the voting agreements, each person listed above granted an
irrevocable proxy to Brooks to vote the shares of PRI common stock owned by them
in accordance with the voting agreements. As of March 31, 2002, the directors
and executive officers of PRI listed above owned a total of 1,232,606 shares of
PRI common stock, representing approximately 4.7% of the shares of PRI common
stock outstanding on that date. The voting agreements and proxies expire on the
earlier of the effective time of the merger or the termination of the merger
agreement in accordance with its terms.

EMPLOYMENT AGREEMENT WITH MITCHELL G. TYSON

     Simultaneously with the execution of the merger agreement, Mitchell G.
Tyson, PRI's president and chief executive officer, signed an employment
agreement with Brooks and PRI. See "Background of the Merger." The agreement
will become effective upon the closing of the merger and will replace his
existing employment agreement with PRI. Following the merger, Brooks will employ
Mr. Tyson as special assistant to the chief executive officer of Brooks. The
employment agreement has a term of six months commencing on the closing of the
merger.

     Under the employment agreement, Brooks will pay Mr. Tyson a base salary of
$182,000 for the six month term. In addition, Brooks will pay Mr. Tyson a
retention bonus of $364,000 if he remains employed by Brooks through the full
term of the employment agreement or if the employment agreement is terminated
due to Mr. Tyson's death or disability. The agreement also provides that Mr.
Tyson is entitled to receive the benefits that Brooks generally provides to
other employees of similar status and compensation.

     The agreement provides that, for a period of two years after the date on
which his employment is terminated for any reason, Mr. Tyson will not compete
with Brooks, directly or indirectly, whether as an employee, owner, partner,
shareholder, investor, or otherwise. During this same period, Mr. Tyson agrees
that he will not knowingly interfere with any of Brooks' business relationships
and will assist Brooks in enforcing its ownership of and rights to certain
intellectual property. In consideration for Mr. Tyson's agreement to these
provisions, during the two years after the date on which his employment is
terminated,

                                        92


Brooks will pay Mr. Tyson $546,000 each year, and he will be eligible to
participate in all insurance and other benefit programs for employees of Brooks
on the same basis as other employees of similar status and compensation.

     The agreement also provides that, upon the closing of the merger, the
vesting of all options previously granted by PRI to Mr. Tyson will accelerate so
that they will be exercisable in full (fair market value using the Black-Scholes
option pricing model of approximately $4.5 million as of December 31, 2001,
including $680,000 attributable to the option granted to him on October 8,
2001), and all such options will be exercisable until the earlier of the
original expiration date of the option or three years after the closing.

     If any payment or benefit received by Mr. Tyson becomes subject to any
excise tax imposed by Section 4999 of the Internal Revenue Code, Brooks will pay
Mr. Tyson an amount equal to that excise tax.

     The agreement provides that Mr. Tyson's employment will terminate or may be
terminated as follows:

     - upon Mr. Tyson's death;

     - by Brooks, if the board of directors of Brooks determines in good faith
       that Mr. Tyson suffers a disability, which is physical or mental illness
       that prevents him from performing his duties as a full-time employee of
       Brooks and, at least 26 weeks after its commencement, such inability is
       determined to be total and permanent by a physician selected by Brooks
       and acceptable to Mr. Tyson;

     - by Brooks for cause; and

     - voluntarily by Mr. Tyson, at any time upon 30 days' written notice to
       Brooks.

     The agreement also provides that Mr. Tyson will maintain in confidence any
proprietary or confidential information, trade secrets or know-how belonging to
Brooks.

     Under the agreement, Brooks will indemnify Mr. Tyson to the fullest extent
permitted by law and Brooks' certificate of incorporation and bylaws against all
liabilities and costs resulting from any claim that relates to Mr. Tyson's
performance of his duties under the agreement.

     Mr. Tyson's employment agreement supersedes his retention agreement with
PRI, and he is not entitled to any of the severance payments or benefits set
forth in his retention agreement.

                                        93


              COMPARATIVE PER SHARE MARKET PRICE AND DIVIDEND DATA

     The Brooks common stock has traded on the Nasdaq National Market under the
symbol "BRKS" since 1995. The PRI common stock has traded on the Nasdaq National
Market under the symbol "PRIA" since 1994. The following table provides the high
and low closing sales prices reported on the Nasdaq National Market for the
Brooks common stock and the PRI common stock for the periods indicated. The
prices shown do not include retail markups, markdowns or commissions.



                                            BROOKS COMMON STOCK      PRI COMMON STOCK
                                            --------------------    ------------------
                                             HIGH          LOW       HIGH        LOW
                                            -------      -------    -------    -------
                                                                   
Fiscal year ended September 30, 2000
  First quarter...........................  $ 34.25      $ 16.69    $ 67.13    $ 34.00
  Second quarter..........................  $ 83.25      $ 29.75      87.63      59.06
  Third quarter...........................  $ 91.88      $ 37.00      79.88      45.06
  Fourth quarter..........................  $ 69.38      $ 29.63      71.44      18.25
Fiscal year ended September 30, 2001
  First quarter...........................  $ 31.25      $ 20.25    $ 25.94    $ 14.63
  Second quarter..........................  $ 44.39      $ 27.56      32.50      16.50
  Third quarter...........................  $ 62.61      $ 35.45      21.20      13.75
  Fourth quarter..........................  $ 52.25      $ 26.59      18.42      10.02
Fiscal year ending September 30, 2002
  First quarter...........................  $ 43.24      $ 25.22    $ 22.04    $  9.09
  Second quarter..........................  $ 51.21      $ 41.72    $ 26.32    $ 21.14
  Third quarter (through April 8, 2002)...  $ 44.70      $ 37.40    $ 23.10    $ 19.39


     As of March 31, 2002, there were approximately 348 record holders of Brooks
common stock, and approximately 355 record holders of PRI common stock. Other
than dividends paid by one of Brooks' subsidiaries prior to Brooks' acquisition
of that subsidiary, neither Brooks nor PRI has ever paid cash dividends on its
common stock. Brooks and PRI intend to retain any earnings to support the
development of their respective businesses, and neither anticipates paying cash
dividends in the foreseeable future. Following completion of the merger, the
Brooks common stock will continue to be listed on the Nasdaq National Market,
and there will be no further market for the PRI common stock.

     The following table provides the closing sale prices of Brooks common stock
and PRI common stock as reported on the Nasdaq National Market and the estimated
equivalent per share price, as explained below, of PRI common stock on October
23, 2001, the last full trading day before the public announcement of the
proposed merger, and on April 8, 2002, the latest practicable date before the
mailing of this joint proxy statement/prospectus.



                                              BROOKS          PRI        EQUIVALENT PRI PER
                                           COMMON STOCK   COMMON STOCK      SHARE PRICE
                                           ------------   ------------   ------------------
                                                                
October 23, 2001.........................     $33.11         $12.54            $17.22
April 8, 2002............................     $37.40         $19.39            $19.45


     The equivalent per share price of PRI common stock equals the exchange
ratio of 0.52 multiplied by the price of a share of Brooks common stock. If the
merger had occurred on April 8, 2002, each holder of PRI common stock would have
received 0.52 shares of Brooks common stock worth $19.45 for each share of PRI
common stock such holder owned on that date. The actual equivalent per share
price of PRI common stock that each holder of PRI common stock will receive if
the merger is completed may be different from this price because the per share
price of Brooks common stock on the Nasdaq National Market fluctuates
continuously. We urge you to obtain current market quotations for Brooks common
stock and PRI common stock. We cannot give you any assurances as to the future
prices or markets for Brooks common stock or PRI common stock.

                                        94


                            BROOKS AUTOMATION, INC.

          UNAUDITED PRO FORMA COMBINED CONDENSED FINANCIAL STATEMENTS

     On October 23, 2001, Brooks and PRI entered into the merger agreement.
Pursuant to the merger agreement and subject to its terms and conditions, PRI
common stockholders will receive 0.52 shares of Brooks common stock for each
share of PRI common stock.

     The merger, which is expected to close in the first calendar quarter of
2002, is contingent upon the fulfillment of specified conditions, including all
required regulatory approvals, the approval of the merger by the stockholders of
PRI and the approval of the issuance of Brooks common stock in connection with
the merger by the stockholders of Brooks. The merger will be accounted for as a
purchase of assets.

     On October 5, 2001, Brooks acquired certain of the assets of General
Precision, Inc., or GPI, in exchange for 850,000 shares of Brooks common stock,
with a market value of approximately $26.2 million at the time of issuance
(based upon the average closing price for two days before and the day of the
consummation of the transaction), subject to post-closing adjustments. GPI,
located in Valencia, California, is a supplier of high-end environmental
solutions for the semiconductor industry. The transaction was accounted for as a
purchase of assets. The consolidated balance sheet of Brooks at December 31,
2001 includes the assets acquired and liabilities assumed of GPI. The results of
operations of GPI for the period subsequent to October 5, 2001 are included
within the unaudited historical consolidated statement of operations data of
Brooks for the quarter ended December 31, 2001.

     The following tables show summary unaudited pro forma financial information
as if Brooks, GPI and PRI had been combined as of the beginning of the period
for statement of operations purposes and as if Brooks and PRI had been combined
as of December 31, 2001 for balance sheet purposes.

     The unaudited pro forma combined financial information is based on
estimates and assumptions, which are preliminary and have been made solely for
purposes of developing such pro forma information. The estimated pro forma
adjustments arising from the acquisitions of PRI and GPI are derived from the
estimates of purchase price paid and estimated fair values of the assets
acquired and liabilities assumed. The final determination of purchase price,
fair value and resulting goodwill may differ significantly from that reflected
in the pro forma statement of operations and balance sheet. The pro forma
information is presented for illustrative purposes only and is not necessarily
indicative of the operating results or financial position that would have
occurred if each transaction had been consummated as of October 1, 2000 for
statement of operations or December 31, 2001, for financial position,
respectively, nor is it necessarily indicative of future operating results or
financial position. The unaudited pro forma combined financial information
should be read in conjunction with the historical consolidated financial
statements of Brooks and PRI and related notes thereto, and "Management's
Discussion and Analysis of Financial Condition and Results of Operations" of
Brooks and PRI contained in their respective annual reports and quarterly
reports, and other information Brooks and PRI have filed with the SEC, and the
audited financial statements of GPI included in Brooks' current report on Form
8-K/A filed April 4, 2002.

     The fiscal year end of GPI was December 31. The pro forma statement of
operations for the year ended September 30, 2001 includes the unaudited results
for the fourth quarter of the fiscal year ended December 31, 2000 and the first,
second and third quarters of fiscal 2001 of GPI.

                                        95


                            BROOKS AUTOMATION, INC.

              UNAUDITED PRO FORMA COMBINED CONDENSED BALANCE SHEET

                               DECEMBER 31, 2001
                                 (IN THOUSANDS)



                                                                                        PRI
                                                                                    ACQUISITION
                                                         HISTORICAL   HISTORICAL     PRO FORMA      PRO FORMA
                                                         BROOKS(A)      PRI(B)      ADJUSTMENTS      COMBINED
                                                         ----------   ----------   --------------   ----------
                                                                                        
ASSETS
Current assets
  Cash and equivalents.................................   $130,151     $ 62,502      $       --     $  192,653
  Marketable securities................................     40,013           --              --         40,013
  Accounts receivable, net.............................     85,937       19,468              --        105,405
  Inventories..........................................     54,450       80,777          (2,750)(1)    132,477
  Prepaid expenses and other current assets............     12,460        9,509              --         21,969
  Deferred income taxes................................     25,679           --          24,987(1)      50,666
                                                          --------     --------      ----------     ----------
    Total current assets...............................    348,690      172,256          22,237        543,183
Fixed assets, net......................................     69,488       16,924          (3,200)(1)     83,212
Intangible assets, net.................................     55,760        1,834         213,744(1)     271,338
Goodwill, net..........................................     86,665        1,438         230,304(1)     318,407
Long-term marketable securities........................    132,474           --              --        132,474
Deferred income taxes..................................     21,167           --          58,324(1)      79,491
Other assets...........................................     16,156       15,638              --         31,794
                                                          --------     --------      ----------     ----------
    Total assets.......................................   $730,400     $208,090      $  521,409     $1,459,899
                                                          ========     ========      ==========     ==========
LIABILITIES, MINORITY INTERESTS AND STOCKHOLDERS'
  EQUITY
Current liabilities
  Notes payable........................................   $ 19,249     $     --      $       --     $   19,249
  Current portion of long-term debt....................         79           --              --             79
  Accounts payable.....................................     15,018       11,119              --         26,137
  Accrued expenses and other current liabilities.......     69,037       89,038          38,791(1)     196,866
                                                          --------     --------      ----------     ----------
    Total current liabilities..........................    103,383      100,157          38,791        242,331
Long-term debt.........................................    175,564           --              --        175,564
Deferred income taxes..................................      5,536           --          86,242(1)      91,778
Other long-term liabilities............................      2,198          729             546(1)       3,473
                                                          --------     --------      ----------     ----------
  Total liabilities....................................    286,681      100,886         125,579        513,146
                                                          --------     --------      ----------     ----------
Minority interests.....................................        705           --              --            705
                                                          --------     --------      ----------     ----------
Stockholders' equity
  Common stock.........................................        200          257            (124)(1)        333
  Additional paid-in capital...........................    503,853      261,229         265,196(1)   1,030,278
  Accumulated other comprehensive income (loss)........     (6,267)       1,661          (1,661)(1)     (6,267)
  Deferred compensation................................     (1,618)          --         (23,524)(1)    (25,142)
  Retained earnings (accumulated deficit)..............    (53,154)    (155,943)        155,943(1)     (53,154)
                                                          --------     --------      ----------     ----------
    Total stockholders' equity.........................    443,014      107,204         395,830        946,048
                                                          --------     --------      ----------     ----------
    Total liabilities, minority interests and
      stockholders' equity.............................   $730,400     $208,090      $  521,409     $1,459,899
                                                          ========     ========      ==========     ==========


    See Notes to Unaudited Pro Forma Combined Condensed Financial Statements
---------------

(A) As reported in Brooks' quarterly report on Form 10-Q/A for the three months
    ended December 31, 2001 as filed with the SEC.

(B) As reported in PRI's quarterly report on Form 10-Q/A for the three months
    ended December 30, 2001 as filed with the SEC.

                                        96


                            BROOKS AUTOMATION, INC.

         UNAUDITED PRO FORMA COMBINED CONDENSED STATEMENT OF OPERATIONS

                     FOR THE YEAR ENDED SEPTEMBER 30, 2001
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)



                                                           GPI                                          PRI
                                                       ACQUISITION        PRO FORMA                 ACQUISITION
                             HISTORICAL   HISTORICAL    PRO FORMA          COMBINED    HISTORICAL    PRO FORMA          PRO FORMA
                             BROOKS(A)       GPI       ADJUSTMENTS        BROOKS/GPI     PRI(B)     ADJUSTMENTS         COMBINED
                             ----------   ----------   -----------        ----------   ----------   -----------         ---------
                                                                                                   
Revenues...................   $381,716     $15,487       $    --           $397,203     $268,558     $     --           $ 665,761
Cost of revenues...........    229,332       8,748            --            238,080      233,228        1,264(5)          472,572
                              --------     -------       -------           --------     --------     --------           ---------
  Gross profit.............    152,384       6,739            --            159,123       35,330       (1,264)            193,189
                              --------     -------       -------           --------     --------     --------           ---------
Operating expenses
                                                                                                        1,436(5)
  Research and
    development............     60,868          --            --             60,868       62,175         (552)(6)         123,927
                                                                                                        3,045(5)
  Selling, general and
    administrative.........     95,919       5,157            --            101,076       50,373          148(7)          154,642
  Amortization of acquired
    intangible assets......     30,187          --         3,619(2)          33,806           --       71,859(2)          105,665
  Acquisition-related,
    restructuring and other
    costs..................      9,314          --            --              9,314       17,340           --              26,654
                              --------     -------       -------           --------     --------     --------           ---------
    Total operating
      expenses.............    196,288       5,157         3,619            205,064      129,888       75,936             410,888
                              --------     -------       -------           --------     --------     --------           ---------
Income (loss) from
  operations...............    (43,904)      1,582        (3,619)           (45,941)     (94,558)     (77,200)           (217,699)
  Interest (income)
    expense, net...........     (8,471)       (153)           --             (8,624)      (3,349)          --             (11,973)
  Other (income) expense,
    net....................      1,090          --            --              1,090           (4)          --               1,086
                              --------     -------       -------           --------     --------     --------           ---------
Income (loss) before income
  taxes and minority
  interests................    (36,523)      1,735        (3,619)           (38,407)     (91,205)     (77,200)           (206,812)
                                                             704(3)                                       (59)(7)
Income tax provision
  (benefit)................     (6,439)         42        (1,556)(4)         (7,249)       2,091      (36,261)(8)         (41,478)
                              --------     -------       -------           --------     --------     --------           ---------
Income (loss) before
  minority interests.......    (30,084)      1,693        (2,767)           (31,158)     (93,296)     (40,880)           (165,334)
Minority interests in loss
  of consolidated
  subsidiary...............       (424)         --            --               (424)          --           --                (424)
                              --------     -------       -------           --------     --------     --------           ---------
Income (loss) from
  continuing operations....   $(29,660)    $ 1,693       $(2,767)          $(30,734)    $(93,296)    $(40,880)          $(164,910)
                              ========     =======       =======           ========     ========     ========           =========
Loss per share from
  continuing operations:
  Basic....................   $  (1.65)                                    $  (1.63)                                    $   (5.12)
  Diluted..................   $  (1.65)                                    $  (1.63)                                    $   (5.12)
Shares used to compute loss
  per share from continuing
  operations:
  Basic....................     18,015                       850             18,865                    13,350              32,215
  Diluted..................     18,015                       850             18,865                    13,350              32,215


    See Notes to Unaudited Pro Forma Combined Condensed Financial Statements
---------------
(A) As reported in Brooks' annual report on Form 10-K/A for fiscal 2001 as filed
    with the SEC.

(B) As reported in PRI's annual report on Form 10-K/A for fiscal 2001 as filed
    with the SEC.

                                        97


                            BROOKS AUTOMATION, INC.

         UNAUDITED PRO FORMA COMBINED CONDENSED STATEMENT OF OPERATIONS

                  FOR THE THREE MONTHS ENDED DECEMBER 31, 2001
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)



                                                                      PRI
                                                                  ACQUISITION
                                        HISTORICAL   HISTORICAL    PRO FORMA    PRO FORMA
                                        BROOKS(A)      PRI(B)     ADJUSTMENTS   COMBINED
                                        ----------   ----------   -----------   ---------
                                                                    
Revenues..............................   $ 61,455     $54,893      $     --     $116,348
Cost of revenues......................     37,341      42,188           314(5)    79,843
                                         --------     -------      --------     --------
  Gross profit........................     24,114      12,705          (314)      36,505
                                         --------     -------      --------     --------

Operating expenses
                                                                        357(5)
  Research and development............     14,134       9,496          (206)(6)   23,781
                                                                        756(5)
  Selling, general and
     administrative...................     18,905      10,124            37(7)    29,822
  Amortization of acquired intangible
     assets...........................      3,633          --        17,965(2)    21,598
  Acquisition-related, restructuring
     and other costs..................        100          --            --          100
                                         --------     -------      --------     --------
  Total operating expenses............     36,772      19,620        18,909       75,301
                                         --------     -------      --------     --------
Income (loss) from operations.........    (12,658)     (6,915)      (19,223)     (38,796)
  Interest (income) expense, net......       (246)         --            --         (246)
  Other (income) expense, net.........       (553)       (680)           --       (1,233)
                                         --------     -------      --------     --------
Income (loss) before income taxes and
  minority interests..................    (11,859)     (6,235)      (19,223)     (37,317)
                                                                        (15)(7)
Income tax provision (benefit)........     (4,068)        519        (2,412)(8)   (5,976)
                                         --------     -------      --------     --------
Income (loss) before minority
  interests...........................     (7,791)     (6,754)      (16,796)     (31,341)
Minority interests in loss of
  consolidated subsidiary.............        (57)         --            --          (57)
                                         --------     -------      --------     --------
Income (loss) from continuing
  operations..........................   $ (7,734)    $(6,754)     $(16,796)    $(31,284)
                                         ========     =======      ========     ========
Loss per share from continuing
  operations:
  Basic...............................   $  (0.39)                              $  (0.94)
  Diluted.............................   $  (0.39)                              $  (0.94)
Shares used to compute loss per share
  from continuing operations:
  Basic...............................     19,886                    13,350       33,236
  Diluted.............................     19,886                    13,350       33,236


    See Notes to Unaudited Pro Forma Combined Condensed Financial Statements
---------------
(A) As reported in Brooks' quarterly report on Form 10-Q/A for the three months
    ended December 31, 2001 as filed with the SEC.

(B) As reported in PRI's quarterly report on Form 10-Q/A for the three months
    ended December 30, 2001 as filed with the SEC.

                                        98


                            BROOKS AUTOMATION, INC.

                NOTES TO UNAUDITED PRO FORMA COMBINED CONDENSED
                              FINANCIAL STATEMENTS

(1) To record the purchase accounting of the assets to be acquired and the
    liabilities to be assumed of PRI subject to adjustment pending the
    completion of a post-closing review of the purchased assets. The pro forma
    information assumes that Brooks will issue 13,350,412 shares of its common
    stock as the consideration for the acquisition of PRI, based upon the
    outstanding shares of PRI common stock at December 31, 2001 of 25,673,870 at
    a conversion rate of 0.52 shares of Brooks common stock per share of PRI
    common stock and will exchange PRI stock options for Brooks stock options at
    the same conversion rate. The fair value of Brooks common stock per share
    was calculated as $33.60 per share, which represents the average closing
    price for two days before, the day of and two days after the announcement of
    the merger, on October 24, 2001. Brooks has calculated the fair value of the
    options to be exchanged to be $78.0 million as of December 31, 2001 using
    the Black-Scholes option pricing model, a fair value of Brooks common stock
    of $33.60 per share, volatility of 100%, an expected option life of four
    years, zero dividends and a risk free rate of 4.12%, in accordance with
    Financial Accounting Standards Board Interpretation No. 44, "Accounting for
    Certain Transactions Involving Stock Compensation -- an interpretation of
    APB Opinion No. 25." Brooks also has accounted for $15.8 million for
    anticipated transaction fees, which include $7.2 million of legal and
    accounting fees, $7.5 million of investment bankers fees, $0.4 million of
    tax structuring fees, $0.5 million of intellectual property filing fees and
    $0.2 million of due diligence fees.

    The acquisition of PRI by Brooks will give rise to the consolidation and
    elimination of certain PRI duplicate facilities and redundant PRI personnel.
    Brooks has provided certain pro forma balance sheet adjustments in
    accordance with Emerging Issue Task Force No. 95-3, "Recognition of
    Liabilities in Connection with a Purchase Business Combination." Brooks
    anticipates headcount reductions of approximately 300 people across all
    functional areas of the combined company and, as such, has included an
    estimated charge for workforce reductions of $10.4 million comprised of
    severance, employee benefits, and outplacement support. These payments are
    expected to occur during the six months following the merger. The former
    chief executive officer of PRI has entered into a non-competition agreement
    with Brooks which will become effective upon completion of the combination
    and which will require a total payment of $1.1 million over a two-year
    period, of which $0.6 million has been recorded as a long term liability.
    The intrinsic value of the unvested options to be exchanged in the
    acquisition has been estimated at $23.5 million and will be recorded as
    deferred compensation. The deferred compensation will be recognized over the
    remaining vesting period of the options, which range up to five years.
    Brooks has preliminarily identified redundant facilities consisting of sales
    and support offices, manufacturing facilities, and administrative offices.
    As such, an accrual of $11.0 million to terminate lease obligations under
    these agreements has been included as an adjustment. These payments
    represent the minimum rental commitment on facilities with lease terms to
    2011. Brooks has estimated fixed assets of approximately $3.2 million will
    be abandoned or rendered obsolete and disposed of, related to the exiting of
    facilities and the integration of PRI's business with Brooks' business and
    financial systems. Brooks has identified certain of PRI's product lines
    which compete directly with Brooks' existing product lines. These PRI
    product lines will be discontinued and, as a result, an estimate reflecting
    a charge for inventory obsolescence of $2.75 million was recorded to
    inventory and $1.0 million was recorded to accrued expenses for future
    purchase commitments for these product lines. These duplicate inventory and
    fixed asset items will be disposed of through the use of third party asset
    reclamation firms. The discontinuation of those product lines is not
    expected to have a material adverse impact on the combined company. Brooks
    has increased its net deferred tax assets by $83.3 million, less $86.2
    million of deferred tax liabilities incurred related to the identifiable
    intangible assets to be acquired, for a net deferred tax liability of $2.9
    million.

    Brooks believes the above actions are an integral component of the
    acquisition plan to enable the benefits of the combined companies to be
    optimized and the benefits of the acquisition to be realized. Brooks expects
    to complete these restructuring efforts within one year.

                                        99


    A summary of the transaction is as follows (in thousands):


                                                           
Estimated consideration:
  Stock.....................................................  $448,547
  Stock options.............................................    78,011
  Transaction costs.........................................    15,800
                                                              --------
     Total estimated consideration..........................   542,358
                                                              --------
Net tangible assets acquired................................   103,932
                                                              --------
Estimated acquisition adjustments:
  Workforce reductions......................................    10,445
  Non-competition agreement.................................     1,092
  Deferred compensation.....................................   (23,524)
  Duplicate facilities and fixed assets.....................    14,200
  Duplicate inventory and inventory purchase commitments....     3,750
  Deferred income taxes.....................................     2,931
                                                              --------
     Total estimated acquisition adjustments................     8,894
                                                              --------
  Estimated excess of purchase price over net tangible
     assets acquired........................................  $447,320
                                                              ========
Preliminary allocation of excess of purchase price over net
  tangible assets acquired:
  Identifiable intangible assets............................  $215,578
  Goodwill..................................................   231,742
                                                              --------
  Estimated excess of purchase price over net tangible
     assets acquired........................................  $447,320
                                                              ========


    Brooks believes the $215,578,000 of identifiable intangible assets will be
    allocated to completed technology, customer relationships, patents,
    non-competition and license agreements.

    Adjustments to PRI historical data made in determining the net tangible
    assets acquired of $103,932,000 include the elimination of $1,834,000 of
    intangible assets and $1,438,000 of goodwill previously recognized as assets
    by PRI.

(2) To record amortization expense for the identifiable intangible assets.
    Finalization of the allocation of the purchase price to tangible and
    identifiable intangible assets acquired and liabilities assumed is
    preliminary pending collection of data to evaluate estimates of future
    revenues and earnings to determine a discounted cash flow valuation of
    certain intangibles that meet the separate recognition criteria of FAS 141.
    Brooks expects this process and subsequent allocation of purchase price to
    be complete within 60 days of the closing of the transaction. Brooks'
    preliminary assessment is that the weighted average useful life of the
    acquired identifiable intangible assets will be three years. The acquired
    identifiable intangible assets will be amortized using the straight-line
    method. A change in the allocation between the acquired identifiable
    intangible assets and goodwill for both GPI and PRI of $1,000,000 would
    result in a change in pro forma annual amortization expense of approximately
    $333,000. An increase in the weighted average useful life of the acquired
    identifiable intangible assets from three years to four years would result
    in a decrease in pro forma annual amortization expense of approximately
    $18,869,000 and $4,717,000 for the year ended September 30, 2001 and the
    three months ended December 31, 2001, respectively. A decrease in the
    weighted average useful life of the acquired identifiable intangible assets
    from three years to two years would result in an increase in pro forma
    annual amortization expense of approximately $37,739,000 and $9,435,000 for
    the year ended September 30, 2001 and the three months ended December 31,
    2001, respectively.

(3) To adjust the income tax expense recorded by GPI in its historical
    statements of operations to reflect the 43.0% tax rate applicable to a
    subsidiary of Brooks operating in California. This adjustment results in
    additional pro forma tax expense of $704,000 for the year ended September
    30, 2001.

                                       100


(4) To record the income tax effect of the pro forma adjustment to amortization
    of acquired intangible assets. This adjustment was recorded at 43.0%, and
    results in a reduction of pro forma tax expense by $1,556,000 for the year
    ended September 30, 2001.

(5) To record amortization of deferred compensation arising from the proposed
    acquisition. Incremental pro forma compensation expense of $1,264,000,
    $1,436,000, and $3,045,000 was recorded to cost of revenues, research and
    development, and selling, general and administrative expenses, respectively,
    for the year ended September 30, 2001 and $314,000, $357,000, and $756,000,
    respectively, for the three months ended December 31, 2001.

(6) To reverse amortization expense related to intangible assets of PRI existing
    prior to the proposed acquisition. Amortization expense of $552,000 and
    $206,000 was reversed from research and development expense for the year
    ended September 30, 2001 and the three months ended December 31, 2001,
    respectively.

(7) To record additional pro forma compensation expense of $148,000 and related
    income tax benefit of $59,000 for the year ended September 30, 2001 and
    $37,000 and related income tax benefit of $15,000 for the three months ended
    December 31, 2001, calculated at the applicable tax rate of 40%, related to
    the terms of the employment agreement between Brooks and its president,
    Robert J. Therrien. This salary increase is effective upon completion of the
    merger of Brooks with PRI.

(8) To record temporary tax differences arising on acquisition of PRI and to
    record the pro forma benefit of taxable losses of $36,261,000 for the year
    ended September 30, 2001 and $2,412,000 for the three months ended December
    30, 2001 which would have been capitalized if the acquisition had occurred
    on October 1, 2000 and October 1, 2001, respectively. Adjustments were
    recorded utilizing the Brooks applicable tax rate of 40%.

The acquisition of PRI by Brooks Automation will give rise to the consolidation
and elimination of certain duplicate Brooks facilities and redundant Brooks
personnel. Brooks anticipates headcount reductions of approximately 90 people
across all functional areas of the business and will include an estimated charge
for workforce reductions related to its current operations of $12.9 million
comprised of severance, employee benefits, and outplacement support. Brooks has
preliminarily identified redundant facilities consisting of sales and support
offices, manufacturing facilities, and administrative offices. As such, an
accrual of $2.0 million to terminate lease obligations under these agreements
will be included as an adjustment. Brooks has estimated fixed assets of
approximately $5.0 million will be abandoned or rendered obsolete and disposed
of, related to the exiting of facilities and the integration of PRI onto Brooks'
business and financial systems. In addition, incremental capital expenditures of
$8.8 million are estimated for incremental leasehold improvements and
information technology requirements. Brooks has identified certain of its
product lines that compete directly with PRI's existing product lines. These
Brooks' product lines will be discontinued and, as such, an estimate reflecting
a charge for inventory obsolescence of $13.6 million will be recorded to
inventory. These duplicate inventory and fixed asset items will be disposed of
through the use of third party asset reclamation firms. The exiting of those
product lines is not expected to have a material adverse impact on the combined
company. Brooks expects to incur integration and transition related expenses of
$12.1 million. As a result of the merger, Brooks' chief executive officer will
vest in certain incremental retirement benefits, and as such an incremental
accrual of $2.8 million will be provided.

                                       101


                        COMPARISON OF STOCKHOLDER RIGHTS

     This section of the joint proxy statement/prospectus describes some of the
differences between the rights of holders of PRI common stock and the rights of
holders of Brooks common stock. Although we believe that this description covers
all of the material differences between the rights of these stockholders, this
summary may not contain all of the information that is important to you. You
should carefully read this entire joint proxy statement/prospectus and any other
documents to which we refer for a more complete understanding of the differences
between being a stockholder of PRI and being a stockholder of Brooks.

     PRI's stockholders' rights are presently governed by Massachusetts law and
PRI's charter and bylaws. Upon completion of the merger, the stockholders of PRI
will become stockholders of Brooks, and, as a result, their rights will be
governed by Delaware law and Brooks' charter and bylaws.

SIZE OF THE BOARD OF DIRECTORS

     In accordance with Massachusetts law, PRI's bylaws provide that PRI's board
of directors must consist of at least three individuals, except when there are
only two stockholders, in which case the number of directors must be no less
than two, and when there is only one stockholder, in which case the board of
directors must consist of at least one director. Currently, PRI has six
directors.

     Delaware law requires that a corporation's board of directors consist of at
least one member. Brooks' bylaws allow the board of directors serving during any
given year to fix the number of directors that will serve the corporation the
following year. Brooks currently has five directors; if the merger is
consummated, the board of directors of Brooks will be increased from five to
seven directors. Therefore, there will be more directors on the post-merger
board of directors of Brooks than on the current board of directors of PRI.
However, the difference in the number of directors will have little practical
effect because the numbers of directors required to constitute a quorum and to
take action will be the same for the post-merger seven member board of directors
of Brooks as they have been for PRI's current six member board of directors.

LOANS TO OFFICERS AND EMPLOYEES

     Under Massachusetts law, unless a majority of the directors who are not
direct or indirect recipients of a loan approves or ratifies the making of that
loan as one that is reasonably expected to benefit the corporation, then the
officers who participate in, and the directors who vote for that loan are
jointly and severally liable to the corporation for any portion of that loan
that is not repaid. The PRI charter generally allows any director or officer to
enter into any contract of any kind with PRI regardless of whether the director
or officer derives personal profits or otherwise benefits from the contract.
Under Delaware law, a corporation may make loans to, guarantee the obligations
of, or otherwise assist its officers or other employees and those of its
subsidiaries (including directors who are also officers or employees) when the
action, in the judgment of the directors, may reasonably be expected to benefit
the corporation. The Brooks bylaws generally allow any director or officer to
enter into any contract of any kind with Brooks, regardless of whether the
director or officer derives personal profits or otherwise benefits from the
contract. Both Massachusetts law and Delaware law provide that directors must
approve loans by a corporation to its officers and employees. To the extent
Massachusetts law provides that only disinterested directors may vote to approve
these loans and Delaware law does not explicitly limit the vote of directors in
this manner, there are fewer restrictions on the ability of Brooks to make loans
to its officers and employees compared to that of PRI.

POWER TO CALL SPECIAL STOCKHOLDERS' MEETINGS; ADVANCE NOTICE OF STOCKHOLDER
BUSINESS AND NOMINEES

     In accordance with Massachusetts law and PRI's bylaws, a special meeting of
PRI stockholders may be called by the president, the board of directors, or the
chairman of the board, or upon written application of one or more stockholders
who hold at least 40% of the capital stock entitled to vote at a meeting. Under
Delaware law, a special meeting of stockholders may be called by the board of
directors or by any

                                       102


other person authorized to do so in the charter or the bylaws. Brooks' bylaws
provide that the president or the board of directors may call a special meeting
of the Brooks stockholders at any time. However, in contrast to the authority of
PRI's stockholders to call a special meeting, Brooks' stockholders do not have
the authority to call a special meeting of the stockholders.

STOCKHOLDER VOTING

     In accordance with Massachusetts law, PRI's bylaws allow for one vote for
each share of stock and a proportional vote for each fractional share. PRI may
not, directly or indirectly, vote any shares of its own capital stock. Under
Brooks' bylaws, when a quorum is present, most actions of the stockholders are
determined by a majority of the stock present in person or represented by proxy.
Any election of directors by stockholders is authorized by a plurality of the
votes cast by the stockholders present or represented by proxy. Under Delaware
law, class voting is generally not required. The Brooks charter, however,
provides that any vote required by the stockholders pursuant to Delaware law,
other than the election of directors, will be effective if recommended by a
majority of the "continuing directors," as defined in the Brooks charter, and
approved by the vote of a majority of each class of stock outstanding and
entitled to vote thereon. If any vote is not recommended by a majority of the
continuing directors, then the vote of 80% of each class of stock outstanding
and entitled to vote thereon is required for the vote to be effective. Under
Brooks' charter a "continuing director" is:

     - a director who is not an affiliate of any "related person" or who was a
       director before that related person became a related person;

     - any successor to a continuing director who is unaffiliated with any
       related person and is recommended by a majority of the continuing
       directors; or

     - any new director who is designated as a continuing director by a majority
       of the continuing directors.

     In general, Brooks' charter defines "related person" to mean any individual
or group, other than individuals who were stockholders of Brooks on November 14,
1994, that acquires beneficial ownership of 5% or more of Brooks' stock entitled
to vote in the election of directors. Therefore, it might be more difficult for
the stockholders of Brooks to take action than is the case for the stockholders
of PRI. This provision of the Brooks charter may make it more difficult for a
third party to gain control of Brooks.

APPRAISAL RIGHTS

     Under Section 76 of the Massachusetts Business Corporation Law, a
stockholder of a Massachusetts corporation who complies with the statutorily
prescribed procedures is entitled to payment for his or her stock in the event
that the corporation sells, leases or exchanges all or substantially all of its
property and assets, adopts any amendment of its charter that adversely affects
the rights of such stockholder, or merges with another corporation or
corporations in a transaction requiring the approval of its stockholders. Unlike
Delaware law, Massachusetts law provides this right even when the corporation
has a class of stock listed on a national securities exchange or held by more
than 2,000 holders of record.

     Section 262 of the Delaware General Corporation Law provides for appraisal
rights only in the case of a statutory merger or consolidation of the
corporation where the approval of the transaction by the stockholders is
required under Delaware law and the petitioning stockholder does not consent to
the transaction. There are no appraisal rights, unless otherwise provided for in
a corporation's charter, for shares of stock listed on a national securities
exchange or designated as a national market system security on an interdealer
quotation system by the National Association of Securities Dealers, Inc., or for
shares of stock held by more than 2,000 holders of record, unless such
stockholders would be required to accept anything other than shares of stock of
the surviving corporation or shares of another corporation so listed or held by
such number of holders of record. The Brooks charter does not provide for
appraisal rights. Therefore, PRI stockholders who become Brooks stockholders
will not have appraisal rights in future transactions provided that the
statutory tests continue to be met.

                                       103


STOCKHOLDER APPROVAL OF CERTAIN BUSINESS COMBINATIONS

     Massachusetts has adopted a "control share" statute (Chapter 110D of the
Massachusetts General Laws) under which a person who acquires voting stock of a
Massachusetts corporation that results in such person's voting power exceeding
one of three specified thresholds loses the right to vote such stock beyond that
threshold unless the holders of a majority of the voting stock of the
corporation, excluding the interested stockholder, vote to reinstate the
stockholder's voting rights. PRI has opted out of the control share statute and
therefore it has no current effect on PRI.

     Massachusetts also has adopted a "business combination" statute (Chapter
110F of the Massachusetts General Laws). In general, unless a corporation opts
out by amending its charter or bylaws, this statute prohibits a publicly held
Massachusetts corporation with sufficient ties to Massachusetts from engaging in
a "business combination" with an "interested stockholder" for a period of three
years after the date of the transaction in which the person becomes an
interested stockholder, unless:

     - prior to the date on which such stockholder becomes an interested
       stockholder, the board of directors approves either the business
       combination or the transaction which resulted in the stockholder becoming
       an interested stockholder;

     - the interested stockholder owns 90% or more of the corporation's
       outstanding voting stock upon completion of the transaction which made
       him an interested stockholder, excluding shares held by certain
       affiliates of the corporation and shares owned by employee stock options
       plans in which the participants cannot determine confidentially whether
       or not the shares would be tendered in response to a tender or an
       exchange offer; or

     - on or after the date such person becomes an interested stockholder, the
       business combination is approved by both the board of directors and
       two-thirds of the outstanding voting stock of the corporation, excluding
       shares held by the interested stockholder.

     An "interested stockholder" is a person who, together with affiliates and
associates, owns, or at any time within the prior three years did own, 5% or
more of the corporation's voting stock. A "business combination" is a merger,
stock sale, asset sale or other transaction resulting in a financial benefit to
the stockholder. PRI has not opted out of Chapter 110F, although it could do so
at any time by a vote of the holders of a majority of its voting stock. Such an
amendment would not be effective for twelve months and would not apply to a
business combination with any person who became an interested stockholder on or
prior to the date of the amendment.

     Delaware also has adopted a "business combination" statute. Under this
statute, a Delaware corporation is generally prohibited from engaging in a
business combination with an "interested stockholder" for a three year period
following the time when the stockholder became an interested stockholder,
unless:

     - the board of directors approved that transaction before the stockholder
       became an interested stockholder;

     - upon becoming an interested stockholder, the interested stockholder owned
       at least 85% of the voting stock of the corporation; or

     - the board of directors and the holders of at least two-thirds of the
       outstanding voting stock that is not owned by the interested stockholder
       vote to approve the transaction at a meeting and not by written consent.

     Except as specified by law, an "interested stockholder" is defined to
include any person that is:

     - the owner of 15% or more of the outstanding voting stock of the
       corporation;

     - an affiliate or associate of the corporation and was the owner of 15% or
       more of the outstanding voting stock of the corporation at any time
       within three years immediately prior to the relevant date; or

     - an affiliate or associate of any such person.

                                       104


     Both Massachusetts and Delaware have "business combination" laws that have
an antitakeover effect with respect to hostile takeovers. However, the
Massachusetts law may prohibit a broader scope of transactions than the Delaware
law because of the lower thresholds found in the definition of an "interested
person" and the higher ownership requirement necessary to avoid the prohibition.

REMOVAL OF DIRECTORS BY STOCKHOLDERS

     In accordance with Massachusetts law, PRI's bylaws provide that the
stockholders may remove any director with or without cause by vote of the
holders of the majority of the shares entitled to vote in the election of
directors. PRI's bylaws further provide that the directors may, by a vote of the
majority of directors then in office, remove any director for cause. Removal of
a director for cause by the board or by stockholders may occur only after the
director has been given reasonable notice and an opportunity to be heard before
the board of directors.

     Under Delaware law, directors may be removed with or without cause by the
holders of a majority of shares entitled to vote in the election of directors,
with exceptions for a classified board of directors or where cumulative voting
is allowed, and unless the charter provides otherwise. The Brooks charter
provides that any vote required by the stockholders, other than the election of
directors, will be effective if recommended by the continuing directors of
Brooks and approved by the vote of a majority of each class of stock outstanding
and entitled to vote thereon. If any vote is not recommended by a majority of
the continuing directors, then the vote of 80% of each class of stock
outstanding and entitled to vote thereon is required for the vote to be
effective. Brooks does not have a classified board of directors and does not
allow cumulative voting.

     Therefore, unlike a member of the PRI board of directors, a member of the
Brooks board of directors may only be removed for cause and after reasonable
notice and an opportunity to be heard. Additionally, a greater stockholder vote
will be necessary to remove a board member of Brooks than a board member of PRI
if not recommended by continuing directors.

FILLING VACANCIES ON THE BOARD OF DIRECTORS

     Under Massachusetts law, the filling of vacancies occurs in the manner
prescribed by the bylaws or, in the absence of a bylaw, then by vote of the
directors. PRI's bylaws state that any vacancy may be filled by the vote of a
majority of the directors then in office, or by a plurality vote of the
stockholders at a meeting called for that purpose.

     In accordance with Delaware law, Brooks' bylaws provide that any vacancy on
the board of directors shall be filled by a majority vote of the directors then
in office. Unlike stockholders of PRI, stockholders of Brooks do not have the
ability to fill a vacancy on the board of directors.

PREFERRED STOCK

     PRI's charter authorizes its board of directors to issue, without
stockholder approval, up to 400,000 shares of PRI preferred stock. PRI has
designated 10,000 shares of preferred stock as class one participating
cumulative preferred stock, 250,000 shares of preferred stock as Series A
participating cumulative preferred stock and one share of preferred stock as
special voting preferred stock. Currently, only the one share of special voting
preferred stock is issued and outstanding. The Brooks charter authorizes its
board of directors to issue, without stockholder approval, up to 1,000,000
shares of Brooks preferred stock. Brooks has designated 21,500 shares of
preferred stock as Series A junior participating preferred stock. None of the
Brooks preferred stock is issued and outstanding.

     Both PRI's and Brooks' board of directors may, subject to applicable law
and the rules of the Nasdaq Stock Market, authorize the issuance of preferred
stock at such time, and for such purposes, and for such consideration, as they
deem advisable without stockholder approval. The ability of PRI and Brooks to
issue shares of preferred stock up to the amounts prescribed in their respective
charters could have an antitakeover effect. To the extent Brooks has more shares
of preferred stock authorized, the ability of the

                                       105


Brooks board of directors to issue such shares may have more of an antitakeover
effect than the ability of the PRI board of directors to issue such shares.

INDEMNIFICATION AND LIMITATION OF LIABILITY

     Massachusetts law allows a corporation to include in its charter a
provision that limits or eliminates the personal liability of directors to the
corporation and its stockholders for monetary damages for breach of fiduciary
duty as a director. Massachusetts law does not, however, permit a corporation to
limit or eliminate the personal liability of a director for (i) any breach of
the director's duty of loyalty to the corporation or its stockholders, (ii) acts
or omissions not in good faith or which involve intentional misconduct or a
knowing violation of law, (iii) payment of dividends or stock repurchase or
redemption, except a distribution of stock of the corporation, in violation of
the corporation's charter, (iv) any loans to any officer or director of the
corporation or (v) any transaction from which the director derived an improper
personal benefit. PRI's charter limits its directors' liability to the fullest
extent permitted by Massachusetts law.

     Massachusetts law provides that indemnification of directors, officers,
employees and other agents of a corporation, and persons who serve at its
request as directors, officers, employees and other agents of another
organization, or who serve at its request in any capacity with respect to an
employee benefit plan, may be provided by a corporation to whatever extent
specified in or authorized by (i) its charter, (ii) a bylaw adopted by its
stockholders, or (iii) a vote adopted by the holders of a majority of its shares
of stock entitled to vote on the election of directors. PRI's charter provides
that PRI will indemnify its directors and its officers elected or appointed by
its board of directors or stockholders, as well as persons serving at the
request of PRI's board of directors as directors, officers, employees or agents
of other enterprises, to the fullest extent permitted by Massachusetts law,
against expenses, liabilities and losses reasonably incurred or suffered and
arising out of proceedings brought or threatened against them, by reason of
their status as directors, officers, employees or agents.

     Delaware law allows a corporation to include in its charter a provision
that limits or eliminates the personal liability of directors to the corporation
and its stockholders for monetary damages for breach of fiduciary duty as a
director. Delaware law does not, however, permit a corporation to limit or
eliminate the personal liability of a director for (i) any breach of the
director's duty of loyalty to the corporation or its stockholders, (ii) acts or
omissions not in good faith or which involve intentional misconduct or a knowing
violation of law, (iii) intentional or negligent payment of unlawful dividends
or stock repurchase or redemption, or (iv) any transaction from which the
director derived an improper personal benefit. Unlike Massachusetts law,
Delaware law does not specifically prohibit a corporation from limiting or
eliminating the personal liability of a director for any loans to any officer or
director of the corporation unless the director derived an improper personal
benefit from the loan. Brooks' charter limits its directors' liability to the
maximum extent permitted by Delaware law. Consequently, PRI's directors may be
liable to PRI and its stockholders for granting loans to directors and officers
under circumstances where Brooks' directors would not.

     Delaware law also provides that a corporation may indemnify any of its
directors, officers, employees and agents party to any action, suit or
proceeding by reason of the fact that he or she is or was a director, officer,
employee or agent of the corporation. Such indemnification can be made by the
corporation only as authorized in the specific case upon a determination that
such officer or director acted in good faith and in a manner he or she
reasonably believed to be in or not opposed to the best interests of the
corporation. This determination can be made by, among other things, a majority
vote of the directors or the stockholders. Brooks' charter and bylaws provide
for indemnification of directors, officers, employees and agents of Brooks to
the fullest extent permitted by Delaware law.

     Both Massachusetts and Delaware law allow for the indemnification of a
corporation's officers, directors, employees and agents. To the extent Delaware
law explicitly requires a corporation to take action to authorize
indemnification for each specific case, and Massachusetts law does not, there
may be a substantive difference in the ability of PRI and Brooks to provide
indemnification.

                                       106


INSPECTION RIGHTS

     Under Massachusetts law, a corporation's stockholders have the right for a
proper purpose to inspect the corporation's charter, bylaws, records of all
meetings of incorporators and stockholders, and stock and transfer records,
including the stockholder list. In addition, stockholders of a Massachusetts
corporation have a qualified right under certain circumstances to inspect other
books and records of the corporation.

     Under Delaware law, stockholders demonstrating a proper purpose have the
right to inspect a corporation's stock ledger, stockholder list, and other books
and records. The stockholders of Brooks generally have more extensive inspection
rights than stockholders of PRI.

DIVIDENDS AND REPURCHASE OF SHARES

     Under Massachusetts law, a corporation may pay dividends or repurchase its
own stock so long as the action is not taken when the corporation is insolvent,
does not render the corporation insolvent and does not violate the corporation's
charter. The PRI bylaws grant the board of directors the power, subject to the
Massachusetts Business Corporation Law and the PRI charter, to declare and pay
dividends on the shares of capital stock of PRI, which dividends may be paid
either in cash, securities of PRI or other property. Each share of PRI common
stock also carries with it an associated preferred stock purchase right
exercisable upon the occurrence of certain events.

     Delaware law permits a corporation to declare and pay dividends out of
surplus or, if there is no surplus, out of net profits for the fiscal year in
which the dividend is declared and/or for the preceding fiscal year as long as
the amount of capital of the corporation following the declaration and payment
of the dividend is not less than the aggregate amount of the capital represented
by the issued and outstanding stock of all classes having a preference upon the
distribution of assets. In addition, Delaware law generally provides that a
corporation may redeem or repurchase its shares only if such redemption or
repurchase would not impair the capital of the corporation. Notwithstanding the
foregoing, a Delaware corporation may redeem or repurchase shares having a
preference upon the distribution of any of its assets (or shares of common
stock, if there are no such shares of preferred stock) if such shares will be
retired upon acquisition (and provided that, after the reduction in capital made
in connection with such retirement of shares, the corporation's remaining assets
are sufficient to pay any debts for which no other provisions have been made).
The Brooks bylaws grant the board of directors the power, subject to Delaware
law and the Brooks charter, to declare dividends and pay such dividends from
Brooks' surplus and net profits for the current or preceding fiscal year, or as
otherwise permitted by law. Furthermore, the Brooks bylaws state that dividends
shall be payable upon such dates as the board of directors may designate. The
Brooks charter states that holders of each class of stock will share equally in
all dividends and distributions, without regard to class.

     Massachusetts law focuses on solvency in determining the permissibility of
a corporation's payment of dividends, whereas, Delaware law focuses on the
existence of a surplus. To the extent that each state law's focus differs, there
may be substantive differences in each corporation's ability to pay dividends.

STOCKHOLDER VOTING ON MERGERS AND SIMILAR TRANSACTIONS

     In the event of a merger, Massachusetts law provides that two-thirds of the
shares of each class of stock of the corporation, or, if the charter provides, a
lesser proportion but not less than a majority of each class of stock of the
corporation, are necessary for the approval of a merger. The PRI charter
provides that a majority vote of each class is sufficient to approve a merger.

     Under Delaware law, the affirmative vote of a majority of the outstanding
shares is generally required to authorize or approve any agreement providing for
a merger or consolidation. According to the Brooks charter, any stockholder vote
that is not recommended by a majority of the continuing directors, as defined in
the Brooks charter, must be approved by 80% of each class of capital stock
outstanding and entitled to vote thereon. Consequently, a greater vote of
stockholders would be required to approve a merger or consolidation that is not
approved by the continuing directors of Brooks than would be required in a

                                       107


similar transaction involving PRI. This super-majority vote provision could act
as an antitakeover deterrent. There is no similar provision in the PRI charter.

INTERESTED DIRECTOR TRANSACTIONS

     Under Massachusetts law, an interested transaction will be upheld in the
absence of fraud. The transaction must be both fair to the corporation and
entered into in good faith in order to be binding on the corporation. The PRI
bylaws allow PRI to enter into contracts with affiliated persons, such as
directors and officers. Absent fraud, no such contract will be invalidated if
the material facts regarding the person's relationship were disclosed to the
board of directors that authorized the contract.

     Under Delaware law, certain contracts or transactions in which one or more
of a corporation's directors has an interest are not void or voidable because of
that interest, as long as the transaction meets specified conditions, such as
obtaining the required approval and fulfilling the requirements of good faith
and full disclosure. Furthermore, Delaware law states that a contract or
transaction with an interested director will not be void or voidable if the
stockholders or disinterested directors approve the contract or transaction
after the material facts regarding the director's relationship or interest and
regarding the contract or transaction are disclosed, or if the contract or
transaction is fair to the corporation at the time it is approved. Furthermore,
Delaware law provides that if board approval is sought, the contract or
transaction must be approved by a majority of the disinterested directors even
if they comprise less than a quorum of the corporation's board of directors.

     The Brooks bylaws allow any director or officer to enter into any contract
of any kind with Brooks regardless of whether the director or officer derives
personal profits or otherwise benefits from the contract provided that:

     - the material facts regarding the interest are disclosed or known to the
       board or committee of directors thereof that authorizes the contract or
       agreement;

     - the material facts regarding the person's relationship or interest are
       disclosed or known to the stockholders entitled to vote thereon, and the
       contract is specifically approved in good faith by a vote of the
       stockholders; or

     - the contract or agreement is fair to the corporation at the time it is
       authorized, approved, or ratified by the board of directors, a committee
       thereof, or the stockholders.

     Any director of the corporation that is interested in any transaction may
still be counted in determining the existence of a quorum at any meeting of the
board of directors.

     Massachusetts requires that interested director transactions must be both
fair to the corporation and entered into in good faith. Both requirements must
be present. In contrast, Delaware law allows interested transactions as long as
disinterested directors approve the transaction after full disclosure or the
contract is fair to the corporation. Satisfaction of either test meets the
statutory requirement; it is not necessary to meet both tests. The requirement
of Massachusetts law for substantive fairness in all interested transactions may
make PRI's ability to engage in interested transactions with its directors more
restrictive than Brooks' ability to engage in interested transactions with its
directors.

DISSOLUTION BY THE BOARD OF DIRECTORS AND STOCKHOLDERS

     Under Massachusetts law, dissolution may be authorized either by the vote
of two-thirds of each class of a corporation's stock outstanding and entitled to
vote thereon or by compliance with the provisions of its charter. PRI's charter
provides that dissolution may be authorized by the vote of two-thirds of each
class of its outstanding stock. Under Delaware law, if a dissolution is
initially approved by a majority of the board of directors, then it must be
approved by a majority of the corporation's outstanding shares of capital stock
entitled to vote. However, if a majority of the board of directors does not
approve the proposal to dissolve, then the dissolution must be approved by the
written consent of all stockholders. The Brooks charter precludes its
stockholders from acting by written consent, and therefore the Brooks
stockholders would instead need to act by a vote.

                                       108


     Although a vote of two-thirds of the PRI stockholders is always necessary
to approve dissolution, the Brooks stockholders either need a majority vote if
the board approves the dissolution or a unanimous vote in favor by the
stockholders if the board does not approve it. Therefore, depending on the
action of the board of directors of Brooks, the stockholders of Brooks have a
greater or lesser voice than the PRI stockholders in determining whether to
dissolve.

AMENDMENT OF CHARTER DOCUMENTS

     Massachusetts law generally provides that a corporation's charter may be
amended by a vote of two-thirds of each class of stock outstanding and entitled
to vote, or if the charter so provides, by a vote of a lesser proportion but not
less than a majority of each class of stock outstanding and entitled to vote.
PRI's charter states that the board of directors is authorized to make, amend,
or repeal the bylaws in whole or in part, except the portions of the bylaws
relating to stockholder meetings, the board of directors, officers, and
amendments to the bylaws, which may only be amended with the affirmative vote of
the holders of 80% or more of the stock entitled to vote in an election of
directors. PRI's charter prohibits the amendment of its provision relating to
the amendment of PRI's bylaws without the affirmative vote of the holders of 80%
or more of the stock entitled to vote in an election of directors. PRI's bylaws
provide that except as otherwise provided in the PRI charter, the bylaws may be
amended by an affirmative vote of the holders of a majority of the shares of
each class of capital stock outstanding and entitled to vote.

     The Brooks charter provides that Brooks reserves the right to amend or
repeal any provision in the Brooks charter in the manner prescribed by Delaware
law. The Brooks charter provides that, in the absence of a specific provision,
amendments to the Brooks charter must generally be approved by either (1) a
majority of the continuing directors and a vote of the holders of a majority of
each class of stock entitled to vote thereon or (2) a vote of the holders of 80%
or more of each class of stock entitled to vote thereon, except that the
provision of the Brooks charter imposing supermajority voting controls in the
absence of a majority of the continuing directors may only be amended by the
vote of 80% or more of each class of stock entitled to vote thereon. Further,
under Delaware law, bylaws may be amended by stockholders; however, a
corporation may confer the power to amend bylaws upon the directors. The fact
that such power has been so conferred upon the directors does not divest the
stockholders of their power to amend the bylaws. The Brooks bylaws may be
amended by the vote of a majority of the board of directors except that the
directors may not amend the bylaws in a manner that would:

     - change the stockholder voting requirement for any action;

     - alter or abolish any preferential right or right of redemption;

     - permit the board of directors to take any action required to be taken by
       the stockholders; or

     - amend the provision of the bylaws governing amendments.

     The Brooks bylaws may be amended by the vote of a majority of all shares
entitled to vote, except that where the amendment would be to reduce any voting
requirement otherwise required by Delaware law or the Brooks charter or bylaws,
that amendment requires the vote that would have been required by Delaware law
or the Brooks charter or bylaws.

     Although amendments to the PRI charter generally must be approved by
two-thirds of the PRI stockholders, amendments to the Brooks charter will only
require the approval of a majority of the stockholders if the board of Brooks
has also approved the amendment. If the board of Brooks has not approved the
amendment, then the approval of 80% of the stockholders will be required.
Therefore, depending on the action of the board of directors of Brooks, the
stockholders of Brooks will have a greater or lesser voice than the PRI
stockholders in determining whether to approve an amendment to the corporation's
charter.

                                       109


                         BROOKS AND PRI PROPOSAL NO. 2

                    ADJOURNMENT OF THE BROOKS ANNUAL MEETING
                          AND THE PRI SPECIAL MEETING

     If at the PRI special meeting the number of shares of PRI common stock
voting in favor of the proposal to approve and adopt the merger agreement is
insufficient to approve the proposal under Massachusetts law, PRI's management
intends to move to adjourn the special meeting in order to enable PRI's
management to solicit additional proxies in favor of the proposal. In that
event, PRI will ask its stockholders to vote only upon the adjournment proposal
and the proposal to amend the PRI 2000 employee stock purchase plan, but not
upon the merger proposal.

     Similarly, if at the Brooks annual meeting the number of shares of Brooks
common stock voting in favor of either the proposal to issue shares of Brooks
common stock in the merger or the proposal to increase the number of authorized
shares of Brooks common stock is insufficient to approve the proposal under
Delaware law, Brooks' management intends to move to adjourn the annual meeting
in order to enable Brooks' management to solicit additional proxies in favor of
either or both proposals. In that event, Brooks will ask its stockholders to
vote only upon the proposals for which Brooks does not intend to seek additional
proxies in favor of such proposal.

     In the adjournment proposal, PRI and Brooks are asking their respective
stockholders to authorize the holder of any proxy solicited by the Brooks board
of directors or the PRI board of directors to vote in favor of granting
management the discretionary authority to adjourn the Brooks annual meeting or
the PRI special meeting, as the case may be, and any later adjournments of those
meetings, in each case to a date or dates not later than June 7, 2002, to enable
Brooks' management or PRI's management, or both, as the case may be, to solicit
additional proxies in favor of that party's merger proposal or Brooks' proposal
to increase its authorized common stock.

     If the stockholders of either company approve the adjournment proposal,
management could adjourn the meeting and any adjourned session of the meeting to
a date or dates not later than June 7, 2002 and use the additional time to
solicit additional proxies in favor of the party's merger proposal or Brooks'
proposal to increase its authorized common stock, as the case may be, including
the solicitation of proxies from stockholders that have previously voted against
the relevant proposal. Among other things, approval of the adjournment proposals
could mean that, even if Brooks or PRI have received proxies representing a
sufficient number of votes against any proposal to defeat it, Brooks' management
or PRI's management, or both, as the case may be, could adjourn the Brooks
annual meeting or the PRI special meeting, or both, as the case may be, without
a vote on the proposal for up to 30 days and seek during that period to convince
the holders of those shares to change their votes to votes in favor of the
proposal.

     Under PRI's bylaws, approval of the adjournment proposal will require a
majority of the votes properly cast on the proposal at the special meeting.
Under Brooks' bylaws, approval of the adjournment proposal will require a
majority of votes of holders of Brooks common stock present in person or
represented by proxy at the annual meeting.

     The PRI board of directors believes that if the number of shares of PRI
common stock voting in favor of the adoption of the merger proposal is
insufficient to approve the proposal, it is in the best interests of the PRI
stockholders to enable PRI's management, for a limited period of time, to
continue to seek to obtain a sufficient number of additional votes in favor of
the proposal to approve it.

     THE PRI BOARD OF DIRECTORS RECOMMENDS THAT PRI STOCKHOLDERS VOTE FOR THE
PROPOSAL TO GRANT PRI'S MANAGEMENT THE DISCRETIONARY AUTHORITY TO ADJOURN THE
SPECIAL MEETING TO A DATE OR DATES NOT LATER THAN JUNE 7, 2002.

     The Brooks board of directors believes that if the number of shares of
Brooks common stock voting in favor of the adoption of the merger proposal or
the proposal to increase its authorized common stock is insufficient to approve
the proposal, it is in the best interests of the Brooks stockholders to enable
Brooks'

                                       110


management, for a limited period of time, to continue to seek to obtain a
sufficient number of additional votes in favor of the proposal to approve it.

     THE BROOKS BOARD OF DIRECTORS RECOMMENDS THAT BROOKS STOCKHOLDERS VOTE FOR
THE PROPOSAL TO GRANT BROOKS' MANAGEMENT THE DISCRETIONARY AUTHORITY TO ADJOURN
THE ANNUAL MEETING TO A DATE OR DATES NOT LATER THAN JUNE 7, 2002.

                                       111


                             BROOKS PROPOSAL NO. 3

                          ELECTION OF BROOKS DIRECTORS

     At the Brooks annual meeting, five directors are to be elected to serve
until the 2003 annual meeting of stockholders and until their respective
successors have been duly elected and qualified. The board of directors has
nominated the persons listed below for election as directors.

     All five nominees are currently directors of Brooks. It is the intention of
the persons named as proxies to vote for the election of the nominees. In the
unanticipated event that any such nominee should be unable to serve, the persons
named as proxies will vote the proxy for such substitutes, if any, as the
present Brooks board of directors may designate. The nominees have not been
nominated pursuant to any arrangement or understanding with any person.

     The following table sets forth certain information with respect to the
nominees. When used below, positions held with Brooks include positions held
with Brooks' predecessors and subsidiaries.



NAME                      AGE                          POSITION                           DIRECTOR SINCE
----                      ---                          --------                           --------------
                                                                                 
Robert J. Therrien......  67    Director, President and Chief Executive Officer, Brooks        1989
Roger D.
  Emerick(1)(2).........  62    Director, Brooks                                               1993
Amin J. Khoury(1)(2)....  62    Director, Brooks                                               1994
Juergen Giessmann.......  55    Director, Brooks                                               1999
Joseph R. Martin(2).....  52    Director, Brooks                                               2001


---------------

(1) Member of the Brooks compensation committee.

(2) Member of the Brooks audit committee.

     Mr. Robert J. Therrien has been the president, chief executive officer and
a director of Brooks since its incorporation in 1989 when he initiated the
acquisition of the Brooks Automation Division of Aeronca Electronics, Inc. From
1983 to 1989, Mr. Therrien served as a consultant to Brooks and other firms in
the semiconductor industry. From 1972 until its sale to Schlumberger Industries
in 1983, Mr. Therrien cofounded and served as chairman and president of Accutest
Corporation, a semiconductor automatic test equipment company. Mr. Therrien is
currently a director of Accent Optical Technologies, Inc., a leading supplier of
optoelectronics and silicon process control systems, and All Wet Technologies,
Inc., a manufacturer of advanced wet processing systems for the wafer
fabrication industry.

     Mr. Roger D. Emerick has been a director of Brooks since October 1993. Mr.
Emerick served as a director of Lam Research Corporation, a semiconductor
equipment supplier, from 1982 until January 2001, and as chairman of the board
of directors of Lam from 1984 to 1997. Mr. Emerick served as president of Lam
from 1982 to 1989, and as its chief executive officer from 1982 to August 1997.
See "Certain Relationships and Related Transactions of Brooks -- Lam Research
Corporation." Mr. Emerick is also a director of Electroglas, Inc., a
manufacturer of automatic wafer probing equipment.

     Mr. Amin J. Khoury has been a director of Brooks since July 1994. Since
1987, Mr. Khoury has served as chairman of the board of B/E Aerospace, Inc., a
designer, manufacturer and marketer of airline interior furnishings. Mr. Khoury
is also chairman of the board of Applied Extrusion Technologies, Inc., a
manufacturer of oriented polypropylene films and extruded polymer nets. In
addition, Mr. Khoury is a member of the board of directors of Synthes-Stratec
Inc., the world's leading orthopedic trauma company.

     Mr. Juergen Giessmann has been a director of Brooks since October 1999. Mr.
Giessmann became a director pursuant to a stockholder agreement in connection
with Brooks' acquisition of the Infab division of Jenoptik AG. See "Certain
Relationships and Related Transactions of Brooks -- Jenoptik Stockholder
Agreement." Since 1981, Mr. Giessmann has served M+W Zander Holding AG, a
company active in the semiconductor and pharmaceutical markets, in a variety of
positions. In 1992 he became its managing director, in charge of sales and
marketing, human resources and purchasing divisions. Mr. Giessmann has also
served as a member of the Jenoptik AG board of management since M+W's
acquisition by Jenoptik

                                       112


AG in October 1994, and in this capacity has been responsible for the Jenoptik
Group's semiconductor activities. In January 2000, he was appointed chief
executive officer of M+W Zander Holdings AG.

     Mr. Joseph R. Martin has been a director of Brooks since June 2001. Mr.
Martin is executive vice president and chief financial officer of Fairchild
Semiconductor International, Inc., a global supplier of multi-market products
for electronic devices. He began his career at Fairchild in 1979 as manager of
financial planning and analysis for the Logic Division and subsequently held
various senior financial positions. Prior to becoming executive vice president
and chief financial officer of Fairchild, Mr. Martin was vice president of
finance, worldwide operations, for National Semiconductor, with responsibilities
for all operating divisions, manufacturing sites, and corporate financial
planning. See "Certain Relationships and Related Transactions of
Brooks -- Fairchild Semiconductor International, Inc." Previously, Mr. Martin
was senior vice president and chief financial officer of VTC Incorporated. In
addition to his position as a director of Brooks, Mr. Martin is also a member of
the board of directors of Fairchild Semiconductor International, Inc. and
ChipPAC, Incorporated.

VOTE REQUIRED AND BOARD OF DIRECTORS RECOMMENDATION

     Directors are elected by a plurality of votes cast.

     THE BROOKS BOARD OF DIRECTORS RECOMMENDS THAT THE BROOKS STOCKHOLDERS VOTE
FOR THE ELECTION OF THE NAMED NOMINEES.

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                             BROOKS PROPOSAL NO. 4

               AMENDMENT OF BROOKS' CERTIFICATE OF INCORPORATION

     If Proposal No. 1 is approved by the Brooks stockholders and the PRI
stockholders, Brooks intends to amend its certificate of incorporation to
increase the number of shares authorized for issuance thereunder from 43,000,000
to 100,000,000. A copy of a form of the amendment to the Brooks certificate of
incorporation to increase the number of authorized shares is attached to this
joint proxy statement/prospectus as Appendix G.

     By approving this proposal, the Brooks stockholders will authorize the
amendment of Brooks' certificate of incorporation to effect the increase in
authorized shares. The amendment to the certificate of incorporation will take
the following form:

     "Article Fourth will be deleted in it entirety and replaced as follows:
'The total number of shares of all classes of stock which the Corporation shall
have authority to issue is (i) 100,000,000 shares of common stock, $.01 par
value per share (the "Common Stock"), and (ii) 1,000,000 shares of Preferred
Stock, $.01 par value per share (the "Preferred Stock").' "

     Even if this Proposal No. 4 is approved, the amendment to Brooks'
certificate of incorporation will only take effect if the merger is completed.

     Under Delaware law, Brooks may only issue shares of its common stock to the
extent such shares have been authorized for issuance under its certificate of
incorporation. Brooks' certificate of incorporation currently authorizes the
issuance by Brooks of up to 43,000,000 shares of common stock. However, as of
March 31, 2002, 20,268,460 shares of Brooks common stock were issued and
outstanding, 2,491,813 shares of Brooks common stock were reserved for issuance
upon conversions of Brooks' 4.75% convertible subordinated notes and 6,674,952
shares of Brooks common stock were reserved for issuance under Brooks' stock
plans. Based on PRI's capitalization as of March 31, 2002, approximately
13,528,000 shares of Brooks common stock are proposed to be issued to holders of
shares of PRI common stock in the merger, and, in addition, approximately
3,278,605 shares of Brooks common stock must be reserved effective as of the
closing of the merger for issuance upon exercise of options, warrants and other
rights to purchase shares of PRI common stock, which will be assumed by Brooks
in the merger and will become options, warrants and rights to purchase shares of
Brooks common stock. As a result, if the merger is completed and all the Brooks
proposals are approved, based on Brooks' and PRI's capitalization as of March
31, 2002, there would be:

     - 33,796,460 shares of Brooks common stock issued and outstanding;

     - 2,491,813 shares of Brooks common stock reserved for issuance upon
       conversions of Brooks' 4.75% convertible subordinated notes; and

     - 16,203,557 shares of Brooks common stock reserved for issuance under
       Brooks' stock plans.

     Because the total outstanding and reserved shares of Brooks common stock of
52,491,830 after the merger would exceed the current authorized limit, the
purpose of the proposed amendment to the certificate of incorporation is to
authorize additional shares of Brooks common stock which will be available for
issuance in the merger, for a reserve for issuance upon exercise of the options,
warrants and other rights assumed in the merger and also in the event the Brooks
board of directors determines that it is necessary or appropriate to issue
additional shares in connection with a stock dividend, additional equity
incentives to employees and officers, or for financings, acquisitions or other
corporate purposes. The availability of additional shares of Brooks common stock
is particularly important in the event that Brooks needs to undertake any of the
foregoing actions on an expedited basis and wishes to avoid the time and expense
of seeking stockholder approval in connection with the contemplated issuance of
Brooks common stock. Brooks has no present agreement or arrangement to issue any
of the additional authorized shares, other than in connection with the merger
and the exercise of options, warrants and other rights assumed in the merger.
Even if this Proposal No. 4 is approved, the amendment to the certificate of
incorporation will only take effect if the merger is completed.
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     This increase in authorized common stock will not have any immediate effect
on the rights of existing Brooks stockholders. However, the Brooks board will
have the authority to issue Brooks common stock without requiring future
stockholder approval of such issuance, except as may be required by applicable
law or the rules of the Nasdaq Stock Market. To the extent that additional
shares of Brooks common stock are issued in the future, they may decrease the
existing stockholders' percentage equity ownership and, depending on the price
at which they are issued, could be dilutive to the existing stockholders.

POSSIBLE EFFECTS OF THE INCREASE IN AUTHORIZED SHARES -- ANTITAKEOVER
CONSIDERATIONS

     The increase in the authorized number of shares of Brooks common stock and
the subsequent issuance of shares could have the effect of delaying or
preventing a change in control of Brooks without further action by the Brooks
stockholders. Shares of authorized and unissued Brooks common stock could,
within the limits imposed by applicable law, be issued in one or more
transactions which make a change in control of Brooks more difficult, and
therefore less likely. Any such issuance of additional shares of Brooks common
stock could have the effect of diluting the earnings per share and book value
per share of outstanding shares of Brooks common stock, and such additional
shares could be used to dilute the stock ownership or voting rights of a person
seeking to obtain control of Brooks. The board of directors is not currently
aware of any attempt to acquire Brooks. While it may be deemed to have potential
antitakeover effects, the proposed amendment to increase the authorized common
stock is not prompted by any specific takeover threat currently perceived by
Brooks management.

     Brooks' certificate of incorporation includes several other provisions
which may have the effect of preventing changes in its management. These
provisions may make an unfriendly tender offer, proxy contest, merger or other
change in control of Brooks more difficult. These provisions are intended to
enhance the likelihood of continuity and stability in the composition of its
board of directors and in the policies formulated by its board of directors and
to discourage certain types of transactions that may involve a change in
control. These provisions are also designed to reduce Brooks' vulnerability to
unsolicited acquisition proposals and to discourage certain tactics that may be
used in proxy fights. These provisions, however, could have the effect of
discouraging others from making tender offers for shares of Brooks common stock
and, as a consequence, they also may inhibit fluctuations in the market price of
the shares of Brooks common stock which could result from actual or rumored
takeover attempts.

     Brooks' board of directors has the authority to issue preferred stock in
one or more series, and to fix the rights, preferences, privileges and
restrictions thereof, including dividend rights, dividend rates, conversion
rights, voting rights, terms of redemption, redemption prices, liquidation
preferences and the number of shares constituting any series or the designation
of such series, without further vote or action by the stockholders. If Brooks
issues preferred stock, the issuance may have the effect of delaying, deferring
or preventing a change in control of Brooks without further action by the
stockholders, and may adversely affect the voting and other rights of the
holders of Brooks common stock. If Brooks issues preferred stock with voting and
conversion rights, the voting power of the holders of Brooks common stock may be
adversely affected. Holders of Brooks common stock may lose voting control to
the holders of Brooks preferred stock. Currently the Brooks board of directors
has no plan to issue any preferred stock other than the issuance of one Brooks
special voting share in connection with the merger. See "Brooks and PRI Proposal
No. 1 -- Approval of Adoption of the Merger Agreement and the
Merger -- Treatment of PRI Canada Exchangeable Shares."

     Brooks' certificate of incorporation contains a so-called "anti-greenmail"
provision. The provision is intended to discourage speculators who accumulate
beneficial ownership of a significant block of stock of a company and then,
under the threat of making a tender offer or instigating a proxy contest or some
other corporate disruption, succeed in extracting from Brooks a premium price to
repurchase the shares acquired by the speculator. This tactic has become known
as greenmail. The anti-greenmail provision prohibits Brooks from purchasing any
shares of its common stock from a related person, who has beneficially owned
such common stock or rights to purchase such common stock for less than two
years prior to the date of such purchase, at a per share price in excess of the
fair market value at the time of the purchase unless the purchase is approved by
the holders of two-thirds of the outstanding shares of Brooks common stock,

                                       115


excluding any votes cast by the related person. The term "related person" means
any person who acquires more than 5% of the Brooks common stock. Stockholder
approval is not required for such purchases when the offer is made available on
the same terms to all holders of shares of Brooks common stock or when the
purchases are effected on the open market.

     Brooks' certificate of incorporation also provides that all stockholder
action must be effected at a duly called meeting and not by written consent, and
that certain stockholder proposals may only be approved by the holders of 80% or
more of the shares of stock entitled to vote on the proposal. In addition,
Brooks' bylaws do not permit Brooks' stockholders to call a special meeting of
stockholders.

  RIGHTS AGREEMENT

     Brooks' board of directors has adopted a rights plan. As a result, Brooks
issued one purchase right for each outstanding share of its common stock. One
purchase right will be issued for each additional share of common stock that
Brooks issues. In general, the rights become exercisable on the earlier of: (i)
the tenth day after the public announcement or disclosure that there is an
"acquiring person" (which is a person or group that, without the prior approval
of Brooks' board of directors, acquires 15% or more of its outstanding common
stock), or (ii) the tenth business day, or such later date determined by action
of the continuing directors, after a person or group, without the prior approval
of Brooks' board of directors, commences or announces a tender or exchange offer
which would result in such person or group becoming an acquiring person.
Initially, each right that becomes exercisable entitles the registered holder to
purchase one one-thousandth of a share of Brooks' junior participating preferred
stock at a purchase price of $135 per one-thousandth of a share, subject to
adjustment. When there is an acquiring person, the rights will entitle each
holder to purchase, for $135, that number of shares of Brooks common stock
having a market value of $270. However, the rights held by an acquiring person
shall be void and nontransferable, and any holder, purported transferee or
nominee of these rights will lack any right to exercise or transfer these
rights. Under certain circumstances, after there is an acquiring person, Brooks'
board of directors may exchange all or part of the then outstanding and
exercisable rights at a rate of one share of Brooks common stock per right.

     If, after the rights become exercisable, Brooks were to be acquired through
a merger or other business combination transaction or 50% or more of its assets
or earning power were sold, each right would permit the holder of such right to
purchase, for the purchase price, common stock of the surviving company having a
market value of twice the purchase price.

     The rights expire on July 31, 2007, unless earlier redeemed or exchanged by
Brooks. The purchase price payable and the shares of preferred stock issuable
upon exercise of the rights are subject to adjustment as described in the rights
agreement. In addition, Brooks' board of directors retains the authority to
redeem, at $0.001 per right, the rights at any time before there is an acquiring
person.

     The terms of the rights may be amended by Brooks' board of directors
without the consent of the holders of the rights, except that after any person
becomes an acquiring person, no such amendment may adversely affect the
interests of the holders of the rights (other than the acquiring person and its
affiliates and associates).

     Stockholders of Brooks do not now have preemptive rights to subscribe for
or purchase additional shares of Brooks common stock, and the stockholders will
have no preemptive rights to subscribe for or purchase any of the additional
shares authorized by the proposed amendment.

  SECTION 203 OF THE DELAWARE GENERAL CORPORATION LAW

     Brooks is a Delaware corporation and as such it is subject to the
provisions of Section 203 of the Delaware General Corporation Law. See
"Comparison of Stockholder Rights -- Stockholder Approval of Certain Business
Combinations."

                                       116


VOTE REQUIRED AND BOARD OF DIRECTORS RECOMMENDATION

     The proposal to amend Brooks' certificate of incorporation requires the
affirmative vote of the holders of a majority of all outstanding shares of
Brooks common stock.

     THE BROOKS BOARD OF DIRECTORS UNANIMOUSLY RECOMMENDS THAT BROOKS
STOCKHOLDERS VOTE FOR THE PROPOSED AMENDMENT TO BROOKS' CERTIFICATE OF
INCORPORATION.

                                       117


                             BROOKS PROPOSAL NO. 5

           AMENDMENT OF THE BROOKS 1995 EMPLOYEE STOCK PURCHASE PLAN

     Brooks' 1995 employee stock purchase plan is intended to provide Brooks
employees with additional incentives by permitting them to acquire a proprietary
interest in Brooks through the purchase of shares of Brooks common stock.

     If Proposal No. 1 is approved, the Brooks board of directors has approved
an amendment to the stock purchase plan, subject to stockholder approval, to
increase the number of shares of Brooks common stock available for purchase from
750,000 shares to 1,500,000 shares. If the amendment is approved, Section 3 of
the stock purchase plan will be amended to read in its entirety as follows:

          "The stock subject to the options granted hereunder shall be shares of
     the Company's authorized but unissued Common Stock or shares of Common
     Stock reacquired by the Company, including shares purchased in the open
     market. The aggregate number of shares which may be issued pursuant to the
     Plan is 1,500,000, subject to increase or decrease by reason of stock
     split-ups, reclassifications, stock dividends, changes in par value and the
     like. If the number of shares of Common Stock reserved and available for
     any Offering Period (as defined herein) is insufficient to satisfy all
     purchase requirements for that Offering Period, the reserved and available
     shares for that Offering Period shall be apportioned among participating
     employees in proportion to their options." (Change shown in italics.)

STOCK PURCHASE PLAN

     The Brooks stock purchase plan provides that all Brooks employees
(including officers and directors) who work more than twenty hours per week and
more than five months in any calendar year on or before the first day of the
applicable offering period are eligible to participate. However, no employee who
holds five percent or more of the outstanding shares of Brooks common stock is
eligible to participate. Further, no employee may be granted an option pursuant
to which the employee's right to purchase Brooks common stock under the Brooks
stock purchase plan accrues at a rate which exceeds $25,000 of fair market value
of such stock per year. Approximately 1,800 Brooks employees are currently
eligible to participate in the Brooks stock purchase plan. The Brooks stock
purchase plan is administered by the compensation committee of the Brooks board
of directors.

     Eligible Brooks employees elect to participate in the Brooks stock purchase
plan by giving notice to Brooks and instructing Brooks to withhold a specified
dollar amount from the employee's salary during the following six-month period.
The periods run from January 1 to June 30 and from July 1 to December 31, and
each is referred to as an offering period. On the last business day of that
offering period, the amount withheld is used to purchase Brooks common stock at
an exercise price equal to 85% of the fair market value of the Brooks common
stock on either the first or last day of the offering period, whichever is less.
For this purpose, fair market value is the average of the high and low sales
prices as reported on the Nasdaq National Market System. If no shares are traded
on those days, the average of the fair market values on the immediately
preceding and next following business day on which shares are traded is used.
Brooks technically grants an option to each participant, on the first day of the
offering period, to purchase, on the last day of the offering period, at the
exercise price, that number of shares of Brooks common stock that his or her
accumulated payroll deductions on the last day of the offering period will pay
for at such price. The option is automatically deemed to be exercised if the
employee is still a participant on the last day of the offering period. A
person's participation in the Brooks stock purchase plan ends automatically upon
termination of that person's employment with Brooks.

     A participating employee may authorize a payroll deduction of any even
dollar amount, equal to not more than ten percent of his or her base pay,
including applicable commissions, but not less than $5.00 per payroll period.
Deductions from any employee's compensation may not be increased or decreased
during an offering period. Under the Brooks stock purchase plan, the number of
shares of Brooks common stock purchased at the end of any offering period may
not be more than 1,500 shares.

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     An employee may withdraw from the Brooks stock purchase plan, and withdraw
all of the payroll deductions credited to his or her account under the Brooks
stock purchase plan, at any time prior to the last business day of any offering
period. Upon such a withdrawal, Brook will refund without interest the entire
remaining balance of the employee's deductions.

     The maximum number of shares of Brooks common stock which may be purchased
by employees under the Brooks stock purchase plan is 750,000 shares, subject to
adjustments for stock splits, stock dividends and similar transactions. Such
shares may be authorized but unissued shares of Brooks common stock or shares of
Brooks common stock reacquired by Brooks, including shares purchased in the open
market. As of March 31, 2002, 338,779 shares of Brooks common stock have been
purchased under the Brooks stock purchase plan and 411,221 shares remain
available for purchase. As described above, the Brooks board of directors has
approved an amendment to the stock purchase plan, subject to stockholder
approval, to increase the number of shares of Brooks common stock purchaseable
under the plan from 750,000 shares to 1,500,000 shares.

     The Brooks stock purchase plan may be amended by the Brooks board of
directors from time to time in any respect; provided, however, that no amendment
shall be effective without stockholder approval if the amendment would
materially increase the number of shares of Brooks common stock which may be
issued under the Brooks stock purchase plan, materially increase the benefits
accruing to participants in the Brooks stock purchase plan, or materially modify
the requirements as to eligibility for participation in the Brooks stock
purchase plan.

     The Brooks stock purchase plan is intended to qualify as an "employee stock
purchase plan" under Section 423 of the Internal Revenue Code. An employee will
not recognize income on the grant or exercise of an option under the Brooks
stock purchase plan. In addition, Brooks will not have a deductible compensation
expense as a result of such grant or exercise unless there is a premature
disposition, as described in the next paragraph. If the employee does not
dispose of the shares of Brooks common stock for at least two years from the
grant of an option under the Brooks stock purchase plan, or in the event of his
or her death, the employee will realize ordinary income upon disposition
(including by sale, gift or death) in an amount equal to the lesser of: (i) the
excess of the fair market value of the Brooks common stock at the time of
disposition over the exercise price, or (ii) the excess of the fair market value
of the Brooks common stock on the first day of the offering period over the
option exercise price. The sum of this amount of income realized plus the option
exercise price paid will be the employee's tax basis in the Brooks common stock.
An employee will recognize long-term capital gain (or loss) to the extent the
sales proceeds exceed (or are exceeded by) the tax basis. If the sale price is
less than the price paid, the employee will not recognize any ordinary income,
and any loss that he or she suffers on the sale will be a capital loss.

     If shares purchased under the Brooks stock purchase plan are sold by an
employee within two years after the option is granted, then the employee will
realize ordinary income in the year of disposition in an amount equal to the
excess of the fair market value of the shares on the date of exercise over the
exercise price (or, if less, the excess of the sales proceeds realized on
disposition of the shares over the option exercise price). Any remaining gain
will be treated as capital gain, which may be long or short term, depending on
the time that the shares are held. If an employee does recognize ordinary income
as a result of a premature disposition, a compensation deduction is allowed to
Brooks in an equal amount, provided Brooks timely provides the recipient and the
Internal Revenue Service with a form W-2 or W-2c, whichever is applicable.

     The foregoing summary of the effect of federal income taxation upon the
participant and Brooks with respect to the purchase of shares of Brooks common
stock under the Brooks stock purchase plan does not purport to be complete, and
reference should be made to the applicable provisions of the Internal Revenue
Code. The foregoing federal income tax summary is based upon provisions of the
Internal Revenue Code as in effect on the date hereof, regulations promulgated
and proposed thereunder, administrative rulings and pronouncements by the
Internal Revenue Service, and judicial decisions, all of which are subject to

                                       119


change (perhaps with retroactive effect). In addition, this summary does not
discuss the provisions of the income tax laws of any municipality, state, or
foreign country in which the participant may reside.

VOTE REQUIRED AND BOARD OF DIRECTORS RECOMMENDATION

     The proposal to amend the Brooks 1995 employee stock purchase plan requires
the affirmative vote of a majority of the votes of holders of Brooks common
stock present in person or by proxy at the annual meeting.

     THE BROOKS BOARD OF DIRECTORS RECOMMENDS THAT BROOKS STOCKHOLDERS VOTE FOR
THE PROPOSED AMENDMENT OF THE BROOKS 1995 EMPLOYEE STOCK PURCHASE PLAN.

                                       120


                             BROOKS PROPOSAL NO. 6

      AMENDMENT OF THE BROOKS 1993 NONEMPLOYEE DIRECTOR STOCK OPTION PLAN

     The purpose of the Brooks 1993 nonemployee director stock option plan is to
attract and retain the services of experienced and knowledgeable independent
directors of Brooks for the benefit of Brooks and its stockholders and to
provide additional incentives for such independent directors to continue to work
for the best interests of Brooks and its stockholders through continuing
ownership of Brooks common stock.

     The Brooks board of directors has approved the following amendments to the
directors plan, subject to stockholder approval:

     - If Proposal No. 1 above IS approved, the directors plan will be amended
       to increase the number of shares of Brooks common stock reserved for
       issuance under the plan from 190,000 to 690,000, and to increase the
       initial and annual grants to new nonemployee directors under the
       directors plan from 10,000 and 5,000 shares of Brooks common stock to
       25,000 and 10,000 shares of Brooks common stock, respectively.
       Nonemployee directors currently serving on the Brooks board will receive
       an option to purchase 15,000 shares upon the approval of this amendment
       by the stockholders. When Brooks appoints Mitchell G. Tyson and Kenneth
       M. Thompson to its board of directors in accordance with the merger
       agreement, Mr. Thompson, as a nonemployee director, will receive an
       option to purchase 25,000 shares of Brooks common stock. Annual option
       grants to current nonemployee directors under the directors plan will
       increase from 5,000 shares of Brooks common stock to 10,000 shares of
       Brooks common stock. If Proposal No. 1 and Proposal No. 7 are both
       approved, then Sections 3 and 5 of the directors plan will read in their
       entirety as follows:

        "3.  Stock Subject to the Plan.  The aggregate number of Shares that may
        be issued and sold under the Plan shall be 690,000 shares. The Shares to
        be issued upon exercise of Options granted under this Plan shall be made
        available, at the discretion of the Board of Directors, from (i)
        treasury Shares and/or Shares reacquired by the Corporation for such
        purposes, including Shares purchased in the open market, (ii) authorized
        but unissued Shares, and (iii) Shares previously reserved for issuance
        upon exercise of Options which have expired or been terminated. If any
        Option granted under this Plan shall expire or terminate for any reason
        without having been exercised in full, the unpurchased Shares covered
        thereby shall become available for grant as additional Options under the
        Plan so long as it shall remain in effect." (Changes shown in italics.)

        "5.  Eligibility; Grant of Options.  Each director on the Board who is
        not an employee of the Company shall be granted an Option to purchase
        15,000 shares of Common Stock on the date the stockholders approve the
        Plan as amended through December 13, 2001 (the "Existing Directors").
        Thereafter, initial Options will be granted only to a director who is
        first elected to the Board after the date the Plan as amended through
        December 13, 2001 is adopted by the stockholders and who is not then an
        employee of the Corporation (the "New Directors"). Each New Director
        will be granted an Option to purchase 25,000 shares of Common Stock
        under the Plan as of the date he or she is first elected as a director
        (the "Initial Option"). Thereafter, each New Director and each Existing
        Director (collectively, with the New Directors, the "Eligible
        Directors") shall be granted a new Option for 10,000 Shares on July 1st
        of each year provided such directors are then on the Board and are not
        employees of the Company." (Changes shown in italics.)

     - If Proposal No. 1 above IS NOT approved, the directors plan will be
       amended to increase the number of shares reserved for issuance thereunder
       from 190,000 to 490,000. No change will be made to the size of the
       initial and annual grants to nonemployee directors under the directors
       plan. If Proposal No. 1 is not approved but Proposal No. 6 is approved,
       then Section 3 of the directors plan will read in its entirety as
       follows:

        "3.  Stock Subject to the Plan.  The aggregate number of Shares that may
        be issued and sold under the Plan shall be 490,000 shares. The Shares to
        be issued upon exercise of Options granted

                                       121


        under this Plan shall be made available, at the discretion of the Board
        of Directors, from (i) treasury Shares and/or Shares reacquired by the
        Corporation for such purposes, including Shares purchased in the open
        market, (ii) authorized but unissued Shares, and (iii) Shares previously
        reserved for issuance upon exercise of Options which have expired or
        been terminated. If any Option granted under this Plan shall expire or
        terminate for any reason without having been exercised in full, the
        unpurchased Shares covered thereby shall become available for grant as
        additional Options under the Plan so long as it shall remain in effect."
        (Change shown in italics.)

DIRECTORS PLAN

     Each director who is not an employee of Brooks or any of its subsidiaries
is eligible to receive options under the directors plan. Of the current
directors, Messrs. Emerick, Khoury, Giessmann and Martin are eligible directors.
Under the directors plan, each eligible director receives an automatic grant of
an option to purchase 10,000 shares of Brooks common stock upon becoming a
director of Brooks and an option to purchase 5,000 shares on July 1 each year
thereafter. Options granted under the directors plan become exercisable in 20%
increments over a five year period for each year that the director remains
affiliated with Brooks. A total of 190,000 shares of Brooks common stock were
reserved for issuance under the directors plan. Of these shares, options on
96,000 shares have been granted and are outstanding and 41,000 shares remain
available for grant as of March 31, 2002.

     The exercise price for all options granted under the directors plan is the
fair market value of the Brooks common stock on the date of grant, but in no
event less than the par value of the common stock. To assist an optionee in the
acquisition of shares of Brooks common stock pursuant to the exercise of an
option granted under the directors plan, the exercise price may be paid (i) in
cash, (ii) by delivery of shares of Brooks common stock having a fair market
value on the date of exercise equal to the purchase price, or (iii) any
combination of cash and shares of Brooks common stock.

     Shares of Brooks common stock issued under the directors plan may include
treasury shares, authorized but unissued shares and shares previously reserved
for issuance upon exercise of options which have expired or terminated. Shares
subject to an option that ceases to be exercisable for any reason will be
available for subsequent option grants. The directors plan terminates and no
further options may be issued under the plan after April 1, 2004.

     No option under the directors plan may be exercised subsequent to ten years
from the date of grant. If an eligible director ceases to be a director of
Brooks for any reason, all options held by that director that are not then
exercisable terminate. Options generally may not be exercised after 30 days
following the date the holder ceases to be a director of Brooks, except that in
the event of death or permanent disability of the optionholder, the portion of
the option then exercisable may be exercised by the holder or his estate for a
period of up to one year after the date of such death or permanent disability.
Options granted under the directors plan may not be assigned or transferred
except by will or the laws of descent and distribution.

     The directors plan may be amended by the Brooks board of directors or any
committee to which such authority has been delegated by the board, at any time,
in whole or in part, provided however, that so long as there is a legal
requirement for stockholder approval of a plan and certain amendments thereto,
any such amendment which (i) materially increases the number of shares which may
be subject to options granted under the directors plan, (ii) materially
increases the benefits accruing to participants in the directors plan or (iii)
materially modifies the requirement for eligibility to participate in the
directors plan, shall be subject to stockholder approval, to the extent required
by such laws; and provided further that the directors plan may not be modified
more often than once every six months to materially modify (i) the requirements
for eligibility under the directors plan, (ii) the timing of the grants of
options under the directors plan or (iii) the number of shares subject to
options to be granted under the directors plan. No amendment, suspension or
termination of the directors plan, except as described in the directors plan,
may adversely affect the rights of an option holder under the plan without the
holder's consent.

                                       122


     The following table sets forth the amounts that have been received by or
allocated to each of the following under the directors plan.

                               NEW PLAN BENEFITS
                  1993 NONEMPLOYEE DIRECTOR STOCK OPTION PLAN



                                                                                   NUMBER OF SHARES
NAME                                                        DOLLAR VALUE($)(1)   SUBJECT TO OPTIONS(2)
----                                                        ------------------   ---------------------
                                                                           
Robert J. Therrien, chief executive officer and
  president...............................................     Not eligible                  --
Charles M. McKenna, executive vice president, automation
  systems division........................................     Not eligible                  --
Michael W. Pippins, senior vice president, factory
  interface division......................................     Not eligible                  --
Ellen B. Richstone, senior vice president, finance and
  administration and chief financial officer..............     Not eligible                  --
Jeffrey A. Cassis, senior vice president, factory
  automation software division............................     Not eligible                  --
James A. Pelusi, former assistant to the president........     Not eligible                  --
David R. Beaulieu, former vice president and general
  manager, vacuum business unit...........................     Not eligible                  --
Current executive officers as a group.....................     Not eligible                  --
Current nonemployee directors as a group..................                0             100,000(3)
All employees who are not executive officers as a group...     Not eligible                  --


---------------

(1) Based on the difference between the market value of the underlying shares on
    the date of grant and the exercise price of the options. This valuation does
    not take into account any appreciation in market value of the underlying
    shares which may occur over the term of the options. The closing price of
    Brooks common stock on April 8, 2002 was $37.40.

(2) Options may be granted under the directors plan only to nonemployee
    directors.

(3) Representing options to purchase a total of 60,000 shares that would be
    granted to Brooks' four nonemployee directors on the date the merger is
    completed and options to purchase a total of 40,000 shares that would be
    granted pursuant to the July annual grant to Brooks' four nonemployee
    directors provided that they remain directors of Brooks through July 1,
    2002.

UNITED STATES FEDERAL INCOME TAX CONSEQUENCES

Please see "United States Federal Income Tax Consequences of the Brooks 1993
Nonemployee Directors Plan and 2000 Combination Stock Option Plan" on page 126
for a general discussion of the United States federal income tax consequences of
options granted under the directors plan.

VOTE REQUIRED AND BOARD OF DIRECTORS RECOMMENDATION

     The proposal to amend the Brooks 1993 nonemployee director stock option
plan requires the affirmative vote of a majority of the votes of holders of the
Brooks common stock present in person or by proxy at the annual meeting.

     THE BROOKS BOARD OF DIRECTORS RECOMMENDS THAT BROOKS STOCKHOLDERS VOTE FOR
THE PROPOSED AMENDMENT OF THE BROOKS 1993 NONEMPLOYEE DIRECTOR STOCK OPTION
PLAN.

                                       123


                             BROOKS PROPOSAL NO. 7

           AMENDMENT OF THE BROOKS 2000 COMBINATION STOCK OPTION PLAN

     Brooks' 2000 combination stock option plan, or the 2000 plan, is intended
to attract and retain employees and to provide an incentive for them to assist
Brooks to achieve long-range and performance goals and to enable them to
participate in long-term growth of Brooks. Under the 2000 plan, Brooks may grant
incentive stock options intended to qualify under Section 422 of the Internal
Revenue Code and options that do not qualify as incentive stock options. All
employees of Brooks or any affiliate of Brooks capable of contributing
significantly to the successful performance of Brooks are eligible to
participate in the 2000 plan, which was adopted by the Brooks stockholders on
February 24, 2000.

     The Brooks board of directors has approved the following amendments to the
2000 plan, subject to stockholder approval:

     - If Proposal No. 1 above IS approved, the 2000 plan will be amended to
       increase the number of shares authorized for issuance thereunder from
       1,000,000 to 6,000,000. If the amendment is approved, Section 3 of the
       2000 plan would read in its entirety as follows:

       "Subject to adjustment under Section 9, the maximum aggregate number of
       shares of the Company's Common Stock that may be issued under this Plan
       shall be 6,000,000 shares. Subject to adjustment under Section 9, the
       maximum aggregate number of shares of the Company's Common Stock for
       which grants may be made to any employee during any fiscal year shall be
       500,000 shares." (Change shown in italics.)

     - If Proposal No. 1 above IS NOT approved, the 2000 plan will be amended to
       increase the number of shares authorized for issuance thereunder from
       1,000,000 to 3,000,000. If the amendment is approved, Section 3 of the
       2000 plan would read in its entirety as follows:

       "Subject to adjustment under Section 9, the maximum aggregate number of
       shares of the Company's Common Stock that may be issued under this Plan
       shall be 3,000,000 shares. Subject to adjustment under Section 9, the
       maximum aggregate number of shares of the Company's Common Stock for
       which grants may be made to any employee during any fiscal year shall be
       500,000 shares." (Change shown in italics.)

2000 PLAN

     The 2000 plan is administered by the Brooks board of directors, or if the
board determines, by a committee consisting of at least two nonemployee
directors. The committee has delegated to Mr. Therrien, as a committee of one
director, authority to grant awards of not more than 9,000 shares of Brooks
common stock in the aggregate under all Brooks plans to any single employee
(other than an executive officer) during any single fiscal year. The committee
serves at the pleasure of the board which can, at its sole discretion, discharge
any member of the committee, appoint new members in substitution for those
previously appointed, and fill vacancies regardless of how they are caused. The
board has the authority to adopt, alter and repeal administrative rules,
guidelines and practices governing the operation of the 2000 plan and to
interpret provisions of the 2000 plan. The board may delegate to the committee,
to the extent permitted by applicable law, the power to make awards to
participants and all determinations under the 2000 plan with respect thereto.

     The maximum aggregate number of shares of Brooks common stock available for
issuance under the 2000 plan is 1,000,000 shares. Of these shares, as of March
31, 2002, options to purchase 784,359 shares have been granted and are
outstanding and 207,441 shares remain available for grant. The shares of common
stock available for issuance under the 2000 plan are subject to adjustment for
any stock dividend, recapitalization, stock split, stock combination or certain
other corporate reorganizations. Shares issued may consist in whole or in part
of authorized but unissued shares or treasury shares. Shares subject to an award
that expires or is terminated unexercised or is forfeited for any reason or
settled in a manner

                                       124


that results in fewer shares outstanding than were initially awarded will again
be available for award under the 2000 plan.

     Subject to the provisions of the 2000 plan, the board may award incentive
stock options and nonqualified stock options and determine the number of shares
to be covered by each option, the exercise price, and the conditions and
limitations applicable to the exercise of the option. Each option shall be
exercisable at such times and subject to such terms and conditions as the board
may specify in the applicable award or thereafter.

     The terms and conditions of incentive stock options shall be subject to and
must comply with section 422 of the Internal Revenue Code and any regulations
thereunder. No incentive stock option granted under the 2000 plan may be granted
more than ten years after the effective date of the 2000 plan, and no such grant
may be exercisable more than seven years after the date of grant (five years
after the date of grant for incentive stock options granted to holders of more
than ten percent of the common stock). Incentive stock options shall be granted
only to employees of Brooks and shall be transferable by the optionee only by
the laws of descent and distribution, and shall be exercisable only by the
employee during his or her lifetime. No incentive stock option granted pursuant
to the 2000 plan may be exercised more than three months after the option holder
ceases to be an employee of Brooks, except that in the event of death or
permanent and total disability of the option holder, the option may be exercised
by the holder or his estate for a period of up to one year after the date of
such death or permanent and total disability.

     The exercise price for nonqualified stock options and incentive stock
options must at least equal the fair market value of the Brooks common stock on
the date of grant. Incentive stock options may be granted to the holders of more
than ten percent of the Brooks common stock only at an exercise price of at
least 110% of the fair market value of the Brooks common stock on the date of
the grant.

     Each option shall be evidenced by a written document delivered to the
participant specifying the terms and conditions thereof and containing such
other terms and conditions consistent with the provisions of the 2000 plan as
the Brooks board of directors considers necessary or advisable. The terms of
each type of option need not be identical, and the board need not treat
participants uniformly. The board may amend, modify or terminate any outstanding
option, including substituting another option therefor, changing the date of
exercise and converting an incentive stock option to a nonqualified stock
option, provided that the participant's consent to such action shall be required
unless the board determines that the action would not materially and adversely
affect the participant.

     The Brooks board of directors will determine whether awards granted
pursuant to the 2000 plan are settled in whole or in part in cash, common stock,
other securities of Brooks, other property or such other methods as the board of
directors may deem appropriate. The board may permit a participant to defer all
or any portion of a payment under the 2000 plan. In the board's discretion, tax
obligations required to be withheld in respect of an award may be paid in whole
or in part in shares of Brooks common stock, including shares retained from such
award. The board will determine the effect on the award of the death,
disability, or retirement or other termination of employment of a participant
and the extent to which and period during which the participant's legal
representative, guardian or designated beneficiary may receive payment of an
award or exercise rights thereunder.

     The board of directors of Brooks may amend, suspend or terminate the 2000
plan or any portion of the 2000 plan at any time; provided that no amendment
shall be made without stockholder approval if such approval is necessary to
comply with any applicable law, rule or regulation.

UNITED STATES FEDERAL INCOME TAX CONSEQUENCES

     Please see "United States Federal Income Tax Consequences of the Brooks
1993 Nonemployee Director Stock Option Plan and 2000 Combination Stock Option
Plan" for a general discussion of the United States federal income tax
consequences of the issuance and exercise of options granted under the 2000
plan.

                                       125


VOTE REQUIRED AND BOARD OF DIRECTORS RECOMMENDATION

     The proposal to amend the Brooks 2000 combination stock option plan
requires the affirmative vote of a majority of the votes of holders of the
Brooks common stock present in person or by proxy at the Brooks annual meeting.

     THE BROOKS BOARD OF DIRECTORS RECOMMENDS THAT BROOKS STOCKHOLDERS VOTE FOR
THE PROPOSED AMENDMENT TO THE BROOKS 2000 COMBINATION STOCK OPTION PLAN.

UNITED STATES FEDERAL INCOME TAX CONSEQUENCES OF THE BROOKS 1993 NONEMPLOYEE
DIRECTORS PLAN AND 2000 COMBINATION STOCK OPTION PLAN

     The following general discussion of the United States federal income tax
consequences of the issuance and exercise of options granted under the Brooks
directors plan and the 2000 combination stock option plan, the subject of
Proposal Nos. 6 and 7, is based upon the provisions of the Internal Revenue Code
as in effect on the date hereof, current regulations promulgated and proposed
thereunder, existing public and private administrative rulings and
pronouncements of the Internal Revenue Service, and judicial decisions, all of
which are subject to change. This discussion is not intended to be a complete
discussion of all of the United Stated federal income tax consequences of the
directors plan or the 2000 plan or of all of the requirements that must be met
in order to qualify for the tax treatment described herein. Changes in the law
and regulations may modify the discussion, and in some cases the changes may be
retroactive. No information is provided as to state tax laws. Neither the
directors plan nor the 2000 plan is qualified under Section 401 of the Internal
Revenue Code, nor is either subject to the provisions of the Employee Retirement
Income Security Act of 1974. In addition, because tax consequences may vary and
certain exceptions may apply depending upon the personal circumstances of
individuals, each option holder should consider his or her personal situation
and consult with his or her tax advisor with respect to the specific tax
consequences applicable to him or her.

  NONQUALIFIED STOCK OPTIONS

     The recipient of a nonqualified stock option under the 2000 plan or the
directors plan generally will not recognize any taxable income upon the grant of
an option under either plan. Generally, he or she will recognize ordinary
taxable income at the time the option is exercised in an amount equal to the
excess of the fair market value of the shares of Brooks common stock received on
the date of exercise over the option exercise price. However, officers and
directors generally will be subject to Section 16(b) of the Securities Exchange
Act upon their sale of shares of Brooks common stock and this may affect their
tax liability. In the case of exercise of an option within six months of grant
by someone whose sale of shares of Brooks common stock would subject him or her
to liability under Section 16(b), recognition of income by the option holder
will be postponed. The Internal Revenue Service regulations have not yet been
amended to conform with the rules under Section 16(b). However, it is generally
anticipated that the date of recognition will be postponed to the earlier of (i)
six months after the date the option was granted, or (ii) the first day on which
the sale of the shares would not subject the individual to liability under
Section 16(b). It is possible that the six month period will instead run from
the option holder's most recent grant or purchase of Brooks common stock prior
to his or her exercise of the option. The option holder will generally recognize
ordinary taxable income on the recognition date in an amount equal to the excess
of the fair market value of the shares at that time over the option exercise
price. Despite this general rule, the option holder may make an election
pursuant to Section 83(b) of the Internal Revenue Code, in which case the option
holder will recognize ordinary taxable income at the time the option is
exercised and not on the later recognition date. In order to be effective, the
83(b) election must be filed with Brooks and the Internal Revenue Service within
30 days after exercise.

     The application of the tax rules to an option holder who receives shares
that are subject to a substantial risk of forfeiture (for example, if the shares
must be returned to Brooks if the recipient does not continue to work for Brooks
for a period of time specified in the award) are more complex. In that

                                       126


case, the recipient generally will not recognize income until the date that the
shares are no longer subject to the substantial risk of forfeiture, unless a
Section 83(b) election (described above) is made.

     Brooks will generally be entitled to a compensation deduction for federal
income tax purposes in an amount equal to the taxable income recognized by the
option holder, provided Brooks reports the income on a form W-2 or 1099
(whichever is applicable) that is timely provided to the option holder and
timely filed with the Internal Revenue Service.

     When an option holder subsequently disposes of the shares of Brooks common
stock received upon exercise of an option, he or she will generally recognize
capital gain or loss (long-term or short-term depending on the holding period of
the shares) in an amount equal to the difference between amount realized and the
fair market value of the shares on the date of exercise. The holding period for
the shares generally would begin on the date the shares were acquired and would
not include the period of time during which the option was held.

     An option holder who pays the exercise price, in whole or in part, by
delivering shares of Brooks common stock already owned by him or her will
generally recognize no gain or loss for United States federal income tax
purposes on the shares surrendered, but otherwise will be taxed according to the
rules described above. To the extent the shares acquired upon exercise are equal
in number to the shares surrendered, the basis of the shares received will be
equal to the basis of the shares surrendered. The basis of shares received in
excess of the shares surrendered upon exercise will be equal to the fair market
value of the shares on the date of exercise, and the holding period for the
shares received will commence on that date.

  INCENTIVE STOCK OPTIONS

     An option holder generally will not recognize taxable income upon either
the grant or the exercise of an incentive stock option. However, under certain
circumstances, there may be alternative minimum tax or other tax consequences,
as discussed below.

     An option holder will recognize taxable income upon the disposition of the
shares of Brooks common stock received upon exercise of an incentive stock
option. Any gain recognized upon a disposition that is not a "disqualifying
disposition," as defined below, will be taxable as long-term capital gain.

     A "disqualifying disposition" means any disposition of shares of Brooks
common stock acquired on the exercise of an incentive stock option where such
disposition occurs within two years of the date the stock option was granted or
within one year of the date the shares were transferred to the option holder.
The use of the shares acquired pursuant to the exercise of an incentive stock
option to pay the exercise price under another incentive stock option or under a
nonqualified stock option is treated as a disposition for this purpose. In
general, if an option holder makes a disqualifying disposition to an unrelated
party, an amount equal to the excess of (i) the lesser of (a) the fair market
value of the shares on the date of exercise or (b) the amount actually realized
on the disposition over (ii) the option exercise price will be taxable as
ordinary income, and the balance of the gain recognized, if any, will be taxable
as either long-term or short-term capital gain, depending on the option holder's
holding period for the shares. In the case of a gift or certain other transfers,
however, the amount of ordinary income taxable to the option holder will not be
limited to the amount of gain which would be recognized in the case of a sale to
an unrelated party. Instead, it will be equal to the excess of the fair market
value of the shares on the date of exercise over the option exercise price. The
holding period for the shares generally would begin on the date the shares were
acquired and would not include the period of time during which the option was
held.

     In general, in the year of exercise of an incentive stock option, an option
holder must compute the excess of the shares' fair market value on the date of
exercise over the exercise price and include this amount in the calculation of
his or her alternative minimum taxable income. Because of the many adjustments
that apply to the computation of the alternative minimum tax, it is not possible
to predict the application of the tax to any particular option holder. However,
an option holder may owe alternative minimum tax even though he or she has not
disposed of the shares or otherwise received any cash with

                                       127


which to pay the tax. The alternative minimum tax rate is higher than the rate
applicable to long-term capital gains.

     Brooks will not be entitled to any deduction with respect to the grant or
exercise of an incentive stock option provided the option holder does not make a
disqualifying disposition. If the option holder does make a disqualifying
disposition, Brooks will generally be entitled to a deduction for United States
federal income tax purposes in an amount equal to the taxable income recognized
by the option holder, provided Brooks reports the income on a timely provided
and filed Form W-2 or 1099, whichever is applicable.

                                       128


        BROOKS BOARD OF DIRECTORS MEETINGS, COMMITTEES AND COMPENSATION

MEETINGS OF THE BOARD OF DIRECTORS

     The board of directors of Brooks held five meetings during the fiscal year
ended September 30, 2001. The board of directors also acted on 38 occasions by
unanimous written consent in lieu of a special meeting. Each director attended
at least 75% of the aggregate number of all meetings of the board of directors
and committees of which he was a member during the fiscal year. The board of
directors currently has an audit committee and a compensation committee. The
board does not have a nominating committee.

     The compensation committee, currently composed of Messrs. Emerick and
Khoury, met once during the fiscal year ended September 30, 2001. The functions
of the compensation committee include determining salaries, grants and awards
under incentive plans, benefits and overall compensation.

AUDIT COMMITTEE REPORT

     The audit committee is currently comprised of three of Brooks' directors,
Messrs. Emerick, Khoury and Martin. All three members of the Brooks audit
committee are "independent" as defined in the listing standards of the Nasdaq
National Market. The audit committee, which met on four occasions during the
fiscal year ended September 30, 2001, operates pursuant to a charter which was
approved and adopted by the board of directors on June 5, 2000. Under the
provisions of the audit committee charter, the audit committee is responsible
for, among other things: recommending the engagement and overseeing the
performance of Brooks' independent auditors; reviewing Brooks' financial
disclosure documents; monitoring Brooks' financial reporting process and
internal control systems; monitoring potential conflicts of interest among
Brooks and its executive officers and directors; and providing a liaison between
the independent auditors and the board of directors.

     The audit committee has reviewed and discussed with Brooks' management the
audited consolidated financial statements for the fiscal year ended September
30, 2001. The audit committee has also discussed with PricewaterhouseCoopers
LLP, Brooks' independent auditors, the matters required to be discussed by the
Auditing Standards Board Statement on Auditing Standards No. 61, as amended. As
required by Independence Standards Board Standard No. 1, as amended,
"Independence Discussion with Audit Committees," the audit committee has
received and reviewed the required written disclosures and a confirming letter
from PricewaterhouseCoopers LLP regarding their independence, and has discussed
the matter with the auditors.

     Based on its review, the audit committee has recommended to the board of
directors that Brooks' audited consolidated financial statements for the fiscal
year ended September 30, 2001 be included in Brooks' annual report on Form
10-K/A for the fiscal year ended September 30, 2001. Further, the audit
committee has recommended that the board of directors engage
PricewaterhouseCoopers LLP as Brooks' independent auditors for the fiscal year
ending September 30, 2002.

                                          Audit Committee

                                          Roger D. Emerick
                                          Amin J. Khoury
                                          Joseph R. Martin

                                       129


INDEPENDENT AUDITOR FEES

     Audit Fees.  PricewaterhouseCoopers LLP billed Brooks an aggregate of
$548,805 for professional services rendered in connection with its audit of
Brooks' financial statements for the fiscal year ended September 30, 2001 and
its review of Brooks' quarterly reports on Form 10-Q during fiscal 2001.

     Financial Information Systems Design and Implementation.  During fiscal
2001, PricewaterhouseCoopers LLP did not bill Brooks for any professional
services rendered to Brooks in connection with financial information systems
design and implementation, the operation of Brooks' information systems or the
management of its local area networks.

     All Other Fees.  PricewaterhouseCoopers LLP billed Brooks $2,003,445 for
professional services not otherwise described above rendered during fiscal 2001.
These fees include fees for tax-related services, review of certain corporate
filings, and other consulting services. Brooks' audit committee considered the
non-audit services rendered by PricewaterhouseCoopers LLP during fiscal 2001 and
determined that such services were compatible with PricewaterhouseCoopers LLP's
independence.

COMPENSATION OF DIRECTORS

     Nonemployee directors of Brooks receive $1,000 cash compensation annually,
in addition to expenses reasonably incurred, for service on the board.
Nonemployee directors who are members of the audit or compensation committees
receive $4,000 per year for their services on each committee. If the merger is
approved, the annual cash compensation for nonemployee directors will increase
to $20,000 for service on the board, and $5,000 for service on each committee.
Each nonemployee director is granted options to purchase 10,000 shares of Brooks
common stock on the date he is first elected a director and options to purchase
5,000 shares of common stock on July 1 of each year thereafter pursuant to
Brooks' 1993 nonemployee director stock option plan. The board of directors has
amended the directors plan to increase the initial and annual grants thereunder
to 25,000 and 10,000 shares, of Brooks common stock, respectively, and to
provide an additional one-time grant of 15,000 shares to existing nonemployee
directors, subject to stockholder approval. See "Brooks Proposal No.
6 -- Amendment of the Brooks 1993 Nonemployee Director Stock Option Plan."
Employee directors may elect to participate in Brooks' 1995 employee stock
purchase plan and may be granted options under Brooks' 1992 combination stock
option plan or Brooks' 2000 combination stock option plan. Nonemployee directors
may be granted options under the 1992 combination stock option plan.

INDEMNIFICATION AGREEMENTS

     Brooks has entered into indemnification agreements with each of its
directors and anticipates that it will enter into similar agreements with any
future directors. Generally, the indemnification agreements attempt to provide
the maximum protection permitted by Delaware law with respect to indemnification
of the director.

     The indemnification agreements provide that Brooks will pay certain amounts
incurred by a director in connection with any civil or criminal action or
proceeding, specifically including actions by or in the name of Brooks
(derivative suits) where the individual's involvement is by reason of the fact
that he is or was a director or officer. Such amounts include, to the maximum
extent permitted by law, attorney's fees, judgments, civil or criminal fines,
settlement amounts, and other expenses customarily incurred in connection with
legal proceedings. Under the indemnification agreements, a director will receive
indemnification unless he is found not to have acted in good faith and in a
manner he reasonably believed to be in the best interests of Brooks.

                                       130


       SECURITY OWNERSHIP OF DIRECTORS, NOMINEES, EXECUTIVE OFFICERS AND
                        PRINCIPAL STOCKHOLDERS OF BROOKS

     The following table provides information regarding the beneficial ownership
of Brooks common stock as of March 31, 2002 by:

     - each director of Brooks;

     - each nominee for director of Brooks;

     - each person known by Brooks to be the beneficial owner of more than 5% of
       its common stock;

     - Brooks' named executive officers;

     - all current executive officers and directors of Brooks as a group; and

     - each of Mitchell G. Tyson and Kenneth M. Thompson (if the merger is
       completed, Brooks plans to appoint Messrs. Tyson and Thompson to its
       board of directors).

     Beneficial ownership is determined according to the rules of the SEC.
Except as indicated by footnotes and subject to community property laws, where
applicable, the persons named below have sole voting and investment power with
respect to all shares shown as beneficially owned by them. The "right to
acquire" column reflects beneficial ownership of shares subject to options that
may be exercised within 60 days after March 31, 2002.

     The percentage beneficially owned by each person is based upon 20,268,460
shares of Brooks common stock outstanding as of March 31, 2002. The shares that
a person has the right to acquire are deemed to be outstanding solely for
purposes of calculating that person's percentage ownership.

     The current directors and executive officers of Brooks have entered into
voting agreements with PRI in which they agreed to vote all of their shares of
Brooks common stock in favor of the approval and adoption of the merger
agreement and have executed irrevocable proxies with respect to their shares in
favor of PRI. Likewise, the current directors and executive officers of PRI have
entered into voting agreements with Brooks in which they agreed to vote all of
their shares of PRI common stock in favor of the approval and adoption of the
merger agreement and have executed irrevocable proxies with respect to their
shares in favor of Brooks.

     Unless otherwise noted below, the address of each person listed in the
table is c/o Brooks Automation, Inc., 15 Elizabeth Drive, Chelmsford,
Massachusetts 01824.



                                                  NUMBER OF SHARES BENEFICIALLY OWNED
                                                  ------------------------------------    PERCENTAGE
                                                                  RIGHT TO               BENEFICIALLY
NAME OF BENEFICIAL OWNER                          OUTSTANDING     ACQUIRE      TOTAL        OWNED
------------------------                          -----------     --------   ---------   ------------
                                                                             
Robert J. Therrien..............................   1,007,973      117,931    1,125,904        5.5%
Charles M. McKenna..............................         754       18,750       19,504          *
Michael W. Pippins(1)...........................      41,013       34,800       75,813          *
Ellen B. Richstone..............................       8,753       52,000       60,753          *
Jeffrey A. Cassis...............................         242       32,628       32,870          *
James A. Pelusi.................................      34,908       27,500       62,408          *
David R. Beaulieu...............................       1,523       20,939       22,462          *
Roger D. Emerick................................       9,000       31,000       40,000          *
Amin J. Khoury..................................           0       10,000       10,000          *
Juergen Giessmann(2)............................     791,072        5,000      796,072        3.9%
Joseph R. Martin................................           0            0            0          *
Mitchell G. Tyson(3)............................      92,061      105,918      197,979          *
Kenneth M. Thompson(4)..........................           0       13,000       13,000          *
Kopp Investment Advisors, Inc.(5)...............     914,670            0      914,670        4.5%
  7701 France Avenue South, Suite 500
  Edina, Minnesota 55435


                                       131




                                                  NUMBER OF SHARES BENEFICIALLY OWNED
                                                  ------------------------------------    PERCENTAGE
                                                                  RIGHT TO               BENEFICIALLY
NAME OF BENEFICIAL OWNER                          OUTSTANDING     ACQUIRE      TOTAL        OWNED
------------------------                          -----------     --------   ---------   ------------
                                                                             
T. Rowe Price Associates, Inc.(6)...............   1,095,800            0    1,095,800        5.4%
  100 East Pratt Street
  Baltimore, Maryland 21202
State Street Research and Management Company(7)    1,375,700            0    1,375,700        6.8%
  One Financial Center, 30th Floor
  Boston, Massachusetts 02111-2690
All directors and executive officers as a
  group(1)(2)(8)(11 persons)....................   1,869,035      329,734    2,198,769       10.7%


---------------

 *  Represents beneficial ownership of less than 1%.

(1) Includes 700 shares held by Mr. Pippins' minor children.

(2) Includes 791,072 shares held by M+W Zander Holding GmbH, as to which Mr.
    Giessmann disclaims beneficial ownership. Mr. Giessmann is the chief
    executive officer of M+W Zander.

(3) For purposes of determining beneficial ownership, assumes the merger is
    completed, that therefore each share of PRI common stock held by Mr. Tyson
    is converted to 0.52 shares of Brooks common stock and that options to
    purchase PRI common stock held by Mr. Tyson have been assumed by Brooks and
    are exercisable for shares of Brooks common stock. See "The Merger
    Agreement -- Treatment of PRI Stock Options and Warrants." The percentage
    beneficially owned continues to be based upon 20,268,460 shares of Brooks
    common stock and does not give effect to the completion of the merger.

(4) For purposes of determining beneficial ownership, assumes the merger is
    completed and that therefore options to purchase PRI common stock held by
    Mr. Thompson have been assumed by Brooks and are exercisable for shares of
    Brooks common stock. See "The Merger Agreement -- Treatment of PRI Stock
    Options and Warrants." The percentage beneficially owned continues to be
    based upon 20,268,460 shares of Brooks common stock and does not give effect
    to the completion of the merger.

(5) Kopp Investment Advisors, Inc. filed a Schedule 13G with the SEC on January
    23, 2002 on behalf of itself, Kopp Holding Company and LeRoy C. Kopp
    indicating beneficial ownership of this amount. Of this amount, Kopp
    Investment Advisors has sole voting power with respect to 392,100 shares and
    sole dispositive power with respect to 200,000 shares. It exercises
    investment discretion as to 714,670 shares, although it does not own such
    shares. Kopp Investment Advisors is wholly owned by Kopp Holding Company,
    which is wholly owned by LeRoy C. Kopp. Mr. Kopp has sole voting and
    dispositive power with respect to 128,000 shares.

(6) T. Rowe Price Associates, Inc. filed a Schedule 13G with the SEC on February
    14, 2002 indicating beneficial ownership of this amount. Of this amount, T.
    Rowe Price Associates, Inc. has sole voting power as to 323,000 shares and
    sole dispositive power as to 1,095,800 shares. These securities are owned by
    various individual and institutional investors which T. Rowe Price
    Associates, Inc. ("Price Associates") serves as investment adviser with
    power to direct investments and/or sole power to vote the securities. For
    purposes of the reporting requirements of the Exchange Act, Price Associates
    is deemed to be the beneficial owner of such securities; however, Price
    Associates expressly disclaims that it is, in fact, the beneficial owner of
    such securities.

(7) State Street Research and Management Company filed a Schedule 13G with the
    SEC on February 15, 2002 indicating beneficial ownership of this amount. Of
    this amount, State Street Research and Management Company has sole voting
    power as to 1,361,900 shares and sole dispositive power as to 1,375,700
    shares.

(8) Excludes shares beneficially owned by Mr. Pelusi and Mr. Beaulieu, two of
    Brooks' named executive officers for fiscal 2001, because they ceased to be
    named executive officers of Brooks in July 2001 and August 2001,
    respectively.

                                       132


            SECURITY OWNERSHIP OF DIRECTORS, EXECUTIVE OFFICERS AND
                         PRINCIPAL STOCKHOLDERS OF PRI

     The following table provides information regarding the beneficial ownership
of PRI common stock as of March 31, 2002 by:

     - each person known by PRI to be the beneficial owner of more than 5% of
       its common stock;

     - PRI's named executive officers;

     - each director of PRI; and

     - all current executive officers and directors of PRI as a group.

     Beneficial ownership is determined according to the rules of the SEC.
Except as indicated by footnotes and subject to community property laws, where
applicable, the persons named below have sole voting and investment power with
respect to all shares shown as beneficially owned by them. The "right to
acquire" column reflects beneficial ownership of shares subject to options that
may be exercised within 60 days after March 31, 2002.

     The percentage beneficially owned by each person is based upon 26,015,384
shares of PRI common stock outstanding as of March 31, 2002. The shares that a
person has the right to acquire are deemed to be outstanding solely for purposes
of calculating that person's percentage ownership.

     Certain current directors and executive officers of PRI have entered into
voting agreements with Brooks in which they agreed to vote all of their shares
of PRI common stock in favor of the approval and adoption of the merger
agreement and have executed irrevocable proxies with respect to their shares in
favor of Brooks.

     Unless otherwise noted below, the address of each person listed in the
table is c/o PRI Automation, Inc., 805 Middlesex Turnpike, Billerica,
Massachusetts 01821.



                                                  NUMBER OF SHARES BENEFICIALLY OWNED
                                                  -----------------------------------    PERCENTAGE
                                                                RIGHT TO                BENEFICIALLY
NAME OF BENEFICIAL OWNER                          OUTSTANDING    ACQUIRE      TOTAL        OWNED
------------------------                          -----------   ---------   ---------   ------------
                                                                            
Mordechai Wiesler(1)............................     468,777      120,075     588,852        2.3%
Dr. Amram Rasiel................................     476,210       42,000     518,210        2.0%
Mitchell G. Tyson(2)............................     177,042      203,690     380,732        1.5%
Boruch B. Frusztajer............................      30,000       42,000      72,000          *
Alexander V. d'Arbeloff.........................      64,767       42,000     106,767          *
Cosmo S. Trapani................................      14,408       24,500      38,908          *
Kenneth M. Thompson.............................          --       25,000      25,000          *
R. Brad Lawrence................................         751       15,250      16,001          *
Robert de Neve..................................          --       75,411      75,411          *
Edward Wagner...................................          --       39,375      39,375          *
All current executive officers and directors as
  a group(3) (9 persons)........................   1,231,955      589,926   1,821,881        6.8%


---------------

 *  Represents beneficial ownership of less than 1%.

(1) Includes 125,000 shares held by a limited partnership controlled by Mr.
    Wiesler.

(2) Includes 23,400 shares held by members of Mr. Tyson's family.

(3) Excludes shares beneficially owned by Mr. Wagner, one of PRI's named
    executive officers for fiscal 2001, because he ceased to be an executive
    officer of PRI in March 2001.

                                       133


                              MANAGEMENT OF BROOKS

     The names of Brooks' executive officers who are not directors of Brooks,
and certain biographical information furnished by them, are set forth below.



NAME                                        AGE              POSITION WITH BROOKS
----                                        ---              --------------------
                                            
Charles M. McKenna........................  56    Executive Vice President, Automation
                                                  Systems Division
Michael W. Pippins........................  41    Senior Vice President, Factory Interface
                                                  Division
Ellen B. Richstone........................  50    Senior Vice President, Finance and
                                                  Administration and Chief Financial Officer
Jeffrey A. Cassis.........................  48    Senior Vice President, Factory Automation
                                                  Software Division


     Mr. Charles M. McKenna, Ph.D., joined Brooks in July 2000 as executive vice
president, automation systems division. From April 1999 until January 2000, Mr.
McKenna was chief operating officer and chief technology officer for Varian
Semiconductor Equipment Associates, a spin-off of Varian Associates, a
manufacturer of semiconductor production equipment. Prior to this, Mr. McKenna
served in a variety of positions at Varian Associates' Ion Implant Systems
business, including general manager from April 1989 to March 1999. From March
1981 to January 1984, Mr. McKenna held various positions at Hughes Research
Laboratory. Prior to 1981, Mr. McKenna held various positions at IBM
Corporation, Aitken Industries and Commonwealth Scientific Corporation.

     Mr. Michael W. Pippins has served as senior vice president, factory
interface division since June 2000. From October 1998 to June 2000, Mr. Pippins
served as Brooks' vice president, global operations and business development.
Mr. Pippins joined Brooks in March 1992 as its director of sales and marketing
and in June 1993 was promoted to vice president, sales and marketing. From 1989
to 1992, Mr. Pippins served as strategic marketing manager for Varian
Associates.

     Ms. Ellen B. Richstone joined Brooks in November 1998 as senior vice
president, finance and administration, and chief financial officer. From 1997 to
November 1998, Ms. Richstone served as executive vice president and chief
financial officer of The Frontier Group, a start-up health care provider. From
1992 to 1996, Ms. Richstone served as vice president and chief financial officer
of Augat, Inc., a manufacturer of telecommunications, electronics and automotive
products. In 1992, Ms. Richstone also served Rohr Inc. as senior vice president
and chief financial officer. From 1989 to 1992, Ms. Richstone served as
executive vice president and chief financial officer of Honeywell Bull
Information Systems, and from 1981 to 1989 she served in various management
positions and finally as vice president and treasurer of Data General
Corporation.

     Mr. Jeffrey A. Cassis served as the former vice president of worldwide
sales and marketing for FASTech Integration, Inc. from 1993 until the
acquisition of FASTech by Brooks in September 1998. Since the acquisition, Mr.
Cassis has assumed all responsibility for the factory automation software
division within Brooks as the senior vice president. Before joining FASTech, Mr.
Cassis was director of sales and marketing for Intellution, Inc., an industrial
automation software company. From 1987 to 1989, Mr. Cassis had marketing
responsibility for the industrial automation division at Analog Devices, and
prior to that, product marketing management responsibility at The Foxboro
Company.

                                       134


                BROOKS EXECUTIVE COMPENSATION AND OTHER MATTERS

     The following Summary Compensation Table sets forth the compensation during
the last three fiscal years of each of the chief executive officer, the
executive vice president, and the five other most highly compensated executive
officers of Brooks.

                           SUMMARY COMPENSATION TABLE



                                                                                                     LONG TERM
                                                                                                   COMPENSATION
                                                                   ANNUAL COMPENSATION                AWARDS
                                                           -----------------------------------   -----------------
                                                                                  OTHER ANNUAL      SECURITIES        ALL OTHER
                                                  YEAR                            COMPENSATION   UNDERLYING OPTION   COMPENSATION
NAME AND PRINCIPAL POSITION                       ENDED    SALARY($)   BONUS($)      ($)(1)           (#)(2)            ($)(3)
---------------------------                      -------   ---------   --------   ------------   -----------------   ------------
                                                                                                   
Robert J. Therrien.............................  9/30/01    467,662         --       42,722           100,000           81,863
  Chief Executive Officer and                    9/30/00    421,108    218,000       40,309           270,000           47,750
  President(5)                                   9/30/99    356,605     95,172       27,513           115,000           35,418
Charles M. McKenna.............................  9/30/01    271,095         --        9,000            15,000           17,580
  Executive Vice President,                      9/30/00     56,058     27,500        2,063            60,000            1,843
  Automation Systems Division(4)                 9/30/99         --         --           --                --               --
Michael W. Pippins.............................  9/30/01    216,253         --       11,663            20,000           10,420
  Senior Vice President, Factory                 9/30/00    204,615     63,000       12,309            27,800            9,857
  Interface Division                             9/30/99    177,500     33,250       10,587            17,000            7,264
Ellen B. Richstone.............................  9/30/01    263,967         --       15,000            30,000           22,720
  Senior Vice President, Finance and             9/30/00    246,298    114,000       26,182            41,000           19,673
  Administration and Chief Financial             9/30/99    192,115     58,150       12,958            60,000           49,322
  Officer(5)
Jeffrey A. Cassis..............................  9/30/01    210,077         --        8,850            30,000           16,838
  Senior Vice President, Factory                 9/30/00         --         --           --                --               --
  Automation Software Division(6)                9/30/99         --         --           --                --               --
James A. Pelusi................................  9/30/01    254,978         --       12,500            15,000           13,607
  former Assistant to President(7)               9/30/00    239,039    100,000       13,399            85,000           13,811
                                                 9/30/99    189,940     45,000        9,538            49,000            6,610
David R. Beaulieu..............................  9/30/01    211,571         --       11,688            20,000           14,681
  former Vice President and General              9/30/00    204,615     63,000       15,231            27,800           13,861
  Manager, Vacuum Business                       9/30/99    178,269     33,250        9,890            19,000           10,617
  Unit(8)


---------------

(1) Represents lease and insurance payments made for automobiles used by Messrs.
    Therrien, Beaulieu, and Pippins, and automobile allowances for Messrs.
    Cassis, McKenna and Pelusi and Ms. Richstone. Represents reimbursement of
    interest and associated tax costs related to security transactions for Mr.
    Beaulieu, Mr. Pelusi and Ms. Richstone in fiscal 2000. Represents tax return
    preparation fees paid on behalf of Mr. Therrien and Ms. Richstone in fiscal
    2000 and Messrs. Therrien, Beaulieu, Cassis, Pelusi and Pippins in fiscal
    2001.

(2) Brooks did not make any restricted stock awards, grant any stock
    appreciation rights or make any long-term incentive payments to the
    executive officers named in the table above during fiscal 1999, 2000 or
    2001.

                                       135


(3) "All Other Compensation" above consists of the following:



                                                   YEAR ENDED SEPTEMBER 30,
                                                 ----------------------------
                                                   2001      2000      1999
                                                 --------   -------   -------
                                                             
Robert J. Therrien
  401(k) matching contributions................  $  5,063   $ 2,196   $ 1,639
  Life insurance premiums......................    76,800    45,554    33,779
                                                 --------   -------   -------
                                                 $ 81,863   $47,750   $35,418
Charles M. McKenna
  401(k) matching contributions................  $  3,250   $    --        --
  Life insurance premiums......................    14,330        43        --
  Consulting fees..............................        --     1,800        --
                                                 --------   -------   -------
                                                 $ 17,580   $ 1,843        --
Michael W. Pippins
  401(k) matching contributions................  $  5,518   $ 4,926   $ 2,319
  Life insurance premiums......................     4,902     4,931     4,945
                                                 --------   -------   -------
                                                 $ 10,420   $ 9,857   $ 7,264
Ellen B. Richstone
  401(k) matching contributions................  $  5,028   $ 3,489   $ 1,243
  Life insurance premiums......................    17,692    16,184     8,079
  Signing bonus (see "Employment Contracts")...        --        --    40,000
                                                 --------   -------   -------
                                                 $ 22,720   $19,673   $49,322
Jeffrey A. Cassis
  401(k) matching contributions................  $  5,702        --        --
  Life insurance premiums......................    11,136        --        --
                                                 --------   -------   -------
                                                 $ 16,838        --        --
James A. Pelusi
  401(k) matching contributions................  $  4,990   $ 5,173   $ 2,271
  Life insurance premiums......................     8,617     8,638     4,339
                                                 --------   -------   -------
                                                 $ 13,607   $13,811   $ 6,610
David R. Beaulieu
  401(k) matching contributions................  $  5,498   $ 5,507   $ 2,674
  Life insurance premiums......................     9,183     8,354     7,943
                                                 --------   -------   -------
                                                 $ 14,681   $13,861   $10,617


(4) Mr. McKenna joined Brooks in July 2000.

(5) See "Employment Contracts" below. Ms. Richstone's $10,000 guaranteed annual
    bonus was paid ratably over the fiscal year with her salary.

(6) Mr. Cassis was promoted to senior vice president of factory automation
    software division on July 2, 2001. Prior to his promotion, Mr. Cassis was
    not considered an executive officer of Brooks, and therefore his
    compensation for that period is not provided, except that Brooks has
    disclosed Mr. Cassis' compensation for all of fiscal 2001.

(7) Mr. Pelusi assumed a reduced role and a change in title at Brooks on July 2,
    2001.

(8) Mr. Beaulieu assumed a reduced role with Brooks on August 13, 2001.

EMPLOYMENT CONTRACTS

     Robert J. Therrien.  Effective October 1, 2001, Brooks entered into an
employment agreement with Robert J. Therrien, its president and chief executive
officer, that replaced Mr. Therrien's former agreement, which expired on
September 30, 2001. Under the agreement, Mr. Therrien will continue in his role
as president and chief executive officer of Brooks for four years. If Mr.
Therrien identifies his

                                       136


successor as president and chief executive officer, then Mr. Therrien may become
chairman of the board of directors.

     The agreement entitles Mr. Therrien to a minimum annual salary of $500,000.
Mr. Therrien's minimum salary will increase to $615,000 upon completion of the
proposed merger with PRI. The agreement entitles Mr. Therrien to annual
discretionary bonuses determined by the compensation committee.

     The agreement provides that Mr. Therrien will receive monthly supplemental
retirement benefits equal to Mr. Therrien's monthly salary in effect as of the
date he terminates employment with Brooks. The monthly supplemental retirement
benefits will be paid for a period equal to one and one-half times the number of
months Mr. Therrien serves Brooks after October 1, 1994. For purposes of
calculating these benefits the contract generally provides that Mr. Therrien's
annual salary will be no less than $500,000 ($41,667 monthly). As of September
30, 2001, Mr. Therrien had seven years, or 84 months, of credited service. In
the event of Mr. Therrien's death or permanent disability, he or his estate has
the option of receiving his supplemental retirement compensation over a period
of not less than four years. If the merger with PRI is completed, Mr. Therrien's
minimum annual salary for purposes of calculating his supplemental retirement
benefits will increase to $615,000 ($51,250 monthly) and his supplemental
retirement benefit will be paid in a single, lump-sum payment on the first day
of the month following the termination of his employment.

     The table below describes the annual supplemental retirement benefits Mr.
Therrien would receive given different assumptions regarding his minimum annual
salary and time of service after October 1, 1994.

                       SUMMARY RETIREMENT BENEFITS TABLE



                                                        MONTHS OF SERVICE SINCE 10/1/94
                                                        -------------------------------
                             86 MONTHS                96 MONTHS                108 MONTHS               120 MONTHS
  ANNUAL SALARY AT         (MINIMUM AS OF
 TIME OF RETIREMENT          11/30/01)
------------------------------------------------------------------------------------------------------------------------
                                                                                      
      $500,000                $41,667                  $41,667                  $41,667                  $41,667
   (minimum as of      payable for 129 months   payable for 144 months   payable for 162 months   payable for 180 months
       10/1/01)
      $550,000                $45,833                  $45,833                  $45,833                  $45,833
                       payable for 129 months   payable for 144 months   payable for 162 months   payable for 180 months

      $600,000                $50,000                  $50,000                  $50,000                  $50,000
                       payable for 129 months   payable for 144 months   payable for 162 months   payable for 180 months

      $615,000                $51,250                  $51,250                  $51,250                  $51,250
(minimum if merger is  payable for 129 months   payable for 144 months   payable for 162 months   payable for 180 months
      completed)

      $650,000                $54,167                  $54,167                  $54,167                  $54,167
                       payable for 129 months   payable for 144 months   payable for 162 months   payable for 180 months


     Brooks has established a rabbi trust in connection with Mr. Therrien's
supplemental retirement benefits and purchased two insurance policies to fund
the payment of the supplemental retirement benefits. Currently, the rabbi trust
holds two whole life insurance policies with combined death benefits of
$5,000,000 and a combined cash surrender value of approximately $2,300,000. The
rabbi trust assets are unsecured and subject to the claims of creditors.

     In addition, Mr. Therrien will participate in all employee welfare and
benefit plans normally offered to other Brooks executives, except that he will
not participate in any retirement plan other than Brooks' 401(k) plan and will
only receive the supplemental retirement benefits. Mr. Therrien is entitled to
the use of an automobile during the term of his agreement.

     The employment agreement provides that if Mr. Therrien's employment is
terminated without "cause," or if Mr. Therrien terminates his employment for
"good reason," he will be entitled to receive his annual salary and bonus for
the remaining term of the agreement, continued life insurance coverage until
October 1, 2005 and medical, dental and vision insurance for life. The
employment agreement provides

                                       137


that cause means Mr. Therrien has: (i) habitually neglected his material duties
under the agreement; (ii) perpetrated fraud or embezzlement; or (iii) been
finally adjudicated to have committed a felony. The agreement provides that good
reason means Mr. Therrien has suffered, without his consent, a reduction in his
status at Brooks either through a demotion in his duties or a change in his
title.

     If Mr. Therrien is terminated for cause, he will only be entitled to
receive his then accrued salary and accrued vacation days and will forfeit all
benefits payable under the supplemental retirement benefit.

     In addition, if Mr. Therrien's employment is terminated or he resigns
following a change of control, as defined in the agreement, then Brooks is
obligated to pay Mr. Therrien a lump sum severance payment equal to three times
his base salary and bonus. Mr. Therrien would also be entitled to receive
payment of Mr. Therrien's earned but unpaid salary and pro rata bonus, an amount
equal to his accrued vacation pay, and his supplemental retirement benefits, as
well as benefits including continuation of life insurance coverage until October
1, 2005 and medical, dental and vision insurance for life.

     In the event of Mr. Therrien's termination or resignation following a
change of control, his resignation for good reason or his termination without
cause, his stock options will immediately vest and remain exercisable until the
earlier of 24 months following his termination or the expiration of the option
term. However, the extension of the option exercise period will not apply to any
options granted prior to September 30, 2001, if such extension would result in a
charge to earnings or other adverse accounting consequence.

     Mr. Therrien is entitled to reimbursement of any "parachute" excise tax
imposed on payments under the employment agreement.

     Mr. Therrien's employment agreement also contains noncompetition,
nonsolicitation and confidentiality provisions. The noncompetition and
nonsolicitation provisions prohibit Mr. Therrien from directly or indirectly
competing with, or soliciting employees of, Brooks so long as he is an employee
of Brooks and for a period of two years thereafter.

     Ellen B. Richstone.  In October 1998, Brooks entered into an employment
agreement with Ellen B. Richstone, its Senior Vice President, Finance and
Administration and Chief Financial Officer, which entitles Ms. Richstone to a
base salary of $225,000 per year, and to participation in the discretionary
executive bonus program, as well as a guaranteed annual bonus of $10,000 and a
one-time "signing" bonus of $40,000. In the event Ms. Richstone's employment
with Brooks is terminated for reasons other than cause, the agreement provides
that Ms. Richstone will receive either one year of her then current base salary
or $250,000, whichever is greater, and the acceleration of all of her
outstanding options.

     The agreement also provides Ms. Richstone with certain other benefits,
including an automobile allowance of $15,000 per year, the opportunity to
participate in insurance plans, and other employment benefits as may be
generally available to senior executives of Brooks. Brooks has entered into an
indemnification agreement with Ms. Richstone on the same terms as Brooks'
directors. See "Brooks Executive Compensation and Other
Matters -- Indemnification Agreements."

CHANGE IN CONTROL ARRANGEMENTS

     On November 11, 1999, Brooks entered into change of control agreements with
certain key employees, including each of its named executive officers other than
Mr. Therrien, whose employment contract offers change of control benefits. The
board of directors determined that it was in the best interests of Brooks and
its stockholders to assure that Brooks have the continued dedication of these
persons, notwithstanding the possibility, threat, or occurrence of a change in
control of Brooks. The purpose of the agreements is to diminish the inevitable
distraction for these persons caused by the personal uncertainties and risks
created by a pending or threatened change of control and to encourage their full
attention and dedication to Brooks currently and in the event of any threatened
or pending change of control. The agreements have terms of five years and
automatically renew in five-year increments unless a party to the agreement
objects in writing in advance of the renewal. The agreements provide that in the
event of a change of control these persons will retain their then current
compensation and benefits for the

                                       138


lesser of one year or until terminated for cause. The agreements also provide
that the position of such person upon a change of control shall be at least
commensurate with the highest position held by such person prior to the change
of control, after completion of a six month transitional period. Under the
agreements, if the employee is terminated other than for cause, disability or
death or if the employee resigns for good reason the employee is entitled to one
year of salary in a lump sum payment and the continuation of certain benefits
for 18 months. Under Ms. Richstone's change of control agreement, all of her
options will vest immediately and she will receive a lump sum payment equal to
the greater of $250,000 or her then current base salary if she is terminated
other than for cause, disability or death or resigns for good reason in
connection with a change of control of Brooks. For purposes of the agreements,
cause means willful acts of dishonesty, repeated breaches by the employee of the
agreement or the conviction of a felony involving moral turpitude. Good reason
includes diminution of the responsibility or position of the employee, Brooks'
breach of the agreement or the involuntary relocation of the employee.

INDEMNIFICATION AGREEMENTS

     In February 2000, Brooks entered into indemnification agreements with each
of its executive officers not previously covered by such agreements. The
indemnification agreements provide that Brooks will pay certain amounts incurred
by an officer in connection with any civil or criminal action or proceeding,
specifically including actions by or in the name of Brooks where the
individual's involvement is by reason of the fact that he is or was an officer.
Such amounts include, to the maximum extent permitted by law, attorney's fees,
judgments, civil or criminal fines, settlement amounts, and other expenses
customarily incurred in connection with legal proceedings. Under the
indemnification agreements, an officer will receive indemnification unless he or
she is found not to have acted in good faith and in a manner he or she
reasonably believed to be in the best interests of Brooks.

BONUS PLAN

     Brooks maintains a bonus program for employees, including executive
officers, under which such employees may be awarded cash bonuses based upon
Brooks' overall financial performance.

STOCK PURCHASE PLAN

     In February 1996, Brooks adopted the 1995 employee stock purchase plan to
provide employees of Brooks with additional incentives by permitting them to
acquire an equity interest in Brooks through the purchase of shares of Brooks
common stock. The stock purchase plan is intended to qualify as an "employee
stock purchase plan" under Section 423 of the Internal Revenue Code. See "Brooks
Proposal No. 5 -- Amendment of the Brooks 1995 Employee Stock Purchase Plan" for
more information.

STOCK OPTION PLANS

     The following tables set forth certain information with respect to the
stock options granted to and exercised by the named executive officers during
fiscal 2001 and the aggregate number of and value of options exercisable and
unexercisable held by the named executive officers during fiscal 2001.

                                       139


                       OPTION GRANTS IN LAST FISCAL YEAR



                                                                                     POTENTIAL REALIZABLE
                                                                                    VALUE AT ASSUMED ANNUAL
                          NUMBER OF        PERCENT OF                                RATES OF STOCK PRICE
                         SECURITIES      TOTAL OPTIONS                              APPRECIATION FOR OPTION
                         UNDERLYING        GRANTED TO                                     TERM($)(2)
                           OPTIONS        EMPLOYEES IN     EXERCISE    EXPIRATION   -----------------------
                        GRANTED(#)(1)     FISCAL YEAR        PRICE        DATE          5%          10%
                        -------------   ----------------   ---------   ----------   ----------   ----------
                                                           ($/SHARE)
                                                                               
Robert J. Therrien....     100,000            6.5           27.563       1/2/08     1,122,091    2,614,949
Charles M. McKenna....      15,000            1.0           27.563       1/2/08       168,314      392,242
Michael W. Pippins....      20,000            1.3           27.563       1/2/08       224,418      522,990
Ellen B. Richstone....      30,000            1.9           27.563       1/2/08       336,627      784,485
Jeffrey A. Cassis.....      10,000            0.6           40.030      7/16/11       251,747      637,975
                            20,000            1.3           27.563       1/2/08       224,418      522,990
James A. Pelusi.......      15,000            1.0           27.563       1/2/08       168,314      392,242
David R. Beaulieu.....      20,000            1.3           27.563       1/2/08       224,418      522,990


---------------

(1) Stock options become exercisable at the rate of 25% per year over a four
    year period commencing one year from the date of grant.

(2) The 5% and 10% assumed rates of annual compounded stock price appreciation
    are mandated by the rules of the SEC and do not represent Brooks' estimate
    or projection of future prices of its common stock.

   AGGREGATED OPTION EXERCISES IN LAST FISCAL YEAR AND FISCAL YEAR-END OPTION
                                     VALUES



                                                         NUMBER OF SECURITIES          VALUE OF UNEXERCISED
                                                        UNDERLYING UNEXERCISED        IN-THE-MONEY OPTIONS AT
                         SHARES                          OPTIONS AT 9/30/01(#)             9/30/01($)(2)
                       ACQUIRED ON       VALUE        ---------------------------   ---------------------------
NAME                   EXERCISE(#)   REALIZED($)(1)   EXERCISABLE   UNEXERCISABLE   EXERCISABLE   UNEXERCISABLE
----                   -----------   --------------   -----------   -------------   -----------   -------------
                                                                                
Robert J. Therrien...    40,500         577,939         58,250         360,000             --        687,988
Charles M. McKenna...        --              --         15,000          60,000             --             --
Michael W. Pippins...    10,000         345,370         40,550          49,350        624,629        101,703
Ellen B. Richstone...     2,000          88,325         23,250          90,750        173,420        400,200
Jeffrey A. Cassis....     9,309         253,803         11,250          72,628        169,650        339,300
James A. Pelusi......    16,997         585,516         31,269         103,538        116,818        379,006
David R. Beaulieu....    12,737         564,995         20,930          52,600        198,052        144,808


---------------

(1) The "value realized" reflects the appreciation on the date of exercise
    (based on the excess of the fair market value of the Brooks common stock on
    the date of exercise over the exercise price). However, because the named
    executive officers may keep the shares they acquired upon the exercise of
    the options (or sell them at a different price), these amounts do not
    necessarily reflect cash realized upon the sale of those shares.

(2) Based on the closing price of the Brooks common stock on September 28, 2001
    on the Nasdaq National Market of $26.59, minus the respective option
    exercise prices.

1992 COMBINATION STOCK OPTION PLAN

     Under Brooks' 1992 combination stock option plan, which is administered by
the compensation committee of the Brooks board of directors, Brooks may grant
both incentive stock options intended to qualify under Section 422 of the
Internal Revenue Code, and other options which are not qualified as incentive
stock options. Incentive stock options may only be granted to persons who are
employees of Brooks at the time of grant, which may include officers and
directors who are also employees. Nonqualified stock options may be granted to
persons who are officers, directors or employees of or

                                       140


consultants or advisors to Brooks, or persons who are in a position to
contribute to the long-term success and growth of Brooks at the time of grant.
Options granted under the 1992 plan generally vest over a period of four years.
A total of 1,950,000 shares of Brooks common stock were reserved for issuance
under the 1992 plan. Of these shares, options on 647,771 shares have been
granted and are outstanding and 32,131 shares remain available for grant as of
March 31, 2002. In order to align the 1992 plan with its current practices, in
January 2000 the board of directors amended the 1992 plan to eliminate Brooks'
ability to grant restricted stock under the 1992 plan and to require that all
options be granted with exercise prices not less than fair market value.

1993 NONEMPLOYEE DIRECTOR STOCK OPTION PLAN

     The purpose of the 1993 nonemployee director stock option plan is to
attract and retain the services of experienced and knowledgeable independent
directors of Brooks for the benefit of Brooks and its stockholders and to
provide additional incentives for such independent directors to continue to work
for the best interests of Brooks and its stockholders. See "Brooks Proposal No.
6 -- Amendment of the Brooks 1993 Nonemployee Director Stock Option Plan" for
more information.

1998 EMPLOYEE EQUITY INCENTIVE PLAN

     The purpose of the 1998 employee equity incentive plan, adopted by the
board of directors of Brooks in April 1998, is to attract and retain employees
and provide an incentive for them to assist Brooks to achieve long-range
performance goals, and to enable them to participate in the long-term growth of
Brooks. All employees of Brooks, other than its officers and directors,
(including contractors, consultants, service providers or others) who are in a
position to contribute to the long-term success and growth of Brooks, are
eligible to participate in the 1998 plan. As of September 30, 2001, 3,550,000
shares of Brooks common stock were reserved for issuance under the 1998 plan. On
October 1, 2001, the board amended the 1998 plan to increase the total number of
shares reserved for issuance thereunder to 4,750,000. On that date, the board
granted options to purchase 1,605,340 shares under the 1998 plan. On April 8,
2002, the board amended the 1998 plan to increase the total number of shares
reserved for issuance thereunder to 4,825,000. Of the shares reserved for
issuance under the 1998 plan, options on 4,395,893 shares have been granted and
are outstanding and 83,493 shares remain available for grant as of April 8,
2002. In order to align the 1998 plan with its current practices, in January
2000, the board of directors amended the 1998 plan to eliminate Brooks' ability
to award nonqualified stock options with exercise prices at less than fair
market value.

2000 COMBINATION STOCK OPTION PLAN

     The purposes of the 2000 combination stock option plan are to attract and
retain employees and to provide an incentive for them to assist Brooks to
achieve long-range performance goals and to enable them to participate in the
long-term growth of Brooks. Under the 2000 plan Brooks may grant (i) incentive
stock options intended to qualify under Section 422 of the Internal Revenue
Code, and (ii) options that are not qualified as incentive stock options. See
"Brooks Proposal No. 7 -- Amendment of the Brooks 2000 Combination Stock Option
Plan" for more information.

COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION

     The compensation committee of the board of directors consists of Messrs.
Emerick and Khoury. Neither Mr. Emerick nor Mr. Khoury is or was formerly an
officer or employee of Brooks. Mr. Therrien, the president and chief executive
officer of Brooks, has been delegated the authority to grant options to purchase
not more than 9,000 shares of Brooks common stock per employee per fiscal year
to employees who are not executive officers on terms that are consistent with
the 1992 plan, the 1998 plan and the 2000 plan. Mr. Therrien granted options to
purchase an aggregate of 6,750 shares of Brooks common stock in fiscal 2001.
Prior to November 1994, all decisions regarding compensation of executive
officers were made by the entire board of directors.

                                       141


COMPENSATION COMMITTEE REPORT

     The compensation committee of the board of directors is comprised of two
nonemployee directors and is responsible for establishing compensation policies
applicable to Brooks' executive officers, including its chief executive officer.
In discharging these responsibilities, the committee consults, as necessary,
with outside advisors.

  COMPENSATION PHILOSOPHY

     This report describes Brooks' compensation philosophy, which is designed to
accomplish the following goals:

     - attract and retain highly qualified executive officers;

     - motivate Brooks' executives to achieve Brooks' short and long term
       business objectives; and

     - provide incentives that closely align the interests of the executive
       officers with those of Brooks and its stockholders.

     To accomplish these goals, Brooks uses a combination of cash and equity
compensation to offer a balance between short-term and long-term incentives. The
compensation of executive officers consists of base compensation, bonus, the
grant of options and participation in benefit plans generally available to
employees.

     In fiscal year 2001 and consistent with its past practices, the committee
retained a compensation consultant to prepare an executive compensation
benchmarking study of comparative companies to help assess overall executive
compensation and specifically the compensation of Mr. Therrien, Brooks'
president. The compensation consultant has helped Brooks to implement its
compensation philosophy by:

     - comparing the compensation of Brooks' executive officers, including Mr.
       Therrien, to executives in comparable positions at various "peer"
       companies and other compensation survey data;

     - recommending modifications to base, bonus and equity compensation levels;
       and

     - recommending a comprehensive program of cash based incentives for Brooks.

  BASE SALARY

     The base salary of an executive officer is established after considering
the level of his responsibility and the quality of his performance. The
committee also reviewed data gathered through the executive compensation
benchmarking study. In assessing the information contained in the study, the
committee considered the size and the profitability of peer companies and the
nature of their business. No particular weight is given to any factors reviewed
by the committee. In setting compensation, Brooks' compensation philosophy has
been to target base compensation above the 50th percentile in comparison to its
peer companies.

  BONUS

     Executive officers are eligible to receive performance bonuses under
Brooks' bonus plan equal to between 20% and 50% of their base salary. The
bonuses are not guaranteed and are subject to Brooks' overall financial
performance. No bonuses were paid in fiscal year 2001.

  EQUITY COMPENSATION

     Each of the executive officers, including Mr. Therrien, and all key
employees are eligible to receive grants of options under the 1992 plan and 2000
plan. The 1992 plan and 2000 plan are used to align a portion of the executive
officers' and key employees' compensation with the stockholders' interests and
the long-term success of Brooks through the use of variable compensation. In
determining the number of options to be granted to each executive officer or key
employee, the committee uses surveys of independent compensation consultants
such as the fiscal 2001 benchmarking study and makes a subjective

                                       142


determination based on factors such as the individual's level of responsibility,
performance and number of options held by the individual. The committee gives no
particular weight to any factor. During fiscal 2001, options to purchase 10,000
shares of Brooks common stock were granted to executive officers under the 1992
plan and options to purchase 240,000 shares of Brooks common stock were granted
to executive officers under the 2000 plan. The 1995 employee stock purchase plan
provides all of Brooks' employees, including executive officers, with a means of
acquiring Brooks common stock, further aligning the interests of executive
officers, employees and stockholders.

  COMPENSATION OF CHIEF EXECUTIVE OFFICER

     Brooks entered into an employment agreement with Robert J. Therrien, its
chief executive officer, effective October 1, 2001. This employment agreement
entitles Mr. Therrien to a base salary of $500,000, subject to annual review.
Under the agreement Mr. Therrien also will receive consideration for
discretionary bonuses, certain life insurance benefits, supplemental retirement
benefit, an automobile allowance and other employment benefits as are generally
available to employees of Brooks. If the merger with PRI is consummated, Mr.
Therrien's salary will be increased to $615,000 and his supplemental retirement
benefits will be enhanced. See "Brooks Executive Compensation and Other
Matters -- Employment Contracts" for additional details.

     In establishing Mr. Therrien's compensation for fiscal 2001 and determining
whether to enter into a new employment agreement with Mr. Therrien the committee
held a number of meetings and considered several factors. The committee gives no
particular weight to any one factor. The committee retained the services of two
compensation consultants. Each consultant reviewed the proposed terms and
conditions of the employment agreement in light of market conditions existing
for the president and chief executive officer of a publicly traded technology
company and prepared studies evaluating and analyzing:

     - compensation programs of "peer" companies;

     - change of control, severance and benefit programs and other contractual
       arrangements for peers; and

     - the terms and conditions of the new employment agreement in comparison to
       Mr. Therrien's original employment agreement which expired on September
       30, 2001.

     The committee also considered and evaluated Mr. Therrien's leadership
ability and his contributions over the last several years in:

     - leading Brooks to substantial organic growth;

     - financing Brooks;

     - growing Brooks through several strategic acquisitions;

     - successfully integrating several acquired companies into Brooks; and

     - managing the expansion of Brooks' product offerings and market share.

     Mr. Therrien was not present at the committee meetings concerning his
compensation. The committee's decision in establishing Mr. Therrien's
compensation in fiscal year 2001 and in entering a new employment agreement with
Mr. Therrien was unanimously ratified by Brooks' board of directors.

  POLICY ON DEDUCTIBILITY OF EXECUTIVE COMPENSATION

     Section 162(m) of the Internal Revenue Code limits the deductibility of
nonperformance based compensation in excess of $1 million in any year paid to
the chief executive officer and the next four highest paid executive officers.
It is Brooks' general policy to comply with Section 162(m) and ensure that all
compensation paid to the chief executive officer and the next four highest paid
executives is deductible.

                                       143


Under some circumstances, compensation under Mr. Therrien's employment agreement
may not be deductible.

                                          Submitted by the members of the
                                          compensation committee.

                                          Roger D. Emerick
                                          Amin J. Khoury

PERFORMANCE GRAPH

     The following graph compares the change in Brooks' cumulative total
stockholder return for the last five fiscal years with the cumulative total
return on the CRSP Index for the NYSE/AMEX/Nasdaq Stock Market (U.S. Companies)
and the CRSP Index for NYSE/AMEX/Nasdaq (SIC 3550-3559 U.S. Companies) Special
Industry Machinery, Except Metalworking Machinery, for that period.

                COMPARISON OF FIVE-YEAR CUMULATIVE TOTAL RETURNS
                             PERFORMANCE REPORT FOR
                            BROOKS AUTOMATION, INC.

                               [COMPARISON CHART]



------------------------------------------------------------------------------------------------------------------
                                       Sep. 30      Sep. 30      Sep. 30      Sep. 30      Sep. 29      Sep. 28
                                         1996         1997         1998         1999         2000         2001
------------------------------------------------------------------------------------------------------------------
                                                                                    
 Brooks Automation, Inc.               $100.00      $303.96      $ 78.71      $139.11      $262.38      $210.61
------------------------------------------------------------------------------------------------------------------
 NYSE/AMEX/Nasdaq Stock Market (US
   Company)                            $100.00      $137.52      $142.36      $181.14      $214.28      $152.10
------------------------------------------------------------------------------------------------------------------
 NYSE/AMEX/NASDAQ Stocks (SIC
   3550-3559 US Companies)             $100.00      $239.08      $108.86      $277.69      $413.15      $203.32
------------------------------------------------------------------------------------------------------------------


     Assumes $100 invested on September 30, 1996, the last trading day of fiscal
1996, in the common stock, the CRSP Index for the NYSE/AMEX/Nasdaq Stock Market
(U.S. Companies) and the CRSP Index for NYSE/AMEX/Nasdaq (SIC 3550-3559 U.S.
Companies) Special Industry Machinery, Except Metalworking Machinery, and the
reinvestment of all dividends.

                                       144


            CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS OF BROOKS

LAM RESEARCH CORPORATION

     Purchases by Lam accounted for approximately 12%, 11% and 7% of Brooks'
revenues during fiscal 1999, 2000 and 2001, respectively. From 1982 until
January 2001, Roger D. Emerick, who serves on Brooks' board of directors, served
as a director on Lam's board of directors. See "Brooks Proposal No.
3 -- Election of Directors" for more information. There is no agreement or
arrangement requiring the election of Mr. Emerick or any other representative of
Lam to serve as a director of Brooks.

     Sales to Lam have been made in the ordinary course of Brooks' business, and
Brooks believes that the terms of its transactions with Lam have not been less
favorable to Brooks than could have been obtained from a party unaffiliated with
Brooks purchasing products of similar types and at comparable volumes.

FAIRCHILD SEMICONDUCTOR INTERNATIONAL, INC.

     On June 11, 2001, Brooks appointed Joseph Martin to its board of directors.
Mr. Martin also serves on the board of Fairchild Semiconductor International, a
customer of Brooks. Revenues generated from Fairchild Semiconductor for the
period from June 11, 2001 through September 30, 2001 were not material to
Brooks' consolidated results for fiscal 2001. There is no agreement or
arrangement requiring the election of Mr. Martin or any other representative of
Fairchild Semiconductor to serve as a director of Brooks.

     Sales to Fairchild Semiconductor have been made in the ordinary course of
Brooks' business, and Brooks believes that the terms of the transactions with
Fairchild Semiconductor have not been less favorable to Brooks than could have
been obtained from a party unaffiliated with Brooks purchasing products of
similar types and at comparable volumes.

JENOPTIK STOCKHOLDER AGREEMENT

     On September 30, 1999, Brooks acquired substantially all of the assets and
assumed certain of the liabilities of the Infab Division of Jenoptik AG in
exchange for 914,286 shares of Brooks common stock issued to Jenoptik's
subsidiary M+W, subject to a 5% holdback and to adjustment. As part of this
acquisition, Brooks appointed Juergen Giessmann, a member of the board of
directors of Jenoptik, to Brooks' board of directors pursuant to a stockholder
agreement dated September 30, 1999 among Brooks, Jenoptik, M+W, and Robert J.
Therrien. Under the stockholder agreement, until Jenoptik no longer holds all
its shares purchased from Brooks in this transaction, or until September 30,
2004, whichever occurs first, Brooks agreed to nominate a reasonably acceptable
candidate of Jenoptik to Brooks' board of directors in each election of Brooks'
directors, and Robert J. Therrien agreed to vote all his shares in favor of such
nominees for election to the board of directors. These voting obligations of
Brooks and Mr. Therrien expired in fiscal 2001 when Jenoptik sold some of its
shares of Brooks common stock. Jenoptik agreed to cause M+W to vote in favor of
the other candidates to Brooks' board of directors nominated by Brooks' existing
board. Jenoptik also agreed to cause M+W to vote for other matters in accordance
with the recommendation of a majority of the Brooks board. Jenoptik agreed not
to buy or sell shares of the common stock except in specified circumstances.
Jenoptik further agreed to share certain information with Brooks regarding
upcoming factory automation projects, to give Brooks a right of first refusal as
a supplier and to award Brooks an exclusive supply contract with guaranteed,
minimum gross margin of at least $15 million in connection with an upcoming
project. Jenoptik and Brooks also entered into a one year transitional services
agreement, pursuant to which Jenoptik agreed to allow Brooks to occupy space at
its Jena, Germany manufacturing facility and to receive support services from
Jenoptik. Brooks agreed to reimburse Jenoptik for the provision of space and
support services at cost. This transitional services agreement was extended
through December 2002. Brooks has paid Jenoptik a total of $1.6 million through
December 31, 2001 under this agreement, of which $1.1 million was attributable
to the leasing of warehousing and manufacturing facilities.

     On October 16, 2000, the parties amended the agreement to permit the
removal of the transfer restrictions with respect to an aggregate of 868,572
shares of Brooks common stock held by Jenoptik, and

                                       145


the grant by Brooks of certain registration rights under the Securities Act of
1933, as amended, with respect to such shares. In consideration for a payment of
$5.1 million, Brooks released certain claims for indemnification against
Jenoptik and agreed as soon as commercially reasonable after January 15, 2001 to
register 434,286 shares of Brooks common stock held by Jenoptik. Brooks has
further agreed to register an additional 434,286 shares as soon as commercially
reasonable after October 15, 2002. The amendment released Jenoptik from the
requirement to award Brooks the exclusive contract with guaranteed gross margins
and Jenoptik released its claims to the 5% holdback.

DAIFUKU STOCKHOLDER AGREEMENT

     On January 6, 2000, Brooks completed the acquisition of Auto-Soft
Corporation and AutoSimulations, Inc. from their sole stockholder, Daifuku
America Corporation, the U.S. affiliate of Daifuku Co., Ltd., for $27 million in
cash, 535,404 shares of Brooks common stock and issuance of a note in the amount
of $16 million which was repaid on January 5, 2001. The note was unsecured and
bore interest at 4% per year. As part of the transaction, Daifuku America
Corporation and Daifuku Co., Ltd. entered into a stockholder agreement with
Brooks under which they agreed to take such action as may be required so that
all voting securities of Brooks owned by them and their affiliates (i) are
represented at all meetings and (ii) are voted in accordance with the
recommendation of Brooks' board of directors. The stockholder agreement also
restricted Daifuku from buying or selling shares of Brooks common stock except
in specified circumstances. A separate registration rights agreement granted
Daifuku certain registration rights for the stock it received in the
transaction. The parties also entered into a series of technology cross-
licensing arrangements related to the technology of the two acquired companies
and Daifuku which, in some cases, provide most favored customer terms. Daifuku
America Corporation has sold all its shares of Brooks common stock.

                                       146


                               PRI PROPOSAL NO. 3

              AMENDMENT OF PRI'S 2000 EMPLOYEE STOCK PURCHASE PLAN

     This proposal applies only to PRI stockholders. Brooks stockholders are not
entitled to vote on this proposal.

BACKGROUND; REASON FOR AMENDMENT

     On September 25, 2001, PRI's board of directors voted to amend PRI's 2000
employee stock purchase plan to increase the total number of shares available
for issuance under the plan from 350,000 to 850,000. PRI's board of directors
initially adopted the 2000 plan in November 1999, and the stockholders approved
the 2000 plan in March 2000.

     The 2000 plan allows all eligible employees of PRI to purchase shares of
PRI common stock at a discounted price by electing to have a percentage of their
pay deducted during a six-month offering period and directed toward the purchase
of PRI common stock.

     PRI is requesting that the PRI stockholders approve this amendment solely
so that the plan will continue to be qualified under Section 423 of the Internal
Revenue Code, which provides favorable tax treatment to employees with respect
to shares purchased under employee stock purchase plans. If the PRI stockholders
do not approve the amendment to the 2000 plan, it will not be qualified under
Section 423 of the Internal Revenue Code with respect to the additional 500,000
shares made available for issuance under the plan as a result of the amendment,
and, as a result, PRI employees who participate in the 2000 plan will not be
able to take advantage of the tax benefits made available by Section 423 of the
Internal Revenue Code with respect to those additional shares.

     PRI's board of directors believes that offering PRI's employees the
opportunity to purchase stock in a qualified plan allows PRI to align more
closely the interests of its employees with the interests of its stockholders
and helps to attract and retain key employees. PRI's board of directors believes
that such plans are a common feature of employee compensation in the
semiconductor manufacturing equipment industry.

     PRI has offered its employees an employee stock purchase plan qualified
under Section 423 of the Internal Revenue Code since its initial public offering
in 1994. PRI's board of directors believes that PRI's employees view the
availability of a qualified employee stock purchase plan as an important benefit
of their employment with PRI. PRI's board of directors believes that PRI has
derived substantial benefits from maintaining a qualified employee stock
purchase plan in the past, and that PRI, whether as part of a combined
enterprise with Brooks or as an independent company, will derive similar
benefits from continuing to maintain, without interruption, a qualified plan.

SUMMARY OF THE 2000 PLAN

     This summary of the 2000 plan is qualified in its entirety by the specific
language of the amended 2000 plan.

     The 2000 plan is intended to provide a method of broad-based equity
compensation whereby employees of PRI will have an opportunity to acquire an
ownership interest in PRI through the purchase of shares of PRI common stock.
PRI intends that the 2000 plan will continue to qualify as an employee stock
purchase plan under Section 423 of the Internal Revenue Code. Accordingly, PRI
will construe the provisions of the 2000 plan so as to extend and limit
participation in a manner consistent with the requirements of that section of
the Internal Revenue Code. The 2000 plan is administered by the compensation
committee of PRI's board of directors.

     Eligible employees of PRI currently have the right to purchase stock under
the 2000 plan in a series of six-month offerings. PRI's compensation committee,
in its discretion, determines the applicable commencement and termination dates
for each offering. An employee may participate in any one or more of the
offerings without being prohibited from or required to participate in any other
offering. If the

                                       147


proposal to merge PRI with Brooks is approved, the current offering period will
terminate on the day before the effective date of the merger.

     During each offering period under the 2000 plan, participating employees
are entitled to purchase shares through payroll deductions. An eligible employee
can elect to have 1% to 10% of his or her base pay withheld during the offering
period. During each offering period, the price at which the employee is able to
purchase PRI common stock is 85% of the last reported sale price of the common
stock on the Nasdaq National Market on the trading date before the offering
period begins or the trading date before the offering period ends, whichever is
lower.

     All PRI employees who are customarily employed for twenty or more hours per
week and five months per calendar year, and who are employed by PRI on the first
day of the applicable offering period, are eligible to participate in the 2000
plan. As of March 31, 2002, 1,220 employees were eligible to participate in the
plan. No employee is permitted to purchase shares under the 2000 plan, if, after
the purchase, the employee would own 5% or more of the total combined voting
power or value of PRI's stock. A person's participation in the 2000 plan ends
automatically upon termination of that person's employment with PRI.

     No employee may be granted an option under the 2000 plan that would permit
that employee's rights to purchase PRI common stock to accrue at a rate in
excess of $25,000 in fair market value of PRI common stock, when the option is
granted, for each calendar year in which the option is outstanding at any time.
Additionally, no employee may purchase more than 1,000 shares during any
offering period under the 2000 plan.

AMENDMENT OF THE 2000 PLAN

     PRI's board of directors may terminate or amend the 2000 plan at any time.
Termination of the 2000 plan would not affect options previously granted, nor
can an amendment make any change in any option theretofore granted if the change
would adversely affect the rights of any participant with respect to outstanding
options.

UNITED STATES FEDERAL INCOME TAX INFORMATION

     The following discussion is intended only as a brief overview of certain of
the current United States federal income tax laws applicable to the 2000 plan.
The following discussion assumes that the PRI stockholders approve the amendment
to the 2000 plan. PRI employees should consult their tax advisors concerning
their own United States federal income tax situations, as well as state, local
and foreign tax aspects of the acquisition of shares of PRI common stock
pursuant to the 2000 plan. No state, local or foreign tax matters are addressed
in the following discussion.

     If a PRI employee acquires shares under the 2000 plan and does not dispose
of them within two years after the commencement of the offering pursuant to
which the shares were acquired, nor within one year after the date on which the
shares were acquired, any gain realized upon subsequent disposition will be
taxable as a long-term capital gain, except that the portion of the gain equal
to the lesser of (a) the excess of the fair market value of the shares on the
date of disposition over the amount paid upon purchase of the shares, or (b) the
excess of the fair market value of the shares on the offering commencement date
over the amount paid upon purchase of the shares, is taxable as ordinary income.
There is no corresponding deduction for PRI, however. If the employee disposes
of the shares at a price less than the price at which he or she acquired the
shares, the employee realizes no ordinary income and has a long-term capital
loss measured by the difference between the purchase price and the selling
price.

     If, on the other hand, a PRI employee disposes of shares acquired pursuant
to the 2000 plan within two years after the commencement date of the offering
pursuant to which the shares were acquired, or within one year after the date on
which the shares were acquired, the difference between the purchase price and
the fair market value of the shares at the time of purchase will be taxable to
him or her as ordinary income in the year of disposition. In this event, PRI may
deduct from its gross income an amount

                                       148


equal to the amount treated as ordinary income by the employee. Any excess of
the selling price over the fair market value at the time the employee purchased
the shares will be taxable as long-term or short-term capital gain, depending
upon the period for which the shares were held. If any shares are disposed of
within either the two-year or one-year period at a price less than the fair
market value at the time of purchase, the same amount of ordinary income (i.e.,
the difference between the purchase price and the fair market value of the
shares at the time of purchase) is realized, and a capital loss is recognized
equal to the difference between the fair market value of the shares at the time
of purchase and the selling price.

     If a participating employee dies while owning shares acquired under the
2000 plan, ordinary income may be reportable on his or her final income tax
return.

     The 2000 plan is not subject to the provisions of the Employee Retirement
Income Security Act of 1974, nor is the plan qualified under Section 401(a) of
the Internal Revenue Code.

VOTE REQUIRED AND BOARD OF DIRECTORS RECOMMENDATION

     A majority of the votes properly cast on the proposal at the special
meeting is required to approve the amendment to the PRI 2000 employee stock
purchase plan.

     THE PRI BOARD OF DIRECTORS RECOMMENDS THAT PRI STOCKHOLDERS VOTE FOR
APPROVAL OF THE AMENDMENT TO THE PRI 2000 EMPLOYEE STOCK PURCHASE PLAN.

                                       149


                           PRI EXECUTIVE COMPENSATION

     The following table provides summary information concerning the
compensation earned by PRI's chief executive officer and each of its five other
most highly compensated executive officers for services rendered in all
capacities to PRI during fiscal 2001, 2000 and 1999. We refer to these
individuals as PRI's named executive officers.

                           SUMMARY COMPENSATION TABLE



                                                                                      LONG-TERM
                                                                                     COMPENSATION
                                                                                        AWARDS
                                                                                     ------------
                                                           ANNUAL COMPENSATION(1)     SECURITIES
                                                  FISCAL   -----------------------    UNDERLYING       ALL OTHER
          NAME AND PRINCIPAL POSITION              YEAR      SALARY       BONUS        OPTIONS      COMPENSATION(2)
          ---------------------------             ------   ----------   ----------   ------------   ---------------
                                                                                     
Mordechai Wiesler...............................   2001     $159,369           --       25,500         $  4,332
  Chairman of the Board of PRI                     2000     $188,100           --       40,000         $ 12,734
                                                   1999     $201,539           --       40,000         $ 12,360

Mitchell G. Tyson...............................   2001     $364,000           --       30,000         $  5,543
  President and Chief                              2000     $358,624           --       78,000         $  8,401
  Executive Officer of PRI                         1999     $266,010           --       55,000         $  5,412

Cosmo S. Trapani(3).............................   2001     $268,673     $112,800(4)    50,000         $  6,461
  Vice President and Chief                         2000     $145,750     $ 56,400(4)    57,000         $  5,894
  Financial Officer of PRI                         1999           --           --           --               --

Robert de Neve..................................   2001     $260,637     $ 90,000       46,000         $  6,455
  Vice President, General Manager,                 2000     $202,624     $  7,008       35,000         $  5,159
  OEM Systems Division of PRI                      1999     $160,769     $ 20,000       13,000         $  2,733

R. Brad Lawrence(5).............................   2001     $126,058           --       65,000         $ 38,013
  Vice President, General Manager,                 2000           --           --           --               --
  Factory Systems Division of PRI                  1999           --           --           --               --

Edward A. Wagner(6).............................   2001     $232,056     $411,580       15,000         $ 90,870
  Former Vice President, General Manager,          2000     $268,917     $139,100       80,000         $136,856
  Factory Systems Division of PRI                  1999     $204,346           --       39,000         $  6,528


---------------

(1) In accordance with the rules of the SEC, other annual compensation in the
    form of perquisites and other personal benefits has been omitted because
    those perquisites and other personal benefits constituted less than $50,000
    and less than ten percent of the total annual salary and bonus for each
    executive officer.

(2) The amounts reported include PRI's contributions to the PRI Savings and
    Retirement Plan during fiscal 2001, 2000 and 1999, respectively, for the
    benefit of Mr. Wiesler ($3,857, $4,670, and $4,800), Mr. Tyson ($4,800,
    $7,200, and $4,800), Mr. de Neve ($5,960, $4,673 and $2,386), and Mr. Wagner
    ($2,245, $7,110, and $4,800); during fiscal 2001 and 2000, respectively, for
    Mr. Trapani ($5,899 and $3,975); and during fiscal 2001 for Mr. Lawrence
    ($3,946); and premiums paid by PRI on excess life insurance policies during
    fiscal 2001, 2000 and 1999, respectively, for Mr. Wiesler ($475, $8,064 and
    $7,560), Mr. Tyson ($743, $1,201 and $612), Mr. de Neve ($495, $486 and
    $347), and Mr. Wagner ($167, $1,406, and $1,728); during fiscal 2001 and
    2000, respectively, for Mr. Trapani ($562 and $1,919); during fiscal 2001,
    for Mr. Lawrence ($274); and for temporary living expenses and relocation
    during fiscal 2001 and 2000 for Mr. Wagner ($88,458 and $128,340); and for
    relocation during fiscal 2001 for Mr. Lawrence ($33,793).

(3) Mr. Trapani joined PRI during fiscal 2000 and therefore received
    compensation for only a portion of that fiscal year.

(4) Under Mr. Trapani's at-will employment arrangement with PRI, in addition to
    being eligible for target bonuses, a portion of his annual compensation is
    payable in the form of a fixed payment of $28,200 per quarter for up to the
    first five years of his employment with PRI.

                                       150


(5) Mr. Lawrence joined PRI during fiscal 2001 and therefore received
    compensation for only a portion of that fiscal year.

(6) Mr. Wagner ceased to be an executive officer of PRI in March 2001.

DIRECTORS' COMPENSATION

     Each of PRI's non-employee directors has served without cash compensation
but has been reimbursed, upon request, for expenses incurred in attending
meetings of PRI's board of directors. PRI directors who are PRI employees are
not paid any separate fees for serving as directors.

     Before fiscal 2001, PRI's board of directors voted to automatically grant
annually on November 30 to each non-employee director then in office a
nonqualified option under PRI's 1997 Non-Incentive Stock Option Plan to purchase
5,000 shares of PRI common stock at an exercise price equal to its fair market
value on that date. Pursuant to this vote, on November 30, 2000, each of Messrs.
Rasiel, Frusztajer, d'Arbeloff and Thompson was automatically granted a
nonqualified option to purchase 5,000 shares of PRI common stock at an exercise
price of $17.81 per share. On June 19, 2001, PRI's board of directors voted to
increase the number of nonqualified options automatically granted each year from
5,000 to 10,000 shares. On that date, PRI's board of directors also voted to
grant each of Messrs. Rasiel, Frusztajer, d'Arbeloff and Thompson a nonqualified
option to purchase 5,000 shares of PRI common stock at an exercise price of
$14.90 per share and, thereafter, to grant Mr. Wiesler nonqualified options to
the same extent as PRI's non-employee directors. Pursuant to the foregoing
votes, on November 30, 2001, each of Messrs. Wiesler, Rasiel, Frusztajer,
d'Arbeloff, and Thompson was automatically granted a nonqualified option to
purchase 10,000 shares of PRI common stock at an exercise price of $18.71 per
share.

OPTION GRANTS IN LAST FISCAL YEAR

     The following table provides information concerning stock option grants
made by PRI during fiscal 2001 under its 1997 Non-Incentive Stock Option Plan
and its 2000 Stock Option Plan to its Chief Executive Officer and each of its
other named executive officers:

                       OPTION GRANTS IN LAST FISCAL YEAR



                                              INDIVIDUAL GRANTS
                             ---------------------------------------------------    POTENTIAL REALIZABLE
                                         % OF TOTAL                                VALUE AT ASSUMED ANNUAL
                                          OPTIONS                                   RATES OF STOCK PRICE
                                         GRANTED TO                                   APPRECIATION FOR
                                         EMPLOYEES                                     OPTION TERM(2)
                              OPTIONS    IN FISCAL    EXERCISE                     -----------------------
NAME                          GRANTED       YEAR      PRICE(1)   EXPIRATION DATE       5%          10%
----                         ---------   ----------   --------   ---------------   ----------   ----------
                                                                              
Mordechai Wiesler..........  10,500(3)     0.42%       $14.90       06/19/07        $ 53,208     $120,711
                             15,000(4)     0.60%       $17.75       10/23/06        $ 90,550     $205,428

Mitchell G. Tyson..........  30,000(4)     1.21%       $17.75       10/23/06        $181,101     $410,856

Cosmo S. Trapani...........  10,000(3)     0.40%       $14.90       06/19/07        $ 50,674     $114,963
                             40,000(4)     1.61%       $17.75       10/23/06        $241,468     $547,808

R. Brad Lawrence...........  60,000(5)     2.42%       $14.32       04/09/07        $292,210     $662,925
                              5,000(3)     0.20%       $14.90       06/19/07        $ 25,337     $ 57,481

Robert de Neve.............  10,000(3)     0.40%       $14.90       06/19/07        $ 50,674     $114,963
                             36,000(4)     1.45%       $17.75       10/23/06        $217,321     $493,027

Edward A. Wagner...........  15,000(4)     0.60%       $17.75       10/23/06        $ 90,550     $205,428


---------------

(1) All options were granted at exercise prices not less than fair market value,
    which was determined by PRI's board of directors to be the last sale price
    of the PRI common stock on the date of grant as reported by the Nasdaq Stock
    Market.

(2) Amounts reported in this column represent hypothetical values that may be
    realized upon exercise of the options immediately before the expiration of
    their term, assuming the specified compounded rates

                                       151


    of appreciation of PRI common stock over the term of the options. These
    numbers are calculated based on rules promulgated by the SEC and do not
    represent PRI's estimate of future stock price growth. Actual gains, if any,
    on stock option exercises and PRI common stock holdings depend on the timing
    of those exercises and the future performance of the PRI common stock. There
    can be no assurance that the rates of appreciation assumed in this table can
    be achieved or that the amounts reflected will be received by PRI's named
    executive officers. This table does not take into account any appreciation
    in price of the PRI common stock from the date of grant to the current date.
    The values shown are net of the option price, but do not include deductions
    for taxes or other expenses associated with the exercise.

(3) Options vest in 20 equal quarterly installments beginning 09/19/01 and
    ending 06/19/06.

(4) Options vest in 20 equal quarterly installments beginning 01/23/01 and
    ending 10/23/05.

(5) Options vest in 20 equal quarterly installments beginning 07/09/01 and
    ending 04/09/06.

OPTION EXERCISES AND FISCAL YEAR-END OPTION VALUES

     The following table provides information concerning option exercises and
holdings under PRI's 1994 Incentive and Nonqualified Stock Option Plan, 1997
Non-Incentive Stock Option Plan and 2000 Stock Option Plan as of September 30,
2001 by PRI's Chief Executive Officer and other named executive officers:

               OPTION EXERCISES AND FISCAL YEAR-END OPTION VALUES



                                                       COMMON STOCK UNDERLYING        VALUE OF UNEXERCISED
                                                       UNEXERCISED OPTIONS AT        IN-THE-MONEY OPTIONS AT
                          SHARES                           FISCAL YEAR-END             FISCAL YEAR-END(2)
                        ACQUIRED ON      VALUE       ---------------------------   ---------------------------
NAME                     EXERCISE     REALIZED(1)    EXERCISABLE   UNEXERCISABLE   EXERCISABLE   UNEXERCISABLE
----                    -----------   ------------   -----------   -------------   -----------   -------------
                                                                               
Mordechai Wiesler.....        --             --        117,675         81,225          --             --
Mitchell G. Tyson.....        --             --        169,220        156,500          --             --
Cosmo S. Trapani......        --             --         21,500         85,500          --             --
R. Brad Lawrence......        --             --          3,250         61,750          --             --
Robert de Neve........        --             --         55,011         85,600          --             --
Edward A. Wagner......     5,625        $77,906         29,250        101,998          --             --


---------------

(1) Amounts disclosed in this column do not necessarily reflect amounts received
    by PRI's named executive officers but are calculated based on the difference
    between the fair market value of the PRI common stock on the date of
    exercise and the exercise price of the options. PRI's named executive
    officers will receive cash only if and when they sell the stock issued upon
    exercise of the options, and the amount of cash received by those
    individuals depends on the price of the PRI common stock at the time of the
    sale.

(2) Calculated on the basis of the last sale price of the PRI common stock on
    September 28, 2001 as reported by the Nasdaq Stock Market ($10.02 per
    share), less the applicable option exercise price. No options were in the
    money as of September 30, 2001.

EMPLOYMENT AND RETENTION AGREEMENTS

     Mordechai Wiesler, PRI's Chairman of the Board, entered into an employment
agreement with PRI in July 2001. Mitchell G. Tyson, PRI's President and Chief
Executive Officer, entered into an employment agreement with PRI and Brooks in
October 2001 in connection with the execution of the merger agreement between
the two companies. Mr. Tyson's agreement will become effective only upon the
closing of the proposed merger between PRI and Brooks. Several of PRI's officers
and directors, including Mr. Wiesler, have retention agreements with PRI. This
section summarizes Mr. Wiesler's agreement and

                                       152


the retention agreements. For a summary of Mr. Tyson's employment agreement, see
"Related Agreements -- Employment Agreement with Mitchell G. Tyson."

     Mordechai Wiesler.  On July 5, 2001, Mordechai Wiesler, PRI's Chairman of
the Board, entered into an employment agreement with PRI. Under the agreement,
Mr. Wiesler is employed on an at-will basis as PRI's Chairman of the Board and
is required to perform duties and functions related to his position as PRI's
Chairman of the Board.

     Under the agreement, PRI agreed to pay Mr. Wiesler a base salary of
$100,000 per year. Mr. Wiesler is also entitled to participate in PRI's stock
option plans to the same extent as PRI's other non-employee directors and
participate in or receive benefits under PRI's employee benefit plans and
policies in effect from time to time for comparable employees of PRI, subject to
the applicable terms and conditions of the particular benefit plan.

     The agreement provides that Mr. Wiesler's employment with PRI will
terminate or may be terminated as follows:

     - upon Mr. Wiesler's death;

     - by PRI if Mr. Wiesler suffers a disability, which is defined as physical
       or mental incapacity that results in his inability to perform his duties
       for a period of six consecutive months;

     - voluntarily by Mr. Wiesler;

     - by Mr. Wiesler for good reason;

     - by PRI for cause; and

     - by PRI without cause.

     If Mr. Wiesler's employment is terminated by PRI for cause, he will be
entitled to receive his base salary only through the date of termination. All
other benefits owed to Mr. Wiesler following the termination of his employment
for cause will be determined in accordance with the plans, policies and
practices of PRI at the time of his termination. For purposes of the employment
agreement, cause means any of the following: Mr. Wiesler's willful and continued
failure substantially to perform his duties (other than as a result of total or
partial incapacity due to physical or mental illness), the willful commission by
Mr. Wiesler of acts that are dishonest and demonstrably injurious to PRI, or an
act or acts on Mr. Wiesler's part constituting a felony under the laws of the
United States or any state. To terminate Mr. Wiesler's employment for cause, PRI
must first provide Mr. Wiesler reasonable notice of and a reasonable opportunity
to be heard by the board of directors, a majority of the board must find in good
faith that an event constituting cause for termination has occurred, and PRI
must give Mr. Wiesler written notice of termination of his employment.

     If PRI terminates Mr. Wiesler's employment without cause (other than by
reason of disability or death), he will receive a lump sum payment of his base
salary through the date of termination at the rate in effect on the date of
termination, a severance payment of $100,000, and, in the case of compensation
previously deferred by Mr. Wiesler, if any, all amounts of such compensation
previously deferred and not yet paid by PRI. In addition, all options or other
awards issued under any of PRI's option plans will become fully vested and
exercisable as of the date of termination. Mr. Wiesler's benefits will continue
for twelve months after termination of his employment.

     If Mr. Wiesler terminates his employment with PRI for good reason, he will
be entitled to receive the same payments he would have received had his
employment been terminated by PRI without cause. For this purpose, good reason
means the assignment to Mr. Wiesler of duties and responsibilities inappropriate
for his position, any failure by PRI to reappoint him as Chairman of the Board,
a reduction in his compensation or benefits, the relocation of PRI's principal
offices to a location outside the metropolitan Boston, Massachusetts area, PRI's
requiring Mr. Wiesler to be based anywhere other than its current location in
Billerica, Massachusetts, PRI's failure to obtain the specific assumption of Mr.
Wiesler's

                                       153


employment agreement by any person or company acquiring PRI, or the occurrence
of an event after such an assignment of his agreement that he reasonably
believes will impair his rights under the agreement.

     Upon the closing of the proposed merger of PRI and Brooks, Mr. Wiesler will
cease to be Chairman of the Board of PRI. Brooks, PRI and Mr. Wiesler have
agreed that this event will constitute termination of his employment without
cause and for good reason. Accordingly, Mr. Wiesler will be entitled to receive
the severance payments and benefits described above for either such termination.

     Mr. Wiesler is also a party to a retention agreement with PRI, the terms of
which are discussed in detail below. Upon the closing of the proposed merger of
PRI and Brooks, under the terms of the retention agreement, Mr. Wiesler will
receive additional severance payments and benefits and his options to purchase
common stock will vest in full.

     Retention agreements.  PRI has entered into retention agreements with
approximately forty of its executives, including Mr. Wiesler, Mr. Tyson, Mr.
Trapani, Mr. de Neve and Mr. Lawrence. Mr. Tyson's retention agreement will be
superseded by his employment agreement described under "Related
Agreements -- Employment Agreement with Mitchell G. Tyson." Under these
retention agreements, PRI will provide severance payments and other benefits to
the executives if, within 12 months after a change of control of PRI, any of the
following events occurs:

     - the executive's employment is terminated other than for cause, as defined
       in the agreement; or

     - the executive resigns after a material reduction in his or her salary or
       benefits, after his relocation to a facility in a different location
       without his or her consent, or after one of several other specified
       events.

     The proposed merger with Brooks will constitute a change in control of PRI
under the retention agreements. Accordingly, if any of the foregoing events
happens after the merger, PRI will pay the affected executive a lump sum equal
to the executive's then-current annual base compensation, plus the bonus that
PRI paid the executive for the most recently completed fiscal year, plus a
pro-rated fraction of the executive's target bonus for the then-current fiscal
year. Each agreement also provides that, upon such termination or resignation,
or upon the first anniversary of a change of control of PRI if there has been no
such termination or resignation, all of the stock options held by the executive
will vest in full and become fully exercisable, and any rights PRI may have had
to repurchase any PRI stock owned by the executive will terminate.

     Severance agreement.  On March 30, 2001, Edward A. Wagner entered into an
agreement with PRI under which he ceased to serve as PRI's Vice President and
General Manager, Factory Systems Division, and became a special assistant to the
chief executive officer for a term ending May 9, 2002 at a bi-weekly salary of
$1,536. If Mr. Wagner's employment is involuntarily terminated, PRI will
continue to pay his compensation until May 9, 2002. While employed, Mr. Wagner's
stock options will generally continue to vest, and he is entitled to participate
in any employee medical and dental insurance programs. The agreement also
provides that, in recognition of his past contributions, Mr. Wagner will receive
four equal quarterly payments of $59,500. The agreement also extended the term
of Mr. Wagner's non-competition obligations to PRI to March 30, 2004.

COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION

     No member of PRI's Compensation Committee is a former or current employee
of PRI or a party to any other relationship of a character required to be
disclosed pursuant to Item 402(j) of Regulation S-K.

                                       154


                                    EXPERTS

     The audited financial statements incorporated in this joint proxy
statement/prospectus by reference to the annual report on Form 10-K/A of Brooks
Automation, Inc. for the year ended September 30, 2001, except as they relate to
Irvine Optical Company, LLC as of December 31, 1999 and for the year ended
December 31, 1999, have been so incorporated in reliance on the report of
PricewaterhouseCoopers LLP, independent accountants, given on the authority of
said firm as experts in auditing and accounting.

     The financial statements of PRI Automation, Inc. incorporated in this joint
proxy statement/prospectus by reference to PRI Automation, Inc.'s annual report
on Form 10-K/A for the year ended September 30, 2001 have been so incorporated
in reliance on the report of PricewaterhouseCoopers LLP, independent
accountants, given on the authority of said firm as experts in auditing and
accounting.

     The audited financial statements of General Precision, Inc., incorporated
in this joint proxy statement/prospectus by reference to Brooks Automation,
Inc.'s current report on Form 8-K/A filed April 4, 2002, have been so
incorporated in reliance on the report of PricewaterhouseCoopers LLP,
independent accountants, given on the authority of said firm as experts in
auditing and accounting.

     Ernst & Young LLP, independent auditors, have audited the financial
statements of Irvine Optical Company, LLC as of December 31, 1999 and 1998, and
for the years then ended, as set forth in their report (which contains an
explanatory paragraph describing conditions that raise substantial doubt about
Irvine Optical Company, LLC's ability to continue as a going concern as
described in Note 1 to those financial statements). Brooks has incorporated by
reference Ernst & Young LLP's report with respect to Irvine Optical Company,
LLC's financial statements in this joint proxy statement/prospectus and
elsewhere in the registration statement in reliance on Ernst & Young LLP's
report, given on their authority as experts in accounting and auditing.

                                 LEGAL MATTERS

     The validity of the shares of Brooks common stock to be issued pursuant to
the merger will be passed upon for Brooks by Brown Rudnick Berlack Israels LLP,
Boston, Massachusetts. Members of Brown Rudnick Berlack Israels LLP are the
secretary and the assistant secretaries of Brooks. Ropes & Gray, Boston,
Massachusetts, is acting as counsel for Brooks in connection with tax matters
relating to the merger. Foley, Hoag & Eliot LLP, Boston, Massachusetts, is
acting as counsel for PRI in connection with certain legal matters relating to
the merger. A member of Foley, Hoag & Eliot is the clerk of PRI and beneficially
owns 3,000 shares of PRI common stock. Blake, Cassels & Graydon LLP, Toronto,
Ontario, Canada is acting as counsel for PRI in connection with matters of
Canadian law relating to the merger.

                                       155


                      WHERE YOU CAN FIND MORE INFORMATION

     Brooks has filed a registration statement on Form S-4 to register with the
SEC the Brooks common stock to be issued to PRI stockholders in the merger. This
joint proxy statement/prospectus is a part of that registration statement and
constitutes a prospectus of Brooks as well as proxy statement of both Brooks and
PRI for their respective stockholders' meetings. As allowed by SEC rules, this
joint proxy statement/prospectus does not contain all the information you can
find in the registration statement or the exhibits to the registration
statement.

     In addition, Brooks and PRI file annual, quarterly, and current reports,
proxy statements and other information with the SEC under the Securities
Exchange Act of 1934. You may read and copy this information at the following
locations of the SEC:


                                                        
Public Reference Room          Midwest Regional Office        Northeast Regional Office
450 Fifth Street, NW           Citicorp Center                233 Broadway
Room 1024                      500 West Madison Street        New York, NY 10279
Washington, DC 20549           Suite 1400
                               Chicago, IL 60661


     You may also obtain copies of this information by mail from the Public
Reference Room of the SEC, 450 Fifth Street, NW, Room 1024, Washington, DC
20549, at prescribed rates. Please call the SEC at 1-800-SEC-0330 for further
information on the public reference room. The SEC also maintains a World Wide
Web site that contains reports, proxy statements and other information about
issuers, including Brooks and PRI, who file electronically with the SEC. The
address of that site is http://www.sec.gov.

     The SEC allows us to incorporate by reference information into this joint
proxy statement/prospectus. This means that we can disclose important
information to you by referring you to another document filed separately with
the SEC. The information incorporated by reference is considered to be a part of
this joint proxy statement/prospectus, except for any information that is
superseded by information that is filed at a later date.

     This joint proxy statement/prospectus incorporates by reference the
documents listed below that Brooks and PRI have previously filed with the SEC.
They contain important information about our companies and their financial
condition.

     BROOKS SEC FILINGS (FILE NO. 000-25434)

     - Brooks' annual report on Form 10-K/A for the fiscal year ended September
       30, 2001;

     - Brooks' current report on Form 8-K filed on October 19, 2001;

     - Brooks' current report on Form 8-K filed on October 22, 2001;

     - Brooks' current report on Form 8-K filed on February 7, 2002;

     - Brooks' current report on Form 8-K filed on March 1, 2002;

     - Brooks' current report on Form 8-K/A filed on April 4, 2002;

     - Brook's quarterly report on Form 10-Q/A for the quarter ended December
       31, 2001;

     - the description of Brooks common stock that is contained in Brooks'
       registration statement on Form 8-A filed on January 27, 1995; and

     - the description of our preferred share rights that is contained in our
       registration statement on Form 8-A filed on August 7, 1997.

     PRI SEC FILINGS (FILE NO. 000-24934)

     - PRI's annual report on Form 10-K/A for the fiscal year ended September
       30, 2001;

     - PRI's current report on Form 8-K filed October 26, 2001;

                                       156


     - PRI's current report on Form 8-K filed November 1, 2001; and

     - PRI's quarterly report on Form 10-Q/A for the quarter ended December 30,
       2001.

     We incorporate by reference additional documents that either company may
file with the SEC pursuant to Section 13(a), 13(c), 14 or 15(d) of the Exchange
Act between the date of this joint proxy statement/prospectus and the later of
the two stockholders' meetings. These documents include periodic reports,
including annual reports on Form 10-K, quarterly reports on Form 10-Q and
current reports on Form 8-K, as well as proxy statements.

     You can obtain any of the documents incorporated by reference in this joint
proxy statement/prospectus from the SEC through the SEC's Internet site at the
address provided above. Documents incorporated by reference are also available
from Brooks or PRI, as the case may be, without charge, excluding any exhibits
to those documents unless the exhibit is specifically incorporated by reference
in this joint proxy statement/prospectus. You can obtain these documents by
requesting them in writing or by telephone from the appropriate company at the
following addresses:


                                    
       Brooks Automation, Inc.                  PRI Automation, Inc.
          Investor Relations                     Investor Relations
          15 Elizabeth Drive                   805 Middlesex Turnpike
   Chelmsford, Massachusetts 01824         Billerica, Massachusetts 01821
        Phone: (978) 262-5799                  Phone: (978) 670-4270


     IF YOU WOULD LIKE TO REQUEST DOCUMENTS FROM EITHER COMPANY, PLEASE DO SO BY
MAY 6, 2002 IN ORDER TO RECEIVE THEM BEFORE YOUR COMPANY'S STOCKHOLDERS'
MEETING.

     If you request any incorporated documents from us, we will mail them to you
by first class mail, or another equally prompt means, within one business day
after we receive your request.

     WE HAVE NOT AUTHORIZED ANYONE TO GIVE ANY INFORMATION OR MAKE ANY
REPRESENTATION ABOUT THE MERGER OF OUR COMPANIES THAT DIFFERS FROM, OR ADDS TO,
THE INFORMATION IN THIS JOINT PROXY STATEMENT/PROSPECTUS OR IN THE DOCUMENTS
THAT WE PUBLICLY FILE WITH THE SEC. THEREFORE, IF ANYONE GIVES YOU DIFFERENT OR
ADDITIONAL INFORMATION, YOU SHOULD NOT RELY ON IT.

     IF YOU ARE IN A JURISDICTION WHERE IT IS UNLAWFUL TO OFFER TO EXCHANGE OR
SELL, OR TO ASK FOR OFFERS OF EXCHANGE OR TO BUY, THE SECURITIES OFFERED BY THIS
JOINT PROXY STATEMENT/PROSPECTUS OR TO ASK FOR PROXIES, OR IF YOU ARE A PERSON
TO WHOM IT IS UNLAWFUL TO DIRECT THESE ACTIVITIES, THEN THE OFFER PRESENTED BY
THIS JOINT PROXY STATEMENT/PROSPECTUS DOES NOT EXTEND TO YOU.

     THE INFORMATION CONTAINED IN THIS JOINT PROXY STATEMENT/PROSPECTUS SPEAKS
ONLY AS OF ITS DATE UNLESS THE INFORMATION SPECIFICALLY INDICATES THAT ANOTHER
DATE APPLIES. INFORMATION ABOUT BROOKS HAS BEEN SUPPLIED BY BROOKS, AND
INFORMATION ABOUT PRI HAS BEEN SUPPLIED BY PRI.

                                       157


                                                                      APPENDIX A
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------

                              AMENDED AND RESTATED
                          AGREEMENT AND PLAN OF MERGER
                                     AMONG
                            BROOKS AUTOMATION, INC.,
                             PRI AUTOMATION, INC.,
                                      AND
                           PONTIAC ACQUISITION CORP.
                         DATED AS OF: DECEMBER 18, 2001

--------------------------------------------------------------------------------
--------------------------------------------------------------------------------


                               TABLE OF CONTENTS



                                                               PAGE
                                                               ----
                                                            
Article I. DEFINITIONS......................................    A-2
Article II. THE MERGERS.....................................    A-9
     Section 2.1   Procedure for the Mergers................    A-9
     Section 2.2   First Surviving Corporation..............    A-9
     Section 2.3   Second Surviving Corporation.............    A-9
     Section 2.4   Closing..................................    A-9
     Section 2.5   Effective Time...........................    A-9
     Section 2.6   Articles of Organization and Bylaws of
      the First Surviving Corporation.......................   A-10
     Section 2.7   Certificate of Incorporation and Bylaws
      of the Second Surviving Corporation...................   A-10
     Section 2.8   Board of Directors of Brooks.............   A-10
     Section 2.9   Name of Brooks...........................   A-10
     Section 2.10  Reservation of Right to Revise
      Transaction...........................................   A-10
     Section 2.11  Waiver...................................   A-11
Article III. EFFECT OF THE MERGERS ON THE CAPITAL STOCK OF
  THE CONSTITUENT CORPORATIONS; EXCHANGE OF CERTIFICATES....   A-11
     Section 3.1   Effect of First Merger on Capital
      Stock.................................................   A-11
     Section 3.2   Dissenting Shares........................   A-11
     Section 3.3   Exchange of Certificates.................   A-12
     Section 3.4   Options and Warrants.....................   A-14
     Section 3.5   Certain Adjustments......................   A-14
     Section 3.6   Effect of Second Merger on Capital
      Stock.................................................   A-15
Article IV. REPRESENTATIONS AND WARRANTIES OF BROOKS........   A-15
     Section 4.1   Organization; Standing and Corporate
      Power.................................................   A-15
     Section 4.2   Subsidiaries.............................   A-15
     Section 4.3   Capitalization...........................   A-15
     Section 4.4   Authorization of Transaction.............   A-17
     Section 4.5   No Conflict of Transaction With
      Obligations and Laws..................................   A-17
     Section 4.6   Present Compliance with Obligations and
      Laws..................................................   A-18
     Section 4.7   Brooks SEC Reports.......................   A-18
     Section 4.8   Information Supplied.....................   A-19
     Section 4.9   Absence of Undisclosed Liabilities.......   A-19
     Section 4.10  Absence of Certain Changes...............   A-20
     Section 4.11  Payment of Taxes.........................   A-20
     Section 4.12  Certain Contracts........................   A-21
     Section 4.13  Legal Proceedings........................   A-21
     Section 4.14  ERISA and Employee Benefits..............   A-22
     Section 4.15  Intellectual Property....................   A-23
     Section 4.16  Environmental Matters....................   A-25
     Section 4.17  Labor Matters............................   A-25
     Section 4.18  Brokers..................................   A-25
     Section 4.19  Opinion of Financial Advisor.............   A-26
     Section 4.20  Ownership of PRI Common Stock............   A-26
     Section 4.21  Section 203 of the DGCL Not Applicable...   A-26


                                       A-i




                                                               PAGE
                                                               ----
                                                            
     Section 4.22  Rights Agreement.........................   A-26
     Section 4.23  Brooks Action............................   A-26
     Section 4.24  Certain Tax Matters......................   A-27
     Section 4.25  Compliance with Investment Company Act...   A-27
Article V. REPRESENTATIONS AND WARRANTIES OF PRI............   A-27
     Section 5.1   Organization; Standing and Corporate
      Power.................................................   A-27
     Section 5.2   Subsidiaries.............................   A-27
     Section 5.3   Capitalization...........................   A-28
     Section 5.4   Authorization of Transaction.............   A-29
     Section 5.5   No Conflict of Transaction With
      Obligations and Laws..................................   A-29
     Section 5.6   Present Compliance with Obligations and
      Laws..................................................   A-30
     Section 5.7   PRI SEC Reports..........................   A-30
     Section 5.8   Information Supplied.....................   A-31
     Section 5.9   Absence of Undisclosed Liabilities.......   A-31
     Section 5.10  Absence of Certain Changes...............   A-31
     Section 5.11  Payment of Taxes.........................   A-32
     Section 5.12  Certain Contracts........................   A-33
     Section 5.13  Legal Proceedings........................   A-33
     Section 5.14  Employee Benefits........................   A-34
     Section 5.15  Intellectual Property....................   A-35
     Section 5.16  Environmental Matters....................   A-37
     Section 5.17  Labor Matters............................   A-38
     Section 5.18  Brokers..................................   A-38
     Section 5.19  Opinion of Financial Advisor.............   A-38
     Section 5.20  Ownership of Brooks Common Stock.........   A-38
     Section 5.21  Antitakeover Laws........................   A-38
     Section 5.22  Rights Agreement.........................   A-39
     Section 5.23  PRI Action...............................   A-39
     Section 5.24  Product Warranties; Product Liability....   A-39
     Section 5.25  Certain Tax Matters......................   A-39
     Section 5.26  Compliance with Investment Company Act...   A-39
Article VI. REPRESENTATIONS AND WARRANTIES RELATED TO BROOKS
  MERGER SUB................................................   A-39
     Section 6.1   Organization.............................   A-39
     Section 6.2   Capitalization...........................   A-40
     Section 6.3   Authorization of Transaction.............   A-40
Article VII. COVENANTS RELATING TO CONDUCT OF BUSINESS......   A-40
     Section 7.1   Conduct of Business by Brooks............   A-40
     Section 7.2   Conduct of Business by PRI...............   A-42
     Section 7.3   No Solicitation by PRI...................   A-44
Article VIII. ADDITIONAL AGREEMENTS.........................   A-46
     Section 8.1   Preparation of Registration Statement and
                   the Joint Proxy Statement/ Prospectus;
                   Stockholders Meetings....................   A-46
     Section 8.2   Letters of PRI's Accountants.............   A-47
     Section 8.3   Letters of Brooks' Accountants...........   A-47


                                       A-ii




                                                               PAGE
                                                               ----
                                                            
     Section 8.4   Access to Information; Confidentiality...   A-48
     Section 8.5   Best Efforts.............................   A-48
     Section 8.6   Indemnification, Exculpation and
      Insurance.............................................   A-48
     Section 8.7   Fees and Expenses........................   A-49
     Section 8.8   Public Announcements.....................   A-50
     Section 8.9   Stock Listing............................   A-50
     Section 8.10  Tax Treatment............................   A-50
     Section 8.11  Conveyance Taxes.........................   A-50
     Section 8.12  Restraints...............................   A-50
     Section 8.13  Section 16 Matters.......................   A-50
     Section 8.14  Benefit Plans............................   A-51
Article IX. CONDITIONS PRECEDENT............................   A-51
     Section 9.1   Conditions to Each Party's Obligation to
      Effect the Mergers....................................   A-51
     Section 9.2   Conditions to Obligations of Brooks......   A-52
     Section 9.3   Conditions to Obligations of PRI.........   A-53
     Section 9.4   Frustration of Closing Conditions........   A-53
Article X. TERMINATION, AMENDMENT AND WAIVER................   A-53
     Section 10.1  Termination..............................   A-53
     Section 10.2  Effect of Termination....................   A-54
     Section 10.3  Amendment................................   A-54
     Section 10.4  Extension; Waiver........................   A-55
     Section 10.5  Procedure for Termination, Amendment,
      Extension or Waiver...................................   A-55
Article XI. GENERAL PROVISIONS..............................   A-55
     Section 11.1   Nonsurvival of Representations and
      Warranties............................................   A-55
     Section 11.2   Notices.................................   A-55
     Section 11.3   Interpretation..........................   A-56
     Section 11.4   Counterparts............................   A-56
     Section 11.5   Entire Agreement; No Third-Party
      Beneficiaries.........................................   A-56
     Section 11.6   Governing Law...........................   A-56
     Section 11.7   Assignment..............................   A-56
     Section 11.8   Consent to Jurisdiction.................   A-57
     Section 11.9   Headings................................   A-57
     Section 11.10  Severability............................   A-57


                                      A-iii


                              AMENDED AND RESTATED
                          AGREEMENT AND PLAN OF MERGER

     AMENDED AND RESTATED AGREEMENT AND PLAN OF MERGER (this "Agreement") dated
as of December 18, 2001, among Brooks Automation, Inc., a Delaware corporation
("BROOKS"), Pontiac Acquisition Corp., a Massachusetts corporation ("BROOKS
MERGER SUB"), and PRI Automation, Inc., a Massachusetts corporation ("PRI").

                                   RECITALS:

     WHEREAS, Brooks, Brooks Merger Sub and PRI entered into an Agreement and
Plan of Merger dated as of October 23, 2001 (the "Original Merger Agreement")
and now desire pursuant to Section 10.3 of the Original Merger Agreement to
amend and restate the Original Merger Agreement to reflect that, in accordance
with Section 2.8 of the Original Merger Agreement, Brooks, Brooks Merger Sub and
PRI have agreed to change the method of effecting the business combination among
Brooks, Brooks Merger Sub and PRI as provided herein (it being understood that
all references herein to "this Agreement" refer to the Original Merger Agreement
as amended and restated hereby and that all references herein to "the date
hereof", "the date of this Agreement", "presently" or similar phrases refer to
October 23, 2001);

     WHEREAS, Brooks, Brooks Merger Sub and PRI desire to effectuate a business
combination of PRI and Brooks by using a two-step approach as further described
in this Agreement;

     WHEREAS, to effectuate this combination, Brooks Merger Sub, a wholly owned
subsidiary of Brooks, will be merged with and into PRI (the "FIRST MERGER") and
PRI will immediately thereafter (and in any event no later than the time the
Secretary of State of the Commonwealth of Massachusetts shall close for business
on the day the First Merger shall be consummated) be merged with and into Brooks
(the "SECOND MERGER", and together with the First Merger, the "MERGERS") and the
stockholders of PRI will receive Brooks Common Stock upon the terms and subject
to the conditions set forth in this Agreement and in accordance with the
provisions of the Massachusetts Business Corporation Law (the "MBCL");

     WHEREAS, the respective Boards of Directors of Brooks and PRI have each
determined that the Mergers and the other transactions contemplated hereby are
consistent with, and in furtherance of, their respective business strategies and
goals and are in the best interests of their respective stockholders;

     WHEREAS, the respective Boards of Directors of Brooks and PRI have approved
the Mergers, upon the terms and subject to the conditions set forth in this
Agreement;

     WHEREAS, as a condition to the willingness of the parties hereto to enter
into the Original Merger Agreement and as an inducement to the parties to do so,
contemporaneous with the delivery of the Original Merger Agreement, certain
holders of the capital stock of each of Brooks and PRI entered into Voting
Agreements in the form of Exhibits 4.23A and 5.23A, which provide for certain
actions related to the transactions contemplated hereby, including the agreement
of those holders to vote in favor of the approval and adoption of this
Agreement;

     WHEREAS, for federal income tax purposes, it is intended that the Mergers
will qualify as a single reorganization transaction under the provisions of
Section 368 of the Code and this Agreement shall be, and hereby is, adopted as a
plan of reorganization for purposes of Section 368 of the Code; and

     WHEREAS, Brooks, Brooks Merger Sub and PRI desire to make certain
representations, warranties, covenants and agreements in connection with the
Mergers and also to prescribe various conditions to the consummation of the
Mergers;

                                       A-1


     NOW, THEREFORE, in consideration of the representations, warranties,
covenants and agreements contained in this Agreement, the parties agree as
follows:

                             ARTICLE I. DEFINITIONS

     For purposes of this Agreement, the following terms have the meanings
specified or referred to in this Article:

     "AFFILIATE" of a person means another person that directly or indirectly,
through one or more intermediaries, controls, is controlled by, or is under
common control with, such first person, where "control" means the possession,
directly or indirectly, of the power to direct or cause the direction of the
management policies of a person, whether through the ownership of voting
securities, by contract, as trustee or executor, or otherwise.

     "AGREEMENT" -- this Agreement, including the Schedules and Exhibits hereto.

     "AMENDED MRRS DECISION DOCUMENT" means that MRRS Decision Document dated
February 1, 1999 issued by the Canadian Regulators, amended if and as necessary
in the opinion of counsel to PRI Canada to give effect to the issuance of Brooks
Common Stock instead of PRI Common Stock.

     "AMENDED SUPPORT AGREEMENT" means the Support Agreement dated March 2, 1999
by and among PRI, PRI Canada and PRI Subco, as supplemented in accordance with
its terms to give effect to the terms of the Mergers, to add Brooks in place of
PRI and to give effect to the issuance of Brooks Common Stock to holders of PRI
Exchangeable Shares instead of PRI Common Stock.

     "AMENDED VOTING AND EXCHANGE TRUST AGREEMENT" means the Voting and Exchange
Trust Agreement dated as of March 2, 1999 by and among PRI, PRI Subco, PRI
Canada and Montreal Trust Company of Canada, as supplemented in accordance with
its terms to give effect to the terms of the Mergers, to add Brooks in place of
PRI and to give effect to the issuance of Brooks Common Stock to holders of PRI
Exchangeable Shares instead of PRI Common Stock.

     "ANCILLARY AGREEMENTS" -- the Voting Agreements contemplated by Sections
4.23 and 5.23 and the Employment Agreement contemplated by Section 5.23.

     "BROOKS" -- as defined in the Recitals.

     "BROOKS COMMON STOCK" -- the Common Stock, $.01 par value, of Brooks.

     "BROOKS INTELLECTUAL PROPERTY ASSETS" -- as defined in Section 4.15

     "BROOKS LATEST FORM 10-Q" -- as defined in Section 4.7.

     "BROOKS MATERIAL CONTRACTS" -- as defined in Section 4.12.

     "BROOKS MERGER SUB" -- as defined in the Recitals.

     "BROOKS MERGER SUB COMMON STOCK" -- as defined in Section 6.2.

     "BROOKS OPTIONS" means any options granted by Brooks to purchase its Common
Stock pursuant to its stock option plans or otherwise.

     "BROOKS PREFERRED STOCK" -- as defined in Section 4.3.

     "BROOKS RIGHTS" has the same meaning as the term "Rights" under the Brooks
Rights Plan.

     "BROOKS RIGHTS PLAN" means the Rights Agreement dated as of July 23, 1997
between Brooks and Boston Equiserve Trust Company, N.A. (successor in interest
to BankBoston, N.A.), as amended to date.

     "BROOKS SEC REPORTS" -- as defined in Section 4.7.

     "BROOKS SPECIAL VOTING SHARE" means the share of Special Voting Preferred
Stock to be authorized by the Certificate of Incorporation of Brooks having the
same rights, privileges, restrictions and conditions

                                       A-2


relative to the Brooks Common Stock as the PRI Special Voting Stock has relative
to the PRI Common Stock and having that number of votes equal to the number of
shares of Brooks Common Stock that holders of PRI Exchangeable Shares would
receive as a result of the Mergers if they held shares of PRI Common Stock.

     "BROOKS STOCKHOLDER APPROVAL" -- as defined in Section 4.4.

     "BROOKS STOCKHOLDERS MEETING" -- as defined in Section 8.1.

     "BROOKS WARRANTS" means any warrants granted by Brooks to purchase its
Common Stock.

     "CANADIAN REGULATORS" -- as defined in Section 4.5.

     "CLOSING" -- as defined in Section 2.4.

     "CLOSING DATE" -- the date and time on which the Closing actually takes
place.

     "CODE" -- the Internal Revenue Code of 1986, as amended, or any successor
law.

     "COMPANY SHARES" -- as defined in Section 3.3.

     "CONFIDENTIALITY AGREEMENT" -- the Mutual Confidentiality and No-Shop
Agreement, dated November 13, 2000 between Brooks and PRI.

     "CONVERTED SHARES" -- as defined in Section 3.3.

     "DGCL" means the General Corporation Law of the State of Delaware.

     "DISCLOSURE SCHEDULE" -- the disclosure schedule delivered by each of
Brooks and Brooks Merger Sub to PRI, and by PRI to Brooks and Brooks Merger Sub,
concurrently with the execution and delivery of the Original Merger Agreement.

     "EFFECTIVE TIME" -- as defined in Section 2.5(a).

     "EMPLOYEE BENEFIT PLAN" means any "employee benefit plan" as defined in
Section 3(3) of ERISA and any other plan, policy, program, practice, agreement,
understanding or arrangement (whether written or oral) providing compensation,
severance, insurance coverage or other benefits (other than ordinary cash
compensation) to any current or former director, officer, current or former
employee or consultant (or to any dependent or beneficiary thereof), of either
of Brooks or PRI, as applicable, or its Subsidiaries, which are now, or were
within the past five years, maintained by either Brooks or PRI or its respective
Subsidiaries or ERISA Affiliate, or under which it has or could have any
obligation or liability, whether actual or contingent, including, without
limitation, all incentive, bonus, deferred compensation, vacation, holiday,
cafeteria, medical, disability, stock purchase, stock option, stock
appreciation, phantom stock, restricted stock or other stock-based compensation
plans, policies, programs, practices or arrangements.

     "ENCUMBRANCE" -- any mortgage, charge, claim, community property interest,
equitable interest, lien, option, pledge, security interest, right of first
refusal or restriction of any kind, including any restriction on use, voting,
transfer, receipt of income or exercise of any other attribute of ownership; and
the verb "ENCUMBER" shall be construed accordingly.

     "ENVIRONMENTAL CLAIM" -- any accusation, allegation, notice of violation,
action, claim, Encumbrance, Lien, demand, abatement or other Order or direction
(conditional or otherwise) by any Governmental Authority or any Person for
personal injury (including sickness, disease or death), tangible or intangible
property damage, damage to the environment, nuisance, pollution, contamination
or other adverse effects on the environment, or for fines, penalties or
restrictions resulting from or based upon (a) the existence, or the continuation
of the existence, of a Release (including, without limitation, sudden or
non-sudden accidental or non-accidental Releases) of, or exposure to, any
Hazardous Material or other substance, clinical material, pollutant,
contaminant, odor, audible noise, or other Release in, into or onto the
environment (including, without limitation, the air soil, soil, surface water or
groundwater) at, in, by, from or related to the Facilities or any activities
conducted thereon; (b) the environmental aspects of the transportation, storage,
treatment or disposal of Hazardous Materials in connection with the operation of

                                       A-3


the Facilities; or (c) the violation, or alleged violation, of any Environmental
Laws, Orders or Governmental Permits of or from any Governmental Authority
relating to environmental matters connected with the Facilities.

     "ENVIRONMENTAL, HEALTH, AND SAFETY LIABILITIES" -- any cost, damage,
expense, liability, obligation or other responsibility arising from or under any
Environmental Law or Occupational Safety and Health Law and consisting of or
relating to: (a) any environmental, health or safety matter or condition
(including on-site or off-site contamination, generation, handling and disposal
of Hazardous Materials, occupational safety and health, and regulation of
chemical and Hazardous Materials); (b) fines, penalties, judgments, awards,
settlements, legal or administrative proceedings, damages, losses, litigation,
including civil and criminal claims, demands and responses, investigative,
remedial, response or inspection costs and expenses arising under Environmental
Law or Occupational Safety and Health Law; (c) financial responsibility under
Environmental Law or Occupational Safety and Health Law for cleanup costs or
corrective action, including any investigation, cleanup, removal, containment or
other remediation or response actions required by applicable Environmental Law
or Occupational Safety and Health Law and for any natural resource damages; or
(d) any other compliance, corrective, investigative or remedial measures
required under Environmental Law or Occupational Safety and Health Law. The
terms "removal," "remedial," and "response action," include the types of
activities covered by the United States Comprehensive Environmental Response,
Compensation, and Liability Act, 42 U.S.C. sec. 9601 et seq., as amended
("CERCLA").

     "ENVIRONMENTAL LAW" -- any Law concerning the environment, or activities
that might threaten or result in damage to the environment or human health, or
any Law that is concerned in whole or in part with the environment and with
protecting or improving the quality of the environment and human and employee
health and safety and includes, but is not limited to, CERCLA, the Hazardous
Materials Transportation Act (49 U.S.C. sec. 1801 et seq.), the Resource
Conservation and Recovery Act (42 U.S.C. sec. 6901 et seq.), the Clean Water Act
(33 U.S.C. sec. 1251 et seq.), the Clean Air Act (33 U.S.C. sec. 7401 et seq.),
the Toxic Substances Control Act (15 U.S.C. sec. 2601 et seq.), the Federal
Insecticide, Fungicide, and Rodenticide Act (7 U.S.C. sec. 136 et seq.) and the
Occupational Safety and Health Act (29 U.S.C. sec. 651 et seq.) ("OSHA"), as
such laws have been amended or supplemented, and the regulations promulgated
pursuant thereto, and any and all analogous state or local statutes, and the
regulations promulgated pursuant thereto.

     "ERISA" -- the Employee Retirement Income Security Act of 1974, as amended.

     "ERISA AFFILIATE" means any entity (whether or not incorporated) other than
Brooks or PRI, as applicable, or its Subsidiaries that, together with it or its
Subsidiaries, is a member of (a) a controlled group of corporations within the
meaning of Section 414(b) of the Code; (b) a group of trades or businesses under
common control within the meaning of Section 414(c) of the Code; or (c) an
affiliated service group within the meaning of Section 414(m) of the Code.

     "EXCHANGE ACT" -- the Securities Exchange Act of 1934, as amended, or any
successor law.

     "EXCHANGE AGENT" -- as defined in Section 3.3(a).

     "EXCHANGE RATIO" -- as defined in Section 3.1.

     "FACILITIES" -- any real property, leaseholds or other interests currently
(or, for purposes of Section 4.16 and 5.16 only, formerly) owned or operated by
a party hereto or any Subsidiary thereof, and any buildings, plants, structures
or equipment (including motor vehicles) currently or formerly owned or operated
by a party hereto or any Subsidiary thereof.

     "FIRST MERGER" -- as defined in the Recitals.

     "FIRST SURVIVING CORPORATION" -- as defined in Section 2.2.

     "GAAP" -- United States generally accepted accounting principles.

                                       A-4


     "GOVERNMENTAL AUTHORITY" -- any court, tribunal, authority, agency,
commission, bureau, department, official or other instrumentality of the United
States, any foreign country or any domestic, foreign, regional, state, local,
county, city or other political subdivision.

     "GOVERNMENTAL PERMIT" -- any license, franchise, permit or other
authorization of any Governmental Authority.

     "HAZARDOUS MATERIALS" -- any substance, material or waste which is
regulated by Environmental Law, including, without limitation, any material or
substance which is defined as a "hazardous waste," "hazardous material,"
"hazardous substance," "extremely hazardous waste" or "restricted hazardous
waste," "subject waste," "contaminant," "toxic waste" or "toxic substance" under
any provision of Environmental Law, including but not limited to, petroleum
products, asbestos and polychlorinated biphenyls.

     "HSR ACT" -- the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as
amended, or any successor law.

     "JOINT PROXY STATEMENT/PROSPECTUS" -- as defined in Section 8.1.

     "KNOWLEDGE" -- of any Person which is not an individual means the actual
knowledge, without investigation, of such Person's executive officers or senior
management of such Person's operating divisions and segments.

     "LAW" -- any federal, state, local or foreign law (including common law),
statute, code, ordinance, rule, regulation or other requirement or guideline.

     "LIEN" -- any lien, pledge, hypothecation, levy, mortgage, deed of trust,
security interest, claim, lease, charge, option, right of first refusal,
easement, or other real estate declaration, covenant, condition, restriction or
servitude, transfer restriction under any shareholder or similar agreement,
encumbrance or any other restriction or limitation whatsoever.

     "MBCL" -- as defined in the Recitals.

     "MARKET VALUE" -- as defined in Section 3.3.

     "MATERIAL ADVERSE CHANGE" or "MATERIAL ADVERSE EFFECT" means, when used in
connection with PRI or Brooks, any change, effect, event, occurrence or state of
facts that is, or would reasonably be expected to be, materially adverse to the
business, financial condition or results of operations of such party and its
Subsidiaries, taken as a whole, other than any such change, effect, event,
occurrence or state of facts (a) relating to general economic, regulatory or
political conditions, except to the extent such change, effect, event,
occurrence or state of facts disproportionately affects such party and its
Subsidiaries, taken as a whole, (b) relating to the semiconductor capital
equipment industry, the flat panel display manufacturing equipment industry, or
the data storage industry generally, except to the extent such change, effect,
event, occurrence or state of facts disproportionately affects such party and
its Subsidiaries, taken as a whole, (c) relating to any change in the trading
price of the common stock of such party or (d) relating to any
reduction-in-force. A failure by a party to meet the revenue, earnings or
bookings predictions of equity analysts as reflected in the First Call consensus
estimate or any other revenue, earnings or bookings predictions, including
internal management predictions, for any period ending on or after the date of
this Agreement shall not, in and of itself, and apart from the underlying event,
occurrence or state of facts, if any, be deemed to constitute a Material Adverse
Change or a Material Adverse Effect.

     "MERGERS" -- as defined in the Recitals.

     "MERGER CONSIDERATION" -- as defined in Section 3.1.

     "MJDS POLICY" - as defined in Section 4.5.

     "NASDAQ" -- as defined in Section 3.3.

                                       A-5


     "OCCUPATIONAL SAFETY AND HEALTH LAW" -- any legal or governmental
requirement or obligation relating to safe and healthful working conditions or
to reduce occupational safety and health hazards.

     "OLD CERTIFICATES" -- as defined in Section 3.3.

     "ORDER" -- any order, consent order, stay, injunction, judgment, decree,
consent decree, ruling, writ, assessment or arbitration award of a Governmental
Authority.

     "ORGANIZATIONAL DOCUMENTS" -- (a) the articles or certificate of
incorporation or organization and the bylaws or code of regulations of a
corporation; (b) the partnership agreement and any statement of partnership of a
general partnership; (c) the limited partnership agreement and the certificate
of limited partnership of a limited partnership; (d) the articles or certificate
of formation and operating agreement of a limited liability company; (e) any
charter, trust certificate or document or similar document adopted or filed in
connection with the creation, formation or organization of a Person; and (e) any
and all currently effective amendments to any of the foregoing.

     "ORIGINAL MERGER AGREEMENT" -- as defined in the Recitals.

     "PENSION PLAN" means an Employee Benefit Plan which is an "employee pension
benefit plan" within the meaning of Section 3(2) of ERISA.

     "PERMITTED ENCUMBRANCES" means (a) liens for current taxes and other
statutory liens and trusts not yet due and payable or that are being contested
in good faith, (b) liens that were incurred in the ordinary course of business,
such as carriers', warehousemen's, landlords' and mechanics' liens and other
similar liens arising in the ordinary course of business, (c) liens on personal
property leased under operating leases, (d) liens, pledges or deposits incurred
or made in connection with workmen's compensation, unemployment insurance and
other social insurance and social security benefits, or securing the performance
of bids, tenders, leases, contracts (other than for the repayment of borrowed
money), statutory obligations, progress payments, surety and appeal bonds and
other obligations of like nature, in each case incurred in the ordinary course
of business, (e) pledges of or liens on manufactured products as security for
any drafts or bills of exchange drawn in connection with the importation of such
manufactured products in the ordinary course of business, (f) liens under
Article 2 of the Uniform Commercial Code or under applicable Canadian provincial
personal property security Laws that are special property interests in goods
identified as goods to which a contract refers, and (g) liens under Article 9 of
the Uniform Commercial Code or under applicable Canadian provincial personal
property security Laws that are purchase money security interests, none of which
are material in the aggregate or individually.

     "PERSON" -- any individual, corporation (including any non-profit
corporation), general or limited partnership, limited liability company, joint
venture, estate, trust, association, organization, labor union or other entity
or Governmental Authority.

     "PRI" -- as defined in the Recitals.

     "PRI ACQUISITION AGREEMENT" -- as defined in Section 7.3.

     "PRI CANADA" -- PRI Automation (Canada), Inc., a corporation organized
under the Canada Business Corporations Act.

     "PRI CLASS ONE PREFERRED STOCK" -- as defined in Section 5.3.

     "PRI COMMON STOCK" -- the Common Stock, $0.01 par value, of PRI.

     "PRI COPYRIGHTS" -- as defined in Section 5.15.

     "PRI DISSENTING SHARES" -- as defined in Section 3.2.

     "PRI EXCHANGEABLE SHARES" means the Exchangeable Shares authorized by the
articles of arrangement of PRI Canada.

     "PRI EXCHANGEABLE SHARE PROVISIONS" means the provisions of the articles of
arrangement of PRI Canada relating to the PRI Exchangeable Shares, as
supplemented by the provisions of the PRI Voting and Exchange Trust Agreement
and the PRI Support Agreement.

                                       A-6


     "PRI INTELLECTUAL PROPERTY ASSETS" -- as defined in Section 5.15.

     "PRI LATEST FORM 10-Q" -- as defined in Section 5.7.

     "PRI MARKS" -- as defined in Section 5.15.

     "PRI MATERIAL CONTRACTS" -- as defined in Section 5.12.

     "PRI OPTIONS" -- as defined in Section 3.4.

     "PRI PATENTS" -- as defined in Section 5.15.

     "PRI PREFERRED STOCK" -- as defined in Section 5.3.

     "PRI RIGHTS" -- has the same meaning as the term "Rights" under the PRI
Rights Plan.

     "PRI RIGHTS PLAN" means the Rights Agreement dated as of December 9, 1998
between PRI and State Street Bank and Trust Company, as rights agent, as amended
to date.

     "PRI SEC REPORTS" -- as defined in Section 5.7.

     "PRI SECRET INFORMATION" -- as defined in Section 5.15.

     "PRI SERIES A PREFERRED STOCK" -- as defined in Section 5.3.

     "PRI SPECIAL VOTING SHARE" -- as defined in Section 5.3.

     "PRI STOCKHOLDER APPROVAL" -- as defined in Section 5.4.

     "PRI STOCKHOLDERS MEETING" -- as defined in Section 8.1.

     "PRI SUBCO" -- 1325949 Ontario Inc., an Ontario corporation.

     "PRI SUPERIOR PROPOSAL" means any written PRI Takeover Proposal for (i) all
of the capital stock, or (ii) not less than 90% of the assets (except to the
extent a portion not in excess of 30% of the assets is reasonably anticipated to
be required to be disposed of pursuant to any requirement of or agreement
entered into with a regulatory body) of the assets of PRI, which PRI Takeover
Proposal the PRI Board of Directors in good faith believes is reasonably capable
of being completed on terms substantially similar to the terms proposed, for
consideration consisting of cash and/or securities, and otherwise on terms which
the Board of Directors of PRI determines in its good faith judgment after
consultation with a financial advisor of nationally recognized reputation and
considering all relevant factors (including the financial terms and the legal
and regulatory factors), would result in a transaction more favorable to PRI's
stockholders compared with the transactions contemplated by this Agreement and
for which financing, to the extent required, is then committed or which, in the
good faith judgment of the Board of Directors of PRI after consultation with its
financial advisor, is reasonably capable of being obtained by such Person.

     "PRI SUPPORT AGREEMENT" means the Support Agreement dated as of March 2,
1999 among PRI, PRI Subco and PRI Canada.

     "PRI TAKEOVER PROPOSAL" or "PONTIAC TAKEOVER PROPOSAL" means any inquiry,
proposal or offer from any Person relating to any direct or indirect acquisition
or purchase by such Person of a business or assets that constitutes 15% or more
of the net revenues, net income or assets of PRI and its Subsidiaries, taken as
a whole, or 15% or more of any class of equity securities of PRI, any tender
offer or exchange offer that if consummated would result in any Person
beneficially owning 15% or more of any class of equity securities of PRI, or any
merger, consolidation, business combination, recapitalization, liquidation,
dissolution or similar transaction involving PRI or the PRI Common Stock (or any
PRI Subsidiary whose business constitutes 30% or more of the net revenues, net
income or assets of PRI and its Subsidiaries, taken as whole), other than the
transactions contemplated by this Agreement.

     "PRI TERMINATION FEE" -- as defined in Section 8.7.

                                       A-7


     "PRI VOTING AND EXCHANGE TRUST AGREEMENT" means the Voting and Exchange
Trust Agreement dated as of March 2, 1999 among PRI, PRI Subco, PRI Canada and
Montreal Trust Company of Canada.

     "PRI WARRANTS" -- as defined in Section 3.4.

     "PROCEEDING" -- any pending formal or informal action, investigation,
arbitration, litigation or other judicial, regulatory or administrative
proceeding.

     "REGISTRATION STATEMENT" -- the registration statement on Form S-4 to be
filed by Brooks with the SEC pursuant to Sections 4.8, 5.8 and 8.1.

     "RELEASE" -- any release, spill, effluent, emission, leaking, pumping,
injection, deposit, disposal, discharge, dispersal, leaching, or migration into
the indoor or outdoor environment of any Hazardous Material through or in the
air, soil, surface water or groundwater.

     "REMEDIAL ACTION" -- all actions, including, without limitation, any
expenditures, required or voluntarily undertaken to (a) clean up, remove, treat,
or in any other way address any Hazardous Material or other substance in the
indoor or outdoor environment; (b) prevent the Release or threat of Release, or
minimize the further Release of any Hazardous Material or other substance so it
does not migrate or endanger or threaten to endanger public health or welfare of
the indoor or outdoor environment; (c) perform pre-remedial studies and
investigations or post-remedial monitoring and care; or (d) bring any Facility
into compliance with all applicable Environmental Laws and Governmental Permits.

     "RESTRAINTS" -- as defined in Section 9.1.

     "SEC" -- the United States Securities and Exchange Commission.

     "SECOND MERGER" -- as defined in the Recitals.

     "SECOND SURVIVING CORPORATION" -- as defined in Section 2.3.

     "SECURITIES ACT" -- the Securities Act of 1933, as amended, or any
successor law.

     "SIGNIFICANT SUBSIDIARY" has the meaning specified by Rule 1-02(w) of
Regulation S-X of the SEC.

     "SUBSIDIARY" -- with respect to any Person means any corporation, joint
venture, limited liability company, partnership, association or other business
entity of which more than 50% of the total voting power of stock or other equity
interest entitled to vote generally in the election of directors or managers or
equivalent positions thereto is owned or controlled, directly or indirectly, by
such Person.

     "TAXES" means all taxes, charges, fees, Encumbrances, customs, duties or
other assessments, however denominated, including any interest, penalties,
additions to tax or additional taxes that may become payable in respect thereof,
imposed by any Governmental Authority, which taxes shall include without
limitation all income taxes, payroll and employee withholding taxes,
unemployment insurance, social security, sales and use taxes, excise taxes,
capital taxes, franchise taxes, gross receipt taxes, occupation taxes, real and
personal property taxes, value added taxes, stamp taxes, transfer taxes,
workers' compensation taxes, taxes relating to benefit plans and other
obligations of the same or similar nature.

     "TAX AUTHORITY" means any Governmental Authority that administers Taxes or
enforces the payment or imposition of Taxes.

     "TAX RETURN" -- any report, return, declaration, statement, or other
information required to be filed with any Governmental Authority with respect to
or in connection with Taxes.

     "TRADING DAY" -- any day on which the Nasdaq National Market is open for
business.

                                       A-8


                            ARTICLE II.  THE MERGERS

SECTION 2.1  PROCEDURE FOR THE MERGERS

     (a)  First Merger.  Upon the terms and subject to the conditions set forth
in this Agreement (including Section 2.10), Brooks Merger Sub shall be merged,
in accordance with section 78 of the MBCL, with and into PRI. The First Merger
shall be effected by filing articles of merger with the Secretary of State of
the Commonwealth of Massachusetts in accordance with Section 78 of the MBCL.

     (b)  Second Merger. Upon the terms and subject to the conditions set forth
in this Agreement (including Section 2.10), immediately after the First Merger
(and in any event no later than the time the Secretary of State of the
Commonwealth of Massachusetts shall close for business on the day the First
Merger shall be consummated), PRI shall be merged, in accordance with Section 82
of the MBCL and Section 253 of the DGCL, with and into Brooks. The Second Merger
shall be effected by filing articles of merger with the Secretary of State of
the Commonwealth of Massachusetts in accordance with Section 82 of the MBCL and
filing a certificate of merger with the Secretary of State of the State of
Delaware in accordance with Section 253 of the DGCL.

SECTION 2.2  FIRST SURVIVING CORPORATION

     Following the First Merger, the separate corporate existence of Brooks
Merger Sub shall cease, and PRI shall continue as the surviving corporation (the
"FIRST SURVIVING CORPORATION"). The name of the First Surviving Corporation
shall be PRI Automation, Inc.

SECTION 2.3  SECOND SURVIVING CORPORATION

     Following the Second Merger, the separate corporate existence of PRI shall
cease, and Brooks shall continue as the surviving corporation (the "SECOND
SURVIVING CORPORATION"). The name of the Second Surviving Corporation shall be
Brooks-PRI Automation, Inc.

SECTION 2.4  CLOSING

     The closing of the transactions contemplated by this Agreement (the
"CLOSING") will take place at 10:00 a.m. on a date to be specified by the
parties (the "CLOSING DATE"), which shall be no later than the third business
day after satisfaction or waiver of the conditions set forth in Sections 9.1,
9.2(d) and 9.3(d), unless another time or date is agreed to by the parties
hereto. The Closing will be held at such location in Boston, Massachusetts as is
agreed to by the parties hereto.

SECTION 2.5  EFFECTIVE TIME

     (a)  Subject to the provisions of this Agreement, as soon as practicable on
the Closing Date, the parties shall cause the First Merger contemplated by this
Agreement to be consummated by the filing of articles of merger with the
Secretary of State of the Commonwealth of Massachusetts executed in accordance
with the relevant provisions of the MBCL, and the parties shall make all other
filings or recordings required under the MBCL. The First Merger shall become
effective at such time as the articles of merger have been duly filed with the
Secretary of State of the Commonwealth of Massachusetts, or at such subsequent
date or time as the parties shall agree and specify in the articles of merger
(the time the First Merger becomes effective being hereinafter referred to as
the "EFFECTIVE TIME").

     (b)  Immediately after receiving confirmation from the Secretary of State
of the Commonwealth of Massachusetts that the First Merger has been consummated
(and in any event no later than the time the Secretary of State of the
Commonwealth of Massachusetts shall close for business on the day the First
Merger shall be consummated), the parties shall cause the Second Merger
contemplated by this Agreement to be consummated by the filing of articles of
merger with the Secretary of State of the Commonwealth of Massachusetts executed
in accordance with the relevant provisions of the MBCL and the filing of a
certificate of merger with the Secretary of State of the State of Delaware
executed in

                                       A-9


accordance with the relevant provisions of the DGCL, and the parties shall make
all other filings or recordings required under the MBCL and the DGCL. The Second
Merger shall become effective at the later of the filing of the articles of
merger with the Secretary of State of the Commonwealth of Massachusetts or the
filing of the certificate of merger with the Secretary of State of the State of
Delaware, or at such subsequent date or time as the parties shall agree and
specify in such filings.

SECTION 2.6  ARTICLES OF ORGANIZATION AND BYLAWS OF THE FIRST SURVIVING
CORPORATION

     Except as provided herein, the Articles of Organization of Brooks Merger
Sub, as in effect immediately prior to the Effective Time, shall be the articles
of organization of the First Surviving Corporation until thereafter changed or
amended as provided therein or by applicable law. The bylaws of Brooks Merger
Sub, as in effect immediately prior to the Effective Time, shall be the bylaws
of the First Surviving Corporation until thereafter changed or amended as
provided therein or by applicable law. At the Effective Time, the First
Surviving Corporation shall be authorized to issue 200,000 shares of common
stock, par value $.01 per share. After the Effective Time, the directors and
officers of Brooks Merger Sub shall be the directors and officers of the First
Surviving Corporation.

SECTION 2.7  CERTIFICATE OF INCORPORATION AND BYLAWS OF THE SECOND SURVIVING
CORPORATION

     Except as provided herein, the certificate of incorporation of Brooks, as
in effect immediately prior to the Second Merger, shall be the certificate of
incorporation of the Second Surviving Corporation until thereafter changed or
amended as provided therein or by applicable law. The bylaws of Brooks, as in
effect immediately prior to the Second Merger, shall be the bylaws of the Second
Surviving Corporation until thereafter changed or amended as provided therein or
by applicable law.

SECTION 2.8  BOARD OF DIRECTORS OF BROOKS

     Prior to or contemporaneously with the Effective Time, Brooks shall
increase the size of its Board of Directors to seven directors and appoint
Mitchell G. Tyson and one other designee of PRI (subject to Brooks' approval,
not to be unreasonably withheld) to the Board of Directors of Brooks. If any
such person is unable or unwilling at the Effective Time to serve as a Director
of Brooks, Brooks shall appoint another designee of PRI in place of such person
(subject to Brooks' approval, not to be unreasonably withheld).

SECTION 2.9  NAME OF BROOKS

     At or immediately after the Effective Time, the corporate name of Brooks
shall be changed to Brooks -- PRI Automation, Inc., or as otherwise agreed to
between the parties prior to the Effective Time.

SECTION 2.10  RESERVATION OF RIGHT TO REVISE TRANSACTION

     Not later than the effective time of the Joint Proxy Statement/Prospectus,
Brooks (with the consent of PRI, not to be unreasonably withheld) may change the
method of effecting the business combination among Brooks, Brooks Merger Sub,
and PRI, and each party shall cooperate in such efforts, including to provide
for (a) a merger of PRI with and into Brooks Merger Sub, (b) a merger of PRI
directly into Brooks, or (c) some other substantially similar structure;
provided, however, that no such change shall (i) alter or change the amount or
kind of consideration to be issued to holders of PRI Common Stock, PRI Options
and PRI Warrants as provided for in this Agreement, (ii) result in the
transaction being a taxable transaction for PRI or PRI's stockholders in the
Mergers (including holders of the PRI Exchangeable Shares), (iii) materially
delay receipt of any approval required for the consummation of the transactions
contemplated by this Agreement, (iv) require PRI to obtain the agreement,
approval or consent of any person whose agreement, approval or consent was not
required by the Original Merger Agreement (unless Brooks shall waive the
requirement to obtain such agreement, approval or consent in a manner
satisfactory to PRI), (v) impair or delay the consummation of the Mergers or any
other transaction contemplated hereby or the ability of any party hereto to
perform its obligations hereunder by more than fifteen calendar days; or (vi) in
PRI's sole judgment, cause PRI to breach any representation,

                                       A-10


warranty, covenant or agreement (unless Brooks shall waive compliance with such
representation, warranty, covenant or agreement in a manner satisfactory to
PRI).

SECTION 2.11  WAIVER

     Brooks acknowledges and agrees that, notwithstanding any provision of this
Agreement to the contrary, PRI shall not be required to obtain the agreement,
approval or consent of any person whose agreement, approval or consent was not
required by the Original Merger Agreement, and PRI shall be deemed not to have
breached any representation, warranty, covenant or agreement in this Agreement
if such breach shall arise as a result of the Second Merger or PRI's agreement
to effectuate the Second Merger. Notwithstanding any other provision of this
Agreement, PRI makes no representation or warranty as to any matter regarding
the Second Merger or the consequences of the Second Merger, and no covenant or
agreement of PRI shall apply with respect to, or as a result of, the Second
Merger or PRI's agreement to effectuate the Second Merger.

        ARTICLE III.  EFFECT OF THE MERGERS ON THE CAPITAL STOCK OF THE
               CONSTITUENT CORPORATIONS; EXCHANGE OF CERTIFICATES

SECTION 3.1  EFFECT OF FIRST MERGER ON CAPITAL STOCK

     At the Effective Time, by virtue of the First Merger and without any action
on the part of any party hereto or any holder of any capital stock of Brooks,
Brooks Merger Sub, or PRI:

          (a) Each share of Brooks Common Stock, if any, that is owned by PRI or
     any of its Subsidiaries shall be canceled and cease to exist, no
     consideration shall be delivered in exchange therefore and each holder of a
     certificate representing any such shares shall cease to have any rights
     with respect thereto. Each share of PRI Common Stock and the associated PRI
     Right that is owned by PRI or any of its Subsidiaries shall be canceled and
     cease to exist, no consideration shall be delivered in exchange therefor
     and each holder of a certificate representing any such shares shall cease
     to have any rights with respect thereto.

          (b) Subject to Section 3.3, each share of PRI Common Stock and the
     associated PRI Right (other than shares and PRI Rights canceled pursuant to
     Section 3.1(a) and PRI Dissenting Shares) issued and outstanding
     immediately prior to the Effective Time shall automatically be converted
     into the right to receive 0.52 (the "EXCHANGE RATIO") shares of Brooks
     Common Stock, together with cash, if any, in lieu of any fractional shares
     pursuant to Section 3.3(d). Upon such conversion, all such shares of PRI
     Common Stock and associated PRI Rights shall be canceled and cease to
     exist, and each holder of a certificate representing any such shares shall
     cease to have any rights with respect thereto, except the right to receive
     the number of whole shares of Brooks Common Stock to be issued in
     consideration therefor and any cash in lieu of fractional shares of Brooks
     Common Stock upon the surrender of such certificate in accordance with
     Section 3.3, without interest (collectively, the "MERGER CONSIDERATION").

          (c) The PRI Special Voting Share shall automatically be converted into
     the right to receive the Brooks Special Voting Share. Upon such conversion,
     the PRI Special Voting Share shall be canceled and cease to exist, and the
     holder of such share shall cease to have any rights with respect thereto,
     except the right to receive the Brooks Special Voting Share upon the
     surrender of such certificate.

          (d) Each share of the capital stock of Brooks Merger Sub issued and
     outstanding immediately prior to the Effective Time shall automatically be
     converted into one validly issued, fully paid and nonassessable share of
     the common stock, $.01 par value per share, of the First Surviving
     Corporation.

SECTION 3.2  DISSENTING SHARES

     Notwithstanding anything in this Agreement to the contrary, shares of PRI
Common Stock that have not been voted for adoption of this Agreement and with
respect to which appraisal rights shall have been

                                       A-11


properly perfected in accordance with Sections 85 through 98 of the MBCL (the
"PRI DISSENTING SHARES") shall not be converted into the right to receive the
Merger Consideration in accordance with this Agreement, at or after the
Effective Time, unless and until the holder of such PRI Dissenting Shares
withdraws his demand for such appraisal in accordance with the MBCL or becomes
ineligible for such appraisal. If a holder of PRI Dissenting Shares shall
withdraw his demand for such appraisal in accordance with the MBCL, or shall
become ineligible for such appraisal, then, as of the later of the Effective
Time or the occurrence of such event, such holder's PRI Dissenting Shares shall
cease to be PRI Dissenting Shares and shall be deemed to have converted as of
the Effective Time into the right to receive the Merger Consideration into which
his PRI Common Stock would otherwise have converted as of the Effective Time
pursuant to this Agreement. PRI shall give prompt notice to Brooks of any
demands received by PRI for appraisal of any shares of capital stock of PRI, and
Brooks shall have the right to participate, on an equal basis with PRI, in all
negotiations, proceedings and settlements with respect to such demands. Before
the Effective Time, PRI shall not, without the prior written consent of Brooks,
which consent shall not be unreasonably withheld or delayed, make any payment
with respect to, or settle or offer to settle, any such demands, or agree to do
any of the foregoing.

SECTION 3.3  EXCHANGE OF CERTIFICATES

     (a) As soon as practicable after the Effective Time, Brooks shall deposit
with its transfer agent (or a bank or trust company designated by Brooks prior
to the Effective Time) (the "EXCHANGE AGENT") certificates representing shares
of Brooks Common Stock required to effect the exchanges referred to in Section
3.1, together with cash in an amount estimated in good faith to equal or exceed
the amount payable pursuant to Section 3.3(d) in lieu of fractional shares.

     (b) As soon as practicable after the Effective Time, the Exchange Agent
shall mail to each holder of record of a certificate or certificates that,
immediately prior to the Effective Time, represented outstanding shares of PRI
Common Stock (collectively, the "OLD CERTIFICATES") that were converted
(collectively, the "CONVERTED SHARES") into the right to receive shares of
Brooks Common Stock (collectively, the "COMPANY SHARES") pursuant to Section
3.1, (i) a form of letter of transmittal (which shall specify that delivery
shall be effected, and risk of loss and title to any Old Certificate shall pass,
only upon actual delivery of such Old Certificate to the Exchange Agent) and
(ii) instructions for use in effecting the surrender of Old Certificates in
exchange for certificates representing Company Shares and cash in lieu of the
fraction of a share of Company Shares, if any, payable pursuant to Section
3.3(d) hereof. Upon surrender of an Old Certificate to the Exchange Agent (or to
such other agent or agents as may be appointed by Brooks), together with a duly
executed letter of transmittal and such other documents as the Exchange Agent
shall require, the holder of such Old Certificate shall be entitled to receive
in exchange therefor a certificate representing the number of whole Company
Shares that such holder has the right to receive pursuant to the provisions of
this Article III and payment in lieu of fractional shares which such holder has
the right to receive pursuant to Section 3.3(d) hereof, and the Old Certificate
so surrendered shall forthwith be canceled. In the event of a transfer of
ownership of Converted Shares that is not registered in the transfer records of
PRI, a certificate representing the proper number of Company Shares may be
issued to the transferee if the Old Certificate representing such Converted
Shares is presented to the Exchange Agent, accompanied by all documents deemed
by the Exchange Agent to be required to evidence and effect such transfer and by
evidence satisfactory to the Exchange Agent that any applicable stock transfer
taxes have been paid. If any Old Certificate shall have been lost, stolen,
mislaid or destroyed, then upon receipt of (x) an affidavit of that fact from
the holder claiming such Old Certificate to be lost, mislaid, stolen or
destroyed, (y) such bond, security or indemnity as Brooks or the Exchange Agent
may reasonably require, and (z) any other documentation deemed by the Exchange
Agent to be necessary to evidence and effect the bona fide exchange thereof, the
Exchange Agent shall issue to such holder a certificate representing the number
of Company Shares into which the shares represented by such lost, stolen,
mislaid or destroyed Old Certificate shall have been converted. Until
surrendered as contemplated by this Section 3.3, each Old Certificate shall be
deemed at any time after the Effective Time to represent only the right to
receive the Merger Consideration upon such surrender.

                                       A-12


     (c) No dividends or other distributions declared or made after the
Effective Time with respect to Company Shares with a record date after the
Effective Time shall be paid to the holder of any unsurrendered Old Certificate
with respect to the Company Shares represented thereby, and no cash payment in
lieu of fractional shares shall be made to any such holder pursuant to Section
3.3(d), until the holder of record of such Old Certificate shall surrender such
Old Certificate as contemplated by Section 3.3(b). Subject to the effect of
unclaimed property, escheat and other applicable laws, following surrender of
any such Old Certificate there shall be paid to the holder of the certificates
representing whole Company Shares issued in exchange therefor, without interest,
(i) at the time of such surrender or as soon thereafter as may be practicable,
the amount of any cash payable in lieu of a fractional Company Share to which
such holder is entitled pursuant to Section 3.3(d) and the amount of dividends
or other distributions with a record date after the Effective Time theretofore
paid with respect to such whole Company Shares and (ii) at the appropriate
payment date, the amount of dividends or other distributions with a record date
after the Effective Time but prior to surrender and a payment date subsequent to
surrender payable with respect to such whole Company Shares.

     (d) No certificates or scrip representing fractional Company Shares shall
be issued upon the surrender for exchange of Old Certificates, and such
fractional share interests will not entitle the owner thereof to vote or to any
rights of a holder of Company Shares. In lieu thereof, each holder of Converted
Shares who would otherwise be entitled to a fraction of a Company Share (after
aggregating all fractional Company Shares to be received by such holder) shall
receive from Brooks an amount of cash (rounded down to the nearest whole cent),
without interest, equal to the product of such fraction multiplied by the Market
Value of the Company Shares. The "MARKET VALUE" of the Company Shares means the
closing price per share of the Company Shares (rounded to the nearest cent) on
the Nasdaq National Market ("NASDAQ") (as reported in the Wall Street Journal,
or, if not reported therein, any other authoritative source selected by Brooks)
on the day of the Closing.

     (e) All Company Shares issued upon the surrender for exchange of Converted
Shares in accordance with the terms of this Article III (including any cash paid
in respect thereof) shall be deemed to have been issued in full satisfaction of
all rights pertaining to such Converted Shares under this Article III. From and
after the Effective Time, the stock transfer books of PRI shall be closed and no
transfer of any capital stock of PRI shall thereafter be made. If after the
Effective Time Old Certificates are presented to Brooks for registration of
transfer, they shall be canceled and exchanged for certificates representing the
number of whole Company Shares and the cash amount, if any, determined in
accordance with Article III.

     (f) Any certificates representing Company Shares deposited with the
Exchange Agent pursuant to Section 3.3(a) and not exchanged within one year
after the Effective Time pursuant to this Section 3.3 shall be returned by the
Exchange Agent to Brooks, which shall thereafter act as Exchange Agent. All
funds held by the Exchange Agent for payment to the holders of unsurrendered Old
Certificates and unclaimed at the end of one year from the Effective Time shall
be returned to Brooks, whereupon any holder of unsurrendered Old Certificates
shall look as a general unsecured creditor only to Brooks for payment of any
funds to which such holder may be entitled, subject to applicable law. Neither
the Exchange Agent nor Brooks shall be liable to any person for such shares or
funds delivered to a public official pursuant to any applicable abandoned
property, escheat or similar law.

     (g) Brooks and the Exchange Agent will be entitled to deduct and withhold
from the consideration otherwise payable pursuant to this Agreement such amounts
as Brooks or the Exchange Agent are required to deduct and withhold with respect
to the making of such payment under the Code, or any provision of federal,
state, local or foreign Tax Law. To the extent that amounts are so withheld by
Brooks or the Exchange Agent, such withheld amounts will be treated for all
purposes of this Agreement as having been paid to the holder of PRI Common Stock
in respect of whom such deduction and withholding were made by Brooks or the
Exchange Agent.

                                       A-13


SECTION 3.4  OPTIONS AND WARRANTS

     (a) As of the Effective Time, all (i) options granted by PRI to purchase
its Common Stock pursuant to its stock option plans or otherwise ("PRI OPTIONS")
and (ii) warrants granted by PRI to purchase its Common Stock ("PRI WARRANTS"),
whether vested or unvested, whether or not exercisable, shall be assumed by
Brooks. Immediately after the Effective Time, each PRI Option and PRI Warrant
outstanding immediately prior to the Effective Time shall be deemed to
constitute an option or warrant to acquire, on the same terms and conditions as
were applicable under such PRI Option or PRI Warrant at the Effective Time, the
number of shares of Brooks Common Stock equal to the number of shares of PRI
Common Stock subject to the unexercised portion of such PRI Option or PRI
Warrant multiplied by the Exchange Ratio (rounded down to the nearest whole
share). The exercise price per share of each such assumed PRI Option or PRI
Warrant shall be equal to the exercise price of such PRI Option or PRI Warrant
immediately prior to the Effective Time, divided by the Exchange Ratio (rounded
up to the nearest cent). The terms, exercisability, vesting schedule, status as
an "incentive stock option" under Section 422 of the Code, if applicable, and
all of the other terms of the PRI Options and PRI Warrants shall otherwise
remain unchanged. Without limiting the foregoing, for purposes of determining
vesting of the PRI Options and otherwise, employees of Brooks after the Mergers
will be credited for their full term during which they were employed by PRI to
the extent relevant under the terms of their respective options.

     (b) Before or as of the Effective Time, PRI shall take all necessary
actions with respect to the PRI Options and PRI Warrants under the plans and
instruments governing such PRI Options and PRI Warrants, if any, to provide for
the conversion of the PRI Options and PRI Warrants into options and warrants to
acquire shares of Brooks Common Stock in accordance with this Section 3.4.

     (c) As soon as practicable after the Effective Time, Brooks shall deliver
to the holders of PRI Options and PRI Warrants appropriate notices setting forth
such holders' rights pursuant to such PRI Options and PRI Warrants, as amended
by this Section 3.4, and the agreements evidencing such PRI Options and PRI
Warrants shall continue in effect on the same terms and conditions (subject to
the amendments provided for in this Section 3.4).

     (d) Brooks shall take all corporate action necessary to reserve for
issuance a sufficient number of shares of Brooks Common Stock for delivery upon
exercise of the PRI Options and PRI Warrants assumed in accordance with this
Section 3.4. Before the Effective Time, Brooks shall file one or more
registration statements on Form S-8 (or any successor or other appropriate form)
under the Securities Act with respect to all shares of Brooks Common Stock
subject to PRI Options that may be registered on a Form S-8, and shall use
commercially reasonable efforts to maintain the effectiveness of any such
registration statement for so long as such PRI Options remain outstanding.

SECTION 3.5  CERTAIN ADJUSTMENTS

     If between the date hereof and the Effective Time, the outstanding shares
of PRI Common Stock or of Brooks Common Stock shall be changed into a different
number of shares by reason of any reclassification, recapitalization,
reorganization, split-up, combination or exchange of shares, or if any dividend
payable in stock or other securities shall be declared thereon with a record
date within such period, or if the Brooks Rights become exercisable or are
exercised, the Exchange Ratio shall be adjusted accordingly to provide to the
holders of PRI Common Stock the same economic benefit as was contemplated by
this Agreement prior to such reclassification, recapitalization, reorganization,
split-up, combination, exchange or dividend. If the PRI Rights become
exercisable or are exercised, Brooks, Brooks Merger Sub and PRI shall promptly
negotiate in good faith an amendment to this Agreement that will adjust the
Exchange Ratio accordingly and make such other changes to this Agreement so as
to provide the holders of each share of PRI Common Stock and the holders of each
1/100,000 of a share of Class One Preferred Stock (other than an Acquiring
Person as defined in the PRI Rights Plan) the same economic benefit as was
contemplated hereunder prior to such event for the holder of each share of PRI
Common Stock.

                                       A-14


SECTION 3.6  EFFECT OF SECOND MERGER ON CAPITAL STOCK

     At the time of the Second Merger, by virtue of the Second Merger and
without any action on the part of any party hereto or any holder of any capital
stock of Brooks or PRI, all of the capital stock of PRI issued and outstanding
immediately prior to the Second Merger will be canceled.

             ARTICLE IV.  REPRESENTATIONS AND WARRANTIES OF BROOKS

     Except as disclosed in the Brooks SEC Reports or as set forth on the Brooks
Disclosure Schedule delivered by Brooks to PRI prior to the execution of the
Original Merger Agreement and making reference to the particular subsection of
this Agreement to which exception is being taken, Brooks represents and warrants
to PRI as set forth in this Article IV as of October 23, 2001. Each
representation and warranty in this Article IV continues to speak as of the date
of the Original Merger Agreement (except to the extent expressly made as of an
earlier date, in which case as of such date), as if made only on such date, and
no change, event or other circumstance since that date shall affect the accuracy
of any such representation and warranty as of such date. The Brooks Disclosure
Schedule shall be arranged in sections and paragraphs corresponding to the
numbered and lettered sections and paragraphs contained in this Article IV, and
the disclosure in any section or paragraph shall qualify other sections and
paragraphs in this Article IV only to the extent that it is reasonably apparent
from a reading of such disclosure that it also qualifies or applies to such
other sections and paragraphs.

SECTION 4.1  ORGANIZATION; STANDING AND CORPORATE POWER

     (a) Each of Brooks and its Subsidiaries is a corporation or other legal
entity duly organized, validly existing and in good standing (with respect to
jurisdictions which recognize such concept) under the laws of the jurisdiction
in which it is organized and has the requisite corporate or other power, as the
case may be, and authority to carry on its business as now being conducted,
except for those jurisdictions where the failure to be in good standing,
individually or in the aggregate, would not have a Material Adverse Effect on
Brooks. Each of Brooks and its Subsidiaries is duly qualified or licensed to do
business and is in good standing (with respect to jurisdictions which recognize
such concept) in each jurisdiction in which the nature of its business or the
ownership, leasing or operation of its properties makes such qualification or
licensing necessary, except for those jurisdictions where the failure to be so
qualified or licensed or to be in good standing, individually or in the
aggregate, would not have a Material Adverse Effect on Brooks.

     (b) Brooks has delivered to PRI prior to the execution of the Original
Merger Agreement complete and correct copies of its Organizational Documents, as
amended to date.

     (c) Except as set forth in Section 4.1 of the Brooks Disclosure Schedule,
the minute books of Brooks which have been made available to PRI contain, in all
material respects, accurate records of all meetings and accurately reflect all
other actions taken by the stockholders, the Board of Directors and all
committees of the Board of Directors of Brooks since January 1, 1996.

SECTION 4.2  SUBSIDIARIES

     Section 4.2 of the Brooks Disclosure Schedule includes all the Subsidiaries
of Brooks which as of the date of this Agreement are Significant Subsidiaries.
Except as otherwise indicated on the Brooks Disclosure Schedule, all the
outstanding shares of capital stock of, or other equity interests in, each such
Significant Subsidiary have been duly authorized and validly issued and are
fully paid and nonassessable and are owned directly or indirectly by Brooks,
free and clear of all Encumbrances.

SECTION 4.3  CAPITALIZATION

     (a) The authorized capital stock of Brooks presently consists of 43,000,000
shares of Brooks Common Stock and 1,000,000 shares of preferred stock, par value
$.01 per share ("BROOKS PREFERRED STOCK"), of which 21,500 shares have been
designated Series A Junior Participating Preferred Stock. At the close of
business on October 19, 2001: (i) 19,904,968 shares of Brooks Common Stock were
issued

                                       A-15


and outstanding; (ii) no shares of Brooks Common Stock were held by Brooks in
its treasury or by any Subsidiaries of Brooks; and (iii) no shares of Brooks
Preferred Stock were issued and outstanding or held by Brooks in its treasury or
by any Subsidiaries of Brooks. There has been no material change in such
capitalization between that date and the date of this Agreement. At or prior to
the Effective Time, the authorized capital stock of Brooks shall be increased to
consist of (i) 100,000,000 shares of Brooks Common Stock and 1,000,000 shares of
Preferred Stock, of which 100,000 shares shall have been designated Series A
Junior Participating Preferred Stock, and (iii) the Brooks Special Voting Share.

     (b) Section 4.3 of the Brooks Disclosure Schedule sets forth a complete and
correct list, as of October 19, 2001, of the number of shares of Brooks Common
Stock subject to Brooks Options, Brooks Warrants and other rights to purchase or
receive Brooks Common Stock (other than the Brooks Rights), the dates of grant
and exercise prices thereof.

     (c) All outstanding shares of capital stock of Brooks are duly authorized,
validly issued, fully paid and nonassessable and were not issued in violation of
any preemptive rights. All shares of capital stock of Brooks which may be issued
under the Brooks Options and the Brooks Warrants are duly authorized and not
subject to preemptive rights, and, upon issuance on the terms and conditions
specified in the instruments pursuant to which they are issuable, will be
validly issued, fully paid and nonassessable.

     (d) Except as set forth in this Section 4.3 or in Section 4.3 of the Brooks
Disclosure Schedule and except for changes since October 19, 2001 resulting from
the issuance of shares of Brooks Common Stock pursuant to the Brooks Options:
(i) there are not issued, reserved for issuance or outstanding (A) any shares of
capital stock or other voting securities of Brooks, (B) any securities of Brooks
or any Brooks Subsidiary convertible into or exchangeable or exercisable for
shares of capital stock or voting securities of Brooks, (C) any warrants, calls,
options or other rights to acquire from Brooks or any Brooks Subsidiary, or any
obligation of Brooks or any Brooks Subsidiary to issue, deliver or sell, or
cause to be issued, delivered or sold, any capital stock, voting securities or
securities convertible into or exchangeable or exercisable for capital stock or
voting securities of Brooks; and (ii) there are no obligations, contingent or
otherwise, of Brooks or any Brooks Subsidiary to repurchase, redeem or otherwise
acquire any such securities of Brooks or to provide funds to or make any
material investment (in the form of a loan, capital contribution or otherwise)
in any such Subsidiary or any other entity other than guarantees of bank
obligations of Subsidiaries entered into in the ordinary course of business.
Except as set forth in Section 4.3 of the Brooks Disclosure Schedule, there are
not issued, reserved for issuance or outstanding (A) any securities of Brooks or
any Brooks Subsidiary convertible into or exchangeable or exercisable for shares
of capital stock or other voting securities or ownership interests in any Brooks
Subsidiary, or (B) any warrants, calls, options or other rights to acquire from
Brooks or any Brooks Subsidiary, or any obligation of Brooks or any Brooks
Subsidiary to issue, deliver or sell, or cause to be issued, delivered or sold,
any capital stock, voting securities or other ownership interests in, or any
securities convertible into or exchangeable or exercisable for any capital
stock, voting securities or ownership interests in, any Brooks Subsidiary.
Except as set forth in Section 4.3 of the Brooks Disclosure Schedule, there are
no obligations, contingent or otherwise, of Brooks or any Brooks Subsidiary to
repurchase, redeem or otherwise acquire any such securities of any Brooks
Subsidiary.

     (e) Except as set forth in Section 4.3 of the Brooks Disclosure Schedule,
neither Brooks nor any Brooks Subsidiary is a party to any agreement restricting
the transfer of, relating to the voting of, requiring registration of, or
granting any preemptive, or antidilutive rights with respect to, any securities
of the type referred to in paragraph (a), (b) or (d). Other than the Brooks
Subsidiaries, except as set forth in Section 4.3 of the Brooks Disclosure
Schedule, Brooks does not directly or indirectly beneficially own any securities
or other beneficial ownership interests in any other entity except for
non-controlling investments made in the ordinary course of business in entities
which are not individually or in the aggregate material to Brooks and its
Subsidiaries as a whole. To the Knowledge of Brooks, other than as set forth in
Section 4.3 of the Brooks Disclosure Schedule or in connection with the
Ancillary Agreements, there are no voting trusts, proxies or other voting
agreements or understandings with respect to the shares of capital stock of
Brooks.

                                       A-16


SECTION 4.4  AUTHORIZATION OF TRANSACTION

     Brooks has all requisite power and authority to execute, deliver and
perform this Agreement, any Ancillary Agreements delivered pursuant to this
Agreement, the Amended Support Agreement and the Amended Voting and Exchange
Trust Agreement, to perform its obligations hereunder and thereunder, and to
carry out the transactions contemplated hereby and thereby and to create the
Brooks Special Voting Share. Subject to the adoption of this Agreement, the
approval of the issuance of Brooks Common Stock in the First Merger by a
majority of the outstanding shares of Brooks Common Stock entitled to vote on
such matter (collectively, the "BROOKS STOCKHOLDER APPROVAL"), the creation of
the Brooks Special Voting Share, the entering into by Brooks of the Amended
Support Agreement and the Amended Voting and Exchange Trust Agreement, all
necessary action, corporate or otherwise, has been taken by Brooks to authorize
the execution, delivery and performance of this Agreement, each of the Ancillary
Agreements, the Amended Support Agreement, the Amended Voting and Exchange Trust
Agreement and the transactions contemplated hereby and thereby. This Agreement
and the Ancillary Agreements have been duly executed and delivered by Brooks and
constitute legal, valid and binding obligations of Brooks, enforceable against
Brooks in accordance with their respective terms, except (i) as such
enforceability may be limited by bankruptcy, insolvency, reorganization or
similar laws affecting creditors' rights generally, and (ii) that the remedy of
specific performance and injunctive and other forms of equitable relief may be
subject to equitable defenses and to the discretion of the court before which
any Proceeding therefor may be brought. At the Closing, the Amended Support
Agreement and the Amended Voting and Exchange Trust Agreement will have been
duly executed and delivered by Brooks and, when so executed, will constitute
legal, valid and binding obligations of Brooks, enforceable against Brooks in
accordance with their respective terms, except (i) as such enforceability may be
limited by bankruptcy, insolvency, reorganization or similar laws affecting
creditors' rights generally, and (ii) that the remedy of specific performance
and injunctive and other forms of equitable relief may be subject to equitable
defenses and to the discretion of the court before which any Proceeding therefor
may be brought.

SECTION 4.5  NO CONFLICT OF TRANSACTION WITH OBLIGATIONS AND LAWS

     (a) Except as set forth in Section 4.5 of the Brooks Disclosure Schedule
and subject to compliance with the requirements of paragraph (b) below, none of
the execution, delivery and performance of this Agreement, the Ancillary
Agreements, the Amended Support Agreement and the Amended Voting and Exchange
Trust Agreement nor the consummation of the transactions contemplated hereby or
thereby, will: (i) constitute a breach or violation of the Organizational
Documents of Brooks or any Significant Subsidiary; (ii) require any Order,
consent, waiver, exemption, approval or authorization of, declaration, filing or
registration with, or giving of notice to, any Governmental Authority; (iii)
constitute (with or without the passage of time or the giving of notice) a
breach of, or default under, any debt instrument to which Brooks or any
Significant Subsidiary is a party, or give any person the right to accelerate
any indebtedness or terminate, modify or cancel any right with respect to any
indebtedness; (iv) constitute (with or without the passage of time or giving of
notice) a default (or give rise to a right of termination, cancellation or
acceleration of any obligation or loss of any material benefit) under or breach
of in any material respect any other agreement, instrument or obligation to
which Brooks or any Subsidiary is a party or by which Brooks or any Subsidiary
or any of their assets are bound; (v) result in the creation of any Encumbrance
upon any of the assets of Brooks or any Subsidiary; (vi) result in a violation
of any Law applicable to Brooks or any Subsidiary, or their businesses or
assets; or (vii) invalidate or adversely affect any material Governmental Permit
used in Brooks' or any Subsidiary's business, except in the case of clauses
(iii), (iv) and (v), such conflicts, breaches or defaults as will not have a
Material Adverse Effect on Brooks. Except as set forth in Section 4.5 of the
Brooks Disclosure Schedule, none of the execution, delivery and performance of
this Agreement and the Ancillary Agreements nor the consummation of the
transactions contemplated hereby or thereby will give rise to a right of any
party (other than Brooks or any Subsidiary) to terminate, modify or cancel any
contract, agreement or other instrument required to be disclosed in the Brooks
Disclosure Schedule or disclosed in the Brooks SEC Reports.

                                       A-17


     (b) The consummation of the transactions contemplated hereby and by the
Ancillary Agreements requires: (1) the filing of a pre-merger notification and
report form by Brooks under the HSR Act and any other documents or information
requested by the United States Department of Justice or the United States
Federal Trade Commission in connection therewith; (2) the filing of similar
notifications, applications, documents and information with anti-competition
authorities of foreign jurisdictions; (3) the filing with the SEC of (A) a proxy
statement relating to the Brooks Stockholders Meeting as part of the Joint Proxy
Statement/Prospectus, and (B) such reports under Section 13(a) or 15(d) of the
Exchange Act as may be required in connection with this Agreement and the
transactions contemplated hereby; (4) the filing of articles of merger with the
Secretary of State of the Commonwealth of Massachusetts and a certificate of
merger with the Secretary of State of the State of Delaware; (5) the creation of
the Brooks Special Voting Share and all required corporate filings in connection
therewith; (6) such filings with Governmental Authorities as are necessary to
satisfy the applicable requirements of state securities or "blue sky" laws; and
(7) notification under the Investment Canada Act (Canada) of consummation of the
transaction prior to or within 30 days after consummation; (8) the receipt of
the Amended MRRS Decision Document on or before Closing; (9) if appropriate
exemptions are not available, the filing of the Joint Proxy Statement/Prospectus
pursuant to and in accordance with National Instrument 71-101 -- the
Multijurisdictional Disclosure System (the "MJDS Policy") of the Canadian
provincial securities regulators (the "Canadian Regulators"); (10) approval by
the Toronto Stock Exchange of the continued listing of the PRI Exchangeable
Shares following the Mergers; (11) the issuance by the Canadian Regulators of
all exemptive orders required in connection with the issuance of Brooks Common
Stock in Canada; and (12) such other consents, waivers, exemptions,
declarations, filings, registrations, notices, approvals, Orders or
authorizations the failure of which to be made or obtained individually or in
the aggregate would not (x) have a Material Adverse Effect on Brooks or (y)
reasonably be expected to impair the ability of Brooks to perform its
obligations under this Agreement or the Ancillary Agreements.

SECTION 4.6  PRESENT COMPLIANCE WITH OBLIGATIONS AND LAWS

     Except as set forth in Section 4.6 in the Brooks Disclosure Schedule,
neither Brooks nor any Subsidiary is: (a) in violation of its Organizational
Documents; (b) in default in any material respect in the performance of any
obligation, agreement or condition of any debt instrument that (with or without
the passage of time or the giving of notice) affords to any person the right to
accelerate any indebtedness or terminate any right; (c) in default of or in
breach of in any material respect (with or without the passage of time or the
giving of notice) any other contract to which it is a party or by which it or
its assets are bound, except for such defaults or breaches that will not singly
or in the aggregate have a Material Adverse Effect on Brooks; or (d) in
violation of any Order or Governmental Permit that is held by Brooks or any
Subsidiary applicable to any of them or their respective businesses or assets.
Brooks and the Subsidiaries have conducted and are now conducting their
businesses and the ownership and operation of their assets in compliance in all
material respects with all applicable Laws, including, without limitation, the
Clayton Act, the Sherman Act, the Federal Trade Commission Act and the rules and
regulations thereunder and all Environmental Laws.

SECTION 4.7  BROOKS SEC REPORTS

     (a) Brooks has filed all registration statements, prospectuses, reports,
schedules, forms, statements and other documents (including exhibits and all
other information incorporated therein) required to be filed with the SEC for
the period commencing October 1, 1996 (the "BROOKS SEC REPORTS"). As of their
respective dates, the Brooks SEC Reports complied in all material respects with
the requirements of the Securities Act, or the Exchange Act, as the case may be,
and the rules and regulations of the SEC promulgated thereunder applicable to
such Brooks SEC Reports, and none of the Brooks SEC Reports when filed (or, if
amended or superseded by a filing before the date of this Agreement, then on the
date of such filing) contained any untrue statement of a material fact or
omitted to state a material fact required to be stated therein or necessary in
order to make the statements therein, in light of the circumstances under which
they were made, not misleading.

                                       A-18


     (b) The financial statements of Brooks included in the Brooks SEC Reports
(including any related notes) complied as to form, as of their respective dates
of filing with the SEC, in all material respects with applicable accounting
requirements and the published rules and regulations of the SEC with respect
thereto, were prepared in accordance with GAAP (except, in the case of unaudited
statements, as permitted by Form 10-Q or Form 8-K, as applicable, of the SEC)
applied on a consistent basis during the periods involved (except as may be
indicated in the notes thereto) and fairly present the consolidated financial
position of Brooks and its consolidated subsidiaries as of the dates thereof and
the consolidated results of their operations and cash flows for the periods then
ended (subject, in the case of unaudited statements, to normal and recurring
year-end audit adjustments (which were not and are not expected to be material
in amount) and except that, in the case of financial statements included therein
which were later restated to account for one or more business combinations
accounted for as poolings-of-interest, such original financial statements do not
reflect such restatements).

     (c) Except as set forth in Section 4.7 of the Brooks Disclosure Schedule,
Brooks or its Subsidiaries, as applicable, (i) owns all right, title and
interest in and to each of the material assets shown or reflected on the balance
sheet included in the Form 10-Q for the nine months ended June 30, 2001 filed by
Brooks (the "BROOKS LATEST FORM 10-Q") (except where such assets have been sold
in the ordinary course of business since June 30, 2001), free and clear of all
Encumbrances (other than Permitted Encumbrances), or (ii) licenses, leases or
otherwise possesses legally valid and enforceable rights to use each of such
assets.

SECTION 4.8  INFORMATION SUPPLIED

     (a) None of the information supplied or to be supplied by Brooks
specifically for inclusion or incorporation by reference in (i) the registration
statement on Form S-4 to be filed with the SEC by Brooks in connection with the
issuance of Brooks Common Stock in the First Merger (the "REGISTRATION
STATEMENT") will, at the time the Registration Statement becomes effective under
the Securities Act, contain any untrue statement of a material fact or omit to
state any material fact required to be stated therein or necessary to make the
statements therein, in light of the circumstances under which they were made,
not misleading or (ii) the Joint Proxy Statement/Prospectus will, at the date it
is first mailed to stockholders of Brooks or PRI or at the time of the Brooks
Stockholders Meeting or the PRI Stockholders Meeting, contain any untrue
statement of a material fact or omit to state any material fact required to be
stated therein or necessary in order to make the statements therein, in light of
the circumstances under which they were made, not misleading or omit to state
any material fact necessary to correct any statement in any earlier
communication with respect to the solicitation of proxies for the Brooks
Stockholders Meeting or the PRI Stockholders Meeting which has become false or
misleading.

     (b) The Joint Proxy Statement/Prospectus will comply as to form in all
material respects with the requirements of the Exchange Act and the rules and
regulations thereunder, except that no representation or warranty is made by
Brooks with respect to statements made, omitted or incorporated by reference
therein based on information supplied by PRI specifically for inclusion or
incorporation by reference in the Joint Proxy Statement/Prospectus.

SECTION 4.9  ABSENCE OF UNDISCLOSED LIABILITIES

     Neither Brooks nor any Subsidiary has any liabilities of any nature,
whether accrued, absolute, contingent or otherwise (including without limitation
liabilities as guarantor or otherwise with respect to obligations of others, or
liabilities for Taxes due or then accrued or to become due), except: (a)
liabilities stated or adequately reserved against on the balance sheet included
in the Brooks Latest Form 10-Q, (b) liabilities incurred since June 30, 2001 in
the ordinary course of business consistent with past practices, (c) liabilities
disclosed on Schedule 4.9 of the Brooks Disclosure Schedule, and (d) other
liabilities not in excess of $15 million in the aggregate. To the Knowledge of
Brooks, there is no fact that will have a Material Adverse Effect on Brooks
which has not been specifically disclosed herein or in a schedule hereto.

                                       A-19


SECTION 4.10  ABSENCE OF CERTAIN CHANGES

     Since June 30, 2001, Brooks and its Subsidiaries have conducted their
businesses only in the ordinary course of business, consistent with prior
practices and, whether or not in the ordinary course of business, there has not
been any Material Adverse Change with respect to Brooks. Without limiting the
generality of the foregoing, except as disclosed on Schedule 4.10 of the Brooks
Disclosure Schedule, since June 30, 2001 there has not been:

          (a) any amendment to the Organizational Documents of Brooks or any
     Subsidiary;

          (b) any material contingent liability incurred by Brooks or any of its
     Subsidiaries as guarantor or otherwise with respect to the obligations of
     others;

          (c) any material Encumbrance placed on any of the properties of Brooks
     or any Subsidiary which remains in existence on the date hereof;

          (d) any material obligation or liability incurred by Brooks or any of
     its Subsidiaries other than obligations and liabilities incurred in the
     ordinary course of business consistent with past practice (none of which is
     a claim for breach of contract, breach of duty, breach of warranty, tort or
     infringement of an intellectual property right);

          (e) any sale or other disposition, or any agreement or other
     arrangement for the sale or other disposition, of any material properties
     or assets of Brooks or any of its Subsidiaries other than in the ordinary
     course of business; or

          (f) any declaration, setting aside or payment of any dividend on, or
     the making of any other distribution in respect of, the capital stock of
     Brooks, or any direct or indirect redemption, purchase or other acquisition
     by Brooks of its capital stock.

SECTION 4.11  PAYMENT OF TAXES

     Except as set forth in Section 4.11 of the Brooks Disclosure Schedule:

          (a) Each of Brooks and its Subsidiaries has duly and timely filed all
     Tax Returns that they were required to file, except where the failure to
     file would not have a Material Adverse Effect. All of such Tax Returns were
     complete and correct in all material respects. All Taxes shown to be due on
     such Tax Returns have been paid or are being contested in good faith by
     Brooks and such contest is being diligently pursued, all of which contested
     Taxes are listed in Section 4.11 of the Brooks Disclosure Schedule. With
     respect to all other Taxes for which no Tax Return is required or which
     have not yet accrued or otherwise become due, adequate provision has been
     made in the financial statements included in the SEC Reports. The
     provisions for Taxes reflected in the above-mentioned financial statements
     are adequate to cover any Tax liabilities of Brooks and its Subsidiaries in
     respect of their business, properties and operations during the periods
     covered by said financial statements and all prior periods. All material
     Taxes and other assessments and levies that Brooks or any Subsidiary of
     Brooks was required to withhold or collect have been withheld or collected
     and paid over or will be paid over to proper governmental authorities as
     required. None of Brooks and its Subsidiaries currently is the beneficiary
     of any extension of time within which to file any Tax Return.

          (b) No material deficiencies have been asserted or assessments made
     against Brooks or any Subsidiary of Brooks, nor is any Tax Authority now
     asserting or, to the Knowledge of Brooks, threatening to assert against
     Brooks or any Subsidiary of Brooks any material deficiency or claim for
     additional Taxes or interest thereon or penalties in connection therewith.

          (c) Neither Brooks nor any of its Subsidiaries has waived any statute
     of limitations with respect to Taxes or agreed to an extension of time with
     respect to a Tax assessment or deficiency, which waiver or extension
     currently remains in effect.

                                       A-20


          (d) Neither Brooks nor any of its Subsidiaries is a "consenting
     corporation" within the meaning of Section 341(f) of the Code, and none of
     the assets of Brooks or its Subsidiaries are subject to an election under
     Section 341(f) of the Code.

          (e) Neither Brooks nor any of its Subsidiaries has been a United
     States real property holding corporation within the meaning of Section
     897(c)(2) of the Code during the applicable period specified in Section
     897(c)(1)(A)(ii) of the Code.

          (f) Neither Brooks nor any of its Subsidiaries has any actual or
     potential liability for any Taxes of any person (other than any of Brooks
     and its Subsidiaries) under Treasury Regulation Section 1.1502-6 (or any
     similar provision of federal, state, local or foreign law), or as a
     transferee or successor, by contract, or otherwise.

          (g) Neither Brooks nor any of its Subsidiaries has undergone a change
     in its method of accounting resulting in an adjustment to its taxable
     income pursuant to Section 481 of the Code.

          (h) As of the end of Brooks' most recent taxable year, none of the net
     operating loss carryovers, capital loss carryovers, credit carryovers, or
     other tax attributes of Brooks or its Subsidiaries are subject to
     limitation under Sections 382 or 383 of the Code or to separate return year
     limitations under the applicable consolidated return provisions of the
     Treasury Regulations.

SECTION 4.12  CERTAIN CONTRACTS

     (a) Except as set forth in the Brooks SEC Reports or in Section 4.12 of the
Brooks Disclosure Schedule, neither Brooks nor any of its Subsidiaries is a
party to or bound by (i) any "material contract" (as such term is defined in
Item 601(b)(10) of Regulation S-K of the SEC), (ii) any non-competition
agreement or any other agreement or obligation which purports to limit in any
material respect the manner in which, or the localities in which, all or any
material portion of the business of Brooks and its Subsidiaries, taken as a
whole, has been, or will be, conducted, or (iii) any contract or other agreement
which would prohibit or materially delay the consummation of the First Merger or
any of the transactions contemplated by this Agreement (all contracts of the
type described in clauses (i) and (ii) being referred to herein as "BROOKS
MATERIAL CONTRACTS").

     (b) Each Brooks Material Contract is valid and binding on Brooks (or, to
the extent a Brooks Subsidiary is a party, such Subsidiary) and is in full force
and effect, and Brooks and each Brooks Subsidiary and to Brooks' Knowledge each
other party thereto have in all material respects performed all obligations
required to be performed by them to date under each Brooks Material Contract,
except where such noncompliance, individually or in the aggregate, would not
have a Material Adverse Effect on Brooks. Neither Brooks nor any Brooks
Subsidiary Knows of, or has received notice of, any violation or default under
(nor, to the Knowledge of Brooks, does there exist any condition which with the
passage of time or the giving of notice or both would result in such a violation
or default under) any Brooks Material Contract by Brooks.

SECTION 4.13  LEGAL PROCEEDINGS

     (a) Except as set forth in the Brooks SEC Reports or in Section 4.13 of the
Brooks Disclosure Schedule, neither Brooks nor any Subsidiary has received
notice of, nor to its Knowledge does there exist, any Proceeding that has been
commenced by or against Brooks or any Subsidiary or any of the officers,
directors, former officers or directors, employees, shareholders or agents of
either Brooks or any Subsidiary (in their capacities as such) or that otherwise
relates to the business of, or any of the assets or properties owned or used by,
any of them which, if determined adversely, would have a Material Adverse Effect
on Brooks, nor, to the Knowledge of Brooks, are there any facts which could
reasonably be expected to lead to such a Proceeding.

     (b) There is no Proceeding that challenges, or that may have the effect of
preventing, delaying, making illegal, or otherwise interfering with, any of the
transactions contemplated hereby or by any of the Ancillary Agreements.

                                       A-21


SECTION 4.14  ERISA AND EMPLOYEE BENEFITS

     (a) Except for the Employee Benefit Plans listed on Section 4.14 of the
Brooks Disclosure Schedule, neither Brooks nor any Subsidiary nor any ERISA
Affiliate of any of them maintains, has an obligation to contribute to, or has
any actual or contingent liability with respect to, any Employee Benefit Plan.
Brooks and its Subsidiaries will deliver to PRI or its counsel within 15 days
after the date hereof true and complete copies of (i) plan instruments and
amendments thereto for all Employee Benefit Plans required to be listed on
Section 4.14 of the Brooks Disclosure Schedule (or written summaries of any such
Employee Benefit Plans that are unwritten) and related trust agreements,
insurance and other contracts, summary plan descriptions, and summaries of
material modifications, and material communications distributed to the
participants of each such Employee Benefit Plan, (ii) to the extent annual
reports on Form 5500 are required with respect to any such Employee Benefit
Plan, the three most recent annual reports and attached schedules for each such
Employee Benefit Plan as to which such report is required to be filed, (iii)
where applicable, the most recent (A) opinion, notification and determination
letters, (B) audited financial statements, (C) actuarial valuation reports and
(D) nondiscrimination tests performed under the Code (including Section 401(k)
and 401(m) tests) for each such Employee Benefit Plan, and (iv) all contracts
with third party administrators, investment managers, actuaries, consultants,
vendors or insurance or mutual fund companies.

     (b) Except as set forth on Section 4.14 of the Brooks Disclosure Schedule,
neither Brooks nor any of its Subsidiaries nor any of their ERISA Affiliates
maintains or has ever maintained or contributed to an Employee Benefit Plan
subject to Title IV of ERISA (including a multiemployer plan as defined in ERISA
Section 3(37) and no facts exist under which any of them could incur any
liability under Title IV of ERISA.

     (c) With respect to each Employee Benefit Plan required to be listed on
Section 4.14 of the Brooks Disclosure Schedule, (i) no party in interest or
disqualified person (as defined in Section 3(14) of ERISA and Section 4975 of
the Code, respectively) has at any time engaged in a transaction which could
subject Brooks, PRI or any of their Subsidiaries or ERISA Affiliates, directly
or indirectly, to a Tax, penalty or liability for prohibited transactions
imposed by ERISA Section 406 or Code Section 4975 and (ii) no fiduciary (as
defined in Section 3(21) of ERISA) with respect to any such Employee Benefit
Plan, for whose conduct Brooks, PRI or any of their Subsidiaries could have any
liability (by reason of indemnities or otherwise), has breached any of the
responsibilities or obligations imposed upon the fiduciary under Title I of
ERISA.

     (d) Each Employee Benefit Plan required to be listed on Section 4.14 of the
Brooks Disclosure Schedule which is a "welfare plan" within the meaning of
Section 3(1) of ERISA and which provides health, disability or death benefits is
fully insured and does not utilize a trust intended to be exempt from Tax
pursuant to Section 501 of the Code and neither Brooks nor any Subsidiary is
obligated to directly pay any such benefits or to reimburse any third Person
payor for the payment of such benefits.

     (e) Each Employee Benefit Plan required to be listed on Section 4.14 of the
Brooks Disclosure Schedule which is a Pension Plan and which is subject to
Sections 201, 301 or 401 of ERISA has received a favorable determination letter
from the Internal Revenue Service covering all amendments required by the Tax
Reform Act of 1986 and prior legislation and there are no circumstances that are
likely to result in revocation of any such favorable determination letter.
Except as noted on Section 4.14 of the Brooks Disclosure Schedule, no Pension
Plan has assets other than securities listed on a public exchange, public stock
market, mutual fund shares registered under federal law, publicly traded debt or
government debt instruments, or participant loans extended in accordance with
its terms. Each Employee Benefit Plan required to be listed on Section 4.14 of
the Brooks Disclosure Schedule is and has been operated in material compliance
with its terms and all applicable Laws and Orders currently in effect with
respect thereto, and by its terms can be amended and/or terminated at any time.

     (f) Except as set forth on Section 4.14 of the Brooks Disclosure Schedule
with respect to each Employee Benefit Plan required to be listed on Section 4.14
of the Brooks Disclosure Schedule, no event or omission has occurred, and there
exists no condition, claim, or set of circumstances in connection with

                                       A-22


which Brooks, or any of Subsidiaries could be subject to any liability, loss,
damage, Tax, penalty or expense.

     (g) Except as set forth on Section 4.14 of the Brooks Disclosure Schedule,
the execution and delivery of this Agreement by Brooks, the performance by
Brooks of its obligations hereunder and consummation by Brooks of the
transactions contemplated by this Agreement will not, alone or together with any
other event, (i) entitle any employee or former employee of Brooks or any of its
Subsidiaries to any payment, (ii) result in an increase in the amount of
compensation or benefits or accelerate the vesting or timing of payment of any
benefits or compensation, including but not limited to stock options or benefits
under any deferred compensation plan, payable in respect of any employee or
former employee of Brooks or any of its Subsidiaries, or (iii) result in any
parachute payment under Section 280G of the Code, whether or not such payment is
considered reasonable compensation for services rendered.

     (h) Brooks and its Subsidiaries will take all actions within their control
to ensure that all actions required to be taken by a fiduciary of any Employee
Benefit Plan required to be listed on Section 4.14 of the Brooks Disclosure
Schedule in order to effectuate the transactions contemplated by this Agreement
shall comply with the terms of such Employee Benefit Plan, ERISA and other
applicable Laws.

     (i) No Employee Benefit Plan required to be listed on Section 4.14 of the
Brooks Disclosure Schedule provides benefits, including without limitation death
or medical benefits (through insurance or otherwise), with respect to any
employee or former employee of Brooks or any of its Subsidiaries beyond their
retirement or other termination of service, other than (i) continuation or other
coverage mandated by applicable Law, (ii) retirement or death benefits under any
Pension Plan disclosed on Section 4.14 of the Brooks Disclosure Schedule, (iii)
disability benefits under any welfare plan that have been fully provided for by
insurance or otherwise, (iv) deferred compensation benefits accrued as
liabilities on the consolidated books of Brooks or (v) benefits in the nature of
severance pay.

     (j) No Employee Benefit Plan required to be listed on Section 4.14 of the
Brooks Disclosure Schedule is a "multiple employer plan" as described in Section
3(40) of ERISA or Section 413(c) of the Code.

     (k) Neither Brooks nor any of its Subsidiaries has proposed, agreed to or
announced any changes to any Employee Benefit Plan required to be listed on
Section 4.14 of the Brooks Disclosure Schedule that would cause an increase in
benefits under any such Employee Benefit Plan (or the creation of new benefits
or plans) or to change any employee coverage which would cause an increase in
the expense of maintaining any such plan, except as required by amendments to
Section 401(a) of the Code.

     (l) Other than claims for benefits submitted by participants or
beneficiaries in the ordinary course, no claim against, investigation or request
for information, or Proceeding involving any Employee Benefit Plan required to
be listed on Section 4.14 of Brooks Disclosure Schedule is pending, or to the
Knowledge of Brooks, threatened.

SECTION 4.15  INTELLECTUAL PROPERTY

     (a) As used herein, the term "Brooks Intellectual Property Assets" shall
mean all worldwide intellectual property rights which are material to the
conduct of the business of Brooks or one of its Subsidiaries as it is currently
conducted or as proposed to be conducted by Brooks or any of its Subsidiaries,
including without limitation in both cases: (A) all trademarks, service marks,
trade names, common law trademarks, business names, Internet domain names, trade
dress, slogans, and the goodwill associated therewith, and all registrations or
applications therefor (collectively, "Brooks Marks"); (B) all patents and patent
applications (collectively, "Brooks Patents"); (C) all copyrights in both
published works and unpublished works, including training manuals, marketing and
promotional materials, internal reports, business plans and any other
expressions, mask works and software, firmware and videos, whether registered or
unregistered, and all registrations or applications in connection therewith
(collectively, "Brooks Copyrights"); and (D) information which is considered to
be secret, confidential and proprietary, including all trade secrets, know-how,
confidential information, customer lists, technical information,

                                       A-23


proprietary information, technologies, processes and formulae, source code,
object code, library functions, flow charts, algorithms, architecture,
structure, display screens and development tools, data, plans, drawings and blue
prints, whether tangible or intangible and whether stored, compiled, or
memorialized physically, electronically, photographically, or otherwise
(collectively, "Brooks Secret Information").

     (b) Except as set forth in Section 4.15 of the Brooks Disclosure Schedule,
Brooks or one of its Subsidiaries, as applicable, (i) owns all right, title and
interest in and to each of the Brooks Intellectual Property Assets, free and
clear of all Encumbrances, or (ii) licenses or otherwise possesses legally valid
and enforceable rights to use each of the Brooks Intellectual Property Assets.
Brooks and its Subsidiaries have made all necessary filings and recordations to
protect and maintain their interests in the Brooks Intellectual Property Assets
except where the failure to make such filings or recordation would not have a
Material Adverse Effect on Brooks.

     (c) Except as set forth in Section 4.15 of the Brooks Disclosure Schedule
(i) to the Knowledge of Brooks, all Brooks Patents owned by Brooks or any of its
Subsidiaries are valid and subsisting and all maintenance fees, annuities and
the like required to be paid before the date hereof have been paid; (ii) to the
Knowledge of Brooks, none of the issued Brooks Patents is infringed; (iii) to
the Knowledge of Brooks, neither the validity nor the enforceability of any of
the Brooks Patents has been challenged or threatened in any way by any Person;
and (iv) no Person has notified Brooks in writing that any of the products or
technology used, sold, offered for sale or licensed or proposed for use, sale,
offer for sale or license by Brooks or any of its Subsidiaries infringes any
rights of any Person.

     (d) (i) To the Knowledge of Brooks, all Brooks Marks owned by Brooks or any
of its Subsidiaries are valid and subsisting; (ii) to the Knowledge of Brooks,
none of the Brooks Marks is infringed or diluted, (iii) to the Knowledge of
Brooks, none of the Brooks Marks owned by Brooks or any of its Subsidiaries has
been opposed or challenged, and, to the Knowledge of Brooks, no claims exist
against the use by Brooks or any of its Subsidiaries of any Brooks Marks; and
(iv) to the Knowledge of Brooks, all uses of registered Brooks Marks are in
conformance with applicable statutory and common law so as not to compromise the
strength, good will, and integrity of the Brooks Marks.

     (e) To the Knowledge of Brooks, (i) all the Brooks Copyrights owned by
Brooks or any of its Subsidiaries which are material to the consolidated
business, whether or not registered, are valid and enforceable; (ii) to the
Knowledge of Brooks none of the Brooks Copyrights is infringed or has been
challenged or threatened in any way; and (iii) no claims exist against the use
by Brooks or any of its Subsidiaries of any writings or other expressions used
in the business of Brooks or any of its Subsidiaries as currently conducted or
as proposed to be conducted.

     (f) Brooks and its Subsidiaries have taken reasonable measures to protect
the secrecy, confidentiality and value of their Brooks Secret Information. To
the Knowledge of Brooks, the Brooks Secret Information has not been used,
divulged or appropriated for the benefit of any Person (other than Brooks or any
of its Subsidiaries). To the Knowledge of Brooks, none of the Brooks Secret
Information is subject to any material adverse claim. Reasonably appropriate
policies are in place to protect the continued secrecy, confidentiality and
value of the Brooks Secret Information.

     (g) Except as set forth in Section 4.15 of the Brooks Disclosure Schedule,
to the Knowledge of Brooks, no Brooks Intellectual Property Asset is subject to
any outstanding Order, Proceeding (other than pending Proceedings pertaining to
applications for patent, trademark or copyright registration), or stipulation
restricting in any manner the licensing thereof by Brooks or any of its
Subsidiaries. Neither Brooks nor any of its Subsidiaries has entered into any
agreement to indemnify any other person against any charge of infringement of
the intellectual property rights of any other Person, other than indemnification
as part of the sale or licensing of the products of Brooks and its Subsidiaries
in the ordinary course of business.

     (h) To the Knowledge of Brooks, all employees, contractors, agents and
consultants of Brooks or any of its Subsidiaries who are involved in the
creation of Brooks Intellectual Property Assets or who have access to Brooks
Secret Information have executed a nondisclosure and assignment of inventions

                                       A-24


agreement to protect the confidentiality and to vest in Brooks or any of its
Subsidiaries exclusive ownership of Brooks Intellectual Property Assets, except
where the failure to have executed such an agreement will not have a Material
Adverse Effect. To Brooks' Knowledge, neither Brooks nor any of its Subsidiaries
has written or oral agreements with any employees, contractors, agents or
consultants with respect to the ownership of inventions, trade secrets or other
works as a result of which any such employee, contractor, agent or consultant
may have rights to any material portion of the Brooks Intellectual Property
Assets.

SECTION 4.16  ENVIRONMENTAL MATTERS

     (a) To the Knowledge of Brooks, each of Brooks and its Subsidiaries is in
compliance in all material respects with applicable Environmental Laws, which
compliance includes, but is not limited to, the possession by each of all
Governmental Permits required by any Governmental Authority to operate its
business or under applicable Environmental Laws, and compliance in all material
respects with the terms and conditions thereof. Neither Brooks nor any of its
Subsidiaries has received notice of, nor, to the Knowledge of Brooks, is any
predecessor of any of them the subject of, any Environmental Claim or Remedial
Action. To the Knowledge of Brooks, Brooks and its Subsidiaries have no material
Environmental, Health and Safety Liabilities. To the Knowledge of Brooks, there
are no circumstances or conditions related to Brooks or any of its Subsidiaries,
their operations or Facilities that are reasonably likely to prevent or
interfere with such compliance or give rise to an Environmental Claim or
Remedial Action in the future.

     (b) There are no Environmental Claims that are pending or, to the Knowledge
of Brooks, threatened against Brooks or any of its Subsidiaries or against any
Person whose liability for any Environmental Claim Brooks or any of its
Subsidiaries has retained or assumed either contractually or by operation of
Law.

     (c) To the Knowledge of Brooks, neither Brooks nor any of its Subsidiaries,
nor any other Person acting on behalf of any of them, has disposed of,
transported, stored, or arranged for the disposal of any Hazardous Materials to,
at or upon: (i) any location other than a site lawfully permitted to receive
such Hazardous Materials; (ii) any Facilities except for the use of household
cleaners and office products in the ordinary course of business in compliance
with applicable Environmental Laws; or (iii) any site which, pursuant to CERCLA
or any similar state Law, has been placed on the National Priorities List,
CERCLIS or their state equivalents. To the Knowledge of Brooks, there has not
occurred during the period Brooks or any of its Subsidiaries operated or
possessed any Facility, nor is there presently occurring, a Release, or
threatened Release, of any Hazardous Materials on, into or beneath the surface
of, or adjacent to, any Facilities except for the use of household cleaners and
office products in the ordinary course of business in material compliance with
applicable Environmental Laws.

SECTION 4.17  LABOR MATTERS

     Except as set forth on Section 4.17 of the Brooks Disclosure Schedule,
neither Brooks nor any of its Subsidiaries is a party to or otherwise bound by
any collective bargaining agreement, contract or other agreement or
understanding with a labor union or labor organization. Neither Brooks nor any
of its Subsidiaries is the subject of any Proceeding of which Brooks or any
Subsidiary has received written notice or is otherwise aware asserting that
Brooks or any of its Subsidiaries has committed an unfair labor practice or is
seeking to compel it to bargain with any labor union or labor organization that,
individually or in the aggregate, is reasonably likely to have a Brooks Material
Adverse Effect, nor is there pending or, to the Knowledge of Brooks, threatened,
any labor strike, dispute, walkout, work stoppage or lockout involving Brooks or
any of its Subsidiaries that, individually or in the aggregate, is reasonably
likely to have a Brooks Material Adverse Effect.

SECTION 4.18  BROKERS

     No broker, investment banker, financial advisor or other person other than
Credit Suisse First Boston Corporation (the fees and expenses of which will be
paid by Brooks), is entitled to any broker's, finder's, financial advisor's or
other similar fee, commission or payment in connection with the transactions

                                       A-25


contemplated by this Agreement based upon arrangements made by or on behalf of
Brooks. Brooks has furnished to PRI true and complete copies of all agreements
under which any such fees, commissions or payments are payable and all
indemnification and other agreements related to the engagement of the persons to
whom such fees, commissions or payments are payable.

SECTION 4.19  OPINION OF FINANCIAL ADVISOR

     The Board of Directors of Brooks has received the opinion of Credit Suisse
First Boston Corporation dated the date of this Agreement, to the effect that,
as of the date of the opinion, the Exchange Ratio for the conversion of PRI
Common Stock into Brooks Common Stock is fair from a financial point of view to
Brooks, a signed copy of which opinion will be delivered to PRI solely for
informational purposes promptly after receipt thereof by Brooks, it being
understood and agreed by PRI that such opinion is for the benefit of the Board
of Directors of Brooks and may not be relied upon by PRI, its Affiliates or any
of their respective stockholders.

SECTION 4.20  OWNERSHIP OF PRI COMMON STOCK

     Except as set forth in Section 4.20 of the Brooks Disclosure Schedule, as
of the date hereof, neither Brooks nor, to its Knowledge without independent
investigation, any of its Affiliates, (i) beneficially owns (as defined in Rule
13d-3 under the Exchange Act), directly or indirectly, or (ii) is party to any
agreement, arrangement or understanding for the purpose of acquiring, holding,
voting or disposing of, in each case, shares of capital stock of PRI.

SECTION 4.21  SECTION 203 OF THE DGCL NOT APPLICABLE

     The Board of Directors of Brooks has taken all actions so that the
restrictions contained in Section 203 of the DGCL applicable to a "business
combination" (as defined therein) will not apply to, and no other "fair price,"
"business combination," "moratorium," "control share acquisition" or other form
of antitakeover Law will apply to, the execution, delivery or performance of
this Agreement or the Stockholders Agreement or the consummation of the First
Merger or the other transactions contemplated by this Agreement.

SECTION 4.22  RIGHTS AGREEMENT

     Immediately prior to the execution of the Original Merger Agreement, Brooks
has (a) duly entered into an appropriate amendment to the Brooks Rights Plan,
which amendment has been provided to PRI, and approved by the Board of Directors
of Brooks and (b) taken all other action necessary or appropriate so that the
entering into of this Agreement by Brooks and the entering into of the Voting
Agreements by the Stockholders of Brooks specified in Section 4.23 of this
Agreement do not and will not result in the ability of any Person to exercise
any Brooks Rights under the Brooks Rights Plan or enable or require the Brooks
Rights issued thereunder to separate from the shares of Brooks Common Stock to
which they are attached or to be triggered or become exercisable.

SECTION 4.23  BROOKS ACTION

     Brooks has obtained and delivered to PRI a duly executed Voting Agreement
of Robert J. Therrien, Lynda M. Avallone, Jeff Cassis, Steven E. Hebert, Michael
W. Pippins, Ellen B. Richstone, Charles McKenna, Amin S. Khoury, Roger D.
Emerick, Joseph R. Martin and Juergen Giessmann substantially in the form
attached hereto as Exhibit 4.23A, pursuant to which, among other things, each
such Person has agreed to vote all Brooks Common Stock owned by such Person or
over which he has voting control, in favor of this Agreement and the First
Merger and irrevocably granted a proxy, coupled with an interest, to PRI or its
designee to vote such shares of Brooks Common Stock in favor of this Agreement
and the First Merger.

                                       A-26


SECTION 4.24  CERTAIN TAX MATTERS

     To its Knowledge, after consulting with its independent auditors, neither
Brooks nor any of its Affiliates has taken or agreed to take any action that
would prevent the Mergers from constituting a transaction qualifying as a
reorganization under Section 368 of the Code.

SECTION 4.25  COMPLIANCE WITH INVESTMENT COMPANY ACT

     Brooks is not an "investment company" as defined in the Investment Company
Act of 1940, as amended.

               ARTICLE V.  REPRESENTATIONS AND WARRANTIES OF PRI

     Except as disclosed in the PRI SEC Reports or as set forth on the PRI
Disclosure Schedule delivered by PRI to Brooks prior to the execution of the
Original Merger Agreement and making reference to the particular subsection of
this Agreement to which exception is being taken, PRI represents and warrants to
Brooks as set forth in this Article V as of October 23, 2001. Each
representation and warranty in this Article V continues to speak as of the date
of the Original Merger Agreement (except to the extent expressly made as of an
earlier date, in which case as of such date), as if made only on such date, and
no change, event or other circumstance since that date shall affect the accuracy
of any such representation and warranty as of such date. The PRI Disclosure
Schedule shall be arranged in sections and paragraphs corresponding to the
numbered and lettered sections and paragraphs contained in this Article V, and
the disclosure in any section or paragraph shall qualify other sections and
paragraphs in this Article V only to the extent that it is reasonably apparent
from a reading of such disclosure that it also qualifies or applies to such
other sections and paragraphs.

SECTION 5.1  ORGANIZATION; STANDING AND CORPORATE POWER

     (a) Each of PRI and its Subsidiaries is a corporation or other legal entity
duly organized, validly existing and in good standing (with respect to
jurisdictions which recognize such concept) under the laws of the jurisdiction
in which it is organized and has the requisite corporate or other power, as the
case may be, and authority to carry on its business as now being conducted,
except for those jurisdictions where the failure to be in good standing,
individually or in the aggregate, would not have a Material Adverse Effect on
PRI. Each of PRI and its Subsidiaries is duly qualified or licensed to do
business and is in good standing (with respect to jurisdictions which recognize
such concept) in each jurisdiction in which the nature of its business or the
ownership, leasing or operation of its properties makes such qualification or
licensing necessary, except for those jurisdictions where the failure to be so
qualified or licensed or to be in good standing, individually or in the
aggregate, would not have a Material Adverse Effect on PRI.

     (b) PRI has delivered to Brooks prior to the execution of the Original
Merger Agreement complete and correct copies of its Organizational Documents, as
amended to date.

     (c) Except as set forth in Section 5.1 of the PRI Disclosure Schedule, the
minute books of PRI which have been made available to Brooks contain, in all
material respects, accurate records of all meetings and accurately reflect all
other actions taken by the stockholders, the Board of Directors and all
committees of the Board of Directors of PRI since January 1, 1995.

SECTION 5.2  SUBSIDIARIES

     Section 5.2 of the PRI Disclosure Schedule includes all the Subsidiaries of
PRI which as of the date of this Agreement are Significant Subsidiaries. Except
as set forth in Section 5.2 of the PRI Disclosure Schedule, all the outstanding
shares of capital stock of, or other equity interests in, each such Significant
Subsidiary have been duly authorized and validly issued and are fully paid and
nonassessable and, except for the PRI Exchangeable Shares, are owned directly or
indirectly by PRI, free and clear of all Encumbrances.

                                       A-27


SECTION 5.3  CAPITALIZATION

     (a) The authorized capital stock of PRI consists of 75,000,000 shares of
PRI Common Stock and 400,000 shares of preferred stock, par value $0.01 per
share ("PRI PREFERRED STOCK"), of which 10,000 shares have been designated as
Class One Participating Cumulative Preferred Stock (the "PRI CLASS ONE PREFERRED
STOCK"), 250,000 shares have been designated as Series A Participating
Cumulative Preferred Stock (the "PRI SERIES A PREFERRED STOCK") and one share
has been designated as Special Voting Preferred Stock (the "PRI SPECIAL VOTING
SHARE"). At the close of business on October 19, 2001: (i) 25,595,715 shares of
PRI Common Stock were issued and outstanding; (ii) no shares of PRI Common Stock
were held by PRI in its treasury or by any Subsidiaries of PRI; and (iii) the
PRI Special Voting Share was issued and outstanding, and no other shares of PRI
Preferred Stock were issued and outstanding or held by PRI in its treasury or by
any Subsidiaries of PRI. There has been no material change in such
capitalization between that date and the date of this Agreement.

     (b) Section 5.3 of the PRI Disclosure Schedule sets forth a complete and
correct list, as of October 19, 2001, of the number of shares of PRI Common
Stock subject to PRI Options or other rights to purchase or receive PRI Common
Stock (other than the PRI Rights), the dates of grant and exercise prices
thereof.

     (c) All outstanding shares of capital stock of PRI are duly authorized,
validly issued, fully paid and nonassessable and were not issued in violation of
any preemptive rights. All shares of capital stock of PRI which may be issued
under the PRI Options, the PRI Warrants and the PRI Exchangeable Shares are duly
authorized and not subject to preemptive rights, and, upon issuance on the terms
and conditions specified in the instruments pursuant to which they are issuable,
will be validly issued, fully paid and nonassessable.

     (d) Except as set forth in this Section 5.3 or in Section 5.3 of the PRI
Disclosure Schedule, and except for changes since October 19, 2001 resulting
from the issuance of shares of PRI Common Stock pursuant to the PRI Options and
except as necessary to comply with the exchange, redemption or retraction of PRI
Exchangeable Shares: (i) there are not issued, reserved for issuance or
outstanding (A) any shares of capital stock or other voting securities of PRI,
(B) any securities of PRI or any PRI Subsidiary convertible into or exchangeable
or exercisable for shares of capital stock or voting securities of PRI, or (C)
any warrants, calls, options or other rights to acquire from PRI or any PRI
Subsidiary, or any obligation of PRI or any PRI Subsidiary to issue, deliver or
sell, or cause to be issued, delivered or sold, any capital stock, voting
securities or securities convertible into or exchangeable or exercisable for
capital stock or voting securities of PRI; and (ii) there are no obligations,
contingent or otherwise, of PRI or any PRI Subsidiary to repurchase, redeem or
otherwise acquire any such securities of PRI or to provide funds to or make any
material investment (in the form of a loan, capital contribution or otherwise)
in any such Subsidiary or any other entity other than guarantees of bank
obligations of Subsidiaries entered into in the ordinary course of business.
Except as set forth in Section 5.3 of the PRI Disclosure Schedule, there are not
issued, reserved for issuance or outstanding (A) any securities of PRI or any
PRI Subsidiary convertible into or exchangeable or exercisable for shares of
capital stock or other voting securities or ownership interests in any PRI
Subsidiary, or (B) any warrants, calls, options or other rights to acquire from
PRI or any PRI Subsidiary, or any obligation of PRI or any PRI Subsidiary to
issue, deliver or sell, or cause to be issued, delivered or sold, any capital
stock, voting securities or other ownership interests in, or any securities
convertible into or exchangeable or exercisable for any capital stock, voting
securities or ownership interests in, any PRI Subsidiary. Except as set forth in
Section 5.3 of the PRI Disclosure Schedule, there are no obligations, contingent
or otherwise, of PRI or any PRI Subsidiary to repurchase, redeem or otherwise
acquire any such securities of any PRI Subsidiary.

     (e) Except as set forth in Section 5.3 of the PRI Disclosure Schedule,
neither PRI nor any PRI Subsidiary is a party to any agreement restricting the
transfer of, relating to the voting of, requiring registration of, or granting
any preemptive, or antidilutive rights with respect to, any securities of the
type referred to in paragraph (a), (b) or (d). Other than the PRI Subsidiaries,
except as set forth in Section 5.3 of the PRI Disclosure Schedule, PRI does not
directly or indirectly beneficially own any

                                       A-28


securities or other beneficial ownership interests in any other entity except
for non-controlling investments made in the ordinary course of business in
entities which are not individually or in the aggregate material to PRI and its
Subsidiaries as a whole. To the Knowledge of PRI, other than as set forth in
Section 5.3 of the PRI Disclosure Schedule or in connection with the Ancillary
Agreements, there are no voting trusts, proxies or other voting agreements or
understandings with respect to the shares of capital stock of PRI.

SECTION 5.4  AUTHORIZATION OF TRANSACTION

     PRI has all requisite power and authority to execute, deliver and perform
this Agreement and any Ancillary Agreements delivered pursuant to this
Agreement, to perform its obligations hereunder and thereunder, and to carry out
the transactions contemplated hereby and thereby. Subject to the adoption of
this Agreement and the approval of the First Merger by a majority of the
outstanding shares of PRI Common Stock and PRI Exchangeable Shares entitled to
vote on this Agreement and the First Merger (voting together as a single class)
(collectively, the "PRI STOCKHOLDER APPROVAL"), all necessary action, corporate
or otherwise, has been taken by PRI to authorize the execution, delivery and
performance of this Agreement and each of the Ancillary Agreements and the
transactions contemplated hereby and thereby. This Agreement and the Ancillary
Agreements have been duly executed and delivered by PRI and constitute legal,
valid and binding obligations of PRI, enforceable against PRI in accordance with
their respective terms, except (i) as such enforceability may be limited by
bankruptcy, insolvency, reorganization or similar laws affecting creditors'
rights generally, and (ii) that the remedy of specific performance and
injunctive and other forms of equitable relief may be subject to equitable
defenses and to the discretion of the court before which any Proceeding therefor
may be brought.

SECTION 5.5  NO CONFLICT OF TRANSACTION WITH OBLIGATIONS AND LAWS

     (a) Except as set forth in Section 5.5 of the PRI Disclosure Schedule and
subject to compliance with the requirements of paragraph (b) below, none of the
execution, delivery and performance of this Agreement and the Ancillary
Agreements, nor the consummation of the transactions contemplated hereby or
thereby, will: (i) constitute a breach or violation of the Organizational
Documents of PRI or any Significant Subsidiary; (ii) require any Order, consent,
waiver, exemption, approval or authorization of, declaration, filing or
registration with, or giving of notice to, any Governmental Authority; (iii)
constitute (with or without the passage of time or the giving of notice) a
breach of, or default under, any debt instrument to which PRI or any Significant
Subsidiary is a party, or give any person the right to accelerate any
indebtedness or terminate, modify or cancel any right with respect to any
indebtedness; (iv) constitute (with or without the passage of time or giving of
notice) a default (or give rise to a right of termination, cancellation or
acceleration of any obligation or loss of any material benefit) under or breach
of in any material respect any other agreement, instrument or obligation to
which PRI or any Subsidiary is a party or by which PRI or any Subsidiary or any
of their assets are bound; (v) result in the creation of any Encumbrance upon
any of the assets of PRI or any Subsidiary; (vi) result in a violation of any
Law applicable to PRI or any Subsidiary, or their businesses or assets; or (vii)
invalidate or adversely affect any material Governmental Permit used in PRI's or
any Subsidiary's business, except in the case of clauses (iii), (iv) and (v),
such conflicts, breaches or defaults as will not have a Material Adverse Effect
on PRI. Except as set forth in Section 5.5 of the PRI Disclosure Schedule, none
of the execution, delivery and performance of this Agreement and the Ancillary
Agreements nor the consummation of the transactions contemplated hereby or
thereby will give rise to a right of any party (other than PRI or any
Subsidiary) to terminate, modify or cancel any contract, agreement or other
instrument required to be disclosed in the PRI Disclosure Schedule or disclosed
in the PRI SEC Reports.

     (b) The consummation of the transactions contemplated hereby and by the
Ancillary Agreements requires: (1) the filing of a pre-merger notification and
report form by PRI under the HSR Act and any other documents or information
requested by the United States Department of Justice or the United States
Federal Trade Commission in connection therewith; (2) the filing of similar
notifications, applications, documents and information with anti-competition
authorities of foreign jurisdictions; (3) the filing with the SEC of (A) a proxy
statement relating to the PRI Stockholders Meeting as part of the

                                       A-29


Joint Proxy Statement/Prospectus, and (B) such reports under Section 13(a)or
15(d) of the Exchange Act, as may be required in connection with this Agreement
and the transactions contemplated hereby; (4) the filing with the applicable
Canadian Regulators of the foregoing filings with the SEC; as supplemented by
applicable rules and policy statements; (5) receipt of the Amended MRRS Decision
Document on or before Closing, (6) if appropriate exemptions are not available,
the filing of the Joint Proxy Statement/Prospectus pursuant to and in accordance
with the MJDS Policy of the Canadian Regulators; (7) approval by the Toronto
Stock Exchange of the continued listing of the PRI Exchangeable Shares following
the Mergers; (8) the application for a certificate under Section 116 of the
Income Tax Act (Canada) in respect of the disposition of the shares of 1325949
Ontario Inc. to Brooks in the Second Merger; (9) the filing of articles of
merger with the Secretary of State of the Commonwealth of Massachusetts, a
certificate of merger with the Secretary of State of the State of Delaware and
appropriate documents with the relevant authorities of other states in which PRI
is qualified to do business; (10) such filings with Governmental Authorities as
are necessary to satisfy the applicable requirements of state or provincial
securities or "blue sky" laws; and (11) such other consents, waivers,
exemptions, declarations, filings, registrations, notices, approvals, Orders or
authorizations the failure of which to be made or obtained individually or in
the aggregate would not (x) have a Material Adverse Effect on PRI or (y)
reasonably be expected to impair the ability of PRI to perform its obligations
under this Agreement or the Ancillary Agreements.

SECTION 5.6  PRESENT COMPLIANCE WITH OBLIGATIONS AND LAWS

     Except as set forth in Section 5.6 of the PRI Disclosure Schedule, neither
PRI nor any Subsidiary is: (a) in violation of its Organizational Documents; (b)
in default in any material respect in the performance of any obligation,
agreement or condition of any debt instrument that (with or without the passage
of time or the giving of notice) affords to any person the right to accelerate
any indebtedness or terminate any right; (c) in default of or in breach of in
any material respect (with or without the passage of time or the giving of
notice) any other contract to which it is a party or by which it or its assets
are bound, except for such defaults or breaches that will not singly or in the
aggregate have a Material Adverse Effect on PRI; or (d) in violation of any
Order or Governmental Permit that is held by PRI or any Subsidiary applicable to
any of them or their respective businesses or assets. Except as set forth in
Section 5.6 of the PRI Disclosure Schedule, PRI and the Subsidiaries have
conducted and are now conducting their businesses and the ownership and
operation of their assets in compliance in all material respects with all
applicable Laws, including, without limitation, the Clayton Act, the Sherman
Act, the Federal Trade Commission Act and the rules and regulations thereunder
and all Environmental Laws.

SECTION 5.7  PRI SEC REPORTS

     (a) PRI has filed all registration statements, prospectuses, reports,
schedules, forms, statements and other documents (including exhibits and all
other information incorporated therein) required to be filed with the SEC for
the period commencing October 1, 1996 (the "PRI SEC REPORTS"). As of their
respective dates, the PRI SEC Reports complied in all material respects with the
requirements of the Securities Act, or the Exchange Act, as the case may be, and
the rules and regulations of the SEC promulgated thereunder applicable to such
PRI SEC Reports, and none of the PRI SEC Reports when filed (or, if amended or
superseded by a filing before the date of this Agreement, then on the date of
such filing) contained any untrue statement of a material fact or omitted to
state a material fact required to be stated therein or necessary in order to
make the statements therein, in light of the circumstances under which they were
made, not misleading.

     (b) The financial statements of PRI included in the PRI SEC Reports
(including any related notes) complied as to form, as of their respective dates
of filing with the SEC, in all material respects with applicable accounting
requirements and the published rules and regulations of the SEC with respect
thereto, were prepared in accordance with GAAP (except, in the case of unaudited
statements, as permitted by Form 10-Q or Form 8-K, as applicable, of the SEC)
applied on a consistent basis during the periods involved (except as may be
indicated in the notes thereto) and fairly present the consolidated

                                       A-30


financial position of PRI and its consolidated subsidiaries as of the dates
thereof and the consolidated results of their operations and cash flows for the
periods then ended (subject, in the case of unaudited statements, to normal and
recurring year-end audit adjustments (which were not and are not expected to be
material in amount) and except that, in the case of financial statements
included therein which were later restated to account for one or more business
combinations accounted for as poolings-of-interest, such original financial
statements do not reflect such restatements).

     (c) Except as set forth in Section 5.7 of the PRI Disclosure Schedule, PRI
or its Subsidiaries, as applicable, (i) owns all right, title and interest in
and to each of the material assets shown or reflected on the balance sheet
included in the Form 10-Q for the nine months ended July 1, 2001 filed by PRI
(the "PRI LATEST FORM 10-Q") (except where such assets have been sold in the
ordinary course of business since July 1, 2001), free and clear of all
Encumbrances (other than Permitted Encumbrances), or (ii) licenses, leases or
otherwise possesses legally valid and enforceable rights to use each of such
assets, and, in each case of clause (i) and (ii) PRI and its Subsidiaries may
transfer such rights as are contemplated by this Agreement.

SECTION 5.8  INFORMATION SUPPLIED

     (a) None of the information supplied or to be supplied by PRI specifically
for inclusion or incorporation by reference in (i) the Registration Statement
will, at the time the Registration Statement becomes effective under the
Securities Act, contain any untrue statement of a material fact or omit to state
any material fact required to be stated therein or necessary to make the
statements therein, in light of the circumstances under which they were made,
not misleading or (ii) the Joint Proxy Statement/ Prospectus will, at the date
it is first mailed to stockholders of PRI or Brooks or at the time of the PRI
Stockholders Meeting or the Brooks Stockholders Meeting, contain any untrue
statement of a material fact or omit to state any material fact required to be
stated therein or necessary in order to make the statements therein, in light of
the circumstances under which they were made, not misleading or omit to state
any material fact necessary to correct any statement in any earlier
communication with respect to the solicitation of proxies for the PRI
Stockholders Meeting or the Brooks Stockholders Meeting which has become false
or misleading.

     (b) The Joint Proxy Statement/Prospectus will comply as to form in all
material respects with the requirements of the Exchange Act and the rules and
regulations thereunder, except that no representation or warranty is made by PRI
with respect to statements made, omitted or incorporated by reference therein
based on information supplied by Brooks specifically for inclusion or
incorporation by reference in the Joint Proxy Statement/Prospectus.

SECTION 5.9  ABSENCE OF UNDISCLOSED LIABILITIES

     Neither PRI nor any Subsidiary has any liabilities of any nature, whether
accrued, absolute, contingent or otherwise (including without limitation
liabilities as guarantor or otherwise with respect to obligations of others, or
liabilities for Taxes due or then accrued or to become due), except: (a)
liabilities stated or adequately reserved against on the balance sheet included
in the PRI Latest Form 10-Q, (b) liabilities incurred since July 1, 2001 in the
ordinary course of business consistent with past practices, (c) liabilities
disclosed on Schedule 5.9 of the PRI Disclosure Schedule, and (d) other
liabilities not in excess of $15 million in the aggregate. Except as set forth
in Section 5.9 of the PRI Disclosure Schedule, to the Knowledge of PRI, there is
no fact that will have a Material Adverse Effect on PRI which has not been
specifically disclosed herein or in a schedule hereto.

SECTION 5.10  ABSENCE OF CERTAIN CHANGES

     Except as set forth in Section 5.10 of the PRI Disclosure Schedule, since
July 1, 2001, PRI and its Subsidiaries have conducted their businesses only in
the ordinary course of business, consistent with prior practices and, whether or
not in the ordinary course of business, there has not been any Material Adverse

                                       A-31


Change with respect to PRI. Without limiting the generality of the foregoing,
except as set forth in Section 5.10 of the PRI Disclosure Schedule, since July
1, 2001 there has not been:

          (a) any amendment to the Organizational Documents of PRI or any
     Subsidiary;

          (b) any material contingent liability incurred by PRI or any of its
     Subsidiaries as guarantor or otherwise with respect to the obligations of
     others;

          (c) any material Encumbrance placed on any of the properties of PRI or
     any Subsidiary which remains in existence on the date hereof;

          (d) any material obligation or liability incurred by PRI or any of its
     Subsidiaries other than obligations and liabilities incurred in the
     ordinary course of business consistent with past practice (none of which is
     a claim for breach of contract, breach of duty, breach of warranty, tort or
     infringement of an intellectual property right);

          (e) any sale or other disposition, or any agreement or other
     arrangement for the sale or other disposition, of any material properties
     or assets of PRI or any of its Subsidiaries other than in the ordinary
     course of business;

          (f) any declaration, setting aside or payment of any dividend on, or
     the making of any other distribution in respect of, the capital stock of
     PRI, or any direct or indirect redemption, purchase or other acquisition by
     PRI of its capital stock;

          (g) any material change in the compensation or other amounts payable
     or to become payable by PRI or any of its Subsidiaries to any of its
     officers except changes in the ordinary course of business consistent with
     past practices; or any material change in any bonus, pension or profit
     sharing payment, entitlement or arrangement made to or with any of such
     officers except changes in the ordinary course of business consistent with
     past practices; or any grant of any loans or severance or termination pay
     to such officers; or

          (h) any change in the employment status of the executive officers of
     PRI.

SECTION 5.11  PAYMENT OF TAXES

     Except as set forth in Section 5.11 of the PRI Disclosure Schedule:

          (a) Each of PRI and its Subsidiaries has duly and timely filed all Tax
     Returns that they were required to file, except where the failure to file
     would not have a Material Adverse Effect. All of such Tax Returns were
     complete and correct in all material respects. All Taxes shown to be due on
     such Tax Returns have been paid or are being contested in good faith by PRI
     and such contest is being diligently pursued, all of which contested Taxes
     are listed in Section 5.11 of the PRI Disclosure Schedule. With respect to
     all other Taxes for which no Tax Return is required or which have not yet
     accrued or otherwise become due, adequate provision has been made in the
     financial statements included in the SEC Reports. The provisions for Taxes
     reflected in the above-mentioned financial statements are adequate to cover
     any Tax liabilities of PRI and its Subsidiaries in respect of their
     business, properties and operations during the periods covered by said
     financial statements and all prior periods. All material Taxes and other
     assessments and levies that PRI or any Subsidiary of PRI was required to
     withhold or collect have been withheld or collected and paid over or will
     be paid over to proper governmental authorities as required. None of PRI
     and its Subsidiaries currently is the beneficiary of any extension of time
     within which to file any Tax Return.

          (b) No material deficiencies have been asserted or assessments made
     against PRI or any Subsidiary of PRI, nor is any Tax Authority now
     asserting or, to the Knowledge of PRI, threatening to assert against PRI or
     any Subsidiary of PRI any material deficiency or claim for additional Taxes
     or interest thereon or penalties in connection therewith.

                                       A-32


          (c) Neither PRI nor any of its Subsidiaries has waived any statute of
     limitations with respect to Taxes or agreed to an extension of time with
     respect to a Tax assessment or deficiency, which waiver or extension
     currently remains in effect.

          (d) Neither PRI nor any of its Subsidiaries is a "consenting
     corporation" within the meaning of Section 341(f) of the Code, and none of
     the assets of PRI or its Subsidiaries are subject to an election under
     Section 341(f) of the Code.

          (e) Neither PRI nor any of its Subsidiaries has been a United States
     real property holding corporation within the meaning of Section 897(c)(2)
     of the Code during the applicable period specified in Section
     897(c)(1)(A)(ii) of the Code.

          (f) Neither PRI nor any of its Subsidiaries has made any material
     payment, is obligated to make any material payment, or is a party to any
     agreement that under certain circumstances could obligate it to make any
     material payment that will not be deductible under Section 280G of the
     Code.

          (g) Neither PRI nor any of its Subsidiaries has any actual or
     potential liability for any Taxes of any person (other than any of PRI and
     its Subsidiaries) under Treasury Regulation Section 1.1502-6 (or any
     similar provision of federal, state, local or foreign law), or as a
     transferee or successor, by contract, or otherwise.

          (h) Neither PRI nor any of its Subsidiaries has undergone a change in
     its method of accounting resulting in an adjustment to its taxable income
     pursuant to Section 481 of the Code.

          (i) As of the end of PRI's most recent taxable year, none of the net
     operating loss carryovers, capital loss carryovers, credit carryovers, or
     other tax attributes of PRI or its Subsidiaries are subject to limitation
     under sections 382 or 383 of the Code or to separate return year
     limitations under the applicable consolidated return provisions of the
     Treasury Regulations.

SECTION 5.12  CERTAIN CONTRACTS

     (a) Except as set forth in the PRI SEC Reports or in Section 5.12 of the
PRI Disclosure Schedule, neither PRI nor any of its Subsidiaries is a party to
or bound by (i) any "material contract" (as such term is defined in Item
601(b)(10) of Regulation S-K of the SEC), (ii) any non-competition agreement or
any other agreement or obligation which purports to limit in any material
respect the manner in which, or the localities in which, all or any material
portion of the business of PRI and its Subsidiaries, taken as a whole, has been,
or the business of Brooks and its Subsidiaries after the First Merger will be,
conducted, or (iii) any contract or other agreement which would by its terms
prohibit or materially delay the consummation of the First Merger or any of the
transactions contemplated by this Agreement (all contracts of the type described
in clauses (i) and (ii) being referred to herein as "PRI MATERIAL CONTRACTS").

     (b) Except as set forth in Section 5.12 of the PRI Disclosure Schedule,
each PRI Material Contract is valid and binding on PRI (or, to the extent a PRI
Subsidiary is a party, such Subsidiary) and is in full force and effect, and PRI
and each PRI Subsidiary and to PRI's Knowledge each other party thereto have in
all material respects performed all obligations required to be performed by them
to date under each PRI Material Contract, except where such noncompliance,
individually or in the aggregate, would not have a Material Adverse Effect on
PRI. Except as set forth in Section 5.12 of the PRI Disclosure Schedule, neither
PRI nor any PRI Subsidiary Knows of, or has received notice of, any violation or
default under (nor, to the Knowledge of PRI, does there exist any condition
which with the passage of time or the giving of notice or both would result in
such a violation or default under) any PRI Material Contract by PRI.

SECTION 5.13  LEGAL PROCEEDINGS

     (a) Except as set forth in the PRI SEC Reports or in Section 5.13 of the
PRI Disclosure Schedule, neither PRI nor any Subsidiary has received notice of,
nor to its Knowledge does there exist, any

                                       A-33


Proceeding that has been commenced by or against PRI or any Subsidiary or any of
the officers, directors, former officers or directors, employees, shareholders
or agents of either PRI or any Subsidiary (in their capacities as such) or that
otherwise relates to the business of, or any of the assets or properties owned
or used by, any of them which, if determined adversely, would have a Material
Adverse Effect on PRI, nor, to the Knowledge of PRI, are there any facts which
could reasonably be expected to lead to such a Proceeding.

     (b) There is no Proceeding that challenges, or that may have the effect of
preventing, delaying, making illegal, or otherwise interfering with, any of the
transactions contemplated hereby or by any of the Ancillary Agreements.

SECTION 5.14  EMPLOYEE BENEFITS

     (a) Except for the Employee Benefit Plans listed on Section 5.14 of the PRI
Disclosure Schedule, neither PRI nor any Subsidiary nor any ERISA Affiliate of
any of them maintains, has an obligation to contribute to, or has any actual or
contingent liability with respect to, any Employee Benefit Plan. PRI and its
Subsidiaries will deliver to Brooks or its counsel within 15 days after the date
hereof true and complete copies of (i) plan instruments and amendments thereto
for all Employee Benefit Plans required to be listed on Section 5.14 of the PRI
Disclosure Schedule (or written summaries of any such Employee Benefit Plans
that are unwritten) and related trust agreements, insurance and other contracts,
summary plan descriptions, and summaries of material modifications, and material
communications distributed to the participants of each such Employee Benefit
Plan, (ii) to the extent annual reports on Form 5500 are required with respect
to any such Employee Benefit Plan, the three most recent annual reports and
attached schedules for each such Employee Benefit Plan as to which such report
is required to be filed, (iii) where applicable, the most recent (A) opinion,
notification and determination letters, (B) audited financial statements, (C)
actuarial valuation reports and (D) nondiscrimination tests performed under the
Code (including Section 401(k) and 401(m) tests) for each such Employee Benefit
Plan, and (iv) all contracts with third party administrators, investment
managers, actuaries, consultants, vendors or insurance or mutual fund companies.

     (b) Except as set forth on Section 5.14 of the PRI Disclosure Schedule,
neither PRI nor any of its Subsidiaries nor any of their ERISA Affiliates
maintains or has ever maintained or contributed to an Employee Benefit Plan
subject to Title IV of ERISA (including a multiemployer plan as defined in ERISA
Section 3(37) and no facts exist under which any of them could incur any
liability under Title IV of ERISA.

     (c) With respect to each Employee Benefit Plan required to be listed on
Section 5.14 of the PRI Disclosure Schedule, (i) no party in interest or
disqualified person (as defined in Section 3(14) of ERISA and Section 4975 of
the Code, respectively) has at any time engaged in a transaction which could
subject PRI, Brooks or any of their Subsidiaries or ERISA Affiliates, directly
or indirectly, to a Tax, penalty or liability for prohibited transactions
imposed by ERISA Section 406 or Code Section 4975 and (ii) no fiduciary (as
defined in Section 3(21) of ERISA) with respect to any such Employee Benefit
Plan, for whose conduct PRI, Brooks or any of their Subsidiaries could have any
liability (by reason of indemnities or otherwise), has breached any of the
responsibilities or obligations imposed upon the fiduciary under Title I of
ERISA.

     (d) Each Employee Benefit Plan required to be listed on Section 5.14 of the
PRI Disclosure Schedule which is a "welfare plan" within the meaning of Section
3(1) of ERISA and which provides health, disability or death benefits is fully
insured and does not utilize a trust intended to be exempt from Tax pursuant to
Section 501 of the Code and neither PRI nor any Subsidiary is obligated to
directly pay any such benefits or to reimburse any third Person payor for the
payment of such benefits.

     (e) Each Employee Benefit Plan required to be listed on Section 5.14 of the
PRI Disclosure Schedule which is a Pension Plan and which is subject to Sections
201, 301 or 401 of ERISA has received a favorable determination letter from the
Internal Revenue Service covering all amendments required by the Tax Reform Act
of 1986 and prior legislation and there are no circumstances that are likely to
result

                                       A-34


in revocation of any such favorable determination letter. Except as noted on
Section 5.14 of the PRI Disclosure Schedule, no Pension Plan has assets other
than securities listed on a public exchange, public stock market, mutual fund
shares registered under federal law, publicly traded debt or government debt
instruments, or participant loans extended in accordance with its terms. Each
Employee Benefit Plan required to be listed on Section 5.14 of the PRI
Disclosure Schedule is and has been operated in material compliance with its
terms and all applicable Laws and Orders currently in effect with respect
thereto, and by its terms can be amended and/or terminated at any time.

     (f) Except as set forth on Section 5.14 of the PRI Disclosure Schedule with
respect to each Employee Benefit Plan required to be listed on Section 5.14 of
the PRI Disclosure Schedule, no event or omission has occurred, and there exists
no condition, claim, or set of circumstances in connection with which PRI or any
of its Subsidiaries could be subject to any liability, loss, damage, Tax,
penalty or expense.

     (g) Except as set forth in Section 5.14 of the PRI Disclosure Schedule, the
execution and delivery of this Agreement by PRI, the performance by PRI of its
obligations hereunder and consummation by PRI of the transactions contemplated
by this Agreement will not, alone or together with any other event, (i) entitle
any employee or former employee of PRI or any of its Subsidiaries to any
payment, (ii) result in an increase in the amount of compensation or benefits or
accelerate the vesting or timing of payment of any benefits or compensation,
including but not limited to stock options or benefits under any deferred
compensation plan, payable in respect of any employee or former employee of PRI
or any of its Subsidiaries, or (iii) result in any parachute payment under
Section 280G of the Code, whether or not such payment is considered reasonable
compensation for services rendered.

     (h) PRI and its Subsidiaries will take all actions within their control to
ensure that all actions required to be taken by a fiduciary of any Employee
Benefit Plan required to be listed on Section 5.14 of the PRI Disclosure
Schedule in order to effectuate the transactions contemplated by this Agreement
shall comply with the terms of such Employee Benefit Plan, ERISA and other
applicable Laws.

     (i) Except as set forth in Section 5.14 of the PRI Disclosure Schedule, no
Employee Benefit Plan required to be listed on Section 5.14 of the PRI
Disclosure Schedule provides benefits, including without limitation death or
medical benefits (through insurance or otherwise), with respect to any employee
or former employee of PRI or any of its Subsidiaries beyond their retirement or
other termination of service, other than (i) continuation or other coverage
mandated by applicable Law, (ii) retirement or death benefits under any Pension
Plan disclosed on Section 5.14 of the PRI Disclosure Schedule, (iii) disability
benefits under any welfare plan that have been fully provided for by insurance
or otherwise, (iv) deferred compensation benefits accrued as liabilities on the
consolidated books of PRI or (v) benefits in the nature of severance pay.

     (j) No Employee Benefit Plan required to be listed on Section 5.14 of the
PRI Disclosure Schedule is a "multiple employer plan" as described in Section
3(40) of ERISA or Section 413(c) of the Code.

     (k) Neither PRI nor any of its Subsidiaries has proposed, agreed to or
announced any changes to any Employee Benefit Plan required to be listed on
Section 5.14 of the PRI Disclosure Schedule that would cause an increase in
benefits under any such Employee Benefit Plan (or the creation of new benefits
or plans) or to change any employee coverage which would cause an increase in
the expense of maintaining any such plan, except as required by amendments to
Section 401(a) of the Code.

     (l) Other than claims for benefits submitted by participants or
beneficiaries in the ordinary course, no claim against, investigation or request
for information, or Proceeding involving any Employee Benefit Plan required to
be listed in Section 5.14 of the PRI Disclosure Schedule is pending or, to the
Knowledge of PRI, threatened.

SECTION 5.15  INTELLECTUAL PROPERTY

     (a) As used herein, the term "PRI INTELLECTUAL PROPERTY ASSETS" shall mean
all worldwide intellectual property rights which are material to the conduct of
the business of PRI or one of its

                                       A-35


Subsidiaries as it is currently conducted or as proposed to be conducted by PRI
or any of its Subsidiaries, including without limitation in both cases: (A) all
trademarks, service marks, trade names, common law trademarks, business names,
Internet domain names, trade dress, slogans, and the goodwill associated
therewith, and all registrations or applications therefor (collectively, "PRI
MARKS"); (B) all patents and patent applications (collectively, "PRI PATENTS");
(C) all copyrights in both published works and unpublished works, including
training manuals, marketing and promotional materials, internal reports,
business plans and any other expressions, mask works and software, firmware and
videos, whether registered or unregistered, and all registrations or
applications in connection therewith (collectively, "PRI COPYRIGHTS"); and (D)
information which is considered to be secret, confidential and proprietary,
including all trade secrets, know-how, confidential information, customer lists,
technical information, proprietary information, technologies, processes and
formulae, source code, object code, library functions, flow charts, algorithms,
architecture, structure, display screens and development tools, data, plans,
drawings and blue prints, whether tangible or intangible and whether stored,
compiled, or memorialized physically, electronically, photographically, or
otherwise (collectively, "PRI SECRET INFORMATION").

     (b) Except as set forth in Section 5.15 of the PRI Disclosure Schedule, PRI
or one of its Subsidiaries, as applicable, (i) owns all right, title and
interest in and to each of the PRI Intellectual Property Assets, free and clear
of all Encumbrances, or (ii) licenses or otherwise possesses legally valid and
enforceable rights to use each of the PRI Intellectual Property Assets, and, in
each case of clause (i) or (ii) PRI and its Subsidiaries may effect such
transfer of such rights, if any, as is contemplated by this Agreement. PRI and
its Subsidiaries have made all necessary filings and recordations to protect and
maintain their interests in the PRI Intellectual Property Assets except where
the failure to make such filings or recordation would not have a Material
Adverse Effect on PRI.

     (c) Except as set forth in Section 5.15 of the PRI Disclosure Schedule, (i)
a true, correct and complete list of all PRI Patents (excluding patent
applications) owned by PRI or any of its Subsidiaries is set forth in Section
5.15 of the PRI Disclosure Schedule; (ii) to the Knowledge of PRI all PRI
Patents owned by PRI or any of its Subsidiaries are valid and subsisting and all
maintenance fees, annuities and the like required to be paid before the date
hereof have been paid; (iii) to the Knowledge of PRI, none of the issued PRI
Patents is infringed; (iv) to the Knowledge of PRI the validity or
enforceability of the PRI Patents has not been challenged or threatened in any
way by any Person; and (v) no Person has notified PRI in writing that any of the
products or technology used, sold, offered for sale or licensed or proposed for
use, sale, offer for sale or license by PRI or any of its Subsidiaries infringes
any rights of any Person.

     (d) A true, correct and complete list of all registered PRI Marks owned by
PRI or any of its Subsidiaries is set forth on Section 5.15 of the PRI
Disclosure Schedule; (ii) to the Knowledge of PRI, all PRI Marks owned by PRI or
any of its Subsidiaries are valid and subsisting; (iii) to the Knowledge of PRI,
none of the PRI Marks is infringed or diluted, (iv) to the Knowledge of PRI,
none of the PRI Marks owned by PRI or any of its Subsidiaries has been opposed
or challenged, and, to the Knowledge of PRI, no claims exist against the use by
PRI or any of its Subsidiaries of any PRI Marks; and (v) to the Knowledge of PRI
all uses of registered PRI Marks are in conformance with applicable statutory
and common law so as not to compromise the strength, good will, and integrity of
the PRI Marks.

     (e) A true, correct and complete list of all presently registered PRI
Copyrights owned by PRI or any of its Subsidiaries is set forth on Section 5.15
of the PRI Disclosure Schedule; (ii) to the Knowledge of PRI, all the PRI
Copyrights owned by PRI or any of its Subsidiaries which are material to the
consolidated business, whether or not registered, are valid and enforceable;
(iii) to the Knowledge of PRI, none of the PRI Copyrights is infringed or has
been challenged or threatened in any way; and (iv) to the Knowledge of PRI, no
claims exist against the use by PRI or any of its Subsidiaries of any writings
or other expressions used in the business of PRI or any of its Subsidiaries as
currently conducted or as proposed to be conducted.

     (f) PRI and its Subsidiaries have taken reasonable measures to protect the
secrecy, confidentiality and value of their PRI Secret Information. To the
Knowledge of PRI, the PRI Secret Information has not been used, divulged or
appropriated for the benefit of any Person (other than PRI or any of its

                                       A-36


Subsidiaries). To the Knowledge of PRI, none of the PRI Secret Information is
subject to any material adverse claim. Reasonably appropriate policies are in
place to protect the continued secrecy, confidentiality and value of the PRI
Secret Information.

     (g) To the Knowledge of PRI, no PRI Intellectual Property Asset is subject
to any outstanding Order, Proceeding (other than pending Proceedings pertaining
to applications for patent, trademark or copyright registration), or stipulation
restricting in any manner the licensing thereof by PRI or any of its
Subsidiaries. Neither PRI nor any of its Subsidiaries has entered into any
agreement to indemnify any other person against any charge of infringement of
the intellectual property rights of any other Person, other than indemnification
as part of the sale or licensing of the products of PRI and its Subsidiaries in
the ordinary course of business.

     (h) To the Knowledge of PRI, all employees, contractors, agents and
consultants of PRI or any of its Subsidiaries who are involved in the creation
of PRI Intellectual Property Assets or who have access to PRI Secret Information
have executed a nondisclosure and assignment of inventions agreement to protect
the confidentiality and to vest in PRI or any of its Subsidiaries exclusive
ownership of PRI Intellectual Property Assets, except where the failure to have
executed such an agreement will not have a Material Adverse Effect. To the
Knowledge of PRI, neither PRI nor any of its Subsidiaries has written or oral
agreements with any employees, contractors, agents or consultants with respect
to the ownership of inventions, trade secrets or other works as a result of
which any such employee, contractor, agent or consultant may have rights to any
material portion of the PRI Intellectual Property Assets.

     (i) To the Knowledge of PRI, no officer, employee, contractor, agent or
consultant of PRI or any of its Subsidiaries is in violation of any term of any
employment contract, patent disclosure agreement, proprietary information
agreement, noncompetition agreement, nonsolicitation agreement, confidentiality
agreement, or any other similar contract or agreement or any restrictive
covenant, in each case relating to the right of any such officer, employee,
contractor, agent or consultant to be employed or engaged by PRI or any of its
Subsidiaries because of the nature of the business conducted or to be conducted
by it or relating to the use of trade secrets or proprietary information of
others, and to PRI's Knowledge and belief, the continued employment or retention
of its officers, employees, contractors, agents or consultants does not subject
PRI or any of its Subsidiaries to any material liability with respect to any of
the foregoing matters.

SECTION 5.16  ENVIRONMENTAL MATTERS

     (a) To the Knowledge of PRI, each of PRI and its Subsidiaries is in
compliance in all material respects with applicable Environmental Laws, which
compliance includes, but is not limited to, the possession by each of all
Governmental Permits required by any Governmental Authority to operate its
business or under applicable Environmental Laws, and compliance in all material
respects with the terms and conditions thereof. Neither PRI nor any of its
Subsidiaries has received notice of, nor, to the Knowledge of PRI, is any
predecessor of any of them the subject of, any Environmental Claim or Remedial
Action. To the Knowledge of PRI, PRI and its Subsidiaries have no material
Environmental, Health and Safety Liabilities. To the Knowledge of PRI, there are
no circumstances or conditions related to PRI or any of its Subsidiaries, their
operations or Facilities that are reasonably likely to prevent or interfere with
such compliance or give rise to an Environmental Claim or Remedial Action in the
future.

     (b) There are no Environmental Claims that are pending or, to the Knowledge
of PRI, threatened against PRI or any of its Subsidiaries or against any Person
whose liability for any Environmental Claim PRI or any of its Subsidiaries has
retained or assumed either contractually or by operation of Law.

     (c) To the Knowledge of PRI, neither PRI nor any of its Subsidiaries, nor
any other Person acting on behalf of any of them, has disposed of, transported,
stored, or arranged for the disposal of any Hazardous Materials to, at or upon:
(i) any location other than a site lawfully permitted to receive such Hazardous
Materials; (ii) any Facilities except for the use of household cleaners and
office products in the ordinary course of business in compliance with applicable
Environmental Laws; or (iii) any site which, pursuant to CERCLA or any similar
state Law, has been placed on the National Priorities List,

                                       A-37


CERCLIS or their state equivalents. To the Knowledge of PRI, there has not
occurred during the period PRI or any of its Subsidiaries operated or possessed
any Facility, nor is there presently occurring, a Release, or threatened
Release, of any Hazardous Materials on, into or beneath the surface of, or
adjacent to, any Facilities except for the use of household cleaners and office
products in the ordinary course of business in material compliance with
applicable Environmental Laws.

SECTION 5.17  LABOR MATTERS

     Neither PRI nor any of its Subsidiaries is a party to or otherwise bound by
any collective bargaining agreement, contract or other agreement or
understanding with a labor union or labor organization. Neither PRI nor any of
its Subsidiaries is the subject of any Proceeding of which PRI or any Subsidiary
has received written notice or is otherwise aware asserting that PRI or any of
its Subsidiaries has committed an unfair labor practice or is seeking to compel
it to bargain with any labor union or labor organization that, individually or
in the aggregate, is reasonably likely to have a PRI Material Adverse Effect,
nor is there pending or, to the Knowledge of PRI, threatened, any labor strike,
dispute, walkout, work stoppage or lockout involving PRI or any of its
Subsidiaries that, individually or in the aggregate, is reasonably likely to
have a PRI Material Adverse Effect.

SECTION 5.18  BROKERS

     No broker, investment banker, financial advisor or other person other than
Morgan Stanley & Co. Incorporated (the fees and expenses of which will be paid
by PRI), is entitled to any broker's, finder's, financial advisor's or other
similar fee, commission or payment in connection with the transactions
contemplated by this Agreement based upon arrangements made by or on behalf of
PRI. PRI has furnished to Brooks true and complete copies of all agreements
under which any such fees, commissions or payments are payable and all
indemnification and other agreements related to the engagement of the persons to
whom such fees, commissions or payments are payable.

SECTION 5.19  OPINION OF FINANCIAL ADVISOR

     The Board of Directors of PRI has received the oral opinion of Morgan
Stanley & Co. Incorporated on the date of this Agreement, to the effect that, as
of such date, the Exchange Ratio for the conversion of PRI Common Stock into
Brooks Common Stock is fair from a financial point of view to holders of shares
of PRI Common Stock, and PRI has received the oral undertaking of Morgan Stanley
& Co. Incorporated to deliver to Brooks solely for informational purposes
promptly after delivery thereof to PRI, a signed, written opinion to that
effect, it being understood and agreed by Brooks that such opinion is for the
benefit of the Board of Directors of PRI and may not be relied upon by Brooks,
its Affiliates or any of their respective stockholders.

SECTION 5.20  OWNERSHIP OF BROOKS COMMON STOCK

     Except as set forth in Section 5.20 of the PRI Disclosure Schedule, as of
the date hereof, neither PRI nor, to its Knowledge without independent
investigation, any of its Affiliates, (i) beneficially owns (as defined in Rule
13d-3 under the Exchange Act), directly or indirectly, or (ii) is party to any
agreement, arrangement or understanding for the purpose of acquiring, holding,
voting or disposing of, in each case, shares of capital stock of Brooks.

SECTION 5.21  ANTITAKEOVER LAWS

     No "fair price," "business combination," "moratorium," "control share
acquisition" or other form of antitakeover statute or regulation, including,
without limitation, Chapter 110C of the General Laws of The Commonwealth of
Massachusetts, is or will be applicable to the execution, delivery or
performance of this Agreement or the consummation of the First Merger or the
other transactions contemplated by this Agreement.

                                       A-38


SECTION 5.22  RIGHTS AGREEMENT

     Immediately prior to the execution of the Original Merger Agreement, PRI
has (a) duly entered into an appropriate amendment to the PRI Rights Plan, which
amendment has been provided to Brooks, and approved by the Board of Directors of
PRI and (b) taken all other action necessary or appropriate so that the entering
into of this Agreement by PRI and the entering into of the Voting Agreements by
the stockholders of PRI specified in Section 5.23 of this Agreement does not and
will not result in the ability of any Person to exercise any PRI Rights under
the PRI Rights Plan or enable or require the PRI Rights issued thereunder to
separate from the shares of PRI Common Stock to which they are attached or to be
triggered or become exercisable.

SECTION 5.23  PRI ACTION

     PRI has obtained and delivered to Brooks a duly executed Voting Agreement
of Mordechai Wiesler, Mitchell G. Tyson, Cosmo S. Trapani, Amram Rasiel, Boruch
B. Frusztajer, Alexander V. d'Arbeloff and Kenneth M. Thompson substantially in
the form attached hereto as Exhibit 5.23A pursuant to which among other things
each such Person has agreed to vote all PRI Common Stock owned by such Person or
over which he has voting control, in favor of this Agreement and the First
Merger and irrevocably granted a proxy, coupled with an interest, to Brooks or
its designee to vote such shares of PRI Common Stock in favor of this Agreement
and the First Merger. Mitchell G. Tyson has entered into and delivered the
Employment Agreement with Brooks in the form attached hereto as Exhibit 5.23B.

SECTION 5.24  PRODUCT WARRANTIES; PRODUCT LIABILITY

     Section 5.24 of the PRI Disclosure Schedule sets forth the aggregate
expenses incurred by PRI's customer support and service center in fulfilling its
obligations under its guaranty, warranty and right of return provisions during
the fiscal year ended September 30, 2000, and PRI has no reason to believe that
such expenses will significantly increase as a percentage of sales in the
future. Except as set forth in Section 5.24 of the PRI Disclosure Schedule, no
claim has been asserted against PRI or any of its Subsidiaries since October 1,
1999 for renegotiation or price redetermination of any completed business
transaction.

SECTION 5.25  CERTAIN TAX MATTERS

     To its Knowledge, after consulting with its independent auditors, neither
PRI nor any of its Affiliates has taken or agreed to take any action that would
(i) prevent the Mergers from constituting a transaction qualifying as a
reorganization under Section 368 of the Code or (ii) interfere with Brooks'
ability to continue to account for any past acquisition as a pooling of
interests, if such acquisition was accounted for as a pooling of interests.

SECTION 5.26  COMPLIANCE WITH INVESTMENT COMPANY ACT

     PRI is not an "investment company" as defined in the Investment Company Act
of 1940, as amended.

             ARTICLE VI.  REPRESENTATIONS AND WARRANTIES RELATED TO
                               BROOKS MERGER SUB

     Brooks and Brooks Merger Sub hereby, jointly and severally, represent and
warrant to PRI that the representations and warranties in this Article VI are
true and correct.

SECTION 6.1  ORGANIZATION

     Brooks Merger Sub is a corporation duly organized, validly existing and in
good standing under the laws of the Commonwealth of Massachusetts with full
corporate power and authority to own, lease and operate its properties and to
conduct its business in the manner and in the places where such properties

                                       A-39


are owned or leased or such business is conducted by it. Brooks owns all of the
issued and outstanding capital stock of Brooks Merger Sub.

SECTION 6.2  CAPITALIZATION

     The authorized capital stock of Brooks Merger Sub consists of 200,000
shares of common stock, par value $0.01 per share (the "BROOKS MERGER SUB COMMON
STOCK"), of which 100 shares are issued and outstanding, all of which have been
duly authorized and are validly issued, fully paid and nonassessable and held by
Brooks, and no shares of Brooks Merger Sub Common Stock are held in the treasury
of Brooks Merger Sub. Other than as contained in this Agreement, there are no
authorized or outstanding options, warrants, calls, rights, commitments or other
agreements of any character to which Brooks Merger Sub is a party or by which it
is bound requiring it to issue, transfer, sell, purchase, redeem or acquire any
shares of capital stock or any securities or rights convertible into,
exchangeable for, or evidencing the right to subscribe for or acquire, any
shares of capital stock of Brooks Merger Sub.

SECTION 6.3  AUTHORIZATION OF TRANSACTION

     Brooks Merger Sub has all requisite power and authority to execute and
deliver this Agreement and the Ancillary Agreements to which it is a party, to
perform its obligations hereunder and thereunder and to consummate the First
Merger and the transactions contemplated hereby and thereby. The execution and
delivery of this Agreement and the Ancillary Agreements to which it is a party,
the performance of this Agreement and the Ancillary Agreements and the
consummation by Brooks Merger Sub of the transactions contemplated hereby and
thereby have been duly and validly authorized by all necessary corporate action
on the part of Brooks Merger Sub. This Agreement and the Ancillary Agreements to
which Brooks Merger Sub is a party have been duly and validly executed and
delivered by Brooks Merger Sub and constitute legal, valid and binding
obligations of Brooks Merger Sub, enforceable against it in accordance with
their respective terms, except (i) as such enforceability may be limited by
bankruptcy, insolvency, reorganization or similar laws affecting creditors'
rights generally, and (ii) that the remedy of specific performance and
injunctive and other forms of equitable relief may be subject to equitable
defenses and to the discretion of the court before which any Proceeding therefor
may be brought.

            ARTICLE VII.  COVENANTS RELATING TO CONDUCT OF BUSINESS

SECTION 7.1  CONDUCT OF BUSINESS BY BROOKS

     (a) Except as otherwise expressly contemplated by this Agreement, or as
consented to by PRI in writing (such consent not to be unreasonably withheld or
delayed), during the period from the date of this Agreement to the Effective
Time, Brooks shall, and shall cause its Subsidiaries to, carry on their
respective businesses in the ordinary course consistent with past practice and
in compliance in all material respects with all applicable Laws and, to the
extent consistent therewith, use all reasonable efforts to preserve intact their
current business organizations, use reasonable efforts to keep available the
services of their current officers and other key employees and preserve their
relationships with those persons having business dealings with them to the end
that their goodwill and ongoing businesses shall be unimpaired at the Effective
Time. Without limiting the generality of the foregoing (but subject to the above
exceptions), during the period from the date of this Agreement to the Effective
Time, Brooks shall not, and shall not permit any of its Subsidiaries to:

          (i) other than dividends and distributions by a direct or indirect
     wholly owned Subsidiary of Brooks to its parent, or by a Subsidiary that is
     partially owned by Brooks or any of its Subsidiaries, provided that Brooks
     or any such Subsidiary receives or is to receive its proportionate share
     thereof, (A) declare, set aside or pay any dividends on, make any other
     distributions in respect of, or enter into any agreement with respect to
     the voting of, any of its capital stock, (B) split, combine or reclassify
     any of its capital stock or issue or authorize the issuance of any other
     securities in respect of, in lieu of or in substitution for shares of its
     capital stock, except for issuances of Brooks Common

                                       A-40


     Stock upon the exercise of Brooks Options or Brooks Warrants which are
     either outstanding as of the date hereof in accordance with their present
     terms, including cashless exercise, or are permitted to be issued pursuant
     to Section 7.1(a)(ii) hereof, or (C) purchase, redeem or otherwise acquire
     any shares of capital stock of Brooks or any of its Subsidiaries or any
     other securities thereof or any rights, warrants or options to acquire any
     such securities (except the deemed acceptance of shares of Brooks Common
     Stock upon cashless exercise of Brooks Options or Brooks Warrants, or in
     connection with withholding obligations relating thereto and except from
     former employees, directors and consultants in accordance with agreements
     existing on the date hereof and providing for the repurchase of shares in
     connection with any termination of service of such party);

          (ii) issue, deliver, sell or subject to any Encumbrance any shares of
     the capital stock of Brooks or any of its Subsidiaries, any other voting
     securities or any securities convertible into or exchangeable or
     exercisable for, or any rights, warrants or options to acquire, any such
     shares, voting securities or convertible securities, in any transaction
     which would materially delay or impair the ability of Brooks to perform its
     obligations under this Agreement, and in any such case not for less than
     the then current market price of such securities, provided that the
     foregoing shall not prohibit (A) the issuance of Brooks Common Stock or
     warrants to purchase Brooks Common Stock in connection with any acquisition
     permitted by Section 7.1(a)(iv) or the issuance (or deemed issuance, by way
     of assumption or otherwise) of options or warrants to purchase Brooks
     Common Stock in exchange for outstanding securities, rights, warrants or
     options to acquire any securities of another Person in connection with any
     such acquisition, (B) the issuance of Brooks Common Stock upon the exercise
     of Brooks Options or Brooks Warrants outstanding as of the date hereof in
     accordance with their present terms, (C) the issuance of Brooks Options
     (and shares of Brooks Common Stock upon the exercise thereof) granted after
     the date hereof either in the ordinary course of business or in connection
     with and promptly following an acquisition permitted by Section 7.1(a)(iv),
     or (D) the issuance of Brooks Rights (and shares of Brooks Preferred Stock
     upon the exercise thereof) in accordance with the terms of the Brooks
     Rights Plan, as in effect on the date hereof so long as nothing permitted
     by the foregoing (A) through (D) shall materially delay or impair the
     ability of Brooks to perform its obligations under this Agreement.

          (iii) amend any of its Organizational Documents other than as
     contemplated by this Agreement;

          (iv) acquire or agree to acquire (by merging or consolidating with, or
     by purchasing a substantial portion of the assets of, or by any other
     manner), any business or any Person in a manner which would materially
     delay or impair the ability of Brooks to perform its obligations under this
     Agreement or that would either involve aggregate consideration in excess of
     $200 million or require the approval of Brooks stockholders under the
     Organizational Documents of Brooks or the rules and regulations of the
     Nasdaq Stock Market, Inc. applicable to Brooks. (For purposes hereof,
     "aggregate consideration" shall equal the sum of (A)(1) the amount of cash
     to be paid, (2) the value of any shares of Brooks Common Stock (valued at
     the closing price of the Brooks Common Stock on Nasdaq on the day prior to
     announcement of such acquisition) to be delivered, and (3) the fair market
     value of any non-cash or non-Brooks Common Stock consideration (including
     the issuance (or deemed issuance, by way of assumption or otherwise) of
     options or warrants to purchase Brooks Common Stock in exchange for
     outstanding securities, rights, warrants or options to acquire any
     securities of another Person in connection with any such acquisition, and
     in any case as determined by the Brooks Board of Directors in good faith as
     of the day prior to announcement of such acquisition) to be delivered to
     the seller or its security holders in connection with such acquisition, and
     (B) the amount of liabilities directly or indirectly assumed by Brooks or
     its Subsidiaries or retired or defeased in connection with such
     acquisition, including contingent liabilities to the extent they can be
     estimated by the Brooks Board of Directors in good faith as of the day
     prior to the announcement of such acquisition);

          (v) authorize, or commit or agree to take, any of the foregoing
     actions, provided that the limitations set forth in this Section shall not
     apply to any transaction between Brooks and any wholly owned Subsidiary or
     between any wholly owned Subsidiaries of Brooks.

                                       A-41


     (b) Except as required by Law, Brooks shall not, and shall not permit any
of its Subsidiaries to, voluntarily take any action that would, or that could
reasonably be expected to, result in (i) any of its representations and
warranties set forth in this Agreement that are qualified as to materiality
becoming untrue or inaccurate at the Effective Time, (ii) any of such
representations and warranties that are not so qualified becoming untrue or
inaccurate in any material respect at the Effective Time, or (iii) any of the
conditions to the consummation of this Agreement and the transaction
contemplated hereby as set forth in Article IX not being satisfied.

     (c) Brooks shall promptly advise PRI orally and in writing to the extent it
has Knowledge of (i) any representation or warranty made by it contained in this
Agreement that is qualified as to materiality becoming untrue or inaccurate in
any respect or any such representation or warranty that is not so qualified
becoming untrue or inaccurate in any material respect, (ii) the failure by it or
any of its Subsidiaries to comply in any material respect with or satisfy in any
material respect any covenant, condition or agreement to be complied with or
satisfied by it under this Agreement and (iii) any Material Adverse Effect or
any change or event having, or which, insofar as can reasonably be foreseen,
could reasonably be expected to have a Material Adverse Effect on the truth of
their respective representations and warranties or the ability of the conditions
set forth in Article IX to be satisfied; provided, however, that no such
notification shall affect the representations, warranties, covenants or
agreements of the parties (or remedies with respect thereto) or the conditions
to the obligations of the parties under this Agreement.

SECTION 7.2  CONDUCT OF BUSINESS BY PRI

     (a) Except as otherwise expressly contemplated by this Agreement, or as
consented to by Brooks in writing (such consent not to be unreasonably withheld
or delayed), during the period from the date of this Agreement to the Effective
Time, PRI shall, and shall cause its Subsidiaries to, carry on their respective
businesses in the ordinary course consistent with past practice and in
compliance in all material respects with all applicable Laws and, to the extent
consistent therewith, use all reasonable efforts to preserve intact their
current business organizations, use reasonable efforts to keep available the
services of their current officers and other key employees and preserve their
relationships with those persons having business dealings with them to the end
that their goodwill and ongoing businesses shall be unimpaired at the Effective
Time. Without limiting the generality of the foregoing (but subject to the above
exceptions), during the period from the date of this Agreement to the Effective
Time, PRI shall not, and shall not permit any of its Subsidiaries to:

          (i) other than dividends and distributions by a direct or indirect
     wholly owned Subsidiary of PRI to its parent, or by a Subsidiary that is
     partially owned by PRI or any of its Subsidiaries, provided that PRI or any
     such Subsidiary receives or is to receive its proportionate share thereof,
     and except as contemplated by the PRI Exchangeable Share Provisions, (A)
     declare, set aside or pay any dividends on, make any other distributions in
     respect of, or enter into any agreement with respect to the voting of, any
     of its capital stock, (B) split, combine or reclassify any of its capital
     stock or issue or authorize the issuance of any other securities in respect
     of, in lieu of or in substitution for shares of its capital stock, except
     for issuances of PRI Common Stock upon the exercise of PRI Options or PRI
     Warrants which are either outstanding as of the date hereof in accordance
     with their present terms, including cashless exercise, or are permitted to
     be issued pursuant to Section 7.2(a)(ii) hereof, or (C) purchase, redeem or
     otherwise acquire any shares of capital stock of PRI or any of its
     Subsidiaries or any other securities thereof or any rights, warrants or
     options to acquire any such securities (except, the deemed acceptance of
     shares of PRI Common Stock upon cashless exercise of PRI Options or PRI
     Warrants, or in connection with withholding obligations relating thereto
     and except from former employees, directors and consultants in accordance
     with agreements existing on the date hereof and providing for the
     repurchase of shares in connection with any termination of service of such
     party);

          (ii) issue, deliver, sell or subject to any Encumbrance (other than
     Encumbrances disclosed in Section 5.2 of the PRI Disclosure Schedule) any
     shares of the capital stock of PRI or any of its Subsidiaries, any other
     voting securities or any securities convertible into or exchangeable or

                                       A-42


     exercisable for, or any rights, warrants or options to acquire, any such
     shares, voting securities or convertible securities, other than (A) the
     issuance of PRI Common Stock or warrants to purchase PRI Common Stock in
     connection with any acquisition permitted by Section 7.2(a)(iv), or the
     issuance (or deemed issuance, by way of assumption or otherwise) of options
     or warrants to purchase PRI Common Stock in exchange for outstanding
     securities, rights, warrants or options to acquire any securities of
     another Person in connection with any such acquisition, (B) the issuance of
     PRI Common Stock upon the exercise of PRI Options or PRI Warrants
     outstanding as of the date hereof in accordance with their present terms,
     (C) the issuance to existing or new employees of PRI Options (and shares of
     PRI Common Stock upon the exercise thereof) in an aggregate amount not to
     exceed 200,000 (net of cancellations) granted after the date hereof, (D)
     the issuance of PRI Options (and shares of Common Stock upon exercise
     thereof) to employees of an acquired business in connection with and
     promptly following an acquisition permitted by Section 7.2(a)(iv) in a
     manner consistent with Brooks' past practice in connection with
     acquisitions, (E) the issuance of PRI Common Stock upon the exchange,
     redemption or retraction of PRI Exchangeable Shares or (F) the issuance of
     PRI Rights (and shares of Class One Preferred Stock upon the exercise
     thereof) in accordance with the terms of the PRI Rights Plan, as in effect
     on the date hereof;

          (iii) amend any of its Organizational Documents;

          (iv) acquire or agree to acquire (by merging or consolidating with, or
     by purchasing a substantial portion of the assets of, or by any other
     manner), any business or any Person; provided that PRI may acquire or
     contract to acquire one or more additional businesses with an aggregate
     consideration of not more than $5 million and in each case in a manner
     which would not materially delay or impair the ability of PRI to perform
     its obligations under this Agreement and which is reasonably expected to be
     accretive to PRI's earnings within 12 months following consummation. (For
     purposes hereof, "aggregate consideration" shall equal the sum of (A)(1)
     the amount of cash to be paid, (2) the value of any shares of PRI Common
     Stock (valued at the closing price of the PRI Common Stock on Nasdaq on the
     day prior to announcement of such acquisition) to be delivered, and (3) the
     fair market value of any non-cash or non-PRI Common Stock consideration
     (including the issuance (or deemed issuance, by way of assumption or
     otherwise) of options or warrants to purchase PRI Common Stock in exchange
     for outstanding securities, rights, warrants or options to acquire any
     securities of another Person in connection with any such acquisition, and
     in any case as determined by the PRI Board of Directors in good faith as of
     the day prior to announcement of such acquisition) to be delivered to the
     seller or its security holders in connection with such acquisition, and (B)
     the amount of liabilities directly or indirectly assumed by PRI or its
     Subsidiaries or retired or defeased in connection with such acquisition,
     including contingent liabilities to the extent they can be estimated by the
     PRI Board of Directors in good faith as of the day prior to the
     announcement of such acquisition);

          (v) sell, lease, license, mortgage or otherwise create an Encumbrance
     on or otherwise dispose of any of its existing properties or assets
     (including securitizations) other than the sale of the E-machine machine
     shop and other than in the ordinary course of business consistent with past
     practice;

          (vi) acquire, purchase or lease capital assets or otherwise incur a
     capital expenditure in excess of $8 million in the aggregate;

          (vii) incur any indebtedness for borrowed money or issue any debt
     securities or assume, guarantee or endorse, or otherwise as an
     accommodation become responsible for the obligations of any Person for
     borrowed money for principal amounts in excess of $5 million on or before
     January 31, 2002 or for principal amounts in excess of $20 million after
     January 31, 2002, other than letters of credit issued for the benefit of
     customers of PRI in the ordinary course of business;

          (viii) accelerate, amend or change the period of exercisability of
     options or restricted stock granted (or permitted by this Agreement to be
     granted after the date hereof) under any PRI stock plan or authorize cash
     payments in exchange for any options granted (or permitted by this
     Agreement

                                       A-43


     to be granted after the date hereof) under any such plan except as required
     by the terms of such plan or any related agreements in effect as of the
     date of this Agreement;

          (ix) (A) increase the compensation payable or to become payable to its
     officers or employees, except for increases in salary, wages or bonus of
     employees in the ordinary course of business consistent with past practices
     (which include market adjustments), (B) grant any additional severance or
     termination benefits to, or enter into any severance agreements with, any
     employees or officers other than severance or termination payments to
     employees in connection with (i) reductions in force or (ii) terminations
     of individual employees by PRI in the normal course of business, provided
     that no such benefits or agreements shall be provided to any of PRI's
     directors or twenty highest paid current employees except in connection
     with a reduction in force and in a manner consistent with past practice for
     such reductions in force, (C) enter into any collective bargaining
     agreement (other than as required by Law), (D) establish, adopt, enter into
     or amend any Employee Benefit Plan for the benefit of any directors,
     officers or employees;

          (x) compromise or settle any Proceeding if such compromise or
     settlement would obligate PRI or any of its Subsidiaries to pay and/or
     assume liabilities greater than $3 million, individually or in the
     aggregate, or to take or refrain from any other action (other than as a
     result of a breach of this Agreement);

          (xi) except in the ordinary course of business consistent with past
     practice, modify or amend in any material respect or terminate any PRI
     Material Contract or waive, release or assign any material rights or claims
     thereunder; (xii) change in any material respect its accounting methods,
     principles or practices, except insofar as may be required by a generally
     applicable change in GAAP or a change in the rules and regulations of the
     SEC; or

          (xiii) authorize, or commit or agree to take, any of the foregoing
     actions, provided that the limitations set forth in this Section shall not
     apply to any transaction between PRI and any wholly owned Subsidiary or
     between any wholly owned Subsidiaries of PRI.

     (b) Except as required by Law, PRI shall not, and shall not permit any of
its Subsidiaries to, voluntarily take any action that would, or that could
reasonably be expected to, result in (i) any of its representations and
warranties set forth in this Agreement that are qualified as to materiality
becoming untrue or inaccurate at the Effective Time, (ii) any of such
representations and warranties that are not so qualified becoming untrue or
inaccurate in any material respect at the Effective Time, or (iii) any of the
conditions to the consummation of this Agreement and the transaction
contemplated hereby as set forth in Article IX not being satisfied.

     (c) PRI shall promptly advise Brooks orally and in writing to the extent it
has Knowledge of (i) any representation or warranty made by it contained in this
Agreement that is qualified as to materiality becoming untrue or inaccurate in
any respect or any such representation or warranty that is not so qualified
becoming untrue or inaccurate in any material respect, (ii) the failure by it or
any of its Subsidiaries to comply in any material respect with or satisfy in any
material respect any covenant, condition or agreement to be complied with or
satisfied by it under this Agreement and (iii) any Material Adverse Effect or
any change or event having, or which, insofar as can reasonably be foreseen,
could reasonably be expected to have a Material Adverse Effect on the truth of
their respective representations and warranties or the ability of the conditions
set forth in Article IX to be satisfied; provided, however, that no such
notification shall affect the representations, warranties, covenants or
agreements of the parties (or remedies with respect thereto) or the conditions
to the obligations of the parties under this Agreement.

SECTION 7.3  NO SOLICITATION BY PRI

     (a) PRI shall not, nor shall it permit any of its Subsidiaries to, nor
shall it authorize or permit any of its directors, officers or employees or any
investment banker, financial advisor, attorney, accountant or other
representative retained by it or any of its Subsidiaries to, directly or
indirectly through another Person, (i) solicit, initiate or encourage (including
by way of furnishing information), or take any other

                                       A-44


action designed to facilitate, any inquiries or the making of any proposal which
constitutes a PRI Takeover Proposal or (ii) participate in any discussions or
negotiations regarding any PRI Takeover Proposal; provided, however, that if the
Board of Directors of PRI determines in good faith, after consultation with its
outside counsel, that it is necessary to do so in order to act in a manner
consistent with its fiduciary duties to PRI's stockholders under applicable law,
PRI may, in response to a PRI Takeover Proposal which was not solicited by it,
which did not otherwise result from a breach of this Section, which the Board of
Directors of PRI determines in good faith, after consultation with a financial
advisor of nationally recognized reputation, is reasonably likely to lead to a
PRI Superior Proposal, and which is made Known to or received by PRI prior to
the obtaining of the PRI Stockholder Approval, and subject to providing prior
written notice of its decision to take such action to Brooks and compliance with
paragraph (c) below, (x) furnish information with respect to PRI and its
Subsidiaries to the person making such PRI Takeover Proposal pursuant to a
customary confidentiality agreement (as determined by PRI after consultation
with its outside counsel, the terms of which are no more favorable to such
person than the Confidentiality Agreement) and (y) participate in discussions or
negotiations regarding such PRI Takeover Proposal.

     (b) Except as expressly permitted by this Section, neither PRI nor the
Board of Directors of PRI nor any committee thereof shall (i) withdraw or
modify, or propose publicly to withdraw or modify, in a manner adverse to
Brooks, the approval or recommendation by such Board of Directors or such
committee of the Mergers or this Agreement, (ii) approve or recommend, or
propose publicly to approve or recommend, any PRI Takeover Proposal, or (iii)
cause PRI to enter into any express or implied letter of intent, agreement in
principle, acquisition agreement or other similar agreement (each, a "PRI
ACQUISITION AGREEMENT") related to any PRI Takeover Proposal. Notwithstanding
the foregoing, at any time prior to the obtaining of the PRI Stockholder
Approval, the Board of Directors of PRI, to the extent that it determines in
good faith, after consultation with its outside counsel, that it is necessary to
do so in order to act in a manner consistent with its fiduciary duties to PRI's
stockholders under applicable law, may (subject to this and the following
sentences) recommend any PRI Superior Proposal, but only at a time that is after
the fifth business day following Brooks' receipt of written notice advising
Brooks that the Board of Directors of PRI is prepared to recommend a PRI
Superior Proposal, specifying the terms and conditions of such PRI Superior
Proposal and identifying the person making such PRI Superior Proposal. During
this five business day period, Brooks may make, and in such event PRI shall
consider, a counterproposal to such PRI Superior Proposal, and, subject to the
fiduciary duties of PRI's Board of Directors, PRI (i) shall itself and shall
cause its financial and legal advisors to negotiate on its behalf with Brooks
with respect to the terms and conditions of such counterproposal for a
reasonable period of time given the terms and conditions of such counterproposal
and such PRI Superior Proposal, and (ii) shall accept such Brooks
counterproposal unless the Board of Directors of PRI determines in its good
faith judgment, after consultation with a financial advisor of nationally
recognized reputation, that such Brooks counterproposal is less favorable to
PRI's stockholders than such PRI Superior Proposal.

     (c) In addition to the obligations of PRI set forth in paragraphs (a) and
(b) of this Section, PRI shall immediately advise Brooks orally and in writing
of any request for information or of any PRI Takeover Proposal, the material
terms and conditions of such request or PRI Takeover Proposal and the identity
of the person making such request or PRI Takeover Proposal. PRI will keep Brooks
reasonably informed on a current basis of the status and details (including
amendments or proposed amendments) of any such request or PRI Takeover Proposal.

     (d) Nothing contained in this Section shall prohibit PRI from taking and
disclosing to its stockholders a position contemplated by Rule 14d-9 or Rule
14e-2 promulgated under the Exchange Act or from making any disclosure to PRI's
stockholders or the public if, in the good faith judgment of the Board of
Directors of PRI, after consultation with outside counsel, failure so to
disclose would be inconsistent with its obligations under applicable law;
provided, however, that, except as expressly permitted by this Section, neither
PRI nor its Board of Directors nor any committee thereof shall withdraw or
modify, or propose publicly to withdraw or modify, its position with respect to
this Agreement or the Mergers or approve or recommend, or propose publicly to
approve or recommend, a PRI Takeover Proposal.

                                       A-45


     (e) Nothing in this Section 7.3 shall (i) permit PRI to terminate this
Agreement (except as specifically provided in Section 10.1 hereof), (ii) permit
PRI to enter into any PRI Acquisition Agreement during the term of this
Agreement (it being agreed that during the term of this Agreement, PRI shall not
enter into any agreement with any person that provides for, or in any way
facilitates, a PRI Takeover Proposal (other than a confidentiality agreement of
the type referred to in Section 7.3(a) above)) or (iii) affect any other
obligation of PRI under this Agreement.

     (f) Nothing contained in this Section shall prohibit PRI from advising any
Person making a PRI Takeover Proposal that PRI is bound by the terms of this
Agreement or from negotiating the confidentiality agreement described in Section
7.3(a).

                      ARTICLE VIII.  ADDITIONAL AGREEMENTS

SECTION 8.1  PREPARATION OF REGISTRATION STATEMENT AND THE JOINT PROXY
             STATEMENT/PROSPECTUS; STOCKHOLDERS MEETINGS

     (a) As soon as practicable following the date of this Agreement, PRI and
Brooks shall prepare and file with the SEC (and, if applicable exemptions are
not available, with the Canadian Regulators under the MJDS Policy) a joint proxy
statement/prospectus (such joint proxy statement/prospectus, together with any
accompanying letters to stockholders, notices of meeting and forms of proxy,
shall be referred to herein as the "JOINT PROXY STATEMENT/PROSPECTUS") and
Brooks shall prepare and file with the SEC (and, if applicable, the Canadian
Regulators under the MJDS Policy) the Registration Statement, in which the Joint
Proxy Statement/Prospectus will be included as a prospectus. Each of PRI and
Brooks shall use reasonable efforts to have the Registration Statement declared
effective under the Securities Act (and to comply with the MJDS Policy, if
applicable) as promptly as practicable after such filing. PRI will use
reasonable efforts to cause the Joint Proxy Statement/Prospectus to be mailed to
PRI's stockholders, and Brooks will use reasonable efforts to cause the Joint
Proxy Statement/Prospectus to be mailed to Brooks' stockholders, in each case as
promptly as practicable after the Registration Statement is declared effective
under the Securities Act (and, if applicable, determined by Brooks and PRI to
comply with the MJDS Policy). Brooks shall take any action (other than
qualifying to do business in any jurisdiction in which Brooks or PRI is not now
so qualified or filing a general consent to service of process) required to be
taken under any applicable state and provincial securities laws in connection
with the issuance of Brooks Common Stock in the First Merger. PRI shall furnish
all information concerning itself and the holders of its stock as may be
reasonably requested in connection with any such action. No filing of, or
amendment or supplement to, the Registration Statement or the Joint Proxy
Statement/Prospectus will be made by any party without providing the other party
a reasonable opportunity to review and comment thereon. Brooks will advise PRI,
promptly after it receives notice thereof, of the time when the Registration
Statement has become effective or any supplement or amendment has been filed,
the issuance of any stop order, the suspension of the qualification of the
Brooks Common Stock issuable in connection with the First Merger for offering or
sale in any jurisdiction, or any request by the SEC or the Canadian Regulators
for amendment of the Joint Proxy Statement/Prospectus or the Registration
Statement or comments thereon and responses thereto or requests by the SEC or
the Canadian Regulators for additional information. To the extent required, PRI
will approve and will cause PRI Subco to approve the Amended Support Agreement
and the Amended Voting and Exchange Trust Agreement and any other matters
required as a result of the Mergers and the transactions contemplated hereby.

     (b) If, at any time prior to the Effective Time, any information relating
to PRI or Brooks, or any of their respective Affiliates, officers or directors,
is discovered by a party hereto which should be set forth in an amendment or
supplement to the Registration Statement or the Joint Proxy
Statement/Prospectus, so that any of such documents would not include any
misstatement of a material fact or omit to state any material fact necessary to
make the statements therein, in light of the circumstances under which they were
made, not misleading, the party which discovers such information shall promptly
notify the other parties hereto and an appropriate amendment or supplement
describing such information shall be promptly filed with the SEC and, to the
extent required by Law, disseminated to the stockholders of PRI and

                                       A-46


Brooks (and, if applicable, necessary action will be taken to comply with the
requirements of the Canadian Regulators).

     (c) PRI shall, as promptly as practicable after the Registration Statement
is declared effective under the Securities Act (and, if applicable, determined
by Brooks and PRI to comply with the MJDS Policy), duly call, give notice of,
convene and hold a meeting of its stockholders (the "PRI STOCKHOLDERS MEETING")
in accordance with the MBCL for the purpose of obtaining the PRI Stockholder
Approval and shall, through its Board of Directors, recommend to its
stockholders the approval and adoption of this Agreement, the Mergers and the
other transactions contemplated hereby; provided however, that in the event of a
PRI Takeover Proposal the Board of Directors of PRI may withdraw or modify such
recommendation if (but only if) (i) the Board of Directors of PRI has received a
PRI Superior Proposal and (ii) PRI has complied with the provisions of Section
7.3, but any such withdrawal of recommendation shall not obviate the obligation
to hold the PRI Stockholders Meeting.

     (d) Brooks shall, as promptly as practicable after the Registration
Statement is declared effective under the Securities Act (and, if applicable,
determined by Brooks and PRI to comply with the MJDS Policy), duly call, give
notice of, convene and hold a meeting of its stockholders (the "BROOKS
STOCKHOLDERS MEETING") in accordance with the DGCL for the purpose of obtaining
the Brooks Stockholder Approval and shall, through its Board of Directors,
recommend to its stockholders the approval and adoption of this Agreement, the
Mergers and the other transactions contemplated hereby.

     (e) Brooks and PRI will use best efforts to hold the PRI Stockholders
Meeting and the Brooks Stockholders Meeting on the same date and as soon as
reasonably practicable after the effectiveness of the Registration Statement
(and, if applicable, compliance with the MJDS Policy) and each will use its best
efforts to solicit from its stockholders proxies in favor of this Agreement and
the Mergers.

     (f) At the Brooks Stockholders Meeting, Brooks shall submit to the
stockholders of Brooks in accordance with the DGCL a proposal to change the name
of Brooks in accordance with Section 2.9 hereof, and shall, through its Board of
Directors, recommend to its stockholders the approval of such change in the name
of Brooks. Brooks will use its best efforts to solicit from its stockholders
proxies in favor of such change in the name of Brooks. If the stockholders of
Brooks approve such change in the name of Brooks, Brooks shall not, for a period
of one year, make any further change in its name (including any change for
purposes of doing business).

     (g) As soon as practicable after the date of this Agreement, Brooks shall
make all necessary filings with respect to the Mergers under the Securities Act
and the Exchange Act and the rules and regulations thereunder and applicable
Canadian securities laws.

SECTION 8.2  LETTERS OF PRI'S ACCOUNTANTS

     PRI shall use reasonable efforts to cause to be delivered to Brooks two
letters from PRI's independent accountants, one dated a date within two business
days before the date on which the Registration Statement shall become effective
and one dated a date within two business days before the Closing Date, each
addressed to Brooks, in form and substance reasonably satisfactory to Brooks and
customary in scope and substance for comfort letters delivered by independent
public accountants in connection with registration statements similar to the
Registration Statement.

SECTION 8.3  LETTERS OF BROOKS' ACCOUNTANTS

     Brooks shall use reasonable efforts to cause to be delivered to PRI two
letters from Brooks' independent accountants, one dated a date within two
business days before the date on which the Registration Statement shall become
effective and one dated a date within two business days before the Closing Date,
each addressed to PRI, in form and substance reasonably satisfactory to PRI and
customary in scope and substance for comfort letters delivered by independent
public accountants in connection with registration statements similar to the
Registration Statement.

                                       A-47


SECTION 8.4  ACCESS TO INFORMATION; CONFIDENTIALITY

     Subject to the Confidentiality Agreement and subject to restrictions
contained in confidentiality agreements to which such party is subject (which
such party will use its best efforts to have waived) and applicable Law, upon
reasonable notice, each of PRI and Brooks shall, and shall cause its
Subsidiaries to, afford to the other party and to the officers, employees,
accountants, counsel, financial advisors and other representatives of such other
party, reasonable access during normal business hours during the period prior to
the Effective Time to all properties, books, contracts, commitments, personnel
and records of itself and its Subsidiaries. During such period, each of PRI and
Brooks shall, and shall cause its Subsidiaries to, furnish promptly to the other
party (a) a copy of each report, schedule, registration statement and other
document filed or received by it during such period pursuant to the requirements
of federal or state securities laws and (b) all other information concerning its
business, properties and personnel as such other party may reasonably request.
No review pursuant to this Section 8.4 shall affect any representation or
warranty given by the other party hereto. Each of PRI and Brooks will hold, and
will cause its officers, employees, accountants, counsel, financial advisors and
other representatives and Affiliates to hold, any nonpublic information in
accordance with the terms of the Confidentiality Agreement.

SECTION 8.5  BEST EFFORTS

     (a) Upon the terms and subject to the conditions set forth in this
Agreement, each of the parties agrees to use its best efforts to take, or cause
to be taken, all actions, and to do, or cause to be done, and to assist and
cooperate with the other parties in doing, all things necessary, proper or
advisable to consummate and make effective, in the most expeditious manner
practicable, the Mergers and the other transactions contemplated by this
Agreement, and to satisfy the conditions set forth in Article IX hereof,
including (i) the obtaining of all actions or non-actions, waivers, consents,
approvals, exemptions, authorizations and Orders from Governmental Authorities
and the making of all declarations, registrations and filings and the taking of
all steps as may be necessary to obtain an approval or waiver from, or to avoid
any Proceeding by, any Governmental Authority, (ii) the obtaining of all
consents, approvals or waivers from third parties that are (A) necessary to
consummate the transactions contemplated hereby, (B) required to be disclosed in
the Brooks Disclosure Schedule or the PRI Disclosure Schedule, as the case may
be, or (C) required to prevent a PRI Material Adverse Effect or a Brooks
Material Adverse Effect from occurring before or after the Effective Time, (iii)
the defending of any Proceedings challenging this Agreement or the consummation
of the transactions contemplated by this Agreement, including seeking to have
any Order entered by any Governmental Authority vacated or reversed, and (iv)
the execution and delivery of any additional instruments necessary to consummate
the transactions contemplated by, and to fully carry out the purposes of, this
Agreement. Nothing set forth in this Section 8.5 will limit or affect actions
permitted to be taken pursuant to Section 7.3.

     (b) Without limiting the foregoing, PRI and Brooks shall (i) take all
action necessary to ensure that no state "fair price," "business combination,"
"moratorium," "control share acquisition" or other form of antitakeover Law is
or becomes applicable to the Mergers, this Agreement, or any of the other
transactions contemplated by this Agreement and (ii) if any such Law becomes
applicable to the Mergers, this Agreement, or any other transaction contemplated
by this Agreement, take all action necessary to ensure that the Mergers and the
other transactions contemplated by this Agreement may be consummated as promptly
as practicable on the terms contemplated by this Agreement and otherwise to
minimize the effect of such Law on the Mergers and the other transactions
contemplated by this Agreement.

SECTION 8.6  INDEMNIFICATION, EXCULPATION AND INSURANCE

     (a) Brooks agrees to maintain in effect in accordance with their terms all
rights to indemnification, exculpation from liabilities and reimbursement of
expenses for acts or omissions occurring at or prior to the Effective Time now
existing in favor of the current or former directors or officers of PRI and its
Subsidiaries as provided in their Organizational Documents and any
indemnification contracts between PRI and their respective current or former
directors and officers. In addition, from and after the Effective Time, persons
who become directors or officers of Brooks pursuant to this Agreement or
otherwise in

                                       A-48


connection with the Mergers will be entitled to rights and protections with
respect to indemnity, exculpation and reimbursement of expenses at least as
favorable to them as the rights and protections held by the directors and
officers of Brooks immediately before the Effective Time.

     (b) In the event that Brooks or its successor or assign (i) consolidates
with or merges into any other person and is not the continuing or surviving
corporation or Person of such consolidation or merger or (ii) transfers or
conveys all or substantially all of its properties and assets to any Person,
then, and in each such case, proper provision will be made so that such
successor or assign assumes the obligations set forth in this Section.

     (c) The provisions of this Section (i) are intended to be for the benefit
of, and will be enforceable by, each indemnified party, his or her heirs and his
or her representatives and (ii) are in addition to, and not in substitution for,
any other rights to indemnification or contribution that any such person may
have by contract or otherwise.

SECTION 8.7  FEES AND EXPENSES

     (a) Except as provided in this Section, all fees and expenses incurred in
connection with the Mergers, this Agreement, and the transactions contemplated
by this Agreement shall be paid by the party incurring such fees or expenses,
whether or not the Mergers are consummated, except that each of Brooks and PRI
shall bear and pay one-half of the costs and expenses incurred in connection
with the filing, printing and mailing of the Registration Statement and the
Joint Proxy Statement/Prospectus (including SEC filing fees).

     (b) In the event that (i) (A) a PRI Takeover Proposal shall have been made
Known to PRI or any of its Subsidiaries or shall have been made directly to
PRI's stockholders generally or any Person shall have publicly announced an
intention (whether or not conditional) to make a PRI Takeover Proposal, and (B)
thereafter this Agreement is terminated by either Brooks or PRI pursuant to
Section 10.1(b)(ii) or by Brooks pursuant to Section 10.1(c) (but only if such
termination is based upon PRI's failure to perform any of its covenants or
agreements contained herein), (ii) (A) there is a material breach by PRI (acting
through one of its executive officers, directors or authorized investment
bankers or counsel) of Section 7.3(a) of this Agreement which is not cured
within 24 hours after PRI's Chairman, Chief Executive Officer, Chief Financial
Officer or Vice President of Strategic Business Development becomes aware of the
breach and (B) thereafter this Agreement is terminated by Brooks pursuant to
Section 10.1(c) (but only if such termination is based upon PRI's failure to
perform any of its covenants or agreements contained in Section 7.3(a) of this
Agreement), or (iii) this Agreement is terminated by Brooks pursuant to Section
10.1(e), then PRI in either case shall promptly, but in no event later than two
days after the date of such termination, pay Brooks a fee equal to $14,000,000
plus the reasonable out-of-pocket expenses of Brooks incurred since October 1,
2001 and paid in connection with the transactions contemplated by this Agreement
(together, the "PRI TERMINATION FEE"), payable by wire transfer of same day
funds; provided, however, that no PRI Termination Fee shall be payable to Brooks
pursuant to clause (i) of this paragraph (b) unless and until within 12 months
after such termination PRI or any of its Subsidiaries enters into any PRI
Acquisition Agreement pursuant to such PRI Takeover Proposal (or any other
transaction with the Person making such PRI Takeover Proposal or any Affiliate
of such Person, which transaction would itself be a PRI Takeover Proposal) or
any such PRI Takeover Proposal (or any other transaction with the Person making
such PRI Takeover Proposal or any Affiliate of such Person, which transaction
would itself be a PRI Takeover Proposal) is consummated, in which event the PRI
Termination Fee shall be payable upon the first to occur of such events. For
purposes of Section 8.7(b)(ii), (x) materiality shall be determined by reference
to the effect of the action on the completion of the Mergers and (y) a breach
shall be deemed cured if, within the time frame specified, either (A) PRI shall
disavow in writing the action that constituted such breach, (B) Brooks shall
request such a disavowal in a written form reasonably acceptable to PRI, and PRI
shall have provided such disavowal within 48 hours after such request, or (C)
PRI shall inform Brooks of the breach and Brooks shall not request such a
written disavowal. PRI acknowledges that the agreements contained in this
Section are an integral part of the transactions contemplated by this Agreement,
and that, without these

                                       A-49


agreements, Brooks would not enter into this Agreement; accordingly, if PRI
fails promptly to pay the amount due pursuant to this paragraph (b), and, in
order to obtain such payment, Brooks commences a suit which results in a
judgment against PRI for the fee set forth in this paragraph (b), PRI shall pay
to Brooks its costs and expenses (including attorneys' fees and expenses) in
connection with such suit, together with interest on the amount of the fee at
the prime rate of ABN Amro in effect on the date such payment was required to be
made.

SECTION 8.8  PUBLIC ANNOUNCEMENTS

     Brooks and PRI will consult with each other a reasonable time before
issuing, and provide each other a reasonable opportunity to review, comment upon
and concur with and use reasonable efforts to agree on, any press release or
other public statements with respect to the transactions contemplated by this
Agreement, including the Mergers, and shall not issue any such press release or
make any such public statement prior to such consultation, except as either
party may determine is required by applicable Law, court process or by
obligations pursuant to any listing agreement with any securities exchange or
stock market on which listed.

SECTION 8.9  STOCK LISTING

     Until the earlier of the termination of this Agreement or the Effective
Time, PRI shall continue the quotation of the PRI Common Stock on Nasdaq. Brooks
shall use best efforts to cause the Brooks Common Stock issuable under Article
III, including Brooks Common Stock issuable upon exercise of the PRI Options and
PRI Warrants to purchase share of Brooks Common Stock described in Section 3.4
and upon the exchange, redemption or retraction of the PRI Exchangeable Shares,
to be approved for listing on Nasdaq, subject to official notice or issuance, as
promptly as practicable after the date hereof, and in any event prior to the
Closing Date.

SECTION 8.10  TAX TREATMENT

     Each of Brooks and PRI shall use best efforts to cause the Mergers to
qualify as a reorganization under the provisions of Section 368 of the Code and
to obtain the opinions of counsel referred to in Sections 9.1(h). After the
Effective Time, Brooks shall continue the historic business of PRI or use a
significant portion of PRI's historic business assets in a business and shall
use its best efforts to avoid taking any action that would cause the Mergers to
fail to qualify as a reorganization under the provisions of such Section 368.

SECTION 8.11  CONVEYANCE TAXES

     Brooks and PRI shall cooperate in the preparation, execution and filing of
all Tax Returns or other documents regarding any real property transfer or gains
taxes, or other Taxes, any transfer, recording, registration and other fees or
any similar Taxes which become payable in connection with the transactions
contemplated by this Agreement that are required or permitted to be filed at or
before the Effective Time. Brooks shall pay, and PRI shall pay, without
deduction or withholding from any amount payable to the holders of their Common
Stock, any such Taxes imposed by any Governmental Authority (and any penalties
and interest with respect to such Taxes), which become payable in connection
with the transactions contemplated by this Agreement, on behalf of their
respective stockholders.

SECTION 8.12  RESTRAINTS

     Each of the parties shall use its best efforts to prevent the entry of any
Restraints and to appeal as promptly as possible any Restraints that may be
entered.

SECTION 8.13  SECTION 16 MATTERS

     Before the Effective Time, the Board of Directors of Brooks shall adopt
such resolutions, in form and substance reasonably satisfactory to Brooks and
PRI, as are necessary to exempt from the application of

                                       A-50


Section 16(b) of the Exchange Act the acquisition of any security of Brooks
pursuant to or in connection with the Mergers by any person who becomes a
director or officer of Brooks, as those terms are defined in Rule 16a-1 under
the Exchange Act, pursuant to this Agreement or otherwise in connection with the
Mergers and the other transactions contemplated hereby.

SECTION 8.14  BENEFIT PLANS

     (a) As soon as administratively practicable after the Effective Time,
Brooks shall take all reasonable action so that employees of PRI and its
Subsidiaries shall be entitled to participate in each Brooks Employee Benefit
Plan to the same extent as similarly-situated employees of Brooks and its
Subsidiaries (it being understood that inclusion of the employees of PRI and its
Subsidiaries in the Brooks Employee Benefit Plans may occur at different times
with respect to different plans). Brooks shall cause each Brooks Employee
Benefit Plan in which employees of PRI and its Subsidiaries are eligible to
participate to take into account for purposes of eligibility and vesting
thereunder the service of such employees with PRI and its Subsidiaries to the
same extent as such service was credited for such purposes by PRI.

     (b) Brooks shall honor and continue to be obligated to perform, in
accordance with their terms, all benefit obligations to, and contractual rights
of, current and former employees of PRI existing as of the Effective Date, as
well as all employment or severance agreements, plans or policies of PRI.

     (c) If employees of PRI or any of its Subsidiaries become eligible to
participate in a medical, dental or vision benefits plan of Brooks, Brooks shall
cause each such plan to (i) waive any preexisting condition limitations to the
extent such conditions are covered under the applicable medical, dental or
vision benefits plans of Brooks, (ii) honor under such plans any deductible,
co-payment and out-of-pocket expenses incurred by the employees and their
beneficiaries during the portion of the calendar year prior to such
participation and (iii) waive any waiting period limitation or evidence of
insurability requirement which would otherwise be applicable to such employee on
or after the Effective Time to the extent such employee had satisfied any
similar limitation or requirement under an analogous PRI Employee Benefit Plan
prior to the Effective Time.

                        ARTICLE IX. CONDITIONS PRECEDENT

SECTION 9.1  CONDITIONS TO EACH PARTY'S OBLIGATION TO EFFECT THE MERGERS

     The obligation of each party to effect the First Merger and the other
transactions contemplated by this Agreement (other than the Second Merger) is
subject to the satisfaction or waiver on or prior to the Closing Date of the
following conditions:

          (a) Stockholder Approvals.  Each of the PRI Stockholder Approval and
     the Brooks Stockholder Approval shall have been obtained.

          (b) HSR ACT.  The waiting period (and any extension thereof)
     applicable to the First Merger under the HSR Act shall have been terminated
     or shall have expired.

          (c) Approvals.  Other than the filings provided for under Section 2.5,
     all Orders, consents, waivers, exemptions, approvals or authorizations of,
     declarations, filings or registrations with, or giving of notice to, any
     Person or Governmental Authority required of PRI, Brooks, or any of their
     Subsidiaries to consummate this Agreement, the First Merger and the other
     transactions contemplated hereby (other than the Second Merger), the
     failure of which to be obtained or made (i) is reasonably expected to have
     a Material Adverse Effect on Brooks and its Subsidiaries, taken as a whole,
     or (ii) will result in a violation of any Laws, shall have been obtained or
     made, all in form and substance reasonably satisfactory to PRI and Brooks.

          (d) No Injunctions or Restraints.  No Order or Law entered, enacted,
     promulgated, enforced or issued by any Governmental Authority of competent
     jurisdiction or other legal restraint or prohibition (collectively,
     "RESTRAINTS") shall be in effect (i) preventing the consummation of the
     Mergers, or

                                       A-51


     (ii) which otherwise is reasonably likely to have a Material Adverse Effect
     on PRI or Brooks, as applicable.

          (e) Registration Statement.  The Registration Statement shall have
     become effective under the Securities Act prior to the mailing of the Joint
     Proxy Statement/Prospectus by each of PRI and Brooks to their respective
     stockholders, and no stop order or proceedings seeking a stop order shall
     be threatened by the SEC or shall have been initiated by the SEC. The Joint
     Proxy Statement/ Prospectus shall not on the Closing Date be subject to any
     similar proceedings commenced or threatened by the Canadian Regulators.

          (f) Stock Listing.  The shares of Brooks Common Stock issuable to
     PRI's stockholders as contemplated by Article III, and the shares of Brooks
     Common Stock issuable upon exercise of PRI Options and PRI Warrants
     described in Section 3.4 and upon the exchange, redemption or retraction of
     the PRI Exchangeable Shares, shall have been approved for listing on the
     Nasdaq National Market, subject to official notice of issuance. The Toronto
     Stock Exchange shall have approved the continued listing of the PRI
     Exchangeable Shares on such exchange.

          (g) Shelf Registration Statement.  Brooks shall be eligible to file
     and shall have filed a registration statement on Form S-3 pursuant to Rule
     415 under the Securities Act with respect to the issuance of shares of
     Brooks Common Stock to the holders of PRI Exchangeable Shares upon the
     exchange, redemption or retraction thereof in accordance with the PRI
     Exchangeable Share Provisions; such registration statement shall have
     become effective under the Securities Act, and no stop order or proceedings
     seeking a stop order shall be threatened by the SEC or shall have been
     initiated by the SEC.

          (h) Tax Opinion.  Brooks shall have received from Ropes & Gray, tax
     counsel to Brooks, and PRI shall have received from Foley, Hoag & Eliot
     LLP, tax counsel to PRI, on a date within three business days prior to the
     mailing of the Joint Proxy Statement/Prospectus and on the Closing Date,
     opinions, in each case dated as of such respective dates, to the effect
     that the Mergers will constitute a reorganization within the meaning of
     Section 368 of the Code. In rendering such opinions, counsel for Brooks and
     PRI shall be entitled to rely upon representations of officers of Brooks
     and PRI substantially in the form of Exhibits 9.1(h)A and 9.1(h)B hereto.

SECTION 9.2  CONDITIONS TO OBLIGATIONS OF BROOKS

     The obligation of Brooks to effect the First Merger and the other
transactions contemplated by this Agreement (other than the Second Merger) is
further subject to satisfaction or waiver of the following conditions:

          (a) Representations and Warranties.  The representations and
     warranties of PRI set forth herein shall be true and correct both when made
     and at and as of the Closing Date, as if made at and as of such time
     (except to the extent expressly made as of an earlier date, in which case
     as of such date), except where the failure of such representations and
     warranties to be so true and correct (without giving effect to any
     limitation as to "materiality" or Material Adverse Effect set forth
     therein) does not have, and is not likely to have, individually or in the
     aggregate, a Material Adverse Effect on PRI.

          (b) Performance of Obligations of PRI.  PRI shall have performed in
     all material respects all obligations required to be performed by it under
     this Agreement at or prior to the Closing Date.

          (c) No Material Adverse Change.  At any time after the date of this
     Agreement there shall not have occurred any Material Adverse Change
     relating to PRI.

          (d) PRI Exchangeable Share Matters.  (A) PRI shall have received all
     approvals necessary from PRI Canada and such other persons as shall be
     necessary under the PRI Exchangeable Share Provisions, the Amended Support
     Agreement and Amended Voting and Exchange Trust Agreement entered into by
     PRI in connection with the PRI Exchangeable Shares and applicable Law in

                                       A-52


     connection with the Mergers and all transactions contemplated under this
     Agreement and (B) if required, the Amended MRRS Decision Document shall
     have been obtained.

SECTION 9.3  CONDITIONS TO OBLIGATIONS OF PRI

     The obligation of PRI to effect the First Merger and the other transactions
contemplated by this Agreement (other than the Second Merger) is further subject
to satisfaction or waiver of the following conditions:

          (a) Representations and Warranties.  The representations and
     warranties of Brooks set forth herein shall be true and correct both when
     made and at and as of the Closing Date, as if made at and as of such time
     (except to the extent expressly made as of an earlier date, in which case
     as of such date), except where the failure of such representations and
     warranties to be so true and correct (without giving effect to any
     limitation as to "materiality," or Material Adverse Effect set forth
     therein) does not have, and is not likely to have, individually or in the
     aggregate, a Material Adverse Effect on Brooks.

          (b) Performance of Obligations of Brooks.  Brooks shall have performed
     in all material respects all obligations required to be performed by it
     under this Agreement at or prior to the Closing Date.

          (c) No Material Adverse Change.  At any time after the date of this
     Agreement there shall not have occurred any Material Adverse Change
     relating to Brooks.

          (d) PRI Exchangeable Share Matters.  (A) PRI shall have received all
     approvals necessary from PRI Canada and such other persons as shall be
     necessary under the PRI Exchangeable Share Provisions, the Amended Support
     Agreement and Amended Voting and Exchange Trust Agreement entered into by
     PRI in connection with the PRI Exchangeable Shares and applicable Law in
     connection with the Mergers and all transactions contemplated under this
     Agreement, (B) Brooks shall have entered into the Amended Support Agreement
     and Amended Voting and Exchange Trust Agreement and created the Brooks
     Special Voting Share, and (C) if required, the Amended MRRS Decision
     Document shall have been obtained.

SECTION 9.4  FRUSTRATION OF CLOSING CONDITIONS

     Neither Brooks nor PRI may rely on the failure of any condition set forth
in Section 9.1, 9.2 or 9.3, as the case may be, to be satisfied if such failure
was caused by such party's failure to use best efforts to consummate the First
Merger and the other transactions contemplated by this Agreement (other than the
Second Merger), as required by and subject to Section 8.5.

                 ARTICLE X.  TERMINATION, AMENDMENT AND WAIVER

SECTION 10.1  TERMINATION

     This Agreement may be terminated at any time prior to the Effective Time,
(and whether before or after the PRI Stockholder Approval or the Brooks
Stockholder Approval):

          (a) by mutual written consent of Brooks and PRI;

          (b) by either Brooks or PRI if: (i) the First Merger shall not have
     been consummated by July 31, 2002; provided, however, that the right to
     terminate this Agreement pursuant to this Section 10.1(b)(i) shall not be
     available to any party whose failure to perform any of its obligations
     under this Agreement results in the failure of the First Merger to be
     consummated by such time; provided, further, that this Agreement may be
     extended by not more than 30 calendar days by either party by written
     notice to the other party if the First Merger shall not have been
     consummated as a direct result of Brooks or PRI having failed to receive
     all regulatory approvals required to be obtained with respect to the First
     Merger; (ii) the PRI Stockholder Approval shall not have been obtained at a

                                       A-53


     PRI Stockholders Meeting duly convened therefor (including any adjournment
     or postponement thereof); (iii) the Brooks Stockholder Approval shall not
     have been obtained at a Brooks Stockholders Meeting duly convened therefor
     (including any adjournment or postponement thereof); or (iv) any Restraint
     having any of the effects set forth in Section 9.1(d) shall be in effect
     and shall have become final and nonappealable, provided, that the party
     seeking to terminate this Agreement pursuant to this paragraph (b)(iv)
     shall have used its best efforts to prevent the entry of and to remove such
     Restraint;

          (c) by Brooks, if PRI shall have breached or failed to perform in any
     material respect any of its representations, warranties, covenants or other
     agreements contained in this Agreement, which breach or failure to perform
     (A) would give rise to the failure of a condition set forth in Section
     9.2(a) or (b), and (B) is incapable of being cured by PRI or is not cured
     within 45 days of written notice thereof from Brooks;

          (d) by PRI, if Brooks shall have breached or failed to perform in any
     material respect any of its representations, warranties, covenants or other
     agreements contained in this Agreement, which breach or failure to perform
     (A) would give rise to the failure of a condition set forth in Section
     9.3(a) or (b), and (B) is incapable of being cured by Brooks or is not
     cured within 45 days of written notice thereof from PRI;

          (e) by Brooks, if (i) PRI, the Board of Directors of PRI or any
     committee thereof shall have recommended to the stockholders of PRI any PRI
     Takeover Proposal; (ii) PRI, the Board of Directors of PRI or any committee
     thereof shall for any reason have withdrawn or shall have amended or
     modified in a manner adverse to Brooks its recommendation of this Agreement
     and the First Merger; (iii) PRI shall have failed to include its
     recommendation of this Agreement and the First Merger in the Joint Proxy
     Statement/Prospectus or Registration Statement; or (iv) a tender or
     exchange offer relating to 15% or more of the shares of PRI Common Stock
     shall have been commenced by a Person unaffiliated with Brooks, and PRI
     shall not have published, sent or given to its securityholders pursuant to
     Rule 14d-9 or 14e-2 promulgated under the Exchange Act, within ten business
     days after such tender or exchange offer is first published, sent or given
     and made known to PRI, a statement recommending rejection of such tender or
     exchange offer; or

          (f) by PRI, if (i) Brooks, the Board of Directors of Brooks or any
     committee thereof shall for any reason have withdrawn or shall have amended
     or modified in a manner adverse to PRI its recommendation of this Agreement
     and the Mergers or (ii) Brooks shall have failed to include its
     recommendation of this Agreement and the Mergers in the Joint Proxy
     Statement/Prospectus or Registration Statement.

SECTION 10.2  EFFECT OF TERMINATION

     In the event of termination of this Agreement by either PRI or Brooks as
provided in Section 10.1, this Agreement shall forthwith become void and have no
effect, without any liability or obligation on the part of Brooks, Brooks Merger
Sub, or PRI other than the provisions of Section 8.7, this Article X, Article XI
and the Confidentiality Agreement, which provisions shall survive such
termination, and except that a party shall remain liable to the extent that such
termination results from the willful and material breach by such party of any of
its representations, warranties, covenants or agreements set forth in this
Agreement.

SECTION 10.3  AMENDMENT

     This Agreement may be amended by the parties at any time before or after
the PRI Stockholder Approval or the Brooks Stockholder Approval; provided,
however, that after any such approval, there shall not be made any amendment
that by Law requires further approval by the stockholders of PRI or Brooks
without the further approval of such stockholders. This Agreement may not be
amended except by an instrument in writing signed on behalf of each of the
parties.

                                       A-54


SECTION 10.4  EXTENSION; WAIVER

     At any time prior to the Effective Time, a party may (a) extend the time
for the performance of any of the obligations or other acts of the other
parties, (b) waive any inaccuracies in the representations and warranties of the
other parties contained in this Agreement or in any document delivered pursuant
to this Agreement or (c) subject to the proviso of Section 10.3, waive
compliance by the other party with any of the agreements or conditions contained
in this Agreement. Any agreement on the part of a party to any such extension or
waiver shall be valid only if set forth in an instrument in writing signed on
behalf of such party. The failure of any party to this Agreement to assert any
of its rights under this Agreement or otherwise shall not constitute a waiver of
such rights, nor will any single or partial exercise of any right preclude any
other or further exercise thereof or of any other right.

SECTION 10.5  PROCEDURE FOR TERMINATION, AMENDMENT, EXTENSION OR WAIVER

     A termination of this Agreement pursuant to Section 10.1, an amendment of
this Agreement pursuant to Section 10.3 or an extension or waiver pursuant to
Section 10.4 shall, in order to be effective, require, in the case of Brooks or
PRI, action by its Board of Directors or, with respect to any amendment to this
Agreement, a duly authorized committee of its Board of Directors to the extent
permitted by Law.

                        ARTICLE XI.  GENERAL PROVISIONS

SECTION 11.1  NONSURVIVAL OF REPRESENTATIONS AND WARRANTIES

     None of the representations and warranties in this Agreement or in any
instrument delivered pursuant to this Agreement shall survive the Effective
Time. This Section 11.1 shall not limit any covenant or agreement of the parties
which by its terms contemplates performance after the Effective Time.

SECTION 11.2  NOTICES

     All notices, requests, claims, demands and other communications under this
Agreement shall be in writing and shall be deemed given if delivered personally,
mailed by registered or certified mail (return receipt requested), telecopied
(which is confirmed) or sent by overnight courier (providing proof of delivery)
to the parties at the following addresses (or at such other address for a party
as shall be specified by like notice):

        (a) if to Brooks, to

            Brooks Automation, Inc.
            15 Elizabeth Drive
            Chelmsford, MA 01824
            Attn: President
            (978) 262-2400

            with a copy to:
            Brown, Rudnick, Freed & Gesmer
            One Financial Center
            Boston, MA 02111
            Attn: David H. Murphree, Esquire
            (617) 856-8200

        (b) if to PRI, to

            PRI Automation, Inc.
            805 Middlesex Turnpike
            Billerica, MA 01821
            Attn: President
            (978) 670-9430

                                       A-55


            with a copy to:

            Foley, Hoag & Eliot LLP
            One Post Office Square
            Boston, MA 02109
            Attn: Robert L. Birnbaum, Esquire
            (617) 832-7000

        (c) if to Brooks Merger Sub, to Brooks as provided herein.

SECTION 11.3  INTERPRETATION

     When a reference is made in this Agreement to an Article, Section or
Exhibit, such reference shall be to an Article or Section of, or an Exhibit to,
this Agreement unless otherwise indicated. Whenever the words "include,"
"includes" or "including" are used in this Agreement, they shall be deemed to be
followed by the words "without limitation." The words "hereof," "herein" and
"hereunder" and words of similar import when used in this Agreement shall refer
to this Agreement as a whole and not to any particular provision of this
Agreement. All terms defined in this Agreement shall have the defined meanings
when used in any certificate or other document made or delivered pursuant hereto
unless otherwise defined therein. The definitions contained in this Agreement
are applicable to the singular as well as the plural forms of such terms and to
the masculine as well as to the feminine and neuter genders of such term. Any
agreement, instrument or Law defined or referred to herein or in any agreement
or instrument that is referred to herein means such agreement, instrument or Law
as from time to time amended, modified or supplemented, including (in the case
of agreements or instruments) by waiver or consent and (in the case of Laws) by
succession of comparable successor Laws and references to all attachments
thereto and instruments incorporated therein. References to a Person are also to
its permitted successors and assigns.

SECTION 11.4  COUNTERPARTS

     This Agreement may be executed in one or more counterparts, all of which
shall be considered one and the same agreement and shall become effective when
one or more counterparts have been signed by each of the parties and delivered
to the other parties.

SECTION 11.5  ENTIRE AGREEMENT; NO THIRD-PARTY BENEFICIARIES

     This Agreement (including the documents and instruments referred to herein)
and the Confidentiality Agreement (a) constitute the entire agreement, and
supersede all prior agreements and understandings, both written and oral,
between the parties with respect to the subject matter of this Agreement and the
Confidentiality Agreement and (b) except for the provisions of Article III and
Section 8.6, are not intended to confer upon any Person other than the parties
any rights or remedies. By execution and delivery of this Agreement, the parties
hereby amend the Confidentiality Agreement to delete Section 9 thereof,
effective as of the date hereof, provided that such amendment shall not
constitute a waiver by a party of its rights to seek and obtain a remedy for any
breach or violation of such Section 9 prior to such execution and delivery.

SECTION 11.6  GOVERNING LAW

     This Agreement shall be governed by, and construed in accordance with, the
laws of the State of Delaware, regardless of the laws that might otherwise
govern under applicable principles of conflict of laws thereof.

SECTION 11.7  ASSIGNMENT

     Neither this Agreement nor any of the rights, interests or obligations
under this Agreement shall be assigned, in whole or in part, by operation of law
or otherwise by any of the parties hereto without the

                                       A-56


prior written consent of the other parties. Any assignment in violation of the
preceding sentence shall be void. Subject to the preceding two sentences, this
Agreement will be binding upon, inure to the benefit of, and be enforceable by,
the parties and their respective successors and assigns.

SECTION 11.8  CONSENT TO JURISDICTION

     Each of the parties hereto (a) consents to and does hereby submit itself to
the personal jurisdiction of any federal court located in the Commonwealth of
Massachusetts or a Massachusetts state court in the event any dispute arises out
of this Agreement or any of the transactions contemplated by this Agreement, (b)
agrees that it will not attempt to deny or defeat such personal jurisdiction by
motion or other request for leave from any such court, and (c) agrees that it
will not bring any action relating to this Agreement or any of the transactions
contemplated by this Agreement in any court other than a federal court sitting
in the Commonwealth of Massachusetts or a Massachusetts state court.

SECTION 11.9  HEADINGS

     The table of contents and headings contained in this Agreement are for
reference purposes only and shall not affect in any way the meaning or
interpretation of this Agreement.

SECTION 11.10  SEVERABILITY

     If any term or other provision of this Agreement is determined by a court
of competent jurisdiction to be invalid, illegal or incapable of being enforced
by any Law or public policy, all other terms and provisions of this Agreement
shall nevertheless remain in full force and effect. Upon such determination that
any term or other provision is invalid, illegal or incapable of being enforced,
the parties hereto shall negotiate in good faith to modify this Agreement so as
to effect the original intent of the parties as closely as possible to the
fullest extent permitted by applicable Law in an acceptable manner to the end
that the transactions contemplated hereby are fulfilled to the extent possible.

            [The remainder of this page is intentionally left blank]

                                       A-57


     IN WITNESS WHEREOF, Brooks Automation, Inc., Pontiac Acquisition Corp. and
PRI Automation, Inc. have caused this Agreement to be signed by their respective
officers thereunto duly authorized, all as of the date first written above.

[seal]                                    BROOKS AUTOMATION, INC.

                                          By: /s/ ROBERT J. THERRIEN
                                            ------------------------------------
                                              President and Chief Executive
                                              Officer

[seal]                                    PONTIAC ACQUISITION CORP.

                                          By: /s/ ROBERT J. THERRIEN
                                            ------------------------------------
                                              President

[seal]                                    PRI AUTOMATION, INC.

                                          By: /s/ MITCHELL G. TYSON
                                            ------------------------------------
                                              President and Chief Executive
                                              Officer

                                          By: /s/ COSMO S. TRAPANI
                                            ------------------------------------
                                              Treasurer and Chief Financial
                                              Officer

                                       A-58


                                                                      APPENDIX B

                    MASSACHUSETTS BUSINESS CORPORATION LAW,
                                 SECTIONS 85-98

C. 156B SEC.85.  DISSENTING STOCKHOLDER; RIGHT TO DEMAND PAYMENT FOR STOCK;
EXCEPTION

     A stockholder in any corporation organized under the laws of Massachusetts
which shall have duly voted to consolidate or merge with another corporation or
corporations under the provisions of sections seventy-eight or seventy-nine who
objects to such consolidation or merger may demand payment for his stock from
the resulting or surviving corporation and an appraisal in accordance with the
provisions of sections eighty-six to ninety-eight, inclusive, and such
stockholder and the resulting or surviving corporation shall have the rights and
duties and follow the procedure set forth in those sections. This section shall
not apply to the holders of any shares of stock of a constituent corporation
surviving a merger if, as permitted by subsection (c) of section seventy-eight,
the merger did not require for its approval a vote of the stockholders of the
surviving corporation.

C. 156B SEC.86.  SECTIONS APPLICABLE TO APPRAISAL; PREREQUISITES

     If a corporation proposes to take a corporate action as to which any
section of this chapter provides that a stockholder who objects to such action
shall have the right to demand payment for his shares and an appraisal thereof,
sections eighty-seven to ninety-eight, inclusive, shall apply except as
otherwise specifically provided in any section of this chapter. Except as
provided in sections eighty-two and eighty-three, no stockholder shall have such
right unless (1) he files with the corporation before the taking of the vote of
the shareholders on such corporate action, written objection to the proposed
action stating that he intends to demand payment for his shares if the action is
taken and (2) his shares are not voted in favor of the proposed action.

C. 156B SEC.87.  STATEMENT OF RIGHTS OF OBJECTING STOCKHOLDERS IN NOTICE OF
MEETING; FORM

     The notice of the meeting of stockholders at which the approval of such
proposed action is to be considered shall contain a statement of the rights of
objecting stockholders. The giving of such notice shall not be deemed to create
any rights in any stockholder receiving the same to demand payment for his
stock, and the directors may authorize the inclusion in any such notice of a
statement of opinion by the management as to the existence or non-existence of
the right of the stockholders to demand payment for their stock on account of
the proposed corporate action. The notice may be in such form as the directors
or officers calling the meeting deem advisable, but the following form of notice
shall be sufficient to comply with this section:

     "If the action proposed is approved by the stockholders at the meeting and
effected by the corporation, any stockholder (1) who files with the corporation
before the taking of the vote on the approval of such action, written objection
to the proposed action stating that he intends to demand payment for his shares
if the action is taken and (2) whose shares are not voted in favor of such
action has or may have the right to demand in writing from the corporation (or,
in the case of a consolidation or merger, the name of the resulting or surviving
corporation shall be inserted), within twenty days after the date of mailing to
him of notice in writing that the corporate action has become effective, payment
for his shares and an appraisal of the value thereof. Such corporation and any
such stockholder shall in such cases have the rights and duties and shall follow
the procedure set forth in sections 88 to 98, inclusive, of chapter 156B of the
General Laws of Massachusetts."

C. 156B SEC.88.  NOTICE OF EFFECTIVENESS OF ACTION OBJECTED TO

     The corporation taking such action, or in the case of a merger or
consolidation the surviving or resulting corporation, shall, within ten days
after the date on which such corporate action became effective, notify each
stockholder who filed a written objection meeting the requirements of section
eighty-six and

                                       B-1


whose shares were not voted in favor of the approval of such action, that the
action approved at the meeting of the corporation of which he is a stockholder
has become effective. The giving of such notice shall not be deemed to create
any rights in any stockholder receiving the same to demand payment for his
stock. The notice shall be sent by registered or certified mail, addressed to
the stockholder at his last known address as it appears in the records of the
corporation.

C. 156B SEC.89.  DEMAND FOR PAYMENT; TIME FOR PAYMENT

     If within twenty days after the date of mailing of a notice under
subsection (e) of section eighty-two, subsection (f) of section eighty-three, or
section eighty-eight, any stockholder to whom the corporation was required to
give such notice shall demand in writing from the corporation taking such
action, or in the case of a consolidation or merger from the resulting or
surviving corporation, payment for his stock, the corporation upon which such
demand is made shall pay to him the fair value of his stock within thirty days
after the expiration of the period during which such demand may be made.

C. 156B SEC.90.  DEMAND FOR DETERMINATION OF VALUE; BILL IN EQUITY; VENUE

     If during the period of thirty days provided for in section eighty-nine the
corporation upon which such demand is made and any such objecting stockholder
fail to agree as to the value of such stock, such corporation or any such
stockholder may within four months after the expiration of such thirty-day
period demand a determination of the value of the stock of all such objecting
stockholders by a bill in equity filed in the superior court in the county where
the corporation in which such objecting stockholder held stock had or has its
principal office in the commonwealth.

C. 156B SEC.91.  PARTIES TO SUIT TO DETERMINE VALUE; SERVICE

     If the bill is filed by the corporation, it shall name as parties
respondent all stockholders who have demanded payment for their shares and with
whom the corporation has not reached agreement as to the value thereof. If the
bill is filed by a stockholder, he shall bring the bill in his own behalf and in
behalf of all other stockholders who have demanded payment for their shares and
with whom the corporation has not reached agreement as to the value thereof, and
service of the bill shall be made upon the corporation by subpoena with a copy
of the bill annexed. The corporation shall file with its answer a duly verified
list of all such other stockholders, and such stockholders shall thereupon be
deemed to have been added as parties to the bill. The corporation shall give
notice in such form and returnable on such date as the court shall order to each
stockholder party to the bill by registered or certified mail, addressed to the
last known address of such stockholder as shown in the records of the
corporation, and the court may order such additional notice by publication or
otherwise as it deems advisable. Each stockholder who makes demand as provided
in section eighty-nine shall be deemed to have consented to the provisions of
this section relating to notice, and the giving of notice by the corporation to
any such stockholder in compliance with the order of the court shall be a
sufficient service of process on him. Failure to give notice to any stockholder
making demand shall not invalidate the proceedings as to other stockholders to
whom notice was properly given, and the court may at any time before the entry
of a final decree make supplementary orders of notice.

C. 156B SEC.92.  DECREE DETERMINING VALUE AND ORDERING PAYMENT; VALUATION DATE

     After hearing the court shall enter a decree determining the fair value of
the stock of those stockholders who have become entitled to the valuation of and
payment for their shares, and shall order the corporation to make payment of
such value, together with interest, if any, as hereinafter provided, to the
stockholders entitled thereto upon the transfer by them to the corporation of
the certificates representing such stock if certificated or, if uncertificated,
upon receipt of an instruction transferring such stock to the corporation. For
this purpose, the value of the shares shall be determined as of the day
preceding the date of the vote approving the proposed corporate action and shall
be exclusive of any element of value arising from the expectation or
accomplishment of the proposed corporate action.

                                       B-2


C. 156B SEC.93.  REFERENCE TO SPECIAL MASTER

     The court in its discretion may refer the bill or any question arising
thereunder to a special master to hear the parties, make findings and report the
same to the court, all in accordance with the usual practice in suits in equity
in the superior court.

C. 156B SEC.94.  NOTATION ON STOCK CERTIFICATES OF PENDENCY OF BILL

     On motion the court may order stockholder parties to the bill to submit
their certificates of stock to the corporation for the notation thereon of the
pendency of the bill, and may order the corporation to note such pendency in its
records with respect to any uncertificated shares held by such stockholder
parties, and may on motion dismiss the bill as to any stockholder who fails to
comply with such order.

C. 156B SEC.95.  COSTS; INTEREST

     The costs of the bill, including the reasonable compensation and expenses
of any master appointed by the court, but exclusive of fees of counsel or of
experts retained by any party, shall be determined by the court and taxed upon
the parties to the bill, or any of them, in such manner as appears to be
equitable, except that all costs of giving notice to stockholders as provided in
this chapter shall be paid by the corporation. Interest shall be paid upon any
award from the date of the vote approving the proposed corporate action, and the
court may on application of any interested party determine the amount of
interest to be paid in the case of any stockholder.

C. 156B SEC.96.  DIVIDENDS AND VOTING RIGHTS AFTER DEMAND FOR PAYMENT

     Any stockholder who has demanded payment for his stock as provided in this
chapter shall not thereafter be entitled to notice of any meeting of
stockholders or to vote such stock for any purpose and shall not be entitled to
the payment of dividends or other distribution on the stock (except dividends or
other distributions payable to stockholders of record at a date which is prior
to the date of the vote approving the proposed corporate action) unless:

     (1) A bill shall not be filed within the time provided in section ninety;

     (2) A bill, if filed, shall be dismissed as to such stockholder; or

     (3) Such stockholder shall with the written approval of the corporation, or
in the case of a consolidation or merger, the resulting or surviving
corporation, deliver to it a written withdrawal of his objections to and an
acceptance of such corporate action.

     Notwithstanding the provisions of clauses (1) to (3), inclusive, said
stockholder shall have only the rights of a stockholder who did not so demand
payment for his stock as provided in this chapter.

C. 156B SEC.97.  STATUS OF SHARES PAID FOR

     The shares of the corporation paid for by the corporation pursuant to the
provisions of this chapter shall have the status of treasury stock, or in the
case of a consolidation or merger the shares or the securities of the resulting
or surviving corporation into which the shares of such objecting stockholder
would have been converted had he not objected to such consolidation or merger
shall have the status of treasury stock or securities.

C. 156B SEC.98.  EXCLUSIVE REMEDY; EXCEPTION

     The enforcement by a stockholder of his right to receive payment for his
shares in the manner provided in this chapter shall be an exclusive remedy
except that this chapter shall not exclude the right of such stockholder to
bring or maintain an appropriate proceeding to obtain relief on the ground that
such corporate action will be or is illegal or fraudulent as to him.

                                       B-3


                                                                      APPENDIX C

                                VOTING AGREEMENT

     VOTING AGREEMENT (the "Agreement"), dated as of October 23, 2001, between
          ("Stockholder"), who is a security holder of PRI Automation, Inc., a
Massachusetts corporation ("PRI"), and Brooks Automation, Inc., a Delaware
corporation ("Brooks").

     WHEREAS, concurrently with the execution of this Agreement, PRI, Brooks and
Pontiac Acquisition Corp., a Massachusetts corporation and wholly owned
subsidiary of Brooks ("Merger Sub"), have entered into an Agreement and Plan of
Merger (as the same may be amended from time to time, the "Merger Agreement"),
providing for the merger of Merger Sub with and into PRI, wherein PRI will be
the surviving corporation and become a wholly owned subsidiary of Brooks (the
"Merger") pursuant to the terms and conditions of the Merger Agreement or a
comparable transaction;

     WHEREAS, Stockholder owns of record and beneficially the number of
outstanding shares of capital stock of PRI set forth as "Owned Shares" on
SCHEDULE A and has voting power over such additional number of outstanding
shares of capital stock of PRI, if any, set forth as "Controlled Shares" on
SCHEDULE A (collectively, the Owned Shares and the Controlled Shares are
referred to as the "Shares"), and wishes to enter into this Agreement with
respect to all of such Shares and any additional shares hereafter acquired; and

     WHEREAS, in order to induce Brooks to enter into the Merger Agreement,
Stockholder has agreed, upon the terms and subject to the conditions set forth
herein, to vote the Shares and any additional shares hereafter acquired, and to
grant an irrevocable proxy to Brooks to vote the Shares and any additional
shares hereafter acquired, at every meeting of PRI's stockholders in favor of
approval and adoption of the Merger Agreement, the Merger and all agreements and
actions related to the Merger;

     NOW THEREFORE, for good and valuable consideration, the receipt,
sufficiency and adequacy of which are hereby acknowledged, the parties hereto
agree as follows:

     1. Agreement to Vote Shares.  Stockholder agrees during the term of this
Agreement to vote all the Shares and any other capital stock that Stockholder
becomes entitled to vote, whether through contract, purchase, exercise of an
option or otherwise ("Additional Shares") to approve and adopt the Merger
Agreement, the Merger and all agreements and actions related to the Merger at
every meeting of the stockholders of PRI, and at every adjournment thereof, at
which such Merger Agreement and other related agreements (or any amended version
thereof), or such other related actions, are submitted for the consideration and
vote of the stockholders of PRI. Stockholder hereby agrees that Stockholder will
not vote any Shares or Additional Shares in favor of the approval of any (i) PRI
Takeover Proposal (as defined in the Merger Agreement) by any person other than
Brooks or its affiliates, (ii) reorganization, recapitalization, liquidation or
winding up of PRI or any other extraordinary transaction involving PRI, (iii)
corporate action the consummation of which would frustrate the purposes, or
prevent or delay the consummation, of the transactions contemplated by the
Merger Agreement, or (iv) other matter relating to, or in connection with, any
of the foregoing matters.

     2. Irrevocable Proxy.  Stockholder hereby revokes any and all previous
proxies granted with respect to the Shares and/or any Additional Shares.
Stockholder hereby grants a proxy appointing Brooks as Stockholder's
attorney-in-fact and proxy, with full power of substitution, for and in
Stockholder's name, to vote, express consent or dissent, or otherwise to utilize
such voting power in such manner and upon such matters as Brooks or its proxy or
substitute shall, in Brooks' sole discretion, deem proper with respect to the
Shares and the Additional Shares. Simultaneously with the execution and delivery
of this Agreement, Stockholder is delivering to Brooks a proxy in the form of
Annex A hereto. The proxy granted by Stockholder pursuant to this Section 2 is
irrevocable to the extent permitted by Massachusetts law, is coupled with an
interest and is granted in consideration of Brooks' entering into the Merger
Agreement and incurring certain related fees and expenses, and in consideration
of and reliance upon certain other

                                       C-1


PRI stockholders' entering into agreements substantially similar to this
Agreement. The proxy hereby granted by Stockholder shall terminate in accordance
with Section 9.

     3. Valid Title.  Stockholder is the sole, true, lawful record and
beneficial owner of the Owned Shares, and there are no restrictions on
Stockholder's voting rights with respect thereto or contractual restrictions on
Stockholder's rights of disposition with respect thereto. None of the Owned
Shares is subject to any voting trust or other agreement or arrangement with
respect to the voting of such Owned Shares. Stockholder has the sole right to
vote the shares, if any, listed as Controlled Shares on SCHEDULE A hereto.

     4. Non-Contravention.  Stockholder represents that the execution, delivery
and performance by Stockholder of this Agreement and the consummation by
Stockholder of the transactions contemplated hereby (i) are within Stockholder's
power and have been duly authorized by all necessary action (including any
approval or other action by or with any other person), (ii) require no action by
or in respect of, or filing with, any governmental body, agency, official or
authority (except as may be required under the Hart-Scott-Rodino Antitrust
Improvements Act ("HSR Act") or by Regulation 13D-G under the Securities
Exchange Act of 1934), (iii) do not and will not violate any statute, rule or
regulation applicable to Stockholder (except that the pre-merger notification
requirements of the HSR Act may apply), or any injunction, order or decree
binding on Stockholder, and (iv) will not result in the imposition of any lien
on any Shares or Additional Shares.

     5. Binding.  Stockholder represents that this Agreement has been duly
executed and delivered by Stockholder and is the valid and binding agreement of
Stockholder, enforceable against Stockholder in accordance with its terms,
except (i) as enforcement may be limited by bankruptcy, insolvency, moratorium
or other similar laws relating to creditors' rights generally and (ii) that the
remedy of specific performance and injunctive and other forms of equitable
relief may be subject to equitable defenses and to the discretion of the court
before which any proceeding therefor may be brought. If this Agreement is being
executed in a representative or fiduciary capacity, the person signing this
Agreement has full power and authority to enter into and perform this Agreement.

     6. No Proxies for or Encumbrances on Stockholder's Shares.  Except as
provided in this Agreement, Stockholder agrees that Stockholder shall not,
during the term of this Agreement, without the prior written consent of Brooks,
directly or indirectly, (i) grant any proxies or enter into any voting trust or
other agreement or arrangement with respect to the voting of any Shares or
Additional Shares or (ii) sell, assign, transfer, encumber or otherwise dispose
of, or solicit the sale, assignment, transfer, encumbrance or other disposition
of, or enter into any contract, option or other arrangement or understanding
with respect to the direct or indirect sale, assignment, transfer, encumbrance
or other disposition of, any Shares or Additional Shares; provided, however,
that Stockholder may assign or transfer any Shares or Additional Shares for
estate planning or charitable purposes to any person who shall have executed and
delivered to Brooks prior to such assignment or transfer a voting agreement
substantially identical to this Agreement with respect to any Shares and
Additional Shares to be received by such person in such assignment or transfer.

     Stockholder agrees to notify Brooks promptly and to provide all details
required by Brooks if Stockholder shall be approached or solicited, directly or
indirectly, by any person with respect to any of the foregoing.

     7. Conduct of Stockholders.  Stockholder agrees that Stockholder will not
(i) take, or commit to take, any action that would make any representation and
warranty of Stockholder hereunder inaccurate in any respect as of any time prior
to the termination of this Agreement or (ii) omit, or commit to omit, to take
any reasonable action that is within stockholder's power without undue expense
and that is necessary to prevent any such representation or warranty from being
inaccurate in any respect at any such time.

     8. Specific Performance.  Stockholder acknowledges that it will be
impossible to measure in money the damage to Brooks if Stockholder fails to
comply with the obligations imposed by this Agreement, and that, in the event of
any such failure, Brooks will not have an adequate remedy at law or in damages.

                                       C-2


Accordingly, Stockholder agrees that injunctive relief or other equitable
remedy, in addition to remedies at law or in damages, is the appropriate remedy
for any such failure, and will not oppose the granting of such relief on the
basis that Brooks has an adequate remedy at law or in damages. Stockholder
agrees that Stockholder will not seek, and agrees to waive any requirement for,
the securing or posting of a bond in connection with Brooks' seeking or
obtaining such equitable relief.

     9. Term of Agreement; Termination.  Subject to Section 13(e), the term of
this Agreement shall commence on the date hereof and such term, this Agreement
and the proxy(ies) granted in and pursuant to Section 2 hereof shall terminate
upon the earlier to occur of (i) the Effective Time (as defined in the Merger
Agreement), and (ii) the date on which the Merger Agreement is terminated in and
pursuant to accordance with its terms. Upon such termination, no party shall
have any further obligations or liabilities hereunder; provided, that such
termination shall not relieve any party from liability for any breach of this
Agreement prior to such termination.

     10. Further Assurances.  Except as otherwise provided in the Merger
Agreement, Stockholder will execute and deliver or cause to be executed and
delivered such further documents and instruments and use Stockholder's best
efforts to take such further actions as may be reasonably necessary in order to
consummate the transactions contemplated hereby or to enable Brooks and any
assignee to exercise and enjoy all voting rights of Stockholder with respect to
the Shares and any Additional Shares.

     11. Entire Agreement.  This Agreement supersedes all prior agreements,
written or oral, between the parties hereto with respect to the subject matter
hereof and contains the entire agreement between the parties with respect to the
subject matter hereof. This Agreement may not be amended, supplemented or
modified, and no provisions hereof may be modified or waived, except by an
instrument in writing signed by the parties hereto. No waiver of any provision
hereof by any party shall be deemed a waiver of any other provision hereof by
such party, nor shall any such waiver be deemed a continuing waiver of any
provision hereof by such party.

     12. Notices.  All notices, requests, claims, demands or other
communications hereunder shall be in writing and shall be deemed given when
delivered personally, upon receipt of a transmission confirmation if sent by
facsimile or like transmission (with confirmation) and on the next business day
when sent by Federal Express, Express mail or other reputable overnight courier
service to the parties at the following addresses (or at such other address for
a party as shall be specified by like notice):

     If to Brooks:

         Brooks Automation, Inc.
         15 Elizabeth Drive
         Chelmsford, MA 01824
         Attention: Ellen B. Richstone
         Fax: (978) 262-2511

     With a copy to:

         Brown Rudnick Freed & Gesmer
         One Financial Center
         Boston, MA 02111
         Attention: David H. Murphree, Esq.
         Fax: (617) 856-8201

     If to Stockholder:

         Attention:

         Fax:

                                       C-3


     With a copy to PRI:

         PRI Automation, Inc.
         840 Middlesex Turnpike
         Billerica, MA 01821
         Attention: Mitchell G. Tyson
         Fax: (978) 671-9430

     and a copy to:

         Foley, Hoag & Eliot LLP
         One Post Office Square
         Boston, MA 02109
         Attention: Robert W. Sweet, Jr., Esq.
         Fax: (617) 832-7000

     13.  Miscellaneous.

     (a) This Agreement shall be deemed a contract made under, and for all
purposes shall be construed in accordance with, the laws of The Commonwealth of
Massachusetts, without regard to its principles of conflicts of laws. Each of
the parties hereby: (a) irrevocably submits to the jurisdiction of the Courts of
the Commonwealth of Massachusetts and the federal courts of the United States of
America located in the Commonwealth of Massachusetts solely in respect of the
interpretation and enforcement of the provisions of this Agreement and in
respect of the transactions contemplated hereby; (b) waives, and agrees not to
assert, as a defense in any action, suit or proceeding for the interpretation or
enforcement hereof, that it is not subject to such jurisdiction or that such
action, suit or proceeding may not be brought or is not maintainable in said
courts or that the venue thereof may not be appropriate or that this Agreement
may not be interpreted or enforced in or by such courts; and (c) irrevocably
agrees that all claims with respect to such action, suit or proceeding shall be
heard and determined in such courts. Each party hereto hereby consents to and
grants any such court's jurisdiction over the person of such party and over the
subject matter of such dispute and agrees that mailing of process or other
papers in connection with any such action, suit or proceeding in the manner
provided in Section 12, or in such other manner as may be permitted by law,
shall be valid and sufficient service thereof.

     (b) If any provision of this Agreement or the application of such provision
to any person or circumstances shall be held invalid or unenforceable by a court
of competent jurisdiction, such provision or application shall be unenforceable
only to the extent of such invalidity or unenforceability, and the remainder of
the provisions not held invalid or unenforceable and the application of such
provisions to persons or circumstances other than the party as to which it is
held invalid, and the remainder of this Agreement, shall not be affected.

     (c) This Agreement may be executed in one or more counterparts, each of
which shall be deemed to be an original but all of which together shall
constitute one and the same instrument.

     (d) All Section headings herein are for convenience of reference only and
are not part of this Agreement, and no construction or reference shall be
derived therefrom.

     (e) The obligations of Stockholder set forth in this Agreement shall not be
effective or binding upon Stockholder until after such time as the Merger
Agreement is executed and delivered by PRI, Brooks and Merger Sub, and the
parties agree that there is not and has not been any other agreement,
arrangement or understanding between the parties hereto with respect to the
matters set forth herein.

                            [Signature page follows]

                                       C-4


     IN WITNESS WHEREOF, the parties hereto have executed and delivered this
Agreement as of the date first written above.

                                          BROOKS AUTOMATION, INC.

                                          By:
                                            ------------------------------------
                                              Name:
                                            Title:

                                          --------------------------------------
                                          [Name of Stockholder]

                                       C-5


                                                                         ANNEX A

                                     PROXY

     The undersigned, for consideration received, hereby appoints Brooks
Automation, Inc., a Delaware corporation ("Brooks"), its proxy, with full power
of substitution, to vote all shares of capital stock owned or later acquired by
the undersigned, and all shares that the undersigned is or becomes entitled to
vote pursuant to contract, trust, deed or otherwise, at any meeting of
stockholders of PRI Automation, Inc., a Massachusetts corporation ("PRI"), and
at any adjournment thereof, to be held for the purpose of voting upon a proposal
to approve and adopt the Agreement and Plan of Merger, dated as of October 23,
2001 (the "Merger Agreement"), by and among PRI, Brooks and Pontiac Acquisition
Corp., a Massachusetts corporation ("Merger Sub"), the Merger (as defined in the
Merger Agreement) and all agreements and actions related to the Merger FOR such
proposal and AGAINST any PRI Takeover Proposal (as defined in the Merger
Agreement). This proxy is subject to the terms of the Voting Agreement dated as
of October 23, 2001 between the undersigned and Brooks, a copy of which is
attached hereto (the "Voting Agreement"), is coupled with an interest, revokes
all prior proxies granted by the undersigned with respect to such shares, is
irrevocable and shall terminate and be of no further force or effect
automatically at such time as the Voting Agreement terminates in accordance with
its terms.

Dated: October 23, 2001

                                          --------------------------------------
                                          [Name of Stockholder]

                                       C-6


                                   SCHEDULE A



  NAME AND ADDRESS OF STOCKHOLDER             OWNED SHARES                      CONTROLLED SHARES
  -------------------------------             ------------                      -----------------
                                                                


                                       C-7


                                                                      APPENDIX D

                                VOTING AGREEMENT

     VOTING AGREEMENT (the "Agreement"), dated as of October 23, 2001, between
          ("Stockholder"), who is a security holder of Brooks Automation, Inc.,
a Delaware corporation ("Brooks"), and PRI Automation Inc., a Massachusetts
corporation ("PRI").

     WHEREAS, concurrently with the execution of this Agreement, PRI, Brooks and
Pontiac Acquisition Corp, a Massachusetts corporation and wholly owned
subsidiary of Brooks ("Merger Sub"), have entered into an Agreement and Plan of
Merger (as the same may be amended from time to time, the "Merger Agreement"),
providing for the merger of Merger Sub with and into PRI, wherein PRI will be
the surviving corporation and become a wholly owned subsidiary of Brooks (the
"Merger") pursuant to the terms and conditions of the Merger Agreement or a
comparable transaction;

     WHEREAS, Stockholder owns of record and beneficially the number of
outstanding shares of capital stock of Brooks set forth as "Owned Shares" on
SCHEDULE A and has voting power over such additional number of outstanding
shares of capital stock of Brooks, if any, set forth as "Controlled Shares" on
SCHEDULE A (collectively, the Owned Shares and the Controlled Shares are
referred to as the "Shares"), and wishes to enter into this Agreement with
respect to all of such Shares and any additional shares hereafter acquired; and

     WHEREAS, in order to induce PRI to enter into the Merger Agreement,
Stockholder has agreed, upon the terms and subject to the conditions set forth
herein, to vote the Shares and any additional shares hereafter acquired, and to
grant an irrevocable proxy to PRI to vote the Shares and any additional shares
hereafter acquired, at every meeting of Brooks' stockholders in favor of
approval and adoption of the Merger Agreement, the Merger and all agreements and
actions related to the Merger;

     NOW THEREFORE, for good and valuable consideration, the receipt,
sufficiency and adequacy of which are hereby acknowledged, the parties hereto
agree as follows:

     1. Agreement to Vote Shares.  Stockholder agrees during the term of this
Agreement to vote all the Shares and any other capital stock that Stockholder
becomes entitled to vote, whether through contract, purchase, exercise of an
option or otherwise ("Additional Shares") to approve and adopt the Merger
Agreement, the Merger and all agreements and actions related to the Merger at
every meeting of the stockholders of Brooks, and at every adjournment thereof,
at which such Merger Agreement and other related agreements (or any amended
version thereof), or such other related actions, are submitted for the
consideration and vote of the stockholders of Brooks. Stockholder hereby agrees
that Stockholder will not vote any Shares or Additional Shares in favor of the
approval of any (i) reorganization, recapitalization, liquidation or winding up
of Brooks or any other extraordinary transaction involving Brooks, (ii)
corporate action the consummation of which would frustrate the purposes, or
prevent or delay the consummation, of the transactions contemplated by the
Merger Agreement, or (iii) other matter relating to, or in connection with, any
of the foregoing matters.

     2. Irrevocable Proxy.  Stockholder hereby revokes any and all previous
proxies granted with respect to the Shares and/or any Additional Shares.
Stockholder hereby grants a proxy appointing PRI as Stockholder's
attorney-in-fact and proxy, with full power of substitution, for and in
Stockholder's name, to vote, express consent or dissent, or otherwise to utilize
such voting power in such manner and upon such matters as PRI or its proxy or
substitute shall, in PRI's sole discretion, deem proper with respect to the
Shares and the Additional Shares. Simultaneously with the execution and delivery
of this Agreement, Stockholder is delivering to PRI a proxy in the form of Annex
A hereto. The proxy granted by Stockholder pursuant to this Section 2 is
irrevocable to the extent permitted by Delaware law, is coupled with an interest
and is granted in consideration of PRI's entering into the Merger Agreement and
incurring certain related fees and expenses, and in consideration of and
reliance upon certain other Brooks stockholder's entering into agreements
substantially similar to this Agreement. The proxy hereby granted by Stockholder
shall terminate in accordance with Section 9.

                                       D-1


     3. Valid Title.  Stockholder is the sole, true, lawful record and
beneficial owner of the Owned Shares, and there are no restrictions on
Stockholder's voting rights with respect thereto or contractual restrictions on
Stockholder's rights of disposition with respect thereto. None of the Owned
Shares is subject to any voting trust or other agreement or arrangement with
respect to the voting of such Owned Shares. Stockholder has the sole right to
vote the shares, if any, listed as Controlled Shares on SCHEDULE A hereto.

     4. Non-Contravention.  Stockholder represents that the execution, delivery
and performance by Stockholder of this Agreement and the consummation by
Stockholder of the transactions contemplated hereby (i) are within Stockholder's
power and have been duly authorized by all necessary action (including any
approval or other action by or with any other person), (ii) require no action by
or in respect of, or filing with, any governmental body, agency, official or
authority (except as may be required under the Hart-Scott-Rodino Antitrust
Improvements Act ("HSR Act") or by Regulation 13D-G under the Securities
Exchange Act of 1934), (iii) do not and will not violate any statute, rule or
regulation applicable to Stockholder (except that the pre-merger notification
requirements of the HSR Act may apply), or any injunction, order or decree
binding on Stockholder, and (iv) will not result in the imposition of any lien
on any Shares or Additional Shares.

     5. Binding.  Stockholder represents that this Agreement has been duly
executed and delivered by Stockholder and is the valid and binding agreement of
Stockholder, enforceable against Stockholder in accordance with its terms,
except (i) as such enforceability may be limited by bankruptcy, insolvency,
reorganization or similar laws affecting creditors' rights generally, and (ii)
that the remedy of specific performance and injunctive and other forms of
equitable relief may be subject to equitable defenses and to the discretion of
the court before which any proceeding therefore may be brought. If this
Agreement is being executed in a representative or fiduciary capacity, the
person signing this Agreement has full power and authority to enter into and
perform this Agreement.

     6. No Proxies for or Encumbrances on Stockholder's Shares.  Except as
provided in this Agreement, Stockholder agrees that Stockholder shall not,
during the term of this Agreement, without the prior written consent of PRI,
directly or indirectly, (i) grant any proxies or enter into any voting trust or
other agreement or arrangement with respect to the voting of any Shares or
Additional Shares or (ii) sell, assign, transfer, encumber or otherwise dispose
of, or solicit the sale, assignment, transfer, encumbrance or other disposition
of, or enter into any contract, option or other arrangement or understanding
with respect to the direct or indirect sale, assignment, transfer, encumbrance
or other disposition of, any Shares or Additional Shares; provided, however,
that Stockholder may assign or transfer any Shares or Additional Shares for
estate planning or charitable purposes to any person who shall have executed and
delivered to PRI prior to such assignment or transfer a voting agreement
substantially identical to this Agreement with respect to any Shares and
Additional Shares to be received by such person in such assignment or transfer.

     Stockholder agrees to notify PRI promptly and to provide all details
required by PRI if Stockholder shall be approached or solicited, directly or
indirectly, by any person with respect to any of the foregoing.

     7. Conduct of Stockholders.  Stockholder agrees that Stockholder will not
(i) take, or commit to take, any action that would make any representation and
warranty of Stockholder hereunder inaccurate in any respect as of any time prior
to the termination of this Agreement or (ii) omit, or commit to omit, to take
any reasonable action that is within Stockholder's power without undue expense
and that is necessary to prevent any such representation or warranty from being
inaccurate in any respect at any such time.

     8. Specific Performance.  Stockholder acknowledges that it will be
impossible to measure in money the damage to PRI if Stockholder fails to comply
with the obligations imposed by this Agreement, and that, in the event of any
such failure, PRI will not have an adequate remedy at law or in damages.
Accordingly, Stockholder agrees that injunctive relief or other equitable
remedy, in addition to remedies at law or in damages, is the appropriate remedy
for any such failure, and will not oppose the granting of such relief on the
basis that PRI has an adequate remedy at law or in damages. Stockholder agrees
that Stockholder will not seek, and agrees to waive any requirement for, the
securing or posting of a bond in connection with PRI's seeking or obtaining such
equitable relief.

                                       D-2


     9. Term of Agreement; Termination.  Subject to Section 13(e), the term of
this Agreement shall commence on the date hereof and such term, this Agreement
and the proxy(ies) granted in and pursuant to Section 2 hereof shall terminate
upon the earlier to occur of (i) the Effective Time (as defined in the Merger
Agreement), and (ii) the date on which the Merger Agreement is terminated in
accordance with its terms. Upon such termination, no party shall have any
further obligations or liabilities hereunder; provided, that such termination
shall not relieve any party from liability for any breach of this Agreement
prior to such termination.

     10. Further Assurances.  Except as otherwise provided in the Merger
Agreement, Stockholder will execute and deliver or cause to be executed and
delivered such further documents and instruments and use Stockholder's best
efforts to take such further actions as may be reasonably necessary in order to
consummate the transactions contemplated hereby or to enable PRI and any
assignee to exercise and enjoy all voting rights of Stockholder with respect to
the Shares and any Additional Shares.

     11. Entire Agreement.  This Agreement supersedes all prior agreements,
written or oral, between the parties hereto with respect to the subject matter
hereof and contains the entire agreement between the parties with respect to the
subject matter hereof. This Agreement may not be amended, supplemented or
modified, and no provisions hereof may be modified or waived, except by an
instrument in writing signed by the parties hereto. No waiver of any provision
hereof by any party shall be deemed a waiver of any other provision hereof by
such party, nor shall any such waiver be deemed a continuing waiver of any
provision hereof by such party.

     12. Notices  All notices, requests, claims, demands or other communications
hereunder shall be in writing and shall be deemed given when delivered
personally, upon receipt of a transmission confirmation if sent by facsimile or
like transmission (with confirmation) and on the next business day when sent by
Federal Express, Express mail or other reputable overnight courier service to
the parties at the following addresses (or at such other address for a party as
shall be specified by like notice):

     If to PRI:

         PRI Automation, Inc.
         840 Middlesex Turnpike
         Billerica, MA 01821
         Attention: President
         Fax: (978) 671-9430

     With a copy to:

         Foley, Hoag & Eliot LLP
         One Post Office Square
         Boston, MA 02109
         Attention: Robert W. Sweet, Jr., Esq.
         Fax: (617) 832-7000

     If to Stockholder:
         Attention:
         Fax:

     With a copy to Brooks:

         Brooks Automation, Inc.
         15 Elizabeth Drive
         Chelmsford, MA 01824
         Attention: Ellen B. Richstone
         Fax: (978) 262-2511

                                       D-3


     and a copy to:

         Brown Rudnick Freed & Gesmer
         One Financial Center
         Boston, MA 02111
         Attention: David H. Murphree, Esq.
         Fax: (617) 856-8201

     13. Miscellaneous.

     (a) This Agreement shall be deemed a contract made under, and for all
purposes shall be construed in accordance with, the laws of the State of
Delaware , without regard to its principles of conflicts of laws. Each of the
parties hereby: (a) irrevocably submits to the jurisdiction of the Courts of the
Commonwealth of Massachusetts and the federal courts of the United States of
America located in the Commonwealth of Massachusetts solely in respect of the
interpretation and enforcement of the provisions of this Agreement and in
respect of the transactions contemplated hereby; (b) waives, and agrees not to
assert, as a defense in any action, suit or proceeding for the interpretation or
enforcement hereof, that it is not subject to such jurisdiction or that such
action, suit or proceeding may not be brought or is not maintainable in said
courts or that the venue thereof may not be appropriate or that this Agreement
may not be interpreted or enforced in or by such courts; and (c) irrevocably
agrees that all claims with respect to such action, suit or proceeding shall be
heard and determined in such courts. Each party hereto hereby consents to and
grants any such court's jurisdiction over the person of such party and over the
subject matter of such dispute and agrees that mailing of process or other
papers in connection with any such action, suit or proceeding in the manner
provided in Section 12, or in such other manner as may be permitted by law,
shall be valid and sufficient service thereof.

     (b) If any provision of this Agreement or the application of such provision
to any person or circumstances shall be held invalid or unenforceable by a court
of competent jurisdiction, such provision or application shall be unenforceable
only to the extent of such invalidity or unenforceability, and the remainder of
the provisions not held invalid or unenforceable and the application of such
provisions to persons or circumstances other than the party as to which it is
held invalid, and the remainder of this Agreement, shall not be affected.

     (c) This Agreement may be executed in one or more counterparts, each of
which shall be deemed to be an original but all of which together shall
constitute one and the same instrument.

     (d) All Section headings herein are for convenience of reference only and
are not part of this Agreement, and no construction or reference shall be
derived therefrom.

     (e) The obligations of Stockholder set forth in this Agreement shall not be
effective or binding upon Stockholder until after such time as the Merger
Agreement is executed and delivered by PRI, Brooks and Merger Sub, and the
parties agree that there is not and has not been any other agreement,
arrangement or understanding between the parties hereto with respect to the
matters set forth herein.

                            [Signature page follows]

                                       D-4


     IN WITNESS WHEREOF, the parties hereto have executed and delivered this
Agreement as of the date first written above.

                                          PRI AUTOMATION, INC.

                                          By:
                                            ------------------------------------
                                              Name:
                                              Title:

                                          STOCKHOLDER

                                          --------------------------------------
                                          Name:

                                       D-5


                                                                         ANNEX A

                                     PROXY

     The undersigned, for consideration received, hereby appoints PRI
Automation, Inc., a Massachusetts corporation ("PRI"), its proxy, with full
power of substitution, to vote all shares of capital stock owned or later
acquired by the undersigned, and all shares that the undersigned is or becomes
entitled to vote pursuant to contract, trust, deed or otherwise, at any meeting
of stockholders of Brooks Automation, Inc., a Delaware corporation ("Brooks"),
and at any adjournment thereof, to be held for the purpose of voting upon a
proposal to approve and adopt the Agreement and Plan of Merger, dated as of
October 23, 2001 (the "Merger Agreement"), by and among PRI, Brooks and Pontiac
Acquisition Corp., a Massachusetts corporation ("Merger Sub"), the Merger (as
defined in the Merger Agreement) and all agreements and actions related to the
Merger FOR such proposal. This proxy is subject to the terms of the Voting
Agreement dated as of October 23, 2001 between the undersigned and PRI, a copy
of which is attached hereto (the "Voting Agreement"), is coupled with an
interest, revokes all prior proxies granted by the undersigned with respect to
such shares, is irrevocable and shall terminate and be of no further force or
effect automatically at such time as the Voting Agreement terminates in
accordance with its terms.

Dated: October 23, 2001

                                          STOCKHOLDER

                                          --------------------------------------
                                          Signature

                                       D-6


                                   SCHEDULE A



  NAME AND ADDRESS OF STOCKHOLDER             OWNED SHARES                      CONTROLLED SHARES
  -------------------------------             ------------                      -----------------
                                                                


                                       D-7


                                                                      APPENDIX E

[Credit Suisse/First Boston Logo]
CREDIT SUISSE FIRST BOSTON CORPORATION

650 California Street                                    Telephone  415 249 2100

San Francisco, CA 94108
October 23, 2001

Board of Directors
Brooks Automation, Inc.
15 Elizabeth Drive
Chelmsford, Massachusetts 01824

Members of the Board:

     You have asked us to advise you with respect to the fairness, from a
financial point of view, to Brooks Automation, Inc. ("Brooks") of the Exchange
Ratio (as defined below) set forth in the Agreement and Plan of Merger, dated as
of October 23, 2001 (the "Merger Agreement"), among PRI Automation, Inc.
("PRI"), Brooks and Pontiac Acquisition Corp., a wholly owned subsidiary of
Brooks ("Merger Sub"). The Agreement provides for, among other things, the
merger of Merger Sub with and into PRI (the "Merger") pursuant to which each
outstanding share of the common stock, par value $0.01 per share, of PRI ("PRI
Common Stock") will be converted into the right to receive 0.520 (the "Exchange
Ratio") of a share of the common stock, par value $0.01 per share, of Brooks
("Brooks Common Stock").

     In arriving at our opinion, we have reviewed the Merger Agreement and
certain publicly available business and financial information relating to Brooks
and PRI. We also have reviewed certain other information relating to Brooks and
PRI, including certain publicly available financial forecasts with respect to
Brooks and certain financial forecasts with respect to PRI prepared and provided
to us by PRI, and have met with the managements of Brooks and PRI to discuss the
businesses and prospects of Brooks and PRI. We also have considered certain
financial and stock market data of Brooks and PRI, and we have compared those
data with similar data for publicly held companies in businesses similar to
those of Brooks and PRI, and we have considered, to the extent publicly
available, the financial terms of certain other business combinations and other
transactions which have been effected or announced. We also considered such
other information, financial studies, analyses and investigations and financial,
economic and market criteria which we deemed relevant.

     In connection with our review, we have not assumed any responsibility for
independent verification of any of the foregoing information and have relied on
its being complete and accurate in all material respects. With respect to the
publicly available financial forecasts for Brooks, we have reviewed and
discussed such forecasts with the management of Brooks and have been advised,
and have assumed, that such forecasts represent reasonable estimates as to the
future financial performance of Brooks. We have been advised, and have assumed,
that the financial forecasts for PRI (including adjustments thereto) have been
reasonably prepared on bases reflecting the best currently available estimates
and judgments of the management of PRI as to the future financial performance of
PRI. In addition, we have relied, without independent verification, upon the
assessments of the managements of Brooks and PRI as to (i) the existing and
future technology and products of Brooks and PRI and the risks associated with
such technology and products, (ii) the potential cost savings and synergies
(including the amount, timing and achievability thereof) and strategic benefits
anticipated by the managements of Brooks and PRI to result from the Merger,
(iii) their ability to integrate the businesses of Brooks and PRI and (iv) their
ability to retain key employees of Brooks and PRI. We also have assumed, with
your consent, that the Merger will be consummated upon the terms and subject to
the conditions set forth in the Merger Agreement without

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[Credit Suisse/First Boston Logo]

Board of Directors
Brooks Automation, Inc.
October 23, 2001
Page 2

amendment, modification or waiver of any material terms thereof and that in the
course of obtaining any necessary regulatory and third party approvals and
consents for the Merger, no modification, condition, restriction, limitation or
delay will be imposed that will have a material adverse effect on Brooks or PRI
or the contemplated benefits of the Merger. We also have assumed, with your
consent, that the Merger will be treated as a tax-free reorganization for
federal income tax purposes. We have not been requested to make, and have not
made, an independent evaluation or appraisal of the assets or liabilities
(contingent or otherwise) of Brooks or PRI (including, without limitation, any
potential liabilities arising from litigation pending against PRI), nor have we
been furnished with any such evaluations or appraisals. Our opinion is
necessarily based upon information available to us, and financial, economic,
market and other conditions as they exist and can be evaluated, on the date
hereof. We are not expressing any opinion as to what the value of Brooks Common
Stock actually will be when issued pursuant to the Merger or the prices at which
Brooks Common Stock will trade at any time. Our opinion does not address the
relative merits of the Merger as compared to other business strategies that
might be available to Brooks, nor does it address the underlying business
decision of Brooks to proceed with the Merger.

     We have acted as financial advisor to Brooks in connection with the Merger
and will receive a fee for our services, a significant portion of which is
contingent upon the consummation of the Merger. We also will receive a fee upon
delivery of this opinion. We and our affiliates have in the past provided and
are currently providing investment banking and financial services to Brooks
unrelated to the proposed Merger, for which services we have received and will
receive compensation. An affiliate of Credit Suisse First Boston beneficially
owns shares of Brooks Common Stock and PRI Common Stock. In the ordinary course
of business, we and our affiliates may actively trade the securities of Brooks
and PRI for our own and such affiliates' accounts and for the accounts of
customers and, accordingly, may at any time hold long or short positions in such
securities.

     It is understood that this letter is for the information of the Board of
Directors of Brooks in connection with its evaluation of the Merger and does not
constitute a recommendation to any stockholder as to how such stockholder should
vote or act on any matter relating to the Merger.

     Based upon and subject to the foregoing, it is our opinion that, as of the
date hereof, the Exchange Ratio is fair, from a financial point of view, to
Brooks.

                                      Very truly yours,

                                      CREDIT SUISSE FIRST BOSTON CORPORATION

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                                                                      APPENDIX F

[MORGAN STANLEY LOGO]
                              1585 Broadway
                              New York, NY 10036

                              tel  212 761 4000

                                October 23, 2001

Board of Directors
PRI Automation, Inc.
805 Middlesex Turnpike
Billerica, Massachusetts 01821

Members of the Board:

     We understand that PRI Automation, Inc. ("PRI"), Brooks Automation, Inc.
("Brooks") and Pontiac Acquisition Corp. ("Brooks Merger Sub") propose to enter
into an Agreement and Plan of Merger, substantially in the form of the draft
dated October 21, 2001 (the "Merger Agreement"), which provides, among other
things, for the merger of Brooks Merger Sub with and into PRI (the "Merger").
Pursuant to the Merger, each outstanding share of common stock, par value $0.01
per share, of PRI (the "PRI Common Stock"), other than shares held in treasury
or held by Brooks or any affiliate of Brooks or as to which dissenters' rights
have been perfected, will be converted into the right to receive 0.520 shares
(the "Exchange Ratio") of common stock, par value $0.01 per share, of Brooks
(the "Brooks Common Stock"). The terms and conditions of the Merger are more
fully set forth in the Merger Agreement.

     You have asked for our opinion as to whether the Exchange Ratio pursuant to
the Merger Agreement is fair from a financial point of view to holders of shares
of PRI Common Stock.

     For purposes of the opinion set forth herein, we have:

     (i) reviewed certain publicly available financial statements and other
         information of Brooks and PRI, respectively;

     (ii) discussed certain internal financial statements and other financial
          and operating data concerning Brooks and PRI prepared by the
          management of Brooks and PRI, respectively;

     (iii) discussed certain financial projections of Brooks and PRI prepared by
           the management of Brooks and PRI, respectively;

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[Morgan Stanley Logo]

PRI Automation, Inc.
October 23, 2001
Page 2

       (iv) discussed the past and current operations and financial condition
            and the prospects of Brooks and PRI, including information relating
            to certain strategic, financial and operational benefits anticipated
            from the Merger, with senior executives of Brooks and PRI,
            respectively;

        (v) reviewed the pro forma impact of the Merger on Brooks's earnings per
            share;

       (vi) discussed potential strategic and operational benefits of the Merger
            with senior executives of Brooks and PRI;

      (vii) reviewed the reported prices and trading activity for the PRI Common
            Stock and the Brooks Common Stock;

     (viii) compared the financial performance of PRI and Brooks and the prices
            and trading activity of the PRI Common Stock and the Brooks Common
            Stock with that of certain other comparable publicly traded
            companies and their securities;

       (ix) reviewed the financial terms, to the extent publicly available, of
            certain comparable acquisition transactions;

        (x) participated in discussions and negotiations among representatives
            of Brooks and PRI and their financial and legal advisors;

       (xi) reviewed the Merger Agreement and certain related documents; and

      (xii) considered such other factors and performed such other analyses as
            we have deemed appropriate.

     We have assumed and relied upon without independent verification the
accuracy and completeness of the information reviewed by us for the purposes of
this opinion. With respect to the financial projections, including information
relating to certain strategic, financial and operational benefits anticipated
from the Merger, we have assumed that they have been reasonably prepared on
bases reflecting the best currently available estimates and judgments of the
future financial performance and prospects of Brooks and PRI. We have relied
upon the assessment by the managements of Brooks and PRI of their ability to
retain key employees. We have also relied upon, without independent
verification, the assessment by the management of Brooks' and PRI's technologies
and products, the timing and risks associated with the integration of Brooks and
PRI and the validity of, and risks associated with, Brooks' and PRI's existing
and future products and technologies.

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[Morgan Stanley Logo]

PRI Automation, Inc.
October 23, 2001
Page 3

     In addition, we have assumed that the Merger will be consummated in
accordance with the terms set forth in the Merger Agreement, including, among
other things, that the Merger will be treated as a tax-free reorganization
and/or exchange, each pursuant to the Internal Revenue Code of 1986. We have not
made any independent valuation or appraisal of the assets or liabilities of the
Brooks and PRI, nor have we been furnished with any such appraisals. Our opinion
is necessarily based on financial, economic, market and other conditions as in
effect on, and the information made available to us as of, the date hereof.

     We have been retained to provide financial advisory services to management
and the Board of Directors of PRI in connection with this transaction and will
receive a fee for our services. In the past, Morgan Stanley & Co. Incorporated
and its affiliates have provided financial advisory and financing services for
PRI and have received fees for the rendering of these services.

     It is understood that this letter is for the information of the Board of
Directors of PRI and may not be used for any other purpose without our prior
written consent, except that this opinion may be included in its entirety, if
required, in any filing made by PRI in respect of the transaction with the
Securities and Exchange Commission. In addition, this opinion does not in any
manner address the prices at which the Brooks Common Stock will trade at any
time or following consummation of the Merger, and Morgan Stanley expresses no
opinion or recommendation as to how the shareholders of Brooks and PRI should
vote at the shareholders' meetings held in connection with the Merger.

     Based on and subject to the foregoing, we are of the opinion on the date
hereof that the Exchange Ratio pursuant to the Merger Agreement is fair from a
financial point of view to holders of shares of PRI Common Stock.

                                          Very truly yours,

                                          MORGAN STANLEY & CO. INCORPORATED

                                          /s/ Cordell G. Spencer
                                          Cordell G. Spencer
                                          Managing Director

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                                                                      APPENDIX G

                            CERTIFICATE OF AMENDMENT
                                       OF
                          CERTIFICATE OF INCORPORATION
                                       OF
                            BROOKS AUTOMATION, INC.

     Brooks Automation, Inc., a corporation organized and existing under the
laws of the State of Delaware (the "Corporation"), pursuant to Section 242 of
the Delaware General Corporation Law, DOES HEREBY CERTIFY:

     FIRST:  That, the Board of Directors of the Corporation, by unanimous
written consent dated             , 2001, in accordance with the provisions of
Section 141(f) of the General Corporation Law of the State of Delaware, duly
adopted resolutions setting forth a proposed amendment to the Corporation's
Certificate of Incorporation. The resolution setting forth the proposed
amendment is as follows:

     RESOLVED:  To amend, subject to the approval by the stockholders of the
                Corporation, the Corporation's Certificate of Incorporation to
                increase the number of shares of the Corporation's common stock
                authorized thereunder from 43,000,000 to 100,000,000 and to
                submit the amendment to the Corporation's Certificate of
                Incorporation to the stockholders of the Corporation for their
                consideration, with a recommendation for approval of the
                amendment.

     SECOND:  The foregoing amendment to the Certificate of Incorporation was
duly adopted by the stockholders at a meeting duly held, at which a quorum was
present and acting throughout and in accordance with the provisions of Section
242 of the General Corporation Law of Delaware, on             , 2002.

     THIRD:  That the Certificate of Incorporation be amended by deleting the
first paragraph of Article Fourth in its entirety and replacing it as follows:


          
                "The total number of shares of all classes of stock which
                the Corporation shall have authority to issue is (i)
                100,000,000 shares of Common Stock, $.01 par value per share
                (the "Common Stock"), and (ii) 1,000,000 shares of Preferred
                Stock, $.01 par value per share (the "Preferred Stock")."


                    [REST OF PAGE INTENTIONALLY LEFT BLANK]

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     IN WITNESS WHEREOF, the Corporation has caused this certificate to be
signed by Robert J. Therrien, President, and attested to by Samuel P. Williams,
Assistant Secretary, as of this      day of             , 2002.

                                            BROOKS AUTOMATION, INC.

                                            By:
                                              ----------------------------------
                                                      Robert J. Therrien
                                                          President

ATTEST:

By:
    --------------------------------
           Samuel P. Williams
          Assistant Secretary

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                                                                      1368-PS-02


                                                                     ROBOA-PS-02