COMPUTER ASSOCIATES INTERNATIONAL INC
SC 14D1, 1999-04-02
PREPACKAGED SOFTWARE
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<PAGE>
                       SECURITIES AND EXCHANGE COMMISSION
 
                             WASHINGTON, D.C. 20549
                            ------------------------
 
                                 SCHEDULE 14D-1
 
                   TENDER OFFER STATEMENT PURSUANT TO SECTION
 
                14(D)(1) OF THE SECURITIES EXCHANGE ACT OF 1934
 
                    PLATINUM TECHNOLOGY International, INC.
 
                           (Name of Subject Company)
 
                                HARDMETAL, INC.
                    COMPUTER ASSOCIATES INTERNATIONAL, INC.
 
                                    (Bidder)
 
                    COMMON STOCK, PAR VALUE $.001 PER SHARE
     CLASS II SERIES A JUNIOR PARTICIPATING PREFERRED SHARE PURCHASE RIGHTS
 
                         (Title of Class of Securities)
 
                                  72764 T 101
 
                     (CUSIP Number of Class of Securities)
                            ------------------------
 
                                  SANJAY KUMAR
                                HARDMETAL, INC.
                  C/O COMPUTER ASSOCIATES INTERNATIONAL, INC.
                         ONE COMPUTER ASSOCIATES PLAZA
                         ISLANDIA, NEW YORK 11788-7000
                           TELEPHONE: (516) 342-5224
 
            (Name, Address and Telephone Number of Person Authorized
           to Receive Notices and Communications on Behalf of Bidder)
 
                                   COPIES TO:
                              SCOTT F. SMITH, ESQ.
                           HOWARD, SMITH & LEVIN LLP
                          1330 AVENUE OF THE AMERICAS
                            NEW YORK, NEW YORK 10019
                           TELEPHONE: (212) 841-1000
 
CALCULATION OF FILING FEE
 
<TABLE>
<CAPTION>
                  TRANSACTION VALUATION*                                        AMOUNT OF FILING FEE
<S>                                                          <C>
                      $2,930,926,401                                                  $586,188
</TABLE>
 
*   Estimated for purposes of calculating the amount of filing fee only. The
    amount assumes the purchase of 100,202,612 Shares of common stock, par value
    $.001 per share, including associated Class II Series A Junior Participating
    Preferred Share Purchase Rights (the "Shares") (which represents 101,282,612
    Shares outstanding less 1,080,000 Shares owned by the Bidders), at a price
    per Share of $29.25 in cash.
 
/ / Check box if any part of the fee is offset as provided by Rule 0-11(a)(2)
and identify the filing with which the offsetting fee was previously paid.
Identify the previous filing by registration statement number, or the Form or
Schedule and the date of its filing.
 
Amount Previously Paid: None.
Form or Registration No.: Not applicable.
Filing Party: Not applicable.
Date Filed: Not applicable.
<PAGE>
                                     14D-1
 
CUSIP NO. 72764 T 101
 
- --------------------------------------------------------------------------------
 
1)  Name of Reporting Persons:  HardMetal, Inc.
    S.S. or I.R.S. Identification Nos. of Above Person:  pending
 
- --------------------------------------------------------------------------------
 
2)  Check the Appropriate Box if a Member of a Group (See Instructions).
 
                                                                         (a) / /
 
                                                                         (b) / /
- --------------------------------------------------------------------------------
 
3)  SEC Use Only
 
- --------------------------------------------------------------------------------
 
4)  Sources of Funds (See Instructions).
 
    AF, WC, BK
- --------------------------------------------------------------------------------
 
5)  Check if Disclosure of Legal Proceedings is Required pursuant to Items 2(e)
    or 2(f).
 
                                                                             / /
- --------------------------------------------------------------------------------
 
6)  Citizenship or Place of Organization.
 
    Delaware
- --------------------------------------------------------------------------------
 
7)  Aggregate Amount Beneficially Owned by Each Reporting Person.
 
    11,353,680* **
- --------------------------------------------------------------------------------
 
8)  Check if the Aggregate Amount in Row 7 Excludes Certain Shares.
 
                                                                             / /
- --------------------------------------------------------------------------------
 
9)  Percent of Class Represented by Amount in Row 7.
 
    Approximately 11.21% based on the outstanding shares as of March 29, 1999*
    **
- --------------------------------------------------------------------------------
 
10) Type of Reporting Person (See Instructions).
 
    CO
- --------------------------------------------------------------------------------
<PAGE>
                                     14D-1
 
CUSIP NO. 72764 T 101
 
- --------------------------------------------------------------------------------
 
1)  Name of Reporting Persons:  Computer Associates International, Inc.
    S.S. or I.R.S. Identification Nos. of Above Person:  13-2857434
 
- --------------------------------------------------------------------------------
 
2)  Check the Appropriate Box if a Member of a Group (See Instructions).
 
                                                                         (a) / /
 
                                                                         (b) / /
- --------------------------------------------------------------------------------
 
3)  SEC Use Only
 
- --------------------------------------------------------------------------------
 
4)  Sources of Funds (See Instructions).
 
    AF, WC, BK
- --------------------------------------------------------------------------------
 
5)  Check if Disclosure of Legal Proceedings is Required pursuant to Items 2(e)
    or 2(f).
 
                                                                             / /
- --------------------------------------------------------------------------------
 
6)  Citizenship or Place of Organization.
 
    Delaware
- --------------------------------------------------------------------------------
 
7)  Aggregate Amount Beneficially Owned by Each Reporting Person.
 
    11,353,680* **
- --------------------------------------------------------------------------------
 
8)  Check if the Aggregate Amount in Row 7 Excludes Certain Shares.
 
                                                                             / /
- --------------------------------------------------------------------------------
 
9)  Percent of Class Represented by Amount in Row 7.
 
    Approximately 11.21% based on the outstanding shares as of March 29, 1999*
    **
- --------------------------------------------------------------------------------
 
10) Type of Reporting Person (See Instructions).
 
    CO
- --------------------------------------------------------------------------------
 
- ------------------------
 
    * On March 29, 1999, HardMetal, Inc. ("Merger Subsidiary"), a wholly owned
subsidiary of Computer Associates International, Inc. ("Computer Associates"),
entered into a Stockholder Option Agreement, dated as of March 29, 1999 (the
"Stockholder Option Agreement"), with certain stockholders of the Company (as
hereinafter defined) (collectively, the "Principal Stockholders"), pursuant to
which the Principal Stockholders each granted the Merger Subsidiary an
irrevocable option, subject to certain conditions (the "Option"), to purchase
for a price of $29.25 per share (subject to the adjustments specified therein),
or to cause to be tendered pursuant to the tender offer described in this
Statement (the "Offer"), all the shares of common stock, par value $0.001 per
share (and the associated Rights) (the "Shares"), of PLATINUM TECHNOLOGY
International, inc. (the "Company") owned by them (representing an aggregate of
2,629,555, or approximately 2.6% of the Shares outstanding as of March 29, 1999)
(the "Optioned Shares"), and an additional 7,644,125 shares issuable to certain
of the Principal Stockholders upon exercise of employee stock options. Merger
Subsidiary's option to purchase the Optioned Shares is reflected in Rows 7 and 9
of each of the tables above. Subject to certain conditions, including the
consummation of the Offer, the Option is exercisable by the Merger Subsidiary at
any time or from time to time, from March 29, 1999 until the 30th business day
after the termination of the Merger Agreement in accordance with its terms.
Pursuant to the Stockholder Option Agreement, each Principal Stockholder has
granted a proxy to the Merger Subsidiary as such Principal Stockholder's
attorney-in-fact and proxy, with full power of substitution, to vote or consent
such Principal Stockholder's Optioned Shares in favor of the Merger. Certain of
the Shares and Optioned Shares are, according to one of the Principal
Stockholders, subject to third party rights, and, to such extent, Merger
Subsidiary's rights under the Stockholder Option Agreement are subject and
subordinate, which may limit Merger Subsidiary's right over such Shares and
Optioned Shares, as described. The Stockholder Option Agreement is described
more fully in Section 11 ("Purpose of the Offer; Merger Agreement; Stockholder
Option Agreement; Consulting and Non-Compete Agreements; Appraisal Rights") of
the Offer to Purchase dated April 2, 1999 (the "Offer to Purchase").
 
    ** On January 15, 1999, Computer Associates purchased 1,080,000 Shares in
open market purchases for an aggregate purchase price (excluding brokerage
commissions) of approximately $14,477,184 (or an average purchase price of
approximately $13.4048 per share) in cash. Such purchases are reflected in Rows
7 and 9 of each of the tables above.
<PAGE>
ITEM 1. SECURITY AND SUBJECT COMPANY.
 
    (a) The name of the subject company is PLATINUM TECHNOLOGY International,
INC., a Delaware corporation (the "Company"), and the address of its principal
executive offices is 1815 South Meyers Road, Oakbrook Terrace, Illinois 60181.
 
    (b) This Statement on Schedule 14D-1 relates to the offer by Merger
Subsidiary (defined below) to purchase all outstanding shares of Common Stock,
par value $.001 per share, including associated Class II Series A Junior
Participating Preferred Share Purchase Rights (collectively, the "Shares"), of
the Company at $29.25 per Share, net to the seller in cash, upon the terms and
subject to the conditions set forth in the Offer to Purchase (the "Offer to
Purchase") and in the related Letter of Transmittal, copies of which are
attached hereto as Exhibits (a)(1) and (a)(2) (which, together with any
amendments or supplements thereto, collectively constitute the "Offer"). The
information set forth in the Introduction to the Offer to Purchase (the
"Introduction") is incorporated herein by reference.
 
    (c) The information set forth in Section 6 ("Price Range of Shares;
Dividends") of the Offer to Purchase is incorporated herein by reference.
 
ITEM 2. IDENTITY AND BACKGROUND.
 
    (a)-(d) and (g) This Statement on Schedule 14D-1 is filed by HardMetal, Inc.
("Merger Subsidiary"), a Delaware corporation, and Computer Associates
International, Inc. ("Computer Associates"), a Delaware corporation. Merger
Subsidiary is a wholly-owned subsidiary of Computer Associates. Information
concerning the principal business and the addresses of the principal offices of
Merger Subsidiary and Computer Associates is set forth in Section 8 ("Certain
Information Concerning Merger Subsidiary and Computer Associates") of the Offer
to Purchase, and is incorporated herein by reference. The names, business
addresses, present principal occupations or employments, material occupations,
positions, offices or employment during the last five years and citizenship of
the directors and executive officers of Merger Subsidiary and Computer
Associates are set forth in Schedule I to the Offer to Purchase and are
incorporated herein by reference.
 
    (e) and (f) None of Merger Subsidiary, Computer Associates or, to the best
knowledge of such corporations, any of the persons listed on Schedule I to the
Offer of Purchase, has during the last five years (i) been convicted in a
criminal proceeding (excluding traffic violations or similar misdemeanors) or
(ii) been a party to a civil proceeding of a judicial or administrative body of
competent jurisdiction and as a result of such proceeding was or is subject to a
judgment, decree or final order enjoining future violations of, or prohibiting
activities subject to, Federal or state securities laws or finding any violation
of such laws.
 
ITEM 3. PAST CONTACTS, TRANSACTIONS OR NEGOTIATIONS WITH THE SUBJECT COMPANY.
 
    (a) and (b) The information set forth in (i) the Introduction, Section 10
("Background of the Offer; Past Contacts, Transactions or Negotiations with the
Company"), Section 11 ("Purpose of the Offer; Merger Agreement; Stockholder
Option Agreement; Consulting and Non-Compete Agreements; Appraisal Rights") and
Schedule I to the Offer to Purchase, (ii) the Agreement and Plan of Merger,
dated as of March 29, 1999 (the "Merger Agreement"), among the Company, Computer
Associates and Merger Subsidiary, a copy of which is attached as Exhibit (c)(1)
hereto, (iii) the Stockholder Option Agreement, dated as of March 29, 1999 (the
"Stockholder Option Agreement"), among the Merger Subsidiary and the
stockholders of the Company named therein, a copy of which is attached as
Exhibit (c)(2) hereto, (iv) the Confidentiality Agreement, dated March 24, 1999
(the "Confidentiality Agreement"), between Computer Associates and the Company,
a copy of which is attached as Exhibit (c)(3) hereto, (v) the Consulting and
Non-Compete Agreement, dated as of March 29, 1999 (the "Filipowski Consulting
Agreement"), between the Company and Andrew Filipowski, a copy of which is
attached as Exhibit (c)(4) hereto, (vi) the Consulting and Non-Compete
Agreement, dated as of March 29, 1999 (the "Cullinane Consulting Agreement"),
between the Company and Michael P. Cullinane a copy of which is attached hereto
as
 
                                       5
<PAGE>
Exhibit (c)(5) and (vii) the Consulting and Non-Compete Agreement, dated as of
March 29, 1999 (the "Humenansky Consulting Agreement"), between the Company and
Paul L. Humenansky, respectively, is incorporated herein by reference.
 
ITEM 4. SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION.
 
    (a) and (b) The information set forth in (i) Section 9 ("Source and Amount
of Funds") of the Offer to Purchase and (ii) the Commitment Letter, dated March
30, 1999, from Credit Suisse First Boston to Computer Associates, a copy of
which is attached as Exhibit (b)(1) hereto, is incorporated herein by reference.
 
    (c) Not applicable.
 
ITEM 5. PURPOSE OF THE TENDER OFFER AND PLANS OR PROPOSALS OF THE BIDDER.
 
    (a)-(e) The information set forth in the Introduction and Section 11
("Purpose of the Offer; Merger Agreement; Stockholder Option Agreement;
Consulting and Non-Compete Agreements; Appraisal Rights") of the Offer to
Purchase is incorporated herein by reference.
 
    (f) and (g) The information set forth in Section 12 ("Effect of the Offer on
the Market for the Shares; Stock Quotations, Registration Under the Exchange
Act") of the Offer to Purchase is incorporated herein by reference.
 
ITEM 6. INTEREST IN SECURITIES OF THE SUBJECT COMPANY.
 
    (a) and (b) The information set forth in (i) the Introduction, Section 8
("Certain Information Concerning the Merger Subsidiary and Computer
Associates"), Section 10 ("Background of the Offer; Past Contacts, Transactions
or Negotiations with the Company"), Section 11 ("Purpose of the Offer; Merger
Agreement; Stockholder Option Agreement; Consulting and Non-Compete Agreements;
Appraisal Rights"), Schedule I of the Offer to Purchase, (ii) the Merger
Agreement, and (iii) the Stockholder Option Agreement, respectively, is
incorporated herein by reference.
 
ITEM 7. CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH RESPECT TO
  THE SUBJECT COMPANY'S SECURITIES.
 
    The information set forth in (i) the Introduction, Section 8 ("Certain
Information Concerning Merger Subsidiary and Computer Associates"), Section 10
("Background of the Offer; Past Contacts, Transactions or Negotiations with the
Company") and Section 11 ("Purpose of the Offer; Merger Agreement; Stockholder
Option Agreement; Consulting and Non-Compete Agreements; Appraisal Rights") of
the Offer to Purchase, (ii) the Merger Agreement, (iii) the Stockholder Option
Agreement, (iv) the Confidentiality Agreement, (v) the Filipowski Consulting
Agreement, (vi) the Cullinane Consulting Agreement and (vii) the Humenansky
Consulting Agreement, respectively, is incorporated herein by reference.
 
ITEM 8. PERSONS RETAINED, EMPLOYED OR TO BE COMPENSATED.
 
    The information set forth in Section 17 ("Fees and Expenses") of the Offer
to Purchase is incorporated herein by reference.
 
ITEM 9. FINANCIAL STATEMENTS OF CERTAIN BIDDERS.
 
    The information set forth in Section 8 ("Certain Information Concerning
Merger Subsidiary and Computer Associates") of the Offer to Purchase, and such
information and the consolidated financial statements of Computer Associates in
Computer Associates' Annual Report on Form 10-K for the fiscal year ended March
31, 1998 and Quarterly Report for the nine months ended December 31, 1998,
respectively, are incorporated herein by reference.
 
                                       6
<PAGE>
ITEM 10. ADDITIONAL INFORMATION.
 
    (a) The information set forth in Section 11 ("Purpose of the Offer; Merger
Agreement; Stockholder Option Agreement; Consulting and Non-Compete Agreements;
Appraisal Rights") of the Offer to Purchase is incorporated herein by reference.
 
    (b)-(d) The information set forth in Section 16 ("Certain Legal Matters;
Regulatory Approvals") of the Offer to Purchase is incorporated herein by
reference.
 
    (e) None.
 
    (f) The information set forth in (i) the Offer to Purchase, (ii) the Letter
of Transmittal, (iii) the Merger Agreement, (iv) the Stockholder Option
Agreement, (v) the Confidentiality Agreement, (vi) the Filipowski Consulting
Agreement, (vii) the Cullinane Consulting Agreement and (vii) the Humenansky
Consulting Agreement, respectively, is incorporated herein by reference.
 
ITEM 11. MATERIAL TO BE FILED AS EXHIBITS.
 
<TABLE>
<S>        <C>
(a)(1)     Offer to Purchase dated April 2, 1999.
 
(a)(2)     Form of Letter of Transmittal.
 
(a)(3)     Form of Notice of Guaranteed Delivery.
 
(a)(4)     Form of Letter to Brokers, Dealers, Commercial Banks, Trust Companies and Other
           Nominees.
 
(a)(5)     Form of Letter to Clients for use by Brokers, Dealers, Commercial Banks, Trust
           Companies and Other Nominees.
 
(a)(6)     Text of press release issued by Computer Associates dated March 29, 1999.
 
(a)(7)     Guidelines for Certification of Taxpayer Identification Number on Substitute Form
           W-9.
 
(a)(8)     Form of summary advertisement dated April 2, 1999.
 
(a)(9)     Text of press release issued by Computer Associates dated April 2, 1999.
 
(b)(1)     Amended and Restated Commitment Letter dated March 30, 1999 between Credit Suisse
           First Boston and Computer Associates.
 
(c)(1)     Agreement and Plan of Merger, dated as of March 29, 1999, among the Company,
           Computer Associates and Merger Subsidiary.
 
(c)(2)     Stockholder Option Agreement, dated as of March 29, 1999, among Merger Subsidiary
           and the stockholders of the Company named therein.
 
(c)(3)     Confidentiality Agreement, dated March 24, 1999, between Computer Associates and the
           Company.
 
(c)(4)     Consulting and Non-Compete Agreement, dated as of March 29, 1999, between the
           Company and Andrew Filipowski.
 
(c)(5)     Consulting and Non-Compete Agreement, dated as of March 29, 1999, between the
           Company and Michael P. Cullinane.
 
(c)(6)     Consulting and Non-Compete Agreement, dated as of March 29, 1999, between the
           Company and Paul L. Humenansky.
 
(d)        None.
 
(e)        Not applicable.
 
(f)        None.
</TABLE>
 
                                       7
<PAGE>
                                   SIGNATURE
 
    After due inquiry and to the best of my knowledge and belief, the
undersigned certifies that the information set forth in this statement is true,
complete and correct.
 
Dated: April 2, 1999
 
<TABLE>
<S>                             <C>  <C>
                                HARDMETAL, INC.
 
                                By:  /s/ IRA H. ZAR
                                     -----------------------------------------
                                     Name: Ira H. Zar
                                     Title: President and Assistant Treasurer
 
                                COMPUTER ASSOCIATES INTERNATIONAL, INC.
 
                                By:  /s/ IRA H. ZAR
                                     -----------------------------------------
                                     Name: Ira H. Zar
                                     Title: Senior Vice President-Finance and
                                     Chief Financial Officer
</TABLE>
 
                                       10
<PAGE>
                                 EXHIBIT INDEX
 
<TABLE>
<CAPTION>
 EXHIBIT
 NUMBER                                                  EXHIBIT NAME
- ---------  --------------------------------------------------------------------------------------------------------
<S>        <C>
 
(a)(1)     Offer to Purchase dated April 2, 1999.
 
(a)(2)     Form of Letter of Transmittal.
 
(a)(3)     Form of Notice of Guaranteed Delivery.
 
(a)(4)     Form of Letter to Brokers, Dealers, Commercial Banks, Trust Companies and Other Nominees.
 
(a)(5)     Form of Letter to Clients for use by Brokers, Dealers, Commercial Banks, Trust Companies and Other
           Nominees.
 
(a)(6)     Text of press release issued by Computer Associates dated March 29, 1999.
 
(a)(7)     Guidelines for Certification of Taxpayer Identification Number on Substitute Form W-9.
 
(a)(8)     Form of summary advertisement dated April 2, 1999.
 
(a)(9)     Text of press release issued by Computer Associates dated April 2, 1999.
 
(b)(1)     Amended and Restated Commitment Letter dated March 30, 1999 between Credit Suisse First Boston and
           Computer Associates.
 
(c)(1)     Agreement and Plan of Merger, dated as of March 29, 1999 among the Company, Computer Associates and
           Merger Subsidiary.
 
(c)(2)     Stockholder Option Agreement, dated as of March 29, 1999, among Merger Subsidiary and the stockholders
           of the Company named therein.
 
(c)(3)     Confidentiality Agreement, dated March 24, 1999, between Computer Associates and the Company.
 
(c)(4)     Consulting and Non-Compete Agreement, dated as of March 29, 1999, between the Company and Andrew
           Filipowski.
 
(c)(5)     Consulting and Non-Compete Agreement, dated as of March 29, 1999, between the Company and Michael P.
           Cullinane.
 
(c)(6)     Consulting and Non-Compete Agreement, dated as of March 29, 1999, between the Company and Paul L.
           Humenansky.
 
(d)        None.
 
(e)        Not applicable.
 
(f)        None.
</TABLE>
 
                                       11

<PAGE>

                                                                Exhibit 99(a)(1)


                           OFFER TO PURCHASE FOR CASH
                     ALL OUTSTANDING SHARES OF COMMON STOCK
                        (INCLUDING THE ASSOCIATED RIGHTS)

                                       OF

                     PLATINUM TECHNOLOGY INTERNATIONAL, INC.

                                       AT

                              $29.25 NET PER SHARE

                                       BY

                                 HARDMETAL, INC.
                          A WHOLLY OWNED SUBSIDIARY OF

                    COMPUTER ASSOCIATES INTERNATIONAL, INC.

- --------------------------------------------------------------------------------
     THE OFFER AND WITHDRAWAL RIGHTS EXPIRE AT 12:00 MIDNIGHT, NEW YORK CITY
        TIME, ON THURSDAY, APRIL 29, 1999, UNLESS THE OFFER IS EXTENDED.
- --------------------------------------------------------------------------------

      THE OFFER IS CONDITIONED UPON, AMONG OTHER THINGS, (1) THERE BEING VALIDLY
TENDERED BY THE EXPIRATION DATE AND NOT WITHDRAWN A NUMBER OF SHARES OF COMMON
STOCK, PAR VALUE $.001 PER SHARE (INCLUDING THE ASSOCIATED RIGHTS (AS DEFINED
HEREIN)) (THE "SHARES"), OF PLATINUM technology International, inc. (THE
"COMPANY") WHICH, TOGETHER WITH THE SHARES THEN OWNED BY HardMetal, Inc.
("MERGER SUBSIDIARY") AND COMPUTER ASSOCIATES INTERNATIONAL, INC. ("COMPUTER
ASSOCIATES"), WOULD REPRESENT AT LEAST A MAJORITY OF THE TOTAL NUMBER OF
OUTSTANDING SHARES ON A FULLY DILUTED BASIS AND (2) THE EXPIRATION OR
TERMINATION OF THE APPLICABLE WAITING PERIOD UNDER THE HART-SCOTT-RODINO
ANTITRUST IMPROVEMENTS ACT OF 1976.

      THE BOARD OF DIRECTORS OF THE COMPANY HAS UNANIMOUSLY DETERMINED THAT THE
OFFER AND THE TRANSACTIONS CONTEMPLATED BY THE MERGER AGREEMENT ARE FAIR TO, AND
IN THE BEST INTERESTS OF, THE STOCKHOLDERS OF THE COMPANY, HAS UNANIMOUSLY
APPROVED THE OFFER AND THE TRANSACTIONS CONTEMPLATED BY THE MERGER AGREEMENT,
AND UNANIMOUSLY RECOMMENDS THAT THE STOCKHOLDERS OF THE COMPANY ACCEPT THE OFFER
AND TENDER THEIR SHARES.

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

      Any stockholder desiring to tender Shares should either (i) complete and
sign the Letter of Transmittal (or a facsimile thereof) in accordance with the
instructions in the Letter of Transmittal and deliver it with the certificate(s)
representing such tendered Shares and all other required documents to the
Depositary or follow the procedure for book-entry tender of Shares set forth in
Section 3 or (ii) request such stockholder's broker, dealer, commercial bank,
trust company or other nominee to effect the transaction for such stockholder. A
stockholder having Shares registered in the name of a broker, dealer, commercial
bank, trust company or other nominee must contact such person if such
stockholder desires to tender such Shares. Any stockholder who desires to tender
Shares and whose certificate(s) representing such Shares are not immediately
available, or who cannot comply with the procedure for book-entry transfer on a
timely basis, may tender such Shares pursuant to the guaranteed delivery
procedure set forth in Section 3.

      Questions and requests for assistance or additional copies of this Offer
to Purchase or the Letter of Transmittal may be directed to the Information
Agent at its addresses and telephone numbers specified on the back cover of this
Offer to Purchase.

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

                     THE INFORMATION AGENT FOR THE OFFER IS:

                            MACKENZIE PARTNERS, INC.

APRIL 2, 1999


<PAGE>

                               TABLE OF CONTENTS

<TABLE>
<CAPTION>

                                                                                     Page
                                                                                     ----
<S>                                                                                   <C>
INTRODUCTION                                                                            1

1.      Terms of the Offer                                                              3

2.      Acceptance for Payment and Payment                                              5

3.      Procedure for Tendering Shares                                                  6

4.      Withdrawal Rights                                                               9
 
5.      Certain Tax Consequences                                                       10

6.      Price Range of Shares; Dividends                                               11

7.      Certain Information Concerning the Company                                     11

8.      Certain Information Concerning Merger Subsidiary and Computer
        Associates                                                                     13

9.      Source and Amount of Funds                                                     15

10.     Background of the Offer; Past Contacts, Transactions or Negotiations 
        with the Company                                                               18

11.     Purpose of the Offer; Merger Agreement; Stockholder Option Agreement; 
        Consulting and Non-Compete Agreements; Appraisal Rights                        19

12.     Effect of the Offer on the Market for the Shares; Stock Quotations;
        Registration under the Exchange Act                                            35

13.     Dividends and Distributions                                                    36

14.     Extension of Tender Period; Termination; Amendment                             37

15.     Certain Conditions of the Offer                                                38

16.     Certain Legal Matters; Regulatory Approvals                                    41

17.     Fees and Expenses                                                              44

18.     Miscellaneous                                                                  44


Schedule I   Information Concerning the Directors and Executive Officers
             of Computer Associates and Merger Subsidiary                             I-1

</TABLE>


<PAGE>

To the Holders of Common Stock of 
PLATINUM TECHNOLOGY International, INC.:

                                  INTRODUCTION

         HardMetal, Inc., a Delaware corporation ("Merger Subsidiary") and a
wholly owned subsidiary of Computer Associates International, Inc., a Delaware
corporation ("Computer Associates"), hereby offers to purchase all outstanding
shares of Common Stock, par value $.001 per share (including the associated
Rights (as defined below)) (collectively, except where the context otherwise
requires, the "Shares"), of PLATINUM TECHNOLOGY International, INC., a Delaware
corporation (the "Company"), at $29.25 per Share, net to the seller in cash,
upon the terms and subject to the conditions set forth in this Offer to Purchase
and in the related Letter of Transmittal (which, together with any amendments or
supplements hereto or thereto, collectively constitute the "Offer"). Tendering
stockholders of the Company (the stockholders of the Company are referred to
herein as the "Stockholders") will not be obligated to pay brokerage fees or
commissions or, except as set forth in the Letter of Transmittal, transfer taxes
on the purchase of Shares pursuant to the Offer. Computer Associates will pay
all charges and expenses of American Stock Transfer & Trust Company (the
"Depositary") and MacKenzie Partners, Inc. (the "Information Agent") in
connection with the Offer.

         THE BOARD OF DIRECTORS OF THE COMPANY HAS UNANIMOUSLY DETERMINED THAT
THE OFFER AND THE TRANSACTIONS CONTEMPLATED BY THE MERGER AGREEMENT (DEFINED
BELOW) ARE FAIR TO, AND IN THE BEST INTERESTS OF, THE STOCKHOLDERS, HAS
UNANIMOUSLY APPROVED THE OFFER AND THE TRANSACTIONS CONTEMPLATED BY THE MERGER
AGREEMENT, AND UNANIMOUSLY RECOMMENDS THAT THE STOCKHOLDERS ACCEPT THE OFFER AND
TENDER THEIR SHARES.

         PURSUANT TO THE MERGER AGREEMENT, THE COMPANY HAS REPRESENTED TO
COMPUTER ASSOCIATES THAT CREDIT SUISSE FIRST BOSTON CORPORATION ("FINANCIAL
ADVISOR"), THE COMPANY'S FINANCIAL ADVISOR, HAS DELIVERED TO THE COMPANY'S BOARD
OF DIRECTORS ITS OPINION TO THE EFFECT THAT THE $29.25 PER SHARE TO BE PAID IN
THE OFFER AND THE MERGER IS FAIR TO THE HOLDERS OF THE SHARES FROM A FINANCIAL
POINT OF VIEW. THE OPINION OF THE FINANCIAL ADVISOR IS TO BE SET FORTH IN FULL
IN THE COMPANY'S SOLICITATION/RECOMMENDATION STATEMENT ON SCHEDULE 14D-9 (THE
"SCHEDULE 14D-9"), TO BE FILED BY THE COMPANY AND MAILED TO STOCKHOLDERS IF NOT
MAILED HEREWITH. STOCKHOLDERS ARE URGED TO READ THIS OPINION IN ITS ENTIRETY.

         THE OFFER IS CONDITIONED UPON, AMONG OTHER THINGS, (1) THERE BEING
VALIDLY TENDERED BY THE EXPIRATION DATE (DEFINED BELOW) AND NOT WITHDRAWN A
NUMBER OF SHARES WHICH, TOGETHER WITH THE SHARES THEN OWNED BY COMPUTER
ASSOCIATES AND MERGER SUBSIDIARY, WOULD REPRESENT AT LEAST A MAJORITY OF THE
TOTAL NUMBER OF OUTSTANDING SHARES, ASSUMING THE EXERCISE OF ALL OUTSTANDING
OPTIONS, RIGHTS AND CONVERTIBLE SECURITIES (IF ANY) AND THE ISSUANCE OF ALL
SHARES THAT THE COMPANY IS OBLIGATED TO ISSUE (SUCH TOTAL NUMBER OF OUTSTANDING
SHARES BEING HEREINAFTER REFERRED TO AS THE "FULLY DILUTED SHARES") (THE
"MINIMUM CONDITION") AND (2) THE EXPIRATION OR TERMINATION OF THE APPLICABLE
WAITING PERIOD UNDER THE HART-SCOTT-RODINO ANTITRUST IMPROVEMENTS ACT OF 1976
(THE "HSR ACT"). SEE SECTION 15, WHICH SETS FORTH IN FULL THE CONDITIONS TO THE
OFFER.


<PAGE>

         The Company has represented to Computer Associates that, as of March
29, 1999, there were (i) 101,282,612 Shares issued and outstanding, (ii)
28,442,209 Shares reserved for issuance upon the exercise of stock options
outstanding under various employee and director stock option plans, (iii)
1,768,421 Shares reserved for issuance upon conversion of the outstanding Class
II Series B Preferred Stock (the "Series B Preferred Stock"), and (iv)
12,401,032 Shares reserved for issuance upon conversion of the Company's 6 3/4%
Convertible Subordinated Notes due 2001 and 6.25% Convertible Subordinated Notes
due 2002 (collectively with the Series B Preferred Stock, the "Convertible
Securities"). Based upon the foregoing, as of March 29, 1999, there were
approximately 143,894,274 Fully Diluted Shares. Fully Diluted Shares includes
Shares issuable upon conversion of convertible securities and exercise of
options issued by the Company that are not expected by Merger Subsidiary to be
converted or exercised in connection with the Offer. Computer Associates
beneficially owns up to 11,353,680 Shares representing (based upon the
foregoing) up to approximately 7.89% of the Fully Diluted Shares. Of such
Shares, Computer Associates directly owns 1,080,000 Shares. Accordingly,
Computer Associates believes that the Minimum Condition would be satisfied
(based on the foregoing assumptions) if approximately 70,867,138 Shares (in
addition to the Shares referred to in the immediately preceding sentence), or
approximately 49.25% of the Fully Diluted Shares, are validly tendered pursuant
to the Offer and not withdrawn. Merger Subsidiary has the right to direct the
tender of up to 10,273,680 Shares pursuant to an agreement with certain
Stockholders, as more specifically described in Section 11.

         The Offer is being made pursuant to an Agreement and Plan of Merger,
dated as of March 29, 1999 (the "Merger Agreement"), among the Company, Computer
Associates and Merger Subsidiary, which has been unanimously approved by the
Company's Board of Directors. The Merger Agreement provides, among other things,
that, after consummation of the Offer, and after satisfaction or waiver of all
conditions to the Merger, Merger Subsidiary will be merged into the Company (the
"Merger"), with the Company continuing as the surviving corporation (the
"Surviving Corporation"). Pursuant to the Merger Agreement, at the effective
time of the Merger (the "Effective Time"), each outstanding Share (other than
Shares owned by Computer Associates, Merger Subsidiary or any subsidiary of
either of them or held by the Company as treasury stock (which shall be
canceled) or by Stockholders exercising appraisal rights under Delaware Law
(defined below)) and each outstanding share of the Series B Preferred Stock will
be converted into the right to receive $29.25 in cash or any higher price paid
for each Share in the Offer, without interest. If the Minimum Condition is
satisfied and Merger Subsidiary purchases Shares pursuant to the Offer, Merger
Subsidiary will have the power to approve the Merger without the affirmative
vote of any other Stockholder. In the event that Merger Subsidiary owns 90% or
more of the Shares then outstanding, the "short-form" merger provisions of the
Delaware General Corporation Act ("Delaware Law") would permit the Merger to
occur without a meeting or a vote of the Stockholders. See Section 11.

         Merger Subsidiary and certain Stockholders have entered into an
Agreement, dated as of March 29, 1999 (the "Stockholder Option Agreement"),
pursuant to which such Stockholders granted to Merger Subsidiary an irrevocable
option (the "Stock Option") to purchase, subject to certain conditions and
certain prior rights of third parties, for a price of $29.25 per Share, or to
cause to be tendered pursuant to the Offer, an aggregate of up to 2,629,555
Shares (the "Stockholder Option Shares") and up to an additional 7,644,125
Shares issuable under outstanding employee stock 

<PAGE>

options. The Stockholder Option Shares represent approximately 1.83% of the
Fully Diluted Shares. Subject to satisfaction of certain conditions (including
the commencement of the Offer), the Stockholder Option is exercisable by Merger
Subsidiary at any time until the 30th business day following termination of the
Merger Agreement, subject in part to such prior third party rights. Under the
Stockholder Option Agreement, each such Stockholder granted an irrevocable proxy
to Merger Subsidiary to vote in favor of the Merger Agreement and certain
related matters, subject as aforesaid.

         At or immediately prior to the Effective Time, each outstanding stock
option under the Company's various employee and director stock option plans
which are vested or which pursuant to the terms of the relevant stock option
plan become vested by virtue of the Offer or the Merger will be canceled and the
holder of such option will receive cash based on the Offer price promptly after
the Effective Time. See Section 11. All such outstanding stock options that at
the time of the Merger are not vested shall, by virtue of the Merger, be assumed
by Computer Associates. See Section 11.

         In connection with the execution of the Merger Agreement, the Company
amended the Rights Agreement, dated as of December 21, 1995, between the Company
and Harris Trust and Savings Bank, as Rights Agent, to make it and the Class II
Series A Junior Participating Preferred Shares issued thereunder (the "Rights")
inapplicable to the Offer and the Merger. See Section 11.

         Upon acceptance for payment by Merger Subsidiary of such number of
Shares which satisfies the Minimum Condition, Computer Associates is entitled,
pursuant to the Merger Agreement, to designate the number of directors, rounded
up to the next whole number, on the Company's Board of Directors that equals the
product of (i) the total number of directors on the Company's Board of Directors
and (ii) the percentage that the number of Shares owned by Computer Associates
or Merger Subsidiary (including Shares accepted for payment) bears to the total
number of Shares outstanding, and the Company shall take all necessary action to
cause Computer Associates' designees to be elected or appointed to the Company's
Board of Directors; PROVIDED that, prior to the Effective Time, the Company's
Board of Directors shall always have two members who are neither designees nor
affiliates of Computer Associates or Merger Subsidiary nor employees of the
Company (each, an "Independent Director"). No action proposed to be taken by the
Company to amend or terminate the Merger Agreement or waive any action by
Computer Associates or Merger Subsidiary shall be effective without the approval
of both Independent Directors.

         THIS OFFER TO PURCHASE AND THE RELATED LETTER OF TRANSMITTAL CONTAIN
IMPORTANT INFORMATION WHICH SHOULD BE READ BEFORE ANY DECISION IS MADE WITH
RESPECT TO THE OFFER.

1.   TERMS OF THE OFFER.

         Upon the terms and subject to the conditions set forth in the Offer,
Merger Subsidiary will accept for payment and purchase, at the time and in the
manner set forth in Section 2, all Shares that are validly tendered by the
Expiration Date and not withdrawn as provided in Section 4. Unless and until
certificates representing Rights ("Rights Certificates") are issued, a tender of
Shares pursuant to the Offer will constitute a tender of associated Rights
evidenced by the certificates for such Shares. 


<PAGE>

The term "Expiration Date" shall mean 12:00 Midnight, New York City time, on
Thursday, April 29, 1999, unless Merger Subsidiary shall have extended the
period of time for which the Offer is open, in which event the term "Expiration
Date" shall mean the latest time and date at which the Offer, as so extended by
Merger Subsidiary, shall expire.

         The Offer is subject to certain conditions set forth in Section 15,
including satisfaction of the Minimum Condition and expiration or termination of
the waiting period applicable to Merger Subsidiary's acquisition of Shares
pursuant to the Offer under the HSR Act. If any such condition is not satisfied,
Merger Subsidiary may, except as otherwise described below, (i) terminate the
Offer and return all tendered Shares to tendering Stockholders, (ii) extend the
Offer and, subject to withdrawal rights as set forth in Section 4, retain all
such Shares until the expiration of the Offer as so extended, (iii) waive such
condition (except the Minimum Condition) and, subject to any requirement to
extend the period of time during which the Offer is open, purchase all Shares
validly tendered by the Expiration Date and not withdrawn or (iv) delay
acceptance for payment or payment for Shares, subject to applicable law, until
satisfaction or waiver of the conditions to the Offer. For a description of
Merger Subsidiary's right (or, in certain circumstances, obligation) to extend
the period of time during which the Offer is open and to amend, delay or
terminate the Offer, see Section 14. Merger Subsidiary acknowledges that Rule
14e-1(c) under the Securities Exchange Act of 1934, as amended (the "Exchange
Act"), requires Merger Subsidiary to pay the consideration offered or return the
Shares tendered promptly after the termination or withdrawal of the Offer.

         Pursuant to the Merger Agreement, Computer Associates and Merger
Subsidiary expressly reserve the right to waive any of the conditions to the
Offer and to make any change in the terms or conditions of the Offer; PROVIDED
that, without the written consent of the Company, no change may be made which
changes the form of consideration to be paid in the Offer, decreases the price
per Share or the number of Shares being sought in the Offer, imposes conditions
to the Offer in addition to those expressly set forth in the Merger Agreement,
changes or waives the Minimum Condition, extends the Offer (except as set forth
in the Merger Agreement) or makes any other change to any condition to the Offer
set forth in the Merger Agreement which is adverse to the holders of Shares.

         Any extension, delay in payment, amendment or termination of the Offer
will be followed as promptly as practicable by public announcement thereof, such
announcement in the case of an extension to be made no later than 9:00 a.m., New
York City time, on the next business day after the previously scheduled
Expiration Date. Without limiting the manner in which Merger Subsidiary may
choose to make any public announcement, subject to applicable law (including
Rules 14d-4(c), 14d-6(d) and 14e-1 under the Exchange Act which require that
material changes be promptly disseminated to stockholders in a manner reasonably
designed to inform them of such changes), Merger Subsidiary shall have no
obligation (except as otherwise required by applicable law) to advertise
publicly or otherwise communicate any such public announcement other than by
issuing a release to the Dow Jones News Service.

         Subject to the Merger Agreement, if Merger Subsidiary makes any
material change in the terms of the Offer or the information concerning the
Offer, or waives any condition to the Offer that results in a material change to
the circumstances of the Offer, Merger Subsidiary will disseminate additional
tender offer materials and extend the Offer to the extent required to comply
with Rules 14d-4(c), 14d-6(d) and 14e-1 under the Exchange Act. The Securities
and Exchange Commission 

<PAGE>

(the "Commission") has interpreted such rules to prescribe that the minimum
period during which an offer must remain open following material changes in the
terms of the offer or information concerning the offer, other than a change in
price or a change in percentage of securities sought, will depend upon the facts
and circumstances, including the relative materiality of the terms or
information changed. With respect to a change in price or a change in the
percentage of securities sought, a minimum period of ten business days may be
required to allow for adequate dissemination to stockholders and investor
response. As used in this Offer to Purchase, "business day" means any day other
than a Saturday, Sunday or a federal holiday and shall consist of the time
period from 12:01 a.m. through 12:00 midnight, New York City time.

         The Company has provided Merger Subsidiary with the Company's
stockholder lists and security position listings for the purpose of
disseminating the Offer to holders of Shares. This Offer to Purchase and the
related Letter of Transmittal will be mailed to record holders of Shares and
will be furnished to brokers, banks and similar persons whose names, or the
names of whose nominees, appear on the stockholder list or, if applicable, who
are listed as participants in a clearing agency's security position listing for
subsequent transmittal to beneficial owners of Shares.

2.   ACCEPTANCE FOR PAYMENT AND PAYMENT.

         Subject to the terms of the Offer and the satisfaction (or waiver to
the extent permitted by the Merger Agreement) of all the conditions to the
Offer, Merger Subsidiary shall accept for payment all Shares validly tendered
and not withdrawn pursuant to the Offer as soon as practicable after the
expiration of the Offer and shall pay for all such Shares promptly after
acceptance; provided that Merger Subsidiary may extend the Offer if, at the
scheduled expiration date of the Offer or any extension thereof, any of the
conditions to the Offer shall not have been satisfied, until such time as such
conditions are satisfied or waived, and Merger Subsidiary may extend the Offer
for a further period of time of not more than 20 business days to meet the
objective (which is not a condition to the Offer) that there shall be validly
tendered prior to the Expiration Date (as so extended) and not withdrawn a
number of Shares, which, together with Shares then owned by Computer Associates
and Merger Subsidiary, represents at least 90% of the Fully Diluted Shares. In
addition, under certain circumstances, Merger Subsidiary may be required under
the Merger Agreement to extend the Offer. See Section 11. For a description of
Merger Subsidiary's right to terminate the Offer (subject to the terms of the
Merger Agreement) and not accept for payment or pay for Shares or to delay
acceptance for payment or payment for Shares, see Section 14.

         For purposes of the Offer, Merger Subsidiary shall be deemed to have
accepted for payment tendered Shares when, as and if Merger Subsidiary gives
oral or written notice to the Depositary of its acceptance of the tenders of
such Shares. In all cases, upon the terms and subject to the conditions of the
Offer, payment for Shares accepted for payment pursuant to the Offer will be
made by deposit of the purchase price with the Depositary, which will act as
agent for the tendering Stockholders for the purpose of receiving payments from
Merger Subsidiary and transmitting such payments to tendering Stockholders.

         In all cases, payment for Shares accepted for payment pursuant to the
Offer will be made only after timely receipt by the Depositary of (i)
certificates for such Shares (or of a confirmation of a book-entry transfer (a
"Book-Entry Confirmation") of such Shares into the Depositary's account at


<PAGE>

the Book-Entry Transfer Facility (defined in Section 3)), (ii) a properly
completed and duly executed Letter of Transmittal (or facsimile thereof) or an
Agent's Message (defined below) in connection with a book-entry transfer and
(iii) any other required documents. Accordingly, payment may be made to
tendering Stockholders at different times if delivery of the Shares and other
required documents occur at different times. For a description of the procedure
for tendering Shares pursuant to the Offer, see Section 3. Under no
circumstances will interest be paid by Merger Subsidiary on the consideration
paid for Shares pursuant to the Offer, regardless of any delay in making such
payment.

         The term "Agent's Message" means a message, transmitted by the
Book-Entry Transfer Facility to, and received by, the Depositary and forming a
part of a Book-Entry Confirmation, which states that the Book-Entry Transfer
Facility has received an express acknowledgment from the participant in the
Book-Entry Transfer Facility tendering the Shares which are the subject of such
Book-Entry Confirmation, that such participant has received and agrees to be
bound by the terms of the Letter of Transmittal and that Merger Subsidiary may
enforce such agreement against such participant.

         If Merger Subsidiary increases the consideration to be paid for Shares
pursuant to the Offer, Merger Subsidiary will pay such increased consideration
for all Shares purchased pursuant to the Offer.

         Merger Subsidiary reserves the right to transfer or assign, in whole or
from time to time in part, to one or more of Computer Associates or any of its
wholly owned subsidiaries, the right to purchase Shares tendered pursuant to the
Offer, but any such transfer or assignment will not relieve Merger Subsidiary of
its obligations under the Offer or prejudice the rights of tendering
Stockholders to receive payment for Shares validly tendered and accepted for
payment pursuant to the Offer.

         If any tendered Shares are not purchased pursuant to the Offer for any
reason, or if certificates are submitted for more Shares than are tendered,
certificates for such unpurchased or untendered Shares will be returned (or, in
the case of Shares tendered by book-entry transfer, such Shares will be credited
to an account maintained at the Book-Entry Transfer Facility), without expense
to the tendering Stockholder, as promptly as practicable following the
expiration or termination of the Offer.

3.   PROCEDURE FOR TENDERING SHARES.

         To tender Shares pursuant to the Offer, either (i) a properly completed
and duly executed Letter of Transmittal (or facsimile thereof), or an Agent's
Message in connection with a book-entry transfer of such Shares, and any other
documents required by the Letter of Transmittal must be received by the
Depositary at one of its addresses set forth on the back cover of this Offer to
Purchase and either (a) certificates for such Shares to be tendered must be
received by the Depositary at one of such addresses or (b) such Shares must be
delivered pursuant to the procedures for book-entry transfer described below
(and a Book-Entry Confirmation received by the Depositary), in each case by the
Expiration Date, or (ii) the guaranteed delivery procedure described below must
be complied with.


<PAGE>

         The Depositary will establish an account with respect to the Shares at
The Depository Trust Company (the "Book-Entry Transfer Facility") for purposes
of the Offer within two business days after the date of this Offer to Purchase,
and any financial institution that is a participant in the system of the
Book-Entry Transfer Facility may make delivery of Shares by causing the
Book-Entry Transfer Facility to transfer such Shares into the Depositary's
account in accordance with the procedures of the Book-Entry Transfer Facility.
However, although delivery of Shares may be effected through book-entry
transfer, the Letter of Transmittal (or facsimile thereof), or an Agent's
Message in connection with such book-entry transfer, and any other required
documents must, in any case, be received by the Depositary at one of its
addresses set forth on the back cover of this Offer to Purchase by the
Expiration Date, or the guaranteed delivery procedure described below must be
complied with. Delivery of the Letter of Transmittal and any other required
documents to the Book-Entry Transfer Facility does not constitute delivery to
the Depositary.

         Except as otherwise provided below, all signatures on a Letter of
Transmittal must be guaranteed by a bank, broker, dealer, credit union, savings
association or other entity that is a member of a recognized Medallion Program
approved by The Securities Transfer Association, Inc. (an "Eligible
Institution"). Signatures on a Letter of Transmittal need not be guaranteed (i)
if the Letter of Transmittal is signed by the registered holder of the Shares
tendered therewith and such holder has not completed the box entitled "Special
Payment Instructions" or the box entitled "Special Delivery Instructions" on the
Letter of Transmittal or (ii) if such Shares are tendered for the account of an
Eligible Institution. See Instructions 1 and 5 of the Letter of Transmittal.

         If the certificates representing Shares are registered in the name of a
person other than the signer of the Letter of Transmittal, or if payment is to
be made to, or certificates for unpurchased Shares are to be issued or returned
to, a person other than the registered holder, then the tendered certificates
must be endorsed or accompanied by appropriate stock powers, signed exactly as
the name or names of the registered holder or holders appear on the
certificates, with the signatures on the certificates or stock powers guaranteed
by an Eligible Institution as provided in the Letter of Transmittal.
See Instructions 1 and 5 of the Letter of Transmittal.

         If the certificates representing Shares are forwarded separately to the
Depositary, a properly completed and duly executed Letter of Transmittal (or
facsimile thereof) must accompany each such delivery.

         If a Stockholder desires to tender Shares pursuant to the Offer and
cannot deliver such Shares and all other required documents to the Depositary by
the Expiration Date, or such Stockholder cannot complete the procedure for
delivery by book-entry transfer on a timely basis, such Shares may nevertheless
be tendered if all of the following conditions are met:

               (i) such tender is made by or through an Eligible Institution;

               (ii) a properly completed and duly executed Notice of Guaranteed
         Delivery, substantially in the form provided by Merger Subsidiary, is
         received by the Depositary (as provided below) by the Expiration Date;
         and

               (iii) the certificates for all physically delivered Shares (or a
         Book-Entry

<PAGE>

         Confirmation of all Shares delivered electronically), as well as a
         properly completed and duly executed Letter of Transmittal (or
         facsimile thereof) (or, in the case of a book-entry transfer, an
         Agent's Message) and any other documents required by the Letter of
         Transmittal, are received by the Depositary within three National
         Association of Securities Dealers Inc. trading days on the Nasdaq
         National Market System ("Nasdaq National Market") after the date of
         execution of the Notice of Guaranteed Delivery.

The Notice of Guaranteed Delivery may be delivered by hand or transmitted by
facsimile transmission or mail to the Depositary and must include a guarantee by
an Eligible Institution in the form set forth in such Notice.

         THE METHOD OF DELIVERY OF SHARES AND ALL OTHER REQUIRED DOCUMENTS,
INCLUDING DELIVERY THROUGH THE BOOK-ENTRY TRANSFER FACILITY, IS AT THE OPTION
AND RISK OF THE TENDERING STOCKHOLDER, AND THE DELIVERY WILL BE DEEMED MADE ONLY
WHEN ACTUALLY RECEIVED BY THE DEPOSITARY. IF CERTIFICATES FOR SHARES ARE SENT BY
MAIL, REGISTERED MAIL WITH RETURN RECEIPT REQUESTED, PROPERLY INSURED, IS
RECOMMENDED. IN ALL CASES, SUFFICIENT TIME SHOULD BE ALLOWED TO ENSURE TIMELY
DELIVERY.

         In all cases, payment for Shares tendered and accepted for payment
pursuant to the Offer will be made only after timely receipt by the Depositary
of the certificates for such Shares, or a Book-Entry Confirmation of the
delivery of such Shares, and the Letter of Transmittal (or a facsimile thereof),
properly completed and duly executed, with any required signature guarantees
(or, in the case of a book-entry transfer, an Agent's Message), and any other
documents required by the Letter of Transmittal.

         Under the federal income tax laws, the Depositary will be required to
withhold 31% of the amount of any payments made to certain Stockholders pursuant
to the Offer. In order to avoid such backup withholding, each tendering
Stockholder must provide the Depositary with such Stockholder's correct taxpayer
identification number and certify that such Stockholder is not subject to such
backup withholding by completing the Substitute Form W-9 included in the Letter
of Transmittal.

         By executing a Letter of Transmittal, a tendering Stockholder
irrevocably appoints designees of Merger Subsidiary as such Stockholder's
proxies in the manner set forth in the Letter of Transmittal to the full extent
of such Stockholder's rights with respect to the Shares tendered by such
Stockholder and accepted for payment by Merger Subsidiary (and any and all other
Shares or other securities issued or issuable in respect of such Shares on or
after March 29, 1999). All such proxies shall be considered coupled with an
interest in the tendered Shares. Such appointment is effective only upon the
acceptance for payment of such Shares by Merger Subsidiary. Upon such acceptance
for payment, all prior proxies and consents granted by such Stockholder with
respect to such Shares and other securities will, without further action, be
revoked, and no subsequent proxies may be given nor subsequent written consents
executed by such Stockholder (and, if given or executed, will not be deemed to
be effective). Such designees of Merger Subsidiary will be empowered to exercise
all voting and other rights of such Stockholder as they, in their sole
discretion, may deem proper at any annual, special or adjourned meeting of the
Company's stockholders, by written consent or otherwise. Merger Subsidiary
reserves the right to require that, in order for Shares to be validly 

<PAGE>

tendered, immediately upon Merger Subsidiary's acceptance for payment of such
Shares, Merger Subsidiary is able to exercise full voting rights with respect to
such Shares and other securities (including voting at any meeting of
stockholders then scheduled or acting by written consent without a meeting).

         All questions as to the form of documents and the validity, eligibility
(including time of receipt) and acceptance for payment of any tender of Shares
will be determined by Merger Subsidiary, in its sole discretion, which
determination shall be final and binding on all parties. Merger Subsidiary
reserves the absolute right to reject any or all tenders of Shares determined by
it not to be in proper form or the acceptance for payment of or payment for
which may, in the opinion of Merger Subsidiary's counsel, be unlawful. Merger
Subsidiary also reserves the absolute right to waive any defect or irregularity
in any tender of Shares, whether or not similar defects or irregularities are
waived in the case of any other tender of Shares. None of Merger Subsidiary,
Computer Associates, the Depositary, the Information Agent or any other person
will be under any duty to give notification of any defect or irregularity in
tenders or incur any liability for failure to give any such notification. Merger
Subsidiary's interpretation of the terms and conditions of the Offer (including
the Letter of Transmittal and the instructions thereto) will be final and
binding.

         The acceptance for payment of Shares tendered pursuant to any one of
the procedures described above will constitute an agreement between the
tendering Stockholder and Merger Subsidiary upon the terms and subject to the
conditions of the Offer.

4.   WITHDRAWAL RIGHTS.

         Tenders of Shares made pursuant to the Offer may be withdrawn at any
time prior to the Expiration Date. Thereafter, such tenders are irrevocable,
except that they may be withdrawn on or after May 31, 1999 unless theretofore
accepted for payment as provided in this Offer to Purchase. If Merger Subsidiary
extends the period of time during which the Offer is open, is delayed in
accepting for payment or paying for Shares or is unable to accept for payment or
pay for Shares pursuant to the Offer for any reason, then, without prejudice to
Merger Subsidiary's rights under the Offer, the Depositary may, on behalf of
Merger Subsidiary, retain all Shares tendered, and such Shares may not be
withdrawn except as otherwise provided in this Section 4.

         For a withdrawal to be effective, a written or facsimile transmission
notice of withdrawal must be timely received by the Depositary at one of its
addresses set forth on the back cover of this Offer to Purchase and must specify
the name of the person who tendered the Shares to be withdrawn and the number of
Shares to be withdrawn. If the Shares to be withdrawn have been delivered to the
Depositary, a signed notice of withdrawal with (except in the case of Shares
tendered by an Eligible Institution) signatures guaranteed by an Eligible
Institution must be submitted prior to the release of such Shares. In addition,
such notice must specify, in the case of Shares tendered by delivery of
certificates, the name of the registered holder (if different from that of the
tendering Stockholder) and the serial numbers shown on the particular
certificates evidencing the Shares to be withdrawn or, in the case of Shares
tendered by book-entry transfer, the name and number of the account at the
Book-Entry Transfer Facility to be credited with the withdrawn Shares.
Withdrawals may not be rescinded, and Shares withdrawn will thereafter be deemed
not validly tendered for purposes of the Offer. However, withdrawn Shares may be
retendered by again following one of the procedures 

<PAGE>

described in Section 3 at any time prior to the Expiration Date.

         All questions as to the form and validity (including time of receipt)
of any notice of withdrawal will be determined by Merger Subsidiary, in its sole
discretion, which determination shall be final and binding. None of Merger
Subsidiary, Computer Associates, the Depositary, the Information Agent or any
other person will be under any duty to give notification of any defect or
irregularity in any notice of withdrawal or incur any liability for failure to
give any such notification.

5.   CERTAIN TAX CONSEQUENCES.

         This summary sets forth material anticipated Federal income tax
consequences to Stockholders of their disposition of Shares pursuant to the
Offer and the Merger. The summary is based on the provisions of the Internal
Revenue Code of 1986, as amended (the "Code"), the Treasury regulations
promulgated thereunder, and administrative and judicial interpretations thereof,
all as currently in effect. Such laws or interpretations may differ on the date
of the consummation of the Offer or at the Effective Time, and relevant facts
may also differ. The summary does not address any foreign, state or local tax
consequences, nor does it address estate or gift tax considerations. Neither the
consummation of the Offer nor the effectiveness of the Merger is conditioned
upon the receipt of any ruling from the Internal Revenue Service or any opinion
of counsel as to tax matters.

         This summary is for general information only. The tax treatment of each
Stockholder will depend in part upon his particular situation. Special tax
consequences not described below may be applicable to particular classes of
taxpayers, including financial institutions, pension funds, mutual funds,
broker-dealers, persons who are not citizens or residents of the United States
or who are foreign corporations, foreign partnerships or foreign estates or
trusts, Stockholders who own actually or constructively (under certain
attribution rules contained in the Code) 5% or more of the Shares, Stockholders
who acquired their Shares through the exercise of an employee stock option or
otherwise as compensation, and persons who receive payments in respect of
options to acquire Shares. ALL STOCKHOLDERS SHOULD CONSULT WITH THEIR OWN TAX
ADVISERS AS TO THE PARTICULAR TAX CONSEQUENCES OF THE OFFER AND THE MERGER TO
THEM, INCLUDING THE APPLICABILITY AND EFFECT OF ANY STATE, LOCAL AND FOREIGN TAX
LAWS.

         Sales of Shares by Stockholders pursuant to the Offer (or the Merger)
will be taxable transactions for Federal income tax purposes and may also be
taxable transactions under applicable state, local, foreign and other tax laws.

         In general, a Stockholder will recognize gain or loss equal to the
difference between the tax basis of such Stockholder's Shares and the amount of
cash received in exchange for the Shares. This gain or loss will be capital gain
or loss if the Shares are capital assets in the hands of the Stockholder and
will be long-term capital gain or loss if the holding period for the Shares is
more than 12 months as of the date of the sale of such Shares.

6.   PRICE RANGE OF SHARES; DIVIDENDS.

         The shares are traded on the Nasdaq National Market under the symbol
"PLAT". The following table sets forth, on a per share basis for the periods
shown, the range of high and low sales 

<PAGE>

prices of the Shares as set forth in the Company 10-K (as defined below) for the
years ended December 31, 1997 and 1998 and as reported by IDD Information
Services for other quotations.

<TABLE>
<CAPTION>

                                     HIGH           LOW
<S>                               <C>           <C>
YEAR ENDING DECEMBER 31, 1999:

First Quarter                      $ 25 1/2      $ 9 9/16

YEAR ENDED DECEMBER 31, 1998:

First Quarter                        31 1/8        22 1/8
Second Quarter                       28 11/16      22 3/8
Third Quarter                        34 5/16       16
Fourth Quarter                       22 1/8        9

YEAR ENDED DECEMBER 31, 1997:

First Quarter                        17 7/8        10 7/8
Second Quarter                       14 13/16      10 1/2
Third Quarter                        25            12 5/8
Fourth Quarter                       30 13/16      20 1/8

</TABLE>

         On March 26, 1999, the last day of trading prior to the issuance by
Computer Associates of a press release announcing the execution of the Merger
Agreement, the last sale price on the Nasdaq National Market was $9 7/8 per
Share. On April 1, 1999, the last day of trading prior to the commencement of
the Offer, the last sale price on the Nasdaq National Market was $25-21/32 per
Share. STOCKHOLDERS ARE URGED TO OBTAIN CURRENT MARKET QUOTATIONS FOR THE
SHARES.

         As reported by the Company, the Company has never declared any cash
dividends or distributions on its capital stock. As of March 23, 1999, according
to the Company's Annual Report on Form 10-K for its fiscal year ended December
31, 1998 (the "Company 10-K"), there were approximately 1,457 holders of record
of outstanding Shares.

7.   CERTAIN INFORMATION CONCERNING THE COMPANY.

         The Company is a Delaware corporation with its principal executive
offices located at 1815 South Meyers Road, Oakbrook Terrace, Illinois 60181.

         According to the Company 10-K, the Company develops, markets and
supports software products, and provides related professional services, that
help organizations manage and improve their information technology
infrastructures, which consists of all the data, systems and applications that
are used to run businesses.

         The following selected consolidated financial data relating to the
Company and its subsidiaries has been taken or derived from the audited
financial statements contained in the 

<PAGE>

Company 10-K. More comprehensive financial information is included in the
Company 10-K and the other documents filed by the Company with the Commission,
and the financial data set forth below is qualified in its entirety by reference
to such reports and other documents including the financial statements (and any
related notes) contained therein. Such reports and other documents may be
examined and copies may be obtained from the offices of the Commission in the
manner set forth below.

                     PLATINUM TECHNOLOGY INTERNATIONAL, INC.
                      SELECTED CONSOLIDATED FINANCIAL DATA
                      (In thousands, except per share data)

<TABLE>
<CAPTION>

                                                       FISCAL YEAR ENDED
STATEMENT OF OPERATIONS DATA                             DECEMBER 31,
                                        -------------------------------------------------
                                           1998              1997              1996
<S>                                    <C>               <C>               <C>
Total revenues                          $ 968,206         $ 738,880         $ 553,484
Operating income (loss)                    20,317 (1)      (102,141)(2)      (101,609)(3)
Net loss from continuing operations        (2,468)(1)      (105,103)(2)       (83,782)(3)
Net loss from continuing operations
   per share--Basic                     $   (0.03)(1)     $   (1.35)(2)     $   (1.16)(3)
Shares used in per share
   calculation--Basic                      83,856            78,072            71,919

<CAPTION>

BALANCE SHEET DATA                                             AT DECEMBER 31,   
                                                          -----------------------
                                                             1998          1997  
<S>                                                      <C>            <C>
Cash, cash equivalents and                                                       
   investments                                            $  302,072     $358,204
Working capital                                              327,945      352,663
Total assets                                               1,150,270      972,907
Long-term obligations and                                                        
   acquisition-related payables, less                                            
   current portion                                           272,810      285,559
Total stockholders' equity                                $  419,813     $342,876

</TABLE>

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

(1)  Reflects a pre-tax charge for acquired in-process technology of $37,918,000
     relating to the Company's acquisitions of certain software businesses and
     product technologies; a pre-tax charge for merger costs of $40,065,000
     relating to certain acquisitions; a restructuring benefit of $10,964,000
     relating to the Company's recovery of certain restructuring charges
     recorded in the second quarter of 1997; and a pre-tax special general and
     administrative charge of $10,982,000 relating to the Company's integration
     procedures related to past acquisition history.

(2)  Reflects a pre-tax charge for acquired in-process technology of $67,904,000
     relating to the Company's acquisitions of certain software businesses and
     product technologies; a pre-tax charge for merger costs of $8,927,000
     relating to certain acquisitions; a pre-tax charge of $55,829,000 for
     restructuring costs; and a pre-tax special general and administrative
     charge of $13,513,000 relating to the Company's integration procedures
     related to past acquisition history.

(3)  Reflects a pre-tax charge for acquired in-process technology of $49,451,000
     relating to the Company's acquisitions of certain software businesses and
     product technologies; a pre-tax charge for merger costs of $5,782,000
     relating to certain acquisitions; a pre-tax charge of $16,312,000 relating
     to Learmonth and Burchett Management Systems Plc and Logic Works, Inc.
     ("Logic Works") restructuring costs; and a pre-tax


<PAGE>

     special general and administrative charge of $1,978,000 related to Logic
     Works.

         The information concerning the Company contained herein has been taken
from or is based upon reports and other documents on file with the Commission or
otherwise publicly available. Although Computer Associates and Merger Subsidiary
do not have any knowledge that would indicate that any statements contained
herein based upon such reports and documents are untrue, Computer Associates and
Merger Subsidiary do not take any responsibility for the accuracy or
completeness of the information contained in such reports and other documents or
for any failure by the Company to disclose events that may have occurred and may
affect the significance or accuracy of any such information but that are unknown
to Computer Associates or Merger Subsidiary.

         The Company is subject to the informational requirements of the
Exchange Act and files periodic reports, proxy statements and other information
with the Commission relating to its business, financial condition and other
matters. The Company is required to disclose in such proxy statements certain
information, as of particular dates, concerning the Company's directors and
officers, their remuneration, stock options granted to them, the principal
holders of the Company's securities and any material interest of such persons in
transactions with the Company. Such reports, proxy statements and other
information may be inspected at the public reference facilities maintained by
the Commission at Judiciary Plaza, 450 Fifth Street, N.W., Washington, D.C.
20549 and should also be available for inspection and copying at the regional
offices of the Commission in New York (Seven World Trade Center, New York, New
York 10048) and Chicago (500 West Madison Street (Suite 1400), Chicago, Illinois
60661). Copies of such material can also be obtained from the Public Reference
Section of the Commission in Washington, D.C. 20549, at prescribed rates. The
Commission maintains a Web site on the Internet that contains reports, proxy
statements and other information (http://www.sec.gov).

8.   CERTAIN INFORMATION CONCERNING MERGER SUBSIDIARY AND COMPUTER ASSOCIATES.

         Merger Subsidiary, a Delaware corporation and a wholly owned subsidiary
of Computer Associates, was organized to acquire the Company and has not
conducted any unrelated activities since its organization on March 25, 1999.

         Computer Associates, a Delaware corporation, supplies an extensive
array of enterprise management software products (which enable customers to use
their total data processing resources more efficiently), information management
software products (which are generally used in connection with database
management systems and applications generators) and business application
software products (which are used in financial, human resource, manufacturing,
distribution and banking systems applications) for use on a variety of hardware
platforms.

         The principal executive offices of Computer Associates and Merger
Subsidiary are located at One Computer Associates Plaza, Islandia, New York
11788-7000. The name, business address, principal occupation or employment and
citizenship of each director and executive officer of Merger Subsidiary and
Computer Associates are set forth in Schedule I hereto.

         The following selected consolidated financial data relating to Computer
Associates and its subsidiaries has been taken or derived from the audited
financial statements contained in Computer 

<PAGE>

Associates' Annual Report on Form 10-K for the year ended March 31, 1998, and
the unaudited financial statements contained in Computer Associates' Quarterly
Report on Form 10-Q for the nine months ended December 31, 1998. The information
set forth below gives effect to the acquisition of Legent Corporation in fiscal
1996. More comprehensive financial information is included in such Annual
Report, such Quarterly Report and the other documents filed by Computer
Associates with the Commission, and the financial data set forth below is
qualified in its entirety by reference to such reports and other documents
including the financial statements (and any related notes) contained therein.
Such reports and other documents may be examined and copies may be obtained from
the offices of the Commission in the same manner as set forth with respect to
the Company in Section 7.

<TABLE>
<CAPTION>

                                 COMPUTER ASSOCIATES INTERNATIONAL, INC.
                                  SELECTED CONSOLIDATED FINANCIAL DATA
                                  (In millions, except per share data)
INCOME STATEMENT DATA                       FISCAL YEAR ENDED            NINE MONTHS ENDED
                                                MARCH 31,                   DECEMBER 31,
                                                                            (UNAUDITED)
                                       1998       1997        1996        1998       1997
<S>                                  <C>        <C>        <C>          <C>        <C>
Total revenue                         $4,719     $4,040     $ 3,505      $3,624     $3,252
Income (loss) before income taxes      1,874        932        (100)        277      1,228
Net income (loss)                      1,169        366         (56)        168        767
Net income (loss) per common          $ 2.06     $ 0.64     $ (0.10)     $ 0.30     $ 1.36
     share-diluted(1)
Dividends declared per common         $ 0.07     $ 0.07     $  0.06      $ 0.08     $ 0.07
     share(1)

<CAPTION>

BALANCE SHEET DATA                        AT MARCH 31,                   AT DECEMBER 31, 1998
                                        1998       1997                      (UNAUDITED)
<S>                                  <C>        <C>                           <C>
Working capital                       $  379     $   53                        $  892
Total assets                           6,706      6,084                         7,278
Long-term debt (less   current         1,027      1,663                         2,030
maturities)
Stockholders' equity                   2,481      1,503                         2,558

</TABLE>

- --------------------
(1)  Adjusted to reflect three-for-two stock splits effective June 19, 1996 and
     November 5, 1997.

         Computer Associates is subject to the informational requirements of the
Exchange Act and files periodic reports, proxy statements and other information
with the Commission relating to its business, financial condition and other
matters. Computer Associates is required to disclose in such proxy statements
certain information, as of particular dates, concerning its directors and
officers, their remuneration, stock options granted to them, the principal
holders of its securities and any material interests of such persons in
transactions with Computer Associates. Such reports, proxy statements and other
information should be available for inspection and copying at the offices of the
Commission in the same manner as set forth with respect to the Company in
Section 7.

<PAGE>

         Except as described in this Offer to Purchase, neither Computer
Associates, Merger Subsidiary nor, to their knowledge, any of the persons listed
in Schedule I or any associate or majority-owned subsidiary of any of the
foregoing, beneficially owns or has the right to acquire any equity securities
of the Company, nor has Computer Associates, Merger Subsidiary or, to their
knowledge, any of the persons or entities referred to above or any of the
respective executive officers, directors or subsidiaries of any of the
foregoing, effected any transaction in the equity securities of the Company
during the past 60 days.

         Except as described in this Offer to Purchase, neither Computer
Associates, Merger Subsidiary nor, to their knowledge, any of the persons listed
in Schedule I, has any contract, arrangement, understanding or relationship with
any other person with respect to any securities of the Company, including, but
not limited to, any contract, arrangement, understanding or relationship
concerning the transfer or the voting of any securities of the Company, joint
ventures, loan or option arrangements, puts or calls, guaranties of loans,
guaranties against loss or the giving or withholding of proxies.

         Except as described in this Offer to Purchase, there have been no
contacts, negotiations or transactions between Computer Associates, Merger
Subsidiary or any other subsidiary of Computer Associates or, to their
knowledge, any of the persons listed in Schedule I, on the one hand, and the
Company or its affiliates, on the other hand, concerning a merger, consolidation
or acquisition, a tender offer or other acquisition of securities, an election
of directors, or a sale or other transfer of a material amount of assets.

         Except as described in this Offer to Purchase, none of Computer
Associates, Merger Subsidiary, any other subsidiary of Computer Associates, or,
to their knowledge, any of the persons listed in Schedule I, has had any
business relationship or transaction with the Company or any of its executive
officers, directors or affiliates that would require disclosure pursuant to the
rules and regulations of the Commission.

9.   SOURCE AND AMOUNT OF FUNDS.

         The total amount of funds required by Merger Subsidiary to purchase
Shares pursuant to the Offer and the Merger, refinance certain indebtedness of
the Company and its subsidiaries, and pay related fees and expenses is expected
to be approximately $3.7 billion. Merger Subsidiary will obtain all funds needed
for the Offer and the Merger from Computer Associates by means of a capital
contribution, loan or a combination thereof, and Computer Associates will, in
turn, obtain such funds (i) from its general corporate funds and (ii) by
borrowing under the credit facilities described below. Merger Subsidiary has not
conditioned the Offer on obtaining financing.

         Computer Associates received a commitment letter dated March 27, 1999
from Credit Suisse First Boston ("CSFB"), which was amended and restated on
March 30, 1999 (as so amended and restated the "Commitment Letter"), pursuant to
which CSFB has committed to provide, on specified terms and subject to specified
conditions, up to $4.5 billion in senior credit facilities (the "Credit
Facilities") to Computer Associates. Although CSFB has committed to provide all
of the Credit Facilities, CSFB expects to act as agent (the "Administrative
Agent") for a syndicate of commercial banks and financial institutions, which,
together with CSFB, will provide the Credit Facilities.

<PAGE>

         The Commitment Letter contemplates three credit facilities: (i) a four
year senior term loan facility in the amount of $2.0 billion (the "Term Loan
Facility"), (ii) a four year senior revolving credit facility in the amount of
$1.0 billion (the "Four Year Revolving Credit Facility") and (iii) a 364-day
senior revolving credit facility in the amount of $1.5 billion (the "364-Day
Revolving Credit Facility"). The Term Loan Facility, the Four Year Revolving
Credit Facility and the 364-Day Revolving Credit Facility, together, comprise
the Credit Facilities. The proceeds of the Credit Facilities may be used (i) to
finance the consideration to be paid in connection with the Offer (or, as the
case may be, to finance amounts to be deposited in the Escrow Account described
in Section 11 under the description of the Merger Agreement) and the Merger,
(ii) to refinance certain outstanding indebtedness of Computer Associates and
its subsidiaries including, after giving effect to the consummation of the Offer
and the Merger (together, the "Transaction"), the Company and its subsidiaries,
(iii) to pay fees and expenses relating thereto, and (iv) in the case of the
Four Year Revolving Credit Facility and the 364-Day Revolving Credit Facility,
for working capital and other general corporate purposes.

         The Term Loan Facility will be available in two drawings, each of which
will be repayable in installments, with the final installment being repayable on
the date which is four years after the date upon which the definitive
documentation with respect to the Credit Facilities becomes effective (the
"Effective Date"). The Four Year Revolving Credit Facility will be available on
a revolving basis throughout a four year term commencing on the Effective Date
and ending on the fourth anniversary thereof and the 364-Day Revolving Credit
Facility will be available on a revolving basis throughout a 364-day term
commencing on the Effective Date and ending on the date which is 364 days
thereafter. The loans under the Credit Facilities shall bear interest (at
Computer Associates' option) at (i) specified margins (adjusted based on the
ratings of Computer Associates' senior unsecured long-term debt) over the London
interbank offered rate (adjusted for reserves) (the "Eurodollar Rate") or (ii)
the higher of (x) the CSFB base lending rate and (y) the federal funds rate plus
a margin of 0.50% (the "Base Rate"). Initially, the margins for the Eurodollar
Rate Loans will be 0.80%, in the case of Eurodollar Rate loans under the Term
Loan Facility and the Four Year Revolving Credit Facility, and 0.85% in the case
of Eurodollar Rate loans under the 364-Day Revolving Credit Facility.

         CSFB's commitments to provide the Credit Facilities is subject to
satisfaction of certain customary conditions, including (a) absence of any
material change in or material disruption of financial, banking or capital
market conditions that, in the judgment of CSFB, could materially impair the
syndication of the Credit Facilities, (b) absence of any material adverse
condition or material adverse change in or affecting the business, operations,
property or condition (financial or otherwise) of Computer Associates and its
subsidiaries taken as a whole or of Computer Associates, the Company and their
subsidiaries taken as a whole, (c) the appropriate markets being clear of
certain competing transactions, and (d) the negotiation, execution and delivery
on or before June 30, 1999 of definitive documentation with respect to the
Credit Facilities satisfactory to CSFB and its counsel, and, in the case of the
Term Loan Facility, the occurrence of the initial borrowing thereunder of the
amount required to finance the offer (or to fund the Escrow Account) on or
before the date which is 270 days after such execution and delivery.

         In addition, the Commitment Letter provides that advances under the
Credit Facilities to fund payments to be made under the Offer or amounts to be
deposited in the Escrow Account 

<PAGE>

pending consummation of the Offer, as the case may be, will be conditioned upon,
among other things, (i) the Merger Agreement not having been amended, waived or
otherwise modified in any respect materially adverse to the interests of the
lenders, without the consent of the Administrative Agent, (ii) the Rights or any
other "poison pill" rights of the Company having been redeemed by the Board of
Directors of the Company or the lenders being satisfied that the Rights have
been invalidated or otherwise not triggered, and (iii) the Board of Directors of
the Company not having withdrawn its approval of the Offer and its
recommendation to the Stockholders of the Company that they accept the Offer. It
is a further condition precedent that, after giving effect to the consummation
of the Offer, Computer Associates shall own and control that number of Shares as
shall be necessary to permit Computer Associates to approve the Merger without
the affirmative vote or approval of any other shareholders.

         The definitive documentation with respect to the Credit Facilities also
will contain representations, warranties, covenants (including a covenant that
the Merger occur within 180 days of the consummation of the Offer), events of
default and conditions customary for credit facilities of this size and type.
Computer Associates has agreed to pay certain fees to CSFB with respect to the
Commitment Letter and to CSFB and the other lenders with respect to the Credit
Facilities. Computer Associates also has agreed to reimburse certain expenses
of, and provide customary indemnities (under certain conditions) to, CSFB in
connection with the Commitment Letter, and CSFB and the other lenders in
connection with the Credit Facilities.

         The foregoing summary of the source and amount of funds is qualified in
its entirety by reference to the text of the Commitment Letter, a copy of which
is filed as an exhibit to the Schedule 14D-1 of Merger Subsidiary and Computer
Associates filed with the Commission in connection with the Offer (the "Schedule
14D-1") and is incorporated in this Offer to Purchase by reference and may be
inspected in the same manner as set forth with respect to the Company in Section
7. If and when definitive agreements with respect to the Credit Facilities are
executed, copies will be filed as exhibits to amendments to the Schedule 14D-1.

         Although no definitive plan or arrangement for repayment of borrowings
under the Credit Facilities have been made, Computer Associates anticipates such
borrowings will be repaid with internally generated funds (including, if the
Merger is accomplished, those of the Company) and from other sources which may
include the proceeds of future bank refinancings, asset sales or the public or
private sale of debt or equity securities. No decision has been made concerning
the method Computer Associates will use to repay the borrowings under the Credit
Facilities. Such decision will be made based on Computer Associates' review from
time to time of the advisability of particular actions, as well as prevailing
interest rates, financial and other economic conditions and such other factors
as Computer Associates may deem appropriate.


<PAGE>

10.  BACKGROUND OF THE OFFER; PAST CONTACTS, TRANSACTIONS OR NEGOTIATIONS WITH
     THE COMPANY.

         Over the course of January and February 1999, Mr. Sanjay Kumar,
President and Chief Operating Officer of Computer Associates, made several
attempts to arrange meetings with Andrew J. Filipowski, Chief Executive Officer
of the Company. By mid-March, Mr. Kumar contacted Mr. Joe Josephson, Managing
Director of Credit Suisse First Boston, a financial advisor to the Company. Mr.
Kumar expressed Computer Associates' interest in exploring strategic alliances
or a possible business combination and encouraged Mr. Josephson to arrange a
meeting for Mr. Kumar with either Mr. Filipowski or the Company's Board of
Directors.

         On March 19, 1999, Mr. Filipowski and Mr. Kumar arranged to meet and on
Monday, March 22, 1999, Mr. Kumar met with Mr. Filipowski for dinner in
Winston-Salem, North Carolina. During the course of the several hour meeting,
Mr. Kumar and Mr. Filipowski discussed the competitive landscape of the software
industry, the businesses of each of their companies and the possibility of a
strategic combination. In response to Mr. Filipowski's concern about the
depressed state of the Company's stock price, Mr. Kumar described Computer
Associates' willingness to consider a higher value in a negotiated transaction
and Mr. Kumar and Mr. Filipowski discussed a range of values.

         By telephone conference calls on Tuesday and Wednesday, Mr. Filipowski
and Mr. Kumar continued the discussions and began to consider the rationale for
a business combination. Once Mr. Filipowski expressed interest in proceeding,
Mr. Kumar and Mr. Filipowski discussed a broad range of values, due diligence
requirements and significant terms of a possible merger agreement.

         On Wednesday morning (March 24), Mr. Kumar consulted Computer 
Associates' advisors, Howard, Smith & Levin LLP, and commenced discussions of 
the steps needed to complete a business combination. Later that morning, 
representatives of Howard, Smith & Levin LLP reviewed with representatives of 
Katten Muchin & Zavis, counsel to Company, and Mr. Josephson the scope of due 
diligence requirements and broad conditions for completing a merger 
agreement. Later that day, representatives of Computer Associates (including 
Mr. Kumar) and Howard Smith & Levin LLP traveled to Chicago and, following 
the execution of a Confidentiality Agreement, begin due diligence review of 
documents and discussions of a merger agreement, consulting and noncompete 
agreements with key executives of the Company and stockholder agreements with 
such executives.

         Also on Wednesday, Mr. Kumar and Mr. Ira Zar, Chief Financial Officer
of Computer Associates, contacted Mr. Michael Faber, Managing Director of Credit
Suisse First Boston, seeking to arrange a credit facility to provide funds for
the possible combination with the Company.

         On Wednesday and Thursday, Mr. Kumar and Mr. Filipowski continued their
discussions by telephone on due diligence items and ranges of value. On Thursday
evening, March 25, the Computer Associates Board of Directors met by telephone
conference to review with management the possible business combination,
including its strategic value, financial analysis, a broad range of values for
the Company and possible sources of financing for the transaction. At the
conclusion of the meeting, the Board authorized management to continue pursuing
the possible combination. Following the call, Mr. Kumar returned to New York.

         On Friday morning, Mr. Kumar reviewed with Mr. Filipowski by telephone
the status of due 

<PAGE>

diligence, the value range for the Company and organizational issues. Later that
day, Mr. Kumar returned to Chicago and met in person with Mr. Filipowski and
with Mr. Michael Cullinane, Chief Financial Officer of the Company. On Saturday,
Mr. Kumar met with Mr. Paul Humenansky, Chief Operating Officer of the Company,
to discuss the status of the proposed merger and operating issues that would
arise in the combination.

         Sunday night, March 28, the Computer Associates Board met again for a
final review of the status of the proposed business combination, the due
diligence effort, the terms of the merger agreement and the proposed financing.
The Board approved the principal terms of the merger agreement and the
financing, and authorized management to complete the transaction.

         Negotiations of the terms of the merger agreement, the consulting 
and noncompete agreements and the stockholder option agreements continued 
into the early hours of Monday morning, March 29. With the principal issues 
resolved, Mr. Kumar returned to New York. Before their opening, the Company 
and Computer Associates notified respectively the NASDAQ and the New York 
Stock Exchange of a pending announcement. At approximately 9:45 a.m. on March 
29, the parties executed a definitive merger agreement, consulting and 
noncompete agreements and stockholder option agreements and Computer 
Associates issued a press release announcing the transaction.

11.  PURPOSE OF THE OFFER; MERGER AGREEMENT; STOCKHOLDER OPTION AGREEMENT;
     CONSULTING AND NON-COMPETE AGREEMENTS; APPRAISAL RIGHTS.

         The purpose of the Offer is to acquire control of, and the entire
equity interest in, the Company. Following the Offer, Computer Associates and
Merger Subsidiary intend to acquire any remaining equity interest in the Company
not acquired in the Offer by consummating the Merger.

         THE MERGER AGREEMENT. The following description of the Merger Agreement
is qualified in its entirety by reference to the text of such agreement, a copy
of which is attached as an exhibit to the Schedule 14D-1 and is incorporated in
this Offer to Purchase by reference and may be inspected in the same manner as
set forth with respect to the Company in Section 7.

         THE OFFER. The Merger Agreement provides for the making of the Offer.
The obligation of Merger Subsidiary to accept for payment or pay for Shares is
subject to the satisfaction of the Minimum Condition and certain other
conditions that are described in Section 15 hereof. Pursuant to the Merger
Agreement, Computer Associates and Merger Subsidiary expressly reserve the right
to waive the conditions to the Offer and to make any change in the terms or
conditions of the Offer; PROVIDED that, without the written consent of the
Company, no change may be made which changes the form of consideration to be
paid, decreases the price per Share or the number of Shares being sought in the
Offer, imposes conditions to the Offer in addition to those set forth in the
Merger Agreement, changes or waives the Minimum Condition, extends the Offer
(except as set forth in the Merger Agreement), or makes any other change to any
condition to the Offer set forth in the Merger Agreement which is adverse to the
holders of Shares.

         CONSIDERATION TO BE PAID IN THE MERGER. The Merger Agreement provides
that, following the purchase of Shares pursuant to the Offer and upon the terms
(but subject to the conditions) set forth in the Merger Agreement, Merger
Subsidiary will be merged with and into the Company (the "Merger"), with the
Company continuing as the surviving corporation (the "Surviving Corporation").
In the Merger, each (i) outstanding Share not held by Computer Associates,
Merger 


<PAGE>

Subsidiary or any subsidiary of either of them or by the Company as treasury
stock (and other than Company Shares, as defined below, as to which appraisal
rights have been exercised in accordance with Delaware Law ("Dissenting
Shares")) and (ii) outstanding share of Series B Preferred (together with the
Shares, the "Company Shares") (other than Dissenting Shares) will be converted
into the right to receive $29.25 in cash or any higher price paid for each Share
in the Offer, without interest. Each share of common stock of Merger Subsidiary
issued and outstanding immediately prior to the time of the Merger will be
converted into and become one share of common stock of the Surviving
Corporation, which will thereupon become a wholly owned subsidiary of Computer
Associates. The Merger Agreement provides that the Merger will be consummated as
soon as practicable after satisfaction of or, to the extent permitted
thereunder, waiver of the conditions to the Merger and shall become effective at
such time as the certificate of merger is duly filed with the Secretary of State
of the State of Delaware or, with the consent of the Independent Directors
referred to below, at such later time as is specified in the certificate of
merger.

         BOARD REPRESENTATION. The Merger Agreement provides that, effective
upon acceptance for payment by Merger Subsidiary of a majority of the Shares
pursuant to the Offer, Computer Associates shall be entitled to designate the
number of directors, rounded up to the next whole number, on the Company's Board
of Directors that equals the product of (i) the total number of directors on the
Company's Board of Directors and (ii) the percentage that the number of Shares
owned by Computer Associates or Merger Subsidiary (including Shares accepted for
payment) bears to the total number of Shares outstanding. The Company has agreed
that it will take all action necessary to cause Computer Associates' designees
to be elected or appointed to the Company's Board of Directors, including
increasing the number of directors or seeking and accepting resignations of
incumbent directors or both; PROVIDED that, prior to the Effective Time, the
Company's Board of Directors shall always have two members who are neither
designees nor affiliates of Computer Associates or Merger Subsidiary nor
employees of the Company (each, an "Independent Director"). No action proposed
to be taken by the Company to amend or terminate the Merger Agreement or waive
any action by Computer Associates or Merger Subsidiary shall be effective
without the approval of both Independent Directors.

         The Merger Agreement provides that, from and after the Effective Time,
the directors and officers of Merger Subsidiary at the Effective Time will be
the initial directors and officers of the Surviving Corporation, each to hold
office until his or her respective successors are duly elected and qualified.
Pursuant to the Merger Agreement, the By-Laws of Merger Subsidiary, as in effect
immediately prior to the Effective Time, will be the By-Laws of the Surviving
Corporation and its Certificate of Incorporation will be amended to be in the
form attached to the Merger Agreement.

         STOCKHOLDER MEETING. The Merger Agreement provides that, if required by
applicable law, the Company will call a meeting of its Stockholders to be held
as soon as reasonably practicable for the purpose of voting on the approval and
adoption of the Merger Agreement and the Merger. Under the Merger Agreement, at
any such meeting, Computer Associates and Merger Subsidiary have agreed to make
a quorum and to vote all Shares acquired in the Offer or otherwise beneficially
owned by them in favor of adoption of the Merger Agreement.

         If the Minimum Condition is satisfied pursuant to the Offer, Merger
Subsidiary will hold at least a majority of the outstanding Shares on a Fully
Diluted Basis and will be able to assure that the requisite number of
affirmative votes in favor of approval and adoption of the Merger Agreement 

<PAGE>

will be received, even if no other Stockholder votes in favor thereof. If Merger
Subsidiary obtains at least 90% of the outstanding Shares, it may effect the
Merger without any notice to and without the authorization of the Stockholders
of the Company pursuant to the "short-form" merger provisions of Delaware Law.

         REPRESENTATIONS AND WARRANTIES. The Merger Agreement contains various
representations and warranties of the parties thereto. These include
representations and warranties of the Company with respect to corporate
existence and power, corporate authorization, governmental authorization,
non-contravention, capitalization, subsidiaries, Commission filings, financial
statements, absence of certain changes, undisclosed liabilities, litigation,
taxes, employee benefits, brokers, compliance with laws, contracts and debt
instruments, environmental matters, intellectual property, Year 2000 compliance,
the Rights Agreement, technology and other matters.

         Computer Associates and Merger Subsidiary have also made certain
representations and warranties with respect to corporate existence and power,
corporate authorization, governmental authorization, non-contravention,
availability of funds and other matters.

         CONDUCT OF BUSINESS PENDING THE MERGER. The Company has agreed that,
during the period from the date of the Merger Agreement to the Effective Time,
the Company will, and will cause its subsidiaries to, carry on their respective
businesses in the ordinary course in substantially the same manner as
theretofore conducted and, to the extent consistent therewith, use all
reasonable efforts to preserve intact their current business organizations, keep
available the services of their current officers and employees and preserve
their relationships with customers, suppliers, licensors, licensees,
distributors and others having business dealings with them. The Company has
further agreed that, during the period from the date of the Merger Agreement to
the Effective Time, the Company will not, and will not permit any of its
subsidiaries to, without the prior written approval of Computer Associates,
(i)(a) declare, set aside or pay any dividends on, or make any other
distributions in respect of, any of its capital stock, other than dividends and
distributions by any direct or indirect wholly owned subsidiary of the Company
to its parent, (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 or (c) purchase, redeem or
otherwise acquire any shares of capital stock of the Company or any of its
subsidiaries or any other securities thereof or any rights, warrants or options
to acquire any such shares or other securities (other than in connection with
the exercise of outstanding company stock options); (ii) issue, deliver, sell,
pledge or otherwise encumber any shares of its capital stock, any other voting
securities or any securities convertible into, or any rights, warrants or
options to acquire, any such shares, voting securities or convertible securities
(other than (A) the issuance of Shares upon the exercise of company stock
options outstanding on the date of the Merger Agreement in accordance with their
terms on such date), (B) conversion of Convertible Subordinated Notes into
Shares, (C) conversion of Series B Stock, (D) issuances under the Stock Purchase
Plan and (E) in the event that, for ministerial reasons, the delivery of the
certificates of the 13,750,523 Shares and options for 3,328,113 Shares pursuant
to the Memco acquisition (which are included in the outstanding shares under the
Merger Agreement) has not been completed by the time the Merger Agreement is
entered into, the completion of the issuance of such Shares and option for such
Shares in such amounts); (iii) amend its articles of incorporation, by-laws or
other comparable charter or organizational documents (other than immaterial
changes, such as mergers of subsidiaries of the Company with other subsidiaries
to 

<PAGE>

implement the Company's internal restructuring); (iv) acquire any business
including through the acquisition of any interest in any corporation,
partnership, joint venture, association or other business organization or
division thereof; (v) (a) mortgage or otherwise encumber or subject to any lien
any of the Company's intellectual property or any other material properties or
assets, (b) except in the ordinary course of business consistent with past
practice and pursuant to existing contracts or commitments, sell, lease,
transfer or otherwise dispose of any of the Company's intellectual property or
any other material properties or assets or (c) except in the ordinary course of
business consistent with past practice or pursuant to existing contracts or
commitments, license any of the Company's intellectual property; (vi) make or
agree to make any new capital expenditures in excess of $500,000; (vii) make any
material tax election (unless required by law) or settle or compromise any
material income tax liability; (viii) pay, discharge or satisfy any claims,
liabilities or obligations (absolute, accrued, asserted or unasserted,
contingent or otherwise), other than the payment, discharge or satisfaction, in
the ordinary course of business consistent with past practice and in accordance
with their terms, of (a) liabilities reflected or reserved against in, or
contemplated by, the most recent consolidated financial statements (or the notes
thereto) of the Company included in the documents filed with the Commission or
(b) liabilities incurred in the ordinary course of business consistent with past
practice, or subject to the fiduciary duties of the Board of Directors of the
Company as advised in writing by counsel to the Company, waive the benefits of,
or agree to modify in any manner, any confidentiality, standstill, or similar
agreement to which the Company or any of its subsidiaries is a party; (ix)
commence a lawsuit other than (a) for the routine collection of bills, (b) to
enforce the Merger Agreement or (c) in such cases where the Company in good
faith determines that the failure to commence suit would result in a material
impairment of a valuable aspect of the Company's business, PROVIDED that the
Company consults with Computer Associates prior to filing such suit; (x) (a)
enter into or amend any employment or severance agreement or similar
arrangements, (b) enter into any agreement pursuant to which the Company or any
of its subsidiaries will provide services for a term of more than 30 days at a
fixed or capped price or otherwise pursuant to terms that are not consistent
with agreements entered into by the Company or any of its subsidiaries in the
ordinary course of business, (c) enter into any customer sale or license
agreement with non-standard terms or at discounts from list prices in excess of
20%, (d) pay commissions to sales employees except on the basis of executed
customer contracts with respect to products actually delivered to customers, (e)
enter into any contracts or series of related contracts in excess of $250,000,
(f) enter into or amend any agreement or arrangement that provides customers
with enhanced rights or refunds of any nature upon a change of control of the
Company or its affiliates, (g) enter into or amend any customer agreements
providing for product replacements, (h) enter into or amend any contract to
provide for "Year 2000" remediation services, (i) make any determination as to
amounts payable under any plan, arrangement or agreement, providing for
discretionary incentive compensation or bonus to any officer, director, employee
or independent contractor of the Company or any of its subsidiaries or (j) enter
into, adopt, or amend any agreement, arrangement, or benefit plan so as to
increase the liability (whether or not contingent) of the Company or Computer
Associates or any of their subsidiaries in respect of compensation or benefits
except as may be required by law; or (xi) authorize any of, or commit or agree
to take any of, the foregoing actions. In the Merger Agreement, Computer
Associates acknowledges and agrees that the foregoing does not prevent (i)
payment of reasonable professional fees and expenses as a result of or in
connection with the Company's negotiation or execution of the Merger Agreement
or the performance of the Company's obligations hereunder, (ii) the Company from
implementing April 1, 1999 salary increases that have already been announced to
employees and provided they are not in 

<PAGE>

excess of 6% in the aggregate, (iii) paying employee, sales and other bonuses
that accrued prior to the date hereof and (iv) the creation of a Rabbi severance
trust and the funding of the severance payments for the top three executives in
the amounts described in the Merger Agreement.

         The Company has agreed to give Computer Associates and its
representatives access (during normal business hours and upon reasonable notice)
to the offices, properties, books and records, of the Company and its
subsidiaries, and to furnish Computer Associates and its representatives with
such other information concerning its business, properties and personnel as such
persons may reasonably request, except as prohibited by any applicable statute,
rule or regulation of any governmental entity.

         HSR ACT FILINGS; EFFORTS. Pursuant to the Merger Agreement, each of
Computer Associates and the Company has agreed to (i) promptly make or cause to
be made the filings required of such party or any of its subsidiaries under the
HSR Act with respect to the transactions contemplated by the Merger Agreement,
(ii) comply at the earliest practicable date with any request under the HSR Act
for additional information, documents, or other material received by such party
or any of its subsidiaries from any Governmental Entity (defined below in this
Section) in respect of such filings or such transactions, and (iii) cooperate
with the other party in connection with any such filing and in connection with
resolving any investigation or other inquiry of any such agency or other
Governmental Entity under any Antitrust Laws (defined below in this Section)
with respect to any such filing or any such transaction. Each of Computer
Associates and the Company has agreed, pursuant to the Merger Agreement, to
promptly inform the other of any communication with, and any proposed
understanding, undertaking, or agreement with, any Governmental Entity regarding
any such filings or any such transaction. The Merger Agreement prohibits both
Computer Associates and the Company from participating in any meeting with any
Governmental Entity in respect of any such filings, investigation, or other
inquiry without giving the other notice of the meeting and, to the extent
permitted by such Governmental Entity, the opportunity to attend and
participate.

         Each of Computer Associates and the Company has agreed, pursuant to the
Merger Agreement, to use all reasonable efforts to resolve such objections, if
any, as may be asserted by any Governmental Entity with respect to the
transactions contemplated by the Merger Agreement under the HSR Act, the Sherman
Act, as amended, the Clayton Act, as amended, the Federal Trade Commission Act,
as amended, and any other Federal, state or foreign statutes, rules,
regulations, orders or decrees that are designed to prohibit, restrict or
regulate actions having the purpose or effect of monopolization or restraint of
trade (collectively, "Antitrust Laws"). In connection therewith, if any
administrative or judicial action or proceeding is instituted (or threatened to
be instituted) challenging any transaction contemplated by the Merger Agreement
as violative of any Antitrust Law, and, if by mutual agreement, Computer
Associates and the Company decide that litigation is in their best interests,
each of Computer Associates and the Company have agreed, pursuant to the Merger
Agreement, to cooperate and use all reasonable efforts vigorously to contest and
resist any such action or proceeding and to have vacated, lifted, reversed, or
overturned any decree, judgment, injunction or other order, whether temporary,
preliminary or permanent (each an "Order"), that is in effect and that
prohibits, prevents, or restricts consummation of the Merger or any such other
transactions. Pursuant to the Merger Agreement, each of Computer Associates and
the Company have agreed to use all reasonable efforts to take such action as may
be required to 

<PAGE>

cause the expiration of the notice periods under the HSR Act or other Antitrust
Laws with respect to such transactions as promptly as possible after the
execution of the Merger Agreement.

         Subject to the fiduciary duties of the Board of Directors of the
Company as advised in writing by counsel to the Company, each of Computer
Associates and the Company has agreed, pursuant to the Merger Agreement, to use
all reasonable 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 Offer, the Merger, and the other
transactions contemplated by the Merger Agreement.

         Notwithstanding the foregoing but subject as described further below,
the Merger Agreement provides that (i) neither Computer Associates nor any of
its subsidiaries shall be required to divest any of their respective businesses,
product lines or assets, (ii) neither Computer Associates nor any of its
subsidiaries shall be required to take or agree to take any other action or
agree to any limitation that could reasonably be expected to have an adverse
effect on the business, assets, condition (financial or otherwise), results of
operations or prospects of Computer Associates and its subsidiaries taken as a
whole or of Computer Associates combined with the Surviving Corporation after
the Effective Time, (iii) neither the Company nor its subsidiaries shall be
required to divest any of their respective businesses, product lines or assets,
or to take or agree to take any other action or agree to any limitation that
could reasonably be expected to have a Material Adverse Effect (defined below in
Section 15), (iv) no party shall be required to agree to the imposition of, or
to comply with, any condition, obligation or restriction on Computer Associates
or any of its subsidiaries or on the Surviving Corporation or any of its
subsidiaries of the type described in clause (a) or (b) of Section 15 of this
Offer and (v) neither Computer Associates nor Merger Subsidiary shall be
required to waive any of the conditions to the Offer described in Section 15 of
this Offer or any of the conditions to the Merger described in this Section 11.

         The Merger Agreement provides that in any case, Computer Associates,
Merger Subsidiary and the Company agree:

                  (i) For a period of 90 days following the last to occur of (A)
substantial compliance by Computer Associates and Merger Subsidiary with any
request under the HSR Act for additional information, documents, or other
material received by such party or any of its subsidiaries from the Federal
Trade Commission or the Department of Justice ("FTC/DOJ") and (B) substantial
compliance by the Company with any request under the HSR Act for additional
information, documents, or other material received by such party or any of its
subsidiaries from FTC/DOJ, Computer Associates and Merger Subsidiary shall
attempt to resolve any objections asserted by FTC/DOJ generally as described
above.

                  (ii) If after the 90 day period set forth above, objections
continue to be asserted by FTC/DOJ which would threaten to prevent completion of
the Merger, (A) first, Computer Associates and the Company shall consult and
mutually determine whether to litigate over the continuing objections, or (B) if
within five days Computer Associates and the Company do not mutually agree to
litigate, the Company shall have the right for a period of 30 days to meet
separately with FTC/DOJ to develop a plan to resolve the continuing objections,
such resolution to be on a basis 

<PAGE>

reasonably calculated to meet the objections of the FTC/DOJ. During this period,
the Company will continue to keep Computer Associates and Merger Subsidiary
informed of its discussions and consult with Computer Associates and Merger
Subsidiary on possible resolutions of the continuing objections.

                  (iii) After the Company and FTC/DOJ have agreed upon a plan,
Computer Associates shall have a period of 90 days after such plan has been
provided to Computer Associates in which to effect the plan, or a similar plan
to which FTC/DOJ consents or otherwise indicates its willingness for Computer
Associates to proceed so as to permit the consummation of the Merger. Computer
Associates shall not be obligated to effect on the plan in any specific manner
and shall not be required to refrain from discussing changes to the plan with
either the Company or FTC/DOJ.

                  (iv) If Computer Associates has not within the 90 day period
completed effecting the plan as contemplated by the preceding clause (iii),
then, Computer Associates shall choose one of the following:

                  (A) within 15 days, fully resolve any continuing objection or
          enter into a consent decree on reasonable terms setting forth the
          terms of the plan developed by the Company and FTC/DOJ under the
          preceding clause (ii), or

                  (B) (1) escrow an amount equal to the aggregate purchase price
         for the number of Shares representing the Minimum Condition, on terms
         outlined in the Merger Agreement, and (2) use all reasonable efforts
         vigorously to contest and resist any action or proceeding instituted
         by FTC/DOJ.

In the event that Computer Associates chooses to contest or resist any action or
proceeding instituted by FTC/DOJ under the preceding clause (iv), the Company
shall fully cooperate with and support Computer Associates in such efforts.

                  (v) Computer Associates may at any time, in lieu of continuing
with the provisions of the preceding clauses (i) through (iii) above, elect to
immediately follow the provisions of the preceding clause (iv)(B).

                  (vi) In the event Computer Associates has elected, pursuant to
the preceding clause (iv)(B), to contest or resist any action or proceeding
instituted by FTC/DOJ and a final, nonappealable order by a court of competent
jurisdiction has been issued which prevents the completion of the Merger, then
Computer Associates and the Company will take the following steps:

                  (A) The Company will increase its Board of Directors from
         seven to 14 and elect seven members nominated by Computer Associates.
         The new Board of Directors will work together to take all steps,
         including disposition of assets, to remove any FTC/DOJ objections to
         completing the Merger.

                  (B) In the event that, after 90 days, the new Board of
         Directors is unable to agree to a plan to resolve the FTC/DOJ
         objections, then the Board will delegate the responsibility to (1)
         develop a plan to resolve the FTC/DOJ objections to a three person
         committee of Sanjay 

<PAGE>

         Kumar (or in his absence, a designee of Computer Associates' Board),
         Andrew J. Filipowski (or in his absence, a designee of the Company's
         Board) and a senior member of Credit Suisse First Boston and (2)
         execute such plan.

         STOCK OPTIONS. The Merger Agreement provides that, at or immediately
prior to the Effective Time, each outstanding Company Option (defined below)
which is vested or which pursuant to the terms of the relevant Stock Plan
(defined below) become vested by virtue of the Offer or the Merger shall be
canceled, and each holder of any such option shall be paid by the Company
promptly after the Effective Time for each such option an amount determined by
multiplying (i) the excess, if any, of $29.25 per Share over the applicable
exercise price of such option by (ii) the number of Shares such holder could
have purchased had such holder exercised such option in full immediately prior
to the Effective Time (as if such Company Option was exercisable in full);
subject to the limitations set forth in an amendment to certain option
agreements with respect to the Company Options issued in 1999 to certain
executives. The Merger Agreement further provides that the Company shall take
such action or, if required, shall amend each of the Company's Stock Plans that
do not provide for the vesting of unvested Company Options by virtue of the
Offer or the Merger so that, at the Effective Time, each of the then outstanding
unvested Company Options shall by virtue of the Merger, and without any further
action on the part of any holder thereof, be assumed by Computer Associates and
converted into an option to purchase that number of shares of common stock, par
value $.10 per share ("Computer Associates Common Stock"), of Computer
Associates determined by multiplying the number of Shares subject to such
Company Option at the Effective Time by the quotient obtained by dividing (x)
$29.25 by (y) the average closing price of Computer Associates Common Stock on
the New York Stock Exchange Composite Tape for the 30 consecutive trading days
immediately prior to the Effective Time (such quotient, the "Conversion
Number"), at an exercise price per share of Computer Associates Common Stock
equal to the quotient obtained by dividing (x) the exercise price per Share of
such Company Option immediately prior to the Effective Time by (y) the
Conversion Number. If the foregoing calculation results in an assumed Company
Option being exercisable for a fraction of a share of Computer Associates Common
Stock, then the number of shares of Computer Associates Common Stock subject to
such option shall be rounded down to the nearest whole number of shares. The
term, exercisability, vesting schedule, status as an "incentive stock option"
under Section 422 of the Code, if applicable, and all other terms and conditions
of Company Options will, to the extent permitted by law and otherwise reasonably
practicable, be unchanged. Continuous employment with the Company or any of its
subsidiaries shall be credited to the optionee for purposes of determining the
vesting of the number of shares of Computer Associates Common Stock subject to
exercise under the optionee's assumed Company Option after the Effective Time.
"Company Options" means any option granted, and not exercised or expired, to a
current or former employee, director or independent contractor of the Company or
any of its subsidiaries or any predecessor thereof to purchase Shares pursuant
to any stock option, stock bonus, stock award, or stock purchase plan, program,
or arrangement of the Company or any of its subsidiaries or any predecessor
thereof (collectively, the "Stock Plans") or any other contract or agreement
entered into by the Company or any of its subsidiaries.

         Pursuant to the Merger Agreement, Computer Associates agreed to take
all corporate action necessary to reserve for issuance a sufficient number of
shares of Computer Associates Common Stock for delivery pursuant to the terms
described in the immediately preceding paragraph. Pursuant 

<PAGE>

to the Merger Agreement, Computer Associates agreed to cause the shares of
Computer Associates Common Stock issuable upon exercise of the assumed Company
Options to be registered, or to be issued pursuant to a then effective
registration statement, no later than 45 days after the Effective Time on Form
S-8 (or any successor form thereto) promulgated by the Commission, and to use
its best efforts to maintain the effectiveness of such registration statement or
registration statements for so long as such assumed Company Options remain
outstanding.

         OTHER OFFERS. Pursuant to the Merger Agreement, the Company has agreed
that, until the termination of the Merger Agreement, the Company and its
subsidiaries will not, and will not authorize or permit the officers, directors,
employees or other agents of the Company and its subsidiaries to, directly or
indirectly, (i) take any action to solicit, initiate or encourage any
Acquisition Proposal (defined below) or (ii) subject to the fiduciary duties of
the Board of Directors under applicable law, as advised in writing by counsel to
the Company, and in response to an unsolicited request therefor by a person who
a majority of the Board believes intends to submit a Superior Acquisition
Proposal (defined below), engage in negotiations with, or disclose any nonpublic
information relating to the Company or any of its subsidiaries or afford access
to the properties, books or records of the Company or any of its subsidiaries
to, any person that has advised the Company or otherwise publicized the fact
that it may be considering making, or that has made, an Acquisition Proposal;
PROVIDED, the foregoing shall not prohibit the Company's Board of Directors from
taking and disclosing to the Company's stockholders a position with respect to a
tender offer pursuant to Rules 14d-9 and 14e-2 promulgated under the Exchange
Act. The Company has agreed to promptly notify Computer Associates after receipt
of any Acquisition Proposal or any notice that any person is considering making
an Acquisition Proposal or any request for nonpublic information relating to the
Company or any of its subsidiaries or for access to the properties, books or
records of the Company or any of its subsidiaries by any person that has advised
the Company or otherwise publicized the fact that it may be considering making,
or that has made, an Acquisition Proposal and will keep Computer Associates
fully informed of the status and details of any such Acquisition Proposal,
indication or request. "Acquisition Proposal" means any offer or proposal for,
or any written indication of interest in, a merger or other business combination
involving the Company or any of its subsidiaries or the acquisition of any
significant equity interest in, or a significant portion of the assets of, the
Company or any of its subsidiaries, other than the transactions contemplated by
the Merger Agreement; and "Superior Acquisition Proposal" means an Acquisition
Proposal which a majority of the disinterested directors determines in its good
faith judgment (based on advice of the Company's independent financial advisor)
to be more favorable to the Company's stockholders than the Offer or the Merger,
and for which financing, to the extent required, is then committed.

         AGREEMENT WITH RESPECT TO DIRECTOR AND OFFICER INDEMNIFICATION AND
INSURANCE. Pursuant to the Merger Agreement, for a period of six years after the
Effective Time, Computer Associates and the Surviving Corporation will indemnify
and hold harmless the present and former officers, directors, employees and
agents of the Company (the "Indemnified Parties") in respect of acts or
omissions occurring on or prior to the Effective Time to the extent provided
under the Company's certificate of incorporation and by-laws in effect on the
date of the Merger Agreement, provided that such indemnification shall be
subject to any limitation imposed from time to time under applicable law.
Computer Associates has further agreed that it will cause to be maintained for a
period of not less than two years from the Effective Time the Company's current
directors' and officers' insurance 

<PAGE>

and indemnification policy to the extent that it provides coverage for events
occurring prior to the Effective Time (the "D&O Insurance") for all persons who
are directors and officers of the Company on the date of the Merger Agreement,
so long as the annual premium therefor would not be in excess of 105% of the
amount per annum the Company paid in its last full fiscal year, which amount has
been disclosed to Computer Associates. Computer Associates also agreed that if
the existing D&O Insurance cannot be maintained, expires or is terminated or
canceled during such two-year period, Computer Associates will use all
reasonable efforts to cause to be obtained as much D&O Insurance as can be
obtained for the remainder of such period for an annualized premium not in
excess of 105% of the amount per annum the Company paid in its last full fiscal
year, which amount has been disclosed to Computer Associates, on terms and
conditions substantially similar to the existing D&O Insurance. Without
limitation of the foregoing, in the event any such Indemnified Party is or
becomes involved in any capacity in any action, proceeding or investigation in
connection with any matter relating to the Merger, the Offer or the Merger
Agreement occurring on or prior to the Effective Time, Computer Associates shall
pay as incurred such Indemnified Party's reasonable legal and other expenses
(including the cost of any investigation and preparation) incurred in connection
therewith.

         OTHER AGREEMENTS. Computer Associates has agreed that it will take all
action necessary to cause Merger Subsidiary to perform its obligations under the
Merger Agreement and to consummate the Offer and the Merger on the terms and
conditions set forth in the Merger Agreement.

         The Merger Agreement provides that the Board of Directors of the
Company shall take all further action requested in writing by Computer
Associates (including redeeming the Rights immediately prior to the Effective
Time of the Merger or amending the Rights Agreement) in order to render the
Rights inapplicable to the Offer, the Merger and the other transactions
contemplated by the Merger Agreement and the Stockholder Option Agreement.
Except as expressly provided in the Merger Agreement or as requested in writing
by Computer Associates, the Board of Directors of the Company shall not (i)
amend the Rights Agreement or (ii) take any action with respect to, or make any
determination under, the Rights Agreement (including a redemption of the
Rights).

         Except as otherwise provided in the Merger Agreement, Computer
Associates has agreed to honor (or to cause the Surviving Corporation to honor)
in accordance with their terms all benefit plans (including employment
agreements) previously delivered to Computer Associates and all accrued benefits
vested thereunder; it being understood and agreed that nothing in this sentence
shall prevent Computer Associates or the Surviving Corporation from terminating
any such benefit plan in accordance with its terms.

         In the event that at any time the Company is subject to a material lack
of cash liquidity and as a result the Board of Directors of the Company declares
a cash emergency, upon notice thereof by the Company to Computer Associates,
Computer Associates shall, if requested by the Company, work with the Company
during such time to help the Company secure necessary financing through such
efforts as Computer Associates shall reasonably determine to be appropriate. The
foregoing shall not require any loan, guarantee or other economic support by
Computer Associates or any payments by Computer Associates to the Company or any
other person. In the event that such financing is not obtained by the Company
and the cash emergency is continuing notwithstanding the efforts made by Company
and Computer Associates as described above, Computer Associates shall, as a last
resort, purchase such receivables of the Company upon such terms as the Company
and 

<PAGE>

Computer Associates shall mutually agree.

         CONDITIONS TO THE MERGER. Pursuant to the Merger Agreement, the
respective obligations of each party to consummate the Merger are subject to the
satisfaction or waiver, where permissible, at or before the Effective Time of
the following conditions: (i) Computer Associates or Merger Subsidiary shall
have purchased Shares in an amount equal to at least the Minimum Condition
pursuant to the Offer, (ii) the adoption of the Merger Agreement by the
Stockholders in accordance with Delaware Law, (iii) no provision of any
applicable law or regulation and no judgment, injunction, order or decree shall
prohibit the consummation of the Merger; (iv) any applicable waiting period
under the HSR Act relating to the Merger shall have expired, and (v) other than
filing the certificate of merger in accordance with Delaware Law, all consents,
approvals, orders or authorizations or registrations, declarations or filings or
exemptions (collectively, "Consents") required to consummate the Merger shall
have been filed, occurred or been obtained other than those the absence of which
would not have a Material Adverse Effect.

         TERMINATION. The Merger Agreement may be terminated at any time prior
to the Effective Time (notwithstanding any approval of the Merger Agreement by
the Stockholders) (i) by mutual written consent of the Company and Computer
Associates, (ii) by either the Company or Computer Associates, if there shall be
any law or regulation that makes consummation of the Merger illegal or otherwise
prohibited, subject to complying with the provisions described above relating to
objections of the FTC/DOJ, (iii) by the Company if Computer Associates shall
have failed to commence the Offer within five business days following the date
of the Merger Agreement or if the Offer shall have been terminated without
Computer Associates or Merger Subsidiary having purchased any Shares pursuant to
the Offer, (iv) by Computer Associates upon the occurrence of any Trigger Event
described in clauses (i) through (iv) under the heading "Fees and Expenses"
below, (v) by Computer Associates if the Offer shall have expired or been
terminated in accordance with the terms of the Merger Agreement without Computer
Associates or Merger Subsidiary having purchased any Shares pursuant to the
Offer, (vi) by the Company, at any time after the 60th day following the later
of (x) the date the HSR Act waiting period expires and (y) the first date the
conditions set forth in clause (a) and (b) under Section 15 (Certain Conditions
to the Offer) below cease to exist or (iv) by the Company, upon the occurrence
of any Trigger Event described in clause (iv) under the heading "Fees and
Expenses" below.

         FEES AND EXPENSES. Each party to the Merger Agreement has agreed to pay
its own fees and expenses and there are no provisions for payment by the Company
of the fees and expenses of Computer Associates or Merger Subsidiary or vice
versa, if the Merger Agreement is terminated, except as stated below. The
Company has agreed to pay Computer Associates a fee in immediately available
funds equal to $180,000,000 promptly, but in no event later than one business
day, after the termination of the Merger Agreement as a result of the occurrence
of any of the events set forth below (a "Trigger Event"): (i) the Company shall
have entered into, or shall have publicly announced its intention to enter into,
an agreement or an agreement in principle with respect to any Acquisition
Proposal, (ii) any representation or warranty made by the Company in, or
pursuant to, the Merger Agreement that is qualified as to materiality shall not
have been true and correct when made or any representation or warranty made by
the Company in, or pursuant to, the Merger Agreement that is not so qualified
shall not have been true and correct in all material respects when made or the
Company shall have failed to observe or perform in any material respect any of
its 

<PAGE>

obligations under the Merger Agreement; PROVIDED that it shall not be a Trigger
Event unless either (A) the breaches of the representations and warranties
without regard to any materiality qualifier or threshold, and failure to perform
or breach of any obligation, individually or in the aggregate, could reasonably
be expected to have a Material Adverse Effect or (B) the breaches of certain
representations and warranties regarding capital structure, taxes, brokers, fees
and expenses, material contracts and the Rights Agreement without regard to any
materiality qualifier or threshold, and failure to perform or breach of any
obligation, individually or in the aggregate, could reasonably be expected to
result in a loss or damage of $22,500,000 or more, (iii) the Board of Directors
of the Company (or any special committee thereof) shall have withdrawn or
materially modified in a manner adverse to Computer Associates or Merger
Subsidiary its approval or recommendation of the Offer, the Merger or the Merger
Agreement or its approval of the entry by Computer Associates and Merger
Subsidiary into the Stockholder Option Agreement, in any such case whether or
not such withdrawal or modification is required by the fiduciary duties of the
Company's Board of Directors (or any special committee thereof); or (iv) prior
to the purchase of any Shares under the Offer, the Company shall have received
any Acquisition Proposal which the Company's Board of Directors has determined
is more favorable to the Stockholders than the transactions contemplated by the
Merger Agreement, whether or not such determination is required by the fiduciary
duties of the Company's Board of Directors.

         The Company has also agreed that if the Merger Agreement is terminated
as a result of the occurrence of a Trigger Event, it shall promptly assume and
pay, or reimburse Computer Associates for, all fees payable and expenses
incurred by Computer Associates (including the fees and expenses of its counsel)
in connection with the Merger Agreement to a maximum of $10,000,000.

         In consideration of entering into the Merger Agreement, the Company has
agreed to pay to Computer Associates, in connection with the execution of the
Merger Agreement, a non-refundable fee (or provided a direct draw letter of
credit in the amount) of $20,000,000.

         APPRAISAL RIGHTS. Stockholders do not have dissenters' rights as a
result of the Offer. However, if the Merger is consummated, Stockholders at the
time of the Merger who do not vote in favor of or consent in writing to the
Merger will have the right under Delaware Law to dissent and demand appraisal of
their Shares in accordance with Section 262 of Delaware Law.

         Under Delaware Law, dissenting stockholders who comply with the
applicable statutory procedures will be entitled to receive a judicial
determination of the fair value of their Shares (exclusive of any element of
value arising from the accomplishment or expectation of the Merger) and to
receive payment of such fair value in cash, together with a fair rate of
interest, if any. Any such judicial determination of the fair value of the
Shares could be based upon considerations other than or in addition to the price
paid in the Offer (or the Merger) and the market value of the Shares.
Stockholders should recognize that the value so determined could be higher or
lower than the price per Share paid pursuant to the Offer or the Merger.
Moreover, Computer Associates or Merger Subsidiary may argue in an appraisal
proceeding that, for purposes of such a proceeding, the fair value of the Shares
is less than the price paid in the Offer (or the Merger).

         THE FOREGOING SUMMARY OF THE RIGHTS OF DISSENTING STOCKHOLDERS DOES NOT
PURPORT TO BE A COMPLETE STATEMENT OF PROCEDURES TO BE FOLLOWED BY STOCKHOLDERS
DESIRING TO EXERCISE THEIR DISSENTERS' RIGHTS.

<PAGE>

         STOCKHOLDER OPTION AGREEMENT. The following description of the
Agreement (the "Stockholder Option Agreement") dated as of March 29, 1999 among
Merger Subsidiary and the Stockholders named therein (each a "Principal
Stockholder") is qualified in its entirety by reference to the text of such
agreement, a copy of which is attached as an exhibit to Merger Subsidiary's and
Computer Associates' Schedule 14D-1 with respect to the transaction contemplated
hereby filed with the Commission pursuant to the Exchange Act.

         Under the Stockholder Option Agreement, each Principal Stockholder has
granted Merger Subsidiary the option (the "Stock Option") to purchase, subject
to the terms and conditions set forth in the Stockholder Option Agreement, for a
price of $29.25 per Share in cash, or to cause to be tendered pursuant to the
Offer, such Principal Stockholder's Shares. In addition, if the price to be paid
by Merger Subsidiary pursuant to the Offer is increased, the purchase price
payable upon exercise of the Stock Option shall similarly be increased. The
Stockholder Option Agreement also provides that the number and kind of Shares
subject to the Stock Option and the purchase price therefor shall be
appropriately and equitably adjusted in the event of changes in the Company's
capital stock.

         Subject to the terms of the Stockholder Option Agreement, Merger
Subsidiary has the right to exercise the Stock Option, in whole or in part, at
any time up to 30 business days after the termination of the Merger Agreement.

         Each Principal Stockholder has agreed, in the Stockholder Option
Agreement, upon receipt of instructions from Merger Subsidiary, to deliver to
the Depositary (i) a Letter of Transmittal with respect to such Principal
Stockholder's Shares complying with the terms of the Offer together with
instructions directing the Depositary to make payment for such Shares directly
to the Principal Stockholder (but if such Shares are not accepted for payment or
are withdrawn and are to be returned pursuant to the Offer, to return such
Shares to such Principal Stockholder whereupon they shall continue to be held by
such Principal Stockholder subject to the terms and conditions of the
Stockholder Option Agreement), (ii) the certificates evidencing such Principal
Stockholder's Shares and (iii) all other documents or instruments required to be
delivered pursuant to the terms of the Offer.

         The Principal Stockholders' obligations to sell their Shares (other
than by tendering pursuant to the Offer) under the Stockholder Option Agreement
are subject to the satisfaction of the following conditions: (i) the
representations and warranties of Merger Subsidiary set forth in the Stockholder
Option Agreement shall be true and correct in all material respects on the date
of sale, (ii) the applicable waiting period under the HSR Act to the exercise of
the Stock Option shall have expired or been terminated, (iii) there shall be no
preliminary or permanent injunction or other order, decree or ruling issued by a
court of competent jurisdiction or by a governmental, regulatory or
administrative agency or commission, nor any statute, rule, regulation or order
promulgated or enacted by any governmental authority, prohibiting or otherwise
restraining such exercise of the Stock Option, and (iv) Merger Subsidiary shall
have commenced the Offer.

         Each Principal Stockholder has further agreed to not, directly or
indirectly, solicit, initiate or encourage (or authorize any person to solicit)
any inquiry, proposal or offer from any person to acquire the business, property
or capital stock of the Company, or any direct or indirect subsidiary thereof,
or any acquisition of a substantial equity interest in, or a substantial amount
of assets of, the 

<PAGE>

Company or any direct or indirect subsidiary thereof, whether by merger,
purchase of assets, tender offer or other transaction (a "Business Combination
Proposal") or, subject to a Principal Stockholder's fiduciary duty as a director
of the Company, if applicable, as further provided in the Merger Agreement
participate in any discussion or negotiations regarding, or furnish to any other
person any information with respect to, or otherwise cooperate in any way with,
or participate in, facilitate or encourage any effort or attempt by any other
person to make or seek any Business Combination Proposal. Each Principal
Stockholder agreed to promptly advise Merger Subsidiary of the terms of any
communication it may receive relating to a Business Combination Proposal.

         In entering into the Stockholder Option Agreement, each Principal
Stockholder granted Merger Subsidiary a proxy to vote or consent (i) in favor of
the adoption of the Merger Agreement and the Stockholder Option Agreement and
approval of the Merger and the other transactions contemplated by the Merger
Agreement and Stockholder Option Agreement, (ii) against any proposal for any
recapitalization, merger, sale of assets or other business combination between
the Company and any person or entity (other than the Merger) or any other action
or agreement that would result in a breach of any covenant, representation or
warranty or any other obligation or agreement of the Company under the Merger
Agreement not being fulfilled, and (iii) in favor of any other matter relating
to consummation of the transactions contemplated by the Merger Agreement and the
Stockholder Option Agreement. Each Principal Stockholder also agreed to cause
such Principal Stockholder's Shares that are outstanding and owned by it
beneficially to be voted in accordance with the foregoing. The proxy will be
automatically revoked upon termination of the Stock Option's exercise period in
accordance with the terms of the Stockholder Option Agreement other than for
Shares which are the subject of a closing under the Stockholder Option
Agreement.

         Stockholders holding an aggregate of up to 10,273,680 Shares are
parties to the Stockholder Option Agreement. Assuming that the full amount of
Shares that are subject to the Stockholder Option Agreement are validly tendered
and not withdrawn pursuant to a directive from Merger Subsidiary, approximately
60,593,458 additional Shares would be required to be tendered under the Offer in
order to satisfy the Minimum Condition (assuming the number of Fully Diluted
Shares set forth in the Introduction hereto).

         The number of Shares set forth above includes 547,994 Shares held by a
limited partnership (Platinum Ventures) of which one of the Principal
Stockholders, Mr. Filipowski, is a limited partner and over which Mr. Filipowski
has voting control (the "LP Shares"). The LP Shares will be tendered in the
Offer if requested by the Merger Subsidiary, and are subject to the proxy
granted in Stockholder Option Agreement, but are not subject to the Option
unless they are withdrawn from the limited partnership. In addition, Mr.
Filipowski has represented to the Merger Subsidiary that the Options and Shares
owned by Mr. Filipowski are (i) deposited in a brokerage account pursuant to
which they have been pledged to secure margin loans upon standard terms and (ii)
are subject to a "put/call collar" arrangement with the brokerage (or its
affiliate) in which such shares are so deposited. The Merger Subsidiary's rights
under the Stockholder Option Agreement are subject to such arrangements so long
as they remain in effect, except that, to the extent of rights or other benefits
of ownership retained by Mr. Filipowski in such options (or the Shares issuable
upon the exercise thereof) and the other Shares owned by him, the Stockholder
Option Agreement is not subject to such arrangements.

         Merger Subsidiary reserves the right to transfer or assign, in whole or
from time to time in 

<PAGE>

part, to any of its affiliates its rights under the Stockholder Option
Agreement.

         References in this description of the Stockholder Option Agreement to
Shares include any Shares issuable to any Principal Stockholder upon the
exercise of any options held by such Principal Stockholder.

         CONSULTING AND NON-COMPETE AGREEMENT. The following description of the
Consulting and Non-Compete Agreement is qualified in its entirety by reference
to the text of such agreement, a copy of which is attached as an exhibit to the
Schedule 14D-1 and is incorporated into this Offer to Purchase by reference and
may be inspected in the same manner as set forth in Section 7.

         The Company and each of Andrew J. Filipowski, Michael P. Cullinane and
Paul L. Humenansky (each, the "Consultant") have entered into Consulting and
Non-Compete Agreements (each, a "Consulting Agreement" and together the
"Consulting Agreements") pursuant to which each Consultant has agreed to provide
consulting services to the Company for a two year period commencing on the
consummation of the Merger (the "Consulting Period"). As compensation for the
Consultant's services, the Company has agreed to pay consulting fees to Mr.
Filipowski at the rate of $1,000,000 per annum and to each of Mr. Cullinane and
Mr. Humenansky at the rate of $500,000 per annum. The Consulting Agreements only
become effective upon consummation of the Merger. If the Merger Agreement
terminates, each Consulting Agreement also terminates.

         Each of the Consulting Agreements provides that if the Company
terminates the Consulting Period without Cause (as defined below) or the
Consultant dies or becomes Disabled (as such term is defined in the Consulting
Agreement), the Consultant shall be entitled to the continued payment of all
consulting fees. If either (i) the Company terminates the Consulting Period for
Cause or (ii) the Consultant terminates the Consulting Period, the Consultant
shall be entitled to receive consulting fees paid through date of termination.
"Cause" is defined in the Consulting Agreements to mean (i) the Consultant's
material breach of any material term of the Consulting Agreement, subject to the
Consultant's right to cure any breach that is curable within a reasonable period
following notice by the Company, (ii) the Consultant's conviction of a felony,
or (iii) any willful misconduct by the Consultant resulting in substantial loss
to the Company, substantial damage to the Company's reputation or judicially
determined theft or misappropriation from the Company.

         In their respective Consulting Agreements, Mr. Cullinane and Mr.
Humenansky have each agreed, at the request of the Company, that for a period
(the "Transition Employment Period") of up to six months from the Effective Date
but in no event later than September 30, 1999, to remain as an employee to
provide transition services in a capacity substantially similar to each
Consultant's current employment with the Company and with continuation of
compensation on the same basis as current compensation.

         The Consulting Agreements also contain non-competition provisions which
prohibit for a period beginning on the Effective Date and ending, in the case of
Mr. Filipowski, on the eighth anniversary of the Effective Date and, in the case
of each of Mr. Cullinane and Mr. Humenansky, on the fifth anniversary of the
later of the Effective Date and the end of the Transition Employment Period,
from participating or engaging in any activities or business developing,
manufacturing, marketing or distributing any products or services offered by the
Company on the date of the Consulting Agreement, or any products or services
offered by the Company in the future and in 

<PAGE>

which the Consultant actively participated. The Consulting Agreements also
prohibit each Consultant from soliciting, recruiting or hiring any employees of
the Company (or any of its affiliates) or persons who have worked for the
Company (or any of its affiliates) at any time since January 1, 1998 and
soliciting or encouraging any employee of the Company (or any of its affiliates)
to leave the employment of the Company except each Consultant (i) may hire (but
not solicit or recruit) any terminated employee of the Company and employees of
the Company in connection with a business that is not a Competitive Activity (as
such term is defined in the Consulting Agreement) and (ii) may solicit, recruit
or hire employees of the Company to work in certain venture capital investment
businesses. As compensation for each Consultant entering into a non-compete
agreement, the Company has agreed to pay to Mr. Filipowski, Mr. Cullinane and
Mr. Humenansky a non-compete payment of $23,000,000, $10,500,000 and
$10,500,000, respectively ("Non-compete Payments") which shall be paid to Mr.
Filipowski over an eight year period and to each of Mr. Cullinane and Mr.
Humenansky over a five year period. Each Consultant is permitted (i) to remain a
director at those companies for which Consultant is a director as of the
Effective Date, (i) to engage in venture capital activities so long as the
Consultant does not invest in any company whose primary business is a
Competitive Activity, (iii) to engage in Competitive Activities after the third
anniversary of the Effective Date with the written permission of the Company
(which shall not be unreasonable withheld) so long as the Consultant's
activities would not have a material adverse impact on any of the Company's
lines of business and (iv) to engage in activities that Computer Associates
confirms are not inconsistent with the provisions of the Consulting Agreement.

         In addition, the Consulting Agreement provides (i) that each Consultant
shall not disclose to any other person or use any confidential information
relating to or used by the Company or any of its affiliates, whether in written,
oral or other form, except in connection with the performance of the
Consultant's duties under the Consulting Agreement and (ii) that if a Consultant
breaches any non-competition provision or confidentiality provision, at any
time, the Consultant may have to repay, as liquidated damages, the full amount
of the non-compete payments to the Consultant.

         The Consultants have also agreed to be liable for any loss or damage in
excess of $1,500,000 resulting from the Company's failure to observe the conduct
of business covenants set forth in the Merger Agreement and described above. Mr.
Filipowski, Mr. Cullinane and Mr. Humenansky shall be liable for 49%, 22% and
22%, respectively, of such loss or damage and their aggregate liability for such
loss or damage is the sum of the total payments under their respective
Consulting Agreement and the value of the options to purchase Shares issued to
each Consultant in 1999, in the amount of 675,000 options, 350,000 options and
400,000 options, respectively.

         The Consultants have also agreed to the amendment of the terms of the
Company Options granted to the Consultants in March 1999 such that none of such
Company Options are exercisable until the closing of the Offer and the
percentage of such Company Options that are exercisable thereafter shall depend
on the date that all antitrust issues, if any, with the FTC/DOJ or other
governmental entity that are required to be resolved prior to the completion of
the Merger shall have been resolved.

         DELAWARE LAW. In addition, the Merger would have to comply with other
applicable procedural and substantive requirements of Delaware Law, including
any duties to other stockholders imposed upon a controlling or, if applicable,
majority stockholder. Several recent decisions by the Delaware courts, which may
or may not apply to the Merger, have held that a 

<PAGE>

controlling stockholder of a company involved in a merger has a fiduciary duty
to other stockholders which requires that the merger be "entirely fair" to such
other stockholders. In determining whether a merger is fair to minority
stockholders, Delaware courts have considered, among other things, the type and
amount of the consideration to be received by the stockholders and whether there
was fair dealing among the parties.

         The Company is incorporated under the laws of the State of Delaware,
which has adopted certain laws regarding business combinations. In general,
Section 203 of Delaware Law prevents an "interested stockholder" (generally, a
stockholder owning 15% or more of a corporation's outstanding voting stock or an
affiliate or associate thereof) from engaging in a "business combination"
(defined to include a merger and certain other transactions) with a Delaware
corporation for a period of three years following the time that such stockholder
became an interested stockholder unless (i) prior to such time the corporation's
board of directors approved either the business combination or the transaction
which resulted in such stockholder becoming an interested stockholder, (ii) upon
consummation of the transaction which resulted in such stockholder becoming an
interested stockholder, the interested stockholder owned at least 85% of the
corporation's voting stock outstanding at the time the transaction commenced
(excluding shares owned by certain employee stock plans and persons who are
directors and also officers of the corporation) or (iii) at or subsequent to
such time the business combination is approved by the corporation's board of
directors and authorized at an annual or special meeting of stockholders, and
not by written consent, by the affirmative vote of at least 66 2/3% of the
outstanding voting stock not owned by the interested stockholder. The Board of
Directors of the Company has approved the Merger Agreement and the transactions
contemplated thereby, including the Offer and the Merger, for purposes of
Section 203. Accordingly, the restrictions of Section 203 do not apply to the
transactions contemplated by this Offer to Purchase.

         OTHER MATTERS. Any merger or other similar business combination
proposed by Computer Associates would also have to comply with any applicable
Federal law. In particular, the Commission has adopted Rule 13e-3 under the
Exchange Act which is applicable to certain "going private" transactions.
Computer Associates believes that Rule 13e-3 will not be applicable to the
Merger unless the Merger is consummated more than one year after termination of
the Offer or if an alternative merger transaction were to provide for
stockholders to receive consideration for their Shares in an amount less than
the price per Share paid pursuant to the Offer. If applicable, Rule 13e-3 would
require, among other things, that certain financial information concerning the
Company and certain information relating to the fairness of the proposed
transaction and the consideration offered to minority stockholders in such a
transaction be filed with the Commission and distributed to such stockholders
prior to consummation of the transaction.

         If for any reason the Merger is not consummated, Computer Associates
and Merger Subsidiary will evaluate their alternatives. Such alternatives could
include purchasing additional Shares in the open market, in privately negotiated
transactions, in another tender or exchange offer or otherwise, or taking no
further action to acquire additional Shares. Any additional purchases of Shares
could be at a price greater or less than the price to be paid for Shares in the
Offer and could be for cash or other consideration. Alternatively, Merger
Subsidiary may sell or otherwise dispose of any or all Shares acquired pursuant
to the Offer or otherwise. Such transactions may be effected on terms and at
prices then determined by Computer Associates or Merger Subsidiary, which may

<PAGE>

vary from the price to be paid for Shares in the Offer.

         Computer Associates intends to conduct a review of the Company and its
assets, corporate structure, dividend policy, capitalization, operations,
properties and policies and to consider, subject to the terms of the Merger
Agreement, what, if any, changes would be desirable in light of the
circumstances then existing, and reserves the right to take such actions or
effect such changes as it deems desirable. Such changes could include changes in
the Company's business, operations, corporate structure, capitalization, Board
of Directors, policies or dividend policy.

         Except as otherwise described in this Offer to Purchase, Computer
Associates and Merger Subsidiary have no current plans or proposals that would
relate to, or result in, any extraordinary corporate transaction involving the
Company, such as a merger, reorganization or liquidation involving the Company
or any of its subsidiaries, a sale or transfer of a material amount of assets of
the Company or any of its subsidiaries, any material change in the Company's
capitalization or dividend policy or any other material change in the Company's
business, corporate structure, Board of Directors or management.

12.  EFFECT OF THE OFFER ON THE MARKET FOR THE SHARES; STOCK QUOTATIONS;
     REGISTRATION UNDER THE EXCHANGE ACT.

         The purchase of Shares pursuant to the Offer will reduce the number of
Shares that might otherwise trade publicly and may reduce the number of holders
of Shares, which could adversely affect the liquidity and market value of the
remaining Shares held by Stockholders other than Computer Associates or Merger
Subsidiary. Computer Associates cannot predict whether the reduction in the
number of Shares that might otherwise trade publicly would have an adverse or
beneficial effect on the market price for or marketability of the Shares or
whether it would cause future market prices to be greater or less than the Offer
price.

         Depending upon the number of Shares purchased pursuant to the Offer,
the Shares may no longer meet the standards for continued inclusion on the
Nasdaq National Market. If, as a result of the purchase of Shares pursuant to
the Offer, the Shares no longer meet the standards for continued inclusion on
the Nasdaq National Market, the market for the Shares could be adversely
affected.

         The extent of the public market for the Shares and availability of
quotations therefor would, however, depend upon such factors as the number of
holders and/or the aggregate market value of the publicly-held Shares at such
time, the interest in maintaining a market in the Shares on the part of
securities firms, the possible termination of registration of the Shares under
the Exchange Act and other factors.

         The Shares are currently "margin securities" under the regulations of
the Board of Governors of the Federal Reserve System (the "Federal Reserve
Board"), which has the effect, among other things, of allowing brokers to extend
credit on the collateral of such Shares. Depending upon factors similar to those
described above regarding listing and market quotations, the Shares might no
longer constitute "margin securities" for the purposes of the Federal Reserve
Board's margin regulations and, therefore, could no longer be used as collateral
for loans made by brokers.

<PAGE>

         The Shares are currently registered under the Exchange Act. Such
registration may be terminated upon application of the Company to the Commission
if the Shares are not listed on a national securities exchange and there are
less than 300 holders of record. Termination of the registration of the Shares
under the Exchange Act would substantially reduce the information required to be
furnished by the Company to holders of Shares and to the Commission and would
make certain of the provisions of the Exchange Act, such as the short-swing
profit recovery provisions of Section 16(b), the requirement of furnishing a
proxy or information statement in connection with stockholder action and the
related requirement of an annual report to stockholders and the requirements of
Rule 13e-3 under the Exchange Act with respect to "going private" transactions,
no longer applicable to the Shares. Furthermore, "affiliates" of the Company and
persons holding "restricted securities" of the Company may be deprived of the
ability to dispose of such securities pursuant to Rule 144 or 144A promulgated
under the Securities Act of 1933, as amended. If registration of the Shares
under the Exchange Act were terminated, the Shares would no longer be "margin
securities" or eligible for Nasdaq reporting. Merger Subsidiary intends to seek
to cause the Company to terminate registration of the Shares under the Exchange
Act as soon after consummation of the Offer as the requirements for termination
of registration of the Shares are met.

13.  DIVIDENDS AND DISTRIBUTIONS.

         If on or after March 29, 1999, the Company should (notwithstanding the
fact that the following actions may be prohibited under the Merger Agreement)
(i) split, combine or otherwise change the Shares or its capitalization, (ii)
acquire or otherwise cause a reduction in the number of outstanding Shares or
(iii) issue or sell any additional Shares (other than Shares issued pursuant to
and in accordance with the terms in effect on March 29, 1999 of employee stock
options outstanding prior to such date and Convertible Securities outstanding
prior to such date), shares of any other class or series of capital stock, other
voting securities or any securities convertible into, or options, rights, or
warrants, conditional or otherwise, to acquire, any of the foregoing, then,
without prejudice to Merger Subsidiary's rights under Section 15, Merger
Subsidiary may, in its sole discretion, make such adjustments in the purchase
price and other terms of the Offer as it deems appropriate including the number
or type of securities to be purchased.

         If, on or after March 29, 1999, the Company should (notwithstanding the
fact that the following actions are prohibited under the Merger Agreement)
declare or pay any dividend on the Shares or any distribution with respect to
the Shares (including the issuance of additional Shares or other securities or
rights to purchase of any securities) that is payable or distributable to
Stockholders of record on a date prior to the transfer to the name of Merger
Subsidiary or its nominee or transferee on the Company's stock transfer records
of the Shares purchased pursuant to the Offer, then, without prejudice to Merger
Subsidiary's rights under Section 15, (i) the purchase price per Share payable
by Merger Subsidiary pursuant to the Offer may be reduced to the extent of any
such cash dividend or distribution and (ii) the whole of any such non-cash
dividend or distribution to be received by the tendering Stockholders will (a)
be received and held by the tendering Stockholders for the account of Merger
Subsidiary and will be required to be promptly remitted and transferred by each
tendering Stockholder to the Depositary for the account of Merger Subsidiary,
accompanied by appropriate documentation of transfer, or (b) at the direction of
Merger Subsidiary, be exercised for the benefit of Merger Subsidiary, in which
case the proceeds of such exercise will promptly be remitted to Merger
Subsidiary. Pending such remittance and subject to 

<PAGE>

applicable law, Merger Subsidiary will be entitled to all rights and privileges
as owner of any such non-cash dividend or distribution or proceeds thereof and
may withhold the entire purchase price or deduct from the purchase price the
amount or value thereof, as determined by Merger Subsidiary in its sole
discretion.

14.  EXTENSION OF TENDER PERIOD; TERMINATION; AMENDMENT.

         Merger Subsidiary reserves the right, at any time or from time to time,
in its sole discretion, (i) to extend the period of time during which the Offer
is open if, at the scheduled expiration date of the Offer or any extension
thereof, any of the conditions to the Offer shall not have been satisfied, until
such time as such conditions are satisfied or waived, and for a further period
of time as described below in this paragraph, in any case by giving oral or
written notice of such extension to the Depositary and by making a public
announcement of such extension or (ii) except to the extent otherwise provided
in the Merger Agreement, to amend the Offer in any respect by making a public
announcement of such amendment. There can be no assurance that Merger Subsidiary
will exercise its right to extend or amend the Offer. Subject to the terms of
the Offer and the satisfaction (or waiver to the extent permitted by the Merger
Agreement) of the conditions to the Offer, Merger Subsidiary shall accept for
payment all Shares validly tendered and not withdrawn pursuant to the Offer as
soon as practicable after the expiration of the Offer and shall pay for all such
Shares promptly after acceptance; PROVIDED, that Merger Subsidiary may extend
the Offer for a period of time of not more than 20 business days to meet the
objective (which is not a condition to the Offer) that there shall be validly
tendered prior to the Expiration Date (as so extended) and not withdrawn a
number of Shares, which, together with Shares then owned by Computer Associates
and Merger Subsidiary, represents at least 90% of the Fully Diluted Shares.
Under certain circumstances Merger Subsidiary may be required under the Merger
Agreement to extend the Offer. See Section 11 for a description of such
provisions of the Merger Agreement.

         If Merger Subsidiary shall decide, in its sole discretion, subject to
the terms of the Merger Agreement, to increase the consideration to be paid for
Shares pursuant to the Offer and the Offer is scheduled to expire at any time
before the expiration of a period of 10 business days from, and including, the
date that notice of such increase is first published, sent or given in the
manner specified below, the Offer will be extended until the expiration of such
period of 10 business days. If Merger Subsidiary makes a material change in the
terms of the Offer (other than a change in price or percentage of securities
sought) or in the information concerning the Offer, or waives a material
condition of the Offer, Merger Subsidiary will extend the Offer, if required by
applicable law, for a period sufficient to allow stockholders to consider the
amended terms of the Offer.

         Merger Subsidiary also reserves the right, in its sole discretion,
subject to the terms of the Merger Agreement, in the event any of the conditions
specified in Section 15 shall not have been satisfied and so long as Shares have
not theretofore been accepted for payment, to delay (except as otherwise
required by applicable law and the rules of the Commission including Rule 14e-1)
acceptance for payment of or payment for Shares or to terminate the Offer and
not accept for payment or pay for Shares.

         If Merger Subsidiary extends the period of time during which the Offer
is open, is delayed in accepting for payment or paying for Shares or is unable
to accept for payment or pay for Shares 

<PAGE>

pursuant to the Offer for any reason, then, without prejudice to Merger
Subsidiary's rights under the Offer, the Depositary may, on behalf of Merger
Subsidiary, retain all Shares tendered, and such Shares may not be withdrawn
except as otherwise provided in Section 4. The reservation by Merger Subsidiary
of the right to delay acceptance for payment of or payment for Shares is subject
to applicable law, which requires that Merger Subsidiary pay the consideration
offered or return the Shares deposited by or on behalf of Stockholders promptly
after the termination or withdrawal of the Offer.

         Any extension, termination or amendment of the Offer will be followed
as promptly as practicable by a public announcement thereof. In the case of an
extension of the Offer, Merger Subsidiary will make a public announcement of
such extension no later than 9:00 a.m., New York City time, on the next business
day after the previously scheduled Expiration Date. Without limiting the manner
in which Merger Subsidiary may choose to make any public announcement, Merger
Subsidiary will have no obligation (except as otherwise required by applicable
law) to publish, advertise or otherwise communicate any such public announcement
other than by making a release to the Dow Jones News Service.

15.  CERTAIN CONDITIONS OF THE OFFER.

         Notwithstanding any other provision of the Offer, Computer Associates
and Merger Subsidiary shall not be required to accept for payment or (subject to
any applicable rules and regulations of the Commission, including Rule 14e-1(c)
under the Exchange Act (relating to Merger Subsidiary's obligation to pay for or
return tendered shares after the termination or withdrawal of the Offer)) pay
for any Shares, if by the expiration of the Offer (as it may be extended in
accordance with the requirements of the Merger Agreement), the Minimum Condition
shall not have been satisfied, or at any time on or after March 29, 1999 and
prior to the acceptance for payment of Shares, any of the following conditions
exist:

                  (a) there shall be instituted or pending any action or
         proceeding by any Governmental Entity, (i) challenging or seeking to
         make illegal, to delay materially or otherwise directly or indirectly
         to restrain or prohibit the acquisition by Merger Subsidiary or any of
         its affiliates of Shares pursuant to the Stockholder Option Agreement,
         the making of the Offer, the acceptance for payment of or payment for
         some of or all the Shares by Computer Associates or Merger Subsidiary
         or the consummation by Computer Associates or Merger Subsidiary of the
         Merger, seeking to obtain material damages or otherwise directly or
         indirectly relating to the transactions contemplated by the Stockholder
         Option Agreement, the Merger Agreement, the Offer or the Merger, (ii)
         seeking to restrain or prohibit Computer Associates' or Merger
         Subsidiary's ownership or operation (or that of their respective
         subsidiaries or affiliates) of all or any material portion of the
         business or assets of the Company and its subsidiaries, taken as a
         whole, or of Computer Associates and its subsidiaries, taken as a
         whole, or to compel Computer Associates or any of its subsidiaries or
         affiliates to dispose of or hold separate all or any material portion
         of the business or assets of the Company and its subsidiaries, taken as
         a whole, or of Computer Associates and its subsidiaries, taken as a
         whole, (iii) seeking to impose material limitations on the ability of
         Computer Associates or any of its subsidiaries or affiliates
         effectively to exercise full rights of ownership of the Shares,
         including, without limitation, the right to vote any Shares 

<PAGE>

         acquired or owned by Computer Associates or any of its subsidiaries or
         affiliates on all matters properly presented to the Company's
         stockholders or (iv) seeking to require divestiture by Computer
         Associates or any of its subsidiaries or affiliates of any Shares; or

                  (b) there shall be any action taken, or any statute, rule,
         regulation, injunction, order or decree proposed, enacted, enforced,
         promulgated, issued or deemed applicable to the Merger Agreement, the
         Offer or the Merger, by any Governmental Entity or arbitrator (other
         than (1) any such matters actually required pursuant to Section
         7.1(e)(iv) or (vi) of the Merger Agreement as described in clauses (iv)
         or (vi) of pages 24-25 above or (2) the application of the waiting
         period provisions of the HSR Act to the Stockholder Option Agreement,
         the Merger Agreement, the Offer or the Merger) that, in the judgment of
         Computer Associates, is substantially likely, directly or indirectly,
         to result in any of the consequences referred to in clauses (i) through
         (iv) of paragraph (a) above subject as aforesaid; or

                  (c) there shall have occurred (i) any general suspension of
         trading in, or limitation on prices for, securities on any national
         securities exchange or in the over-the-counter market in the United
         States, (ii) a declaration of a banking moratorium or any suspension of
         payments in respect of banks in the United States, (iii) any material
         limitation (whether or not mandatory) by any Governmental Entity on the
         extension of credit by banks or other lending institutions, (iv) a
         commencement of a war or armed hostilities or other national or
         international calamity directly or indirectly involving the United
         States which would reasonably be expected to have a Material Adverse
         Effect or prevent (or materially delay) the consummation of the Offer
         or (v) in the case of any of the foregoing existing at the time of
         commencement of the Offer, a material acceleration or worsening
         thereof; or

                  (d) any Consent (other than the filing of a certificate of
         merger or approval by the stockholders of the Company of the Merger (if
         required by Delaware Law)) required to be filed, occurred or been
         obtained by the Company or any of its subsidiaries in connection with
         the execution and delivery of the Merger Agreement, the Offer and the
         consummation of the transactions contemplated by the Merger Agreement
         shall not have been filed, occurred or been obtained (other than any
         such Consents the failure to file, occur or obtain in the aggregate,
         could not reasonably be expected to (i) have a Material Adverse Effect
         or (ii) prevent or materially delay the consummation of the Offer or
         the Merger); or

                  (e) the Company shall have breached or failed to perform in
         any material respect any of its covenants, obligations or agreements
         under the Merger Agreement, or any of the representations and
         warranties of the Company set forth in the Merger Agreement that is
         qualified as to materiality shall not be true when made or any of the
         representations and warranties set forth in the Merger Agreement that
         is not so qualified shall not be true in any material respect when
         made; PROVIDED that this condition shall not be deemed to exist unless
         either (i) such breaches or failures to perform any covenant,
         obligation or agreements, and any breach of representation or warranty
         without regard to any materiality qualifier or threshold, individually
         or in the aggregate, could reasonably be expected to have a Material
         Adverse Effect (as defined below) or (ii) the breaches of certain
         representations and warranties regarding capital structure, taxes,
         brokers, fees and expenses, material contracts 

<PAGE>

         and the Rights Agreement in the Merger Agreement without regard to any
         materiality qualifier or threshold, and failure to perform or breach
         of any obligation, individually or in the aggregate, could reasonably
         be expected to result in a loss of damage of $22,500,000 or more; or

                  (f) the Merger Agreement shall have been terminated in
         accordance with its terms; or

                  (g) the Board of Directors of the Company (or any special
         committee thereof) shall have withdrawn or materially modified in a
         manner adverse to Computer Associates or Merger Subsidiary its approval
         or recommendation of the Offer, the Merger or the Merger Agreement or
         its approval of the entry by Computer Associates and Merger Subsidiary
         into the Stockholder Option Agreement; or

                  (h) the Company shall have entered into, or shall have 
         publicly announced its intention to enter into, an agreement or
         agreement in principle with respect to any Acquisition Proposal; or

                  (i) the applicable waiting period under the HSR Act shall not
         have expired or been terminated;

which, in the judgment of Computer Associates in any such case, and regardless
of the circumstances (including any action or omission by Computer Associates or
Merger Subsidiary) giving rise to any such condition, makes it inadvisable to
proceed with such acceptance for payment or payment. The term "Material Adverse
Effect" means a material adverse effect on the financial condition, business,
assets or results of operations of the Company and its subsidiaries taken as a
whole except that occurrences due solely to a disruption of the Company's or its
subsidiary's businesses solely as a result of the announcement of the execution
of this Agreement and the transactions proposed to be consummated by this
Agreement shall be excluded from consideration for purposes of the effect of any
action or inaction on the Company and its subsidiaries taken as a whole.

         The foregoing conditions are for the sole benefit of Computer
Associates and Merger Subsidiary and may be asserted by Computer Associates in
its discretion regardless of the circumstances (including any action or omission
by Computer Associates or Merger Subsidiary) giving rise to any such condition
or (other than the Minimum Condition) may, subject to the terms of the Merger
Agreement, be waived by Computer Associates and Merger Subsidiary in their
reasonable discretion in whole at any time or in part from time to time. The
failure by Computer Associates or Merger Subsidiary at any time to exercise its
rights under any of the foregoing conditions shall not be deemed a waiver of any
such right; the waiver of any such right with respect to particular facts and
circumstances shall not be deemed a waiver with respect to any other facts and
circumstances, and each such right shall be deemed an ongoing right which may be
asserted at any time or from time to time.

         Notwithstanding anything to the contrary set forth in the Offer to
Purchase, in response to any condition to the Offer not being satisfied, Merger
Subsidiary may not upon expiration of the 

<PAGE>

Offer (and without extending the period of time for which the Offer is open)
delay acceptance for payment or payment for Shares until such time as such
condition is satisfied or waived; PROVIDED that, subject to the applicable
regulations of the Commission, Merger Subsidiary reserves the right (subject to
the terms of the Merger Agreement), at any time and from time to time, to delay
acceptance for payment of, or, regardless of whether such Shares were
theretofore accepted for payment, pay for, any Shares in order to comply with
applicable law.

16.  CERTAIN LEGAL MATTERS; REGULATORY APPROVALS.

         GENERAL. Except as set forth in this Section 16, based on its
examination of publicly available information filed by the Company with the
Commission and other publicly available information concerning the Company,
Merger Subsidiary is not aware of any license or regulatory permit that appears
to be material to the Company's business that might be adversely affected by
Merger Subsidiary's acquisition of Shares as contemplated herein or of any
approval or other action by any government or governmental authority or agency,
domestic or foreign, that would be required for the acquisition or ownership of
Shares by Merger Subsidiary or Computer Associates as contemplated herein.
Should any such approval or other action be required, it is currently
contemplated that, except as described below under "State Takeover Statutes",
such approval or other action will be sought. Except as described under
"Antitrust", however, there is no current intent to delay the purchase of Shares
tendered pursuant to the Offer pending the outcome of any such matter. There can
be no assurance that any such approval or other action, if needed, would be
obtained or would be obtained without substantial conditions or that if such
approvals were not obtained or such other actions were not taken adverse
consequences might not result to the Company's business or certain parts of the
Company's business might not have to be disposed of, any of which could cause
Merger Subsidiary to elect to terminate the Offer without the purchase of Shares
thereunder. Merger Subsidiary's obligation under the Offer to accept for payment
and pay for Shares is subject to certain conditions. See Section 15.

         STATE TAKEOVER STATUTES. A number of states have adopted laws which, to
varying degrees, seek to regulate attempts to acquire corporations that are
incorporated in, or have substantial connections with, the state. The Company,
directly or through subsidiaries, conducts business in a number of states
throughout the United States, some of which have enacted such laws. Based on
publicly available information concerning the Company, Computer Associates does
not believe that any of these laws will, by their terms, apply to the Offer or
the Merger.

         In addition, the constitutional validity of state statutes regulating
acquisition attempts has been the subject of considerable litigation. In its
1982 decision in EDGAR V. MITE CORP., the Supreme Court of the United States
invalidated an Illinois law that, among other things, gave Illinois officials
authority to block a tender offer for any corporation having certain defined
connections with the state. In 1987, however, the Supreme Court upheld an
Indiana law that prevented acquirors of a controlling stake in certain Indiana
corporations from voting the acquired shares until the other stockholders had
approved the acquisition. The Court distinguished between state statutes that
affect acquisitions of entities incorporated outside the state and those that
address the internal governance, including the scope and exercise of stockholder
voting rights, of in-state corporations. While the lower federal courts have
relied on a similar distinction in subsequent cases, the precise extent to which
an individual state may regulate acquisitions of out-of-state corporations
remains unclear.

<PAGE>

         If any government official or third party should seek to apply any
state takeover law to the Offer or the Merger, Computer Associates will take
such action as then appears desirable, which action may include challenging the
applicability or validity of such statute in appropriate court proceedings. In
the event it is asserted that one or more state takeover statutes is applicable
to the Offer or the Merger and an appropriate court does not determine that it
is inapplicable or invalid as applied to the Offer or the Merger, Computer
Associates or Merger Subsidiary might be required to file certain information
with, or to receive approvals from, the relevant state authorities or holders of
Shares, and Merger Subsidiary might be unable to accept for payment or pay for
Shares tendered pursuant to the Offer, or be delayed in continuing or
consummating the Offer or the Merger. In such case, Merger Subsidiary may not be
obligated to accept for payment or pay for any tendered Shares. See Section 15.

         ANTITRUST. Under the HSR Act and the rules that have been promulgated
thereunder by the Federal Trade Commission (the "FTC"), certain acquisition
transactions may not be consummated unless certain information has been
furnished to the Antitrust Division of the Department of Justice (the "Antitrust
Division") and the FTC and certain waiting period requirements have been
satisfied. The purchase of Shares pursuant to the Offer is subject to such
requirements.

         Computer Associates filed a Notification and Report Form with respect
to the Offer with the Antitrust Division and the FTC on March 31, 1999. The
Company expects to file such Notification and Report Form on or about April 2,
1999. The waiting period applicable to the purchase of Shares pursuant to the
Offer is scheduled to expire at 11:59 P.M., New York City time, on Thursday,
April 15, 1999. However, prior to such time, the Antitrust Division or the FTC
may extend the waiting period by requesting additional information or
documentary material relevant to the Offer from Computer Associates. If such a
request is made, the waiting period will be extended until 11:59 P.M., New York
City time, on the tenth day after substantial compliance by Computer Associates
with such request. Thereafter, such waiting period can be extended only by court
order.

         A request has been made for early termination of the waiting period
applicable to the Offer. There can be no assurance, however, that the 15-day HSR
waiting period will be terminated early. Shares will not be accepted for payment
or paid for pursuant to the Offer until the expiration or earlier termination of
the applicable waiting period under the HSR Act. See Section 15. Any extension
of the waiting period will not give rise to any withdrawal rights not otherwise
provided for by applicable law. See Section 4.

         The provisions of the HSR Act would similarly apply to any purchase of
Shares pursuant to the Stockholder Option Agreement (other than purchases
effected through a tender pursuant to the Offer), except that the initial
waiting period would expire 30 days following the filing of HSR Act Notification
Forms by Computer Associates and the Company and a request for additional
information or material from Computer Associates or the Company during the
initial 30-day waiting period would extend the waiting period until 11:59 p.m.
New York City time on the 20th day after the date of substantial compliance by
the Buyer and the Company with such request. Computer Associates filed an HSR
Notification Form with respect to the Stockholder Option Agreement on March 31,
1999. The Company expects to file such Notification Forms on or about April 2,
1999. If, as is expected, the purchase of Shares permitted by the Stockholder
Option Agreement is effected 

<PAGE>

through a tender of such Shares pursuant to the Offer, the HSR requirements
applicable to the Offer described in the prior paragraph would apply rather than
the requirements described in this paragraph.

         The Merger would not require an additional filing under the HSR Act if
Computer Associates owns 50% or more of the outstanding Shares at the time of
the Merger or if the Merger occurs within one year after the HSR Act waiting
period applicable to the Offer expires or is terminated.

         The Antitrust Division and the FTC frequently scrutinize the legality
under the antitrust laws of transactions such as the acquisition of Shares by
Merger Subsidiary pursuant to the Offer. At any time before or after the
consummation of any such transactions, the Antitrust Division or the FTC could
take such action under the antitrust laws as it deems necessary or desirable in
the public interest, including seeking to enjoin the purchase of Shares pursuant
to the Offer or seeking divestiture of the Shares so acquired or divestiture of
substantial assets of Computer Associates or the Company. Private parties
(including individual States) may also bring legal actions under the antitrust
laws. Computer Associates does not believe that the consummation of the Offer
will result in a violation of any applicable antitrust laws. However, there can
be no assurance that a challenge to the Offer on antitrust grounds will not be
made, or if such a challenge is made, what the result will be. See Section 15
for certain conditions to the Offer, including conditions with respect to
litigation and certain governmental actions and see Section 11 for a description
of certain provisions of the Merger Agreement with respect to potential
antitrust litigation and related matters and the extension of the Offer under
such circumstances.

         FOREIGN APPROVALS. The Company conducts business in foreign countries
and jurisdictions. The laws of certain of those foreign countries and
jurisdictions may require the filing of information with, or the obtaining of
the approval of, governmental authorities in such countries and jurisdictions in
connection with the acquisition of Shares pursuant to the Offer. There can be no
assurance that any such approval can be obtained, that Computer Associates will
be able to cause the Company or its subsidiaries to satisfy or comply with such
laws or that compliance or non-compliance will not have adverse consequences for
Computer Associates or the Company or any subsidiary of either of them. The
Offer is subject to certain conditions, including conditions relating to the
legal matters referred to in this Section 16. See Section 15.

         MARGIN CREDIT REGULATIONS. Federal Reserve Board Regulations T, U and X
(the "Margin Credit Regulations") restrict the extension or maintenance of
credit for the purpose of buying or maintaining margin stock, if the credit is
secured directly or indirectly thereby. The borrowings under the Credit
Agreements will not be directly secured by a pledge of the Shares. In addition,
Computer Associates and Merger Subsidiary believe that such borrowings will not
be "indirectly secured" within the meaning of the Margin Credit Regulations, as
interpreted. Accordingly, Computer Associates and Merger Subsidiary believe that
the Margin Credit Regulations are not applicable to the borrowings under the
Credit Facility.

17.  FEES AND EXPENSES.

         Merger Subsidiary has retained MacKenzie Partners, Inc. to act as the
Information Agent and 

<PAGE>

American Stock Transfer & Trust Company to act as the Depositary in connection
with the Offer. The Information Agent may contact holders of Shares by mail,
telephone, telex, telegraph and personal interviews and may request brokers,
dealers and other nominee stockholders to forward materials relating to the
Offer to beneficial owners. The Information Agent and the Depositary each will
receive reasonable and customary compensation for their respective services,
will be reimbursed for certain reasonable out-of-pocket expenses and will be
indemnified against certain liabilities in connection therewith, including
certain liabilities under the federal securities laws.

         Merger Subsidiary will not pay any fees or commissions to any broker or
dealer or any other person (other than the Information Agent and the Depositary)
for soliciting tenders of Shares pursuant to the Offer. Brokers, dealers,
commercial banks and trust companies will, upon request, be reimbursed by Merger
Subsidiary for reasonable and necessary costs and expenses incurred by them in
forwarding materials to their customers.

18.  MISCELLANEOUS.

         The Offer is not being made to, nor will tenders be accepted from or on
behalf of, holders of Shares in any jurisdiction in which the making of the
Offer or acceptance thereof would not be in compliance with the laws of such
jurisdiction. However, Merger Subsidiary may, in its discretion, take such
action as it may deem necessary to make the Offer in any such jurisdiction and
extend the Offer to holders of Shares in such jurisdiction.

         NO PERSON HAS BEEN AUTHORIZED TO GIVE ANY INFORMATION OR MAKE ANY
REPRESENTATION ON BEHALF OF MERGER SUBSIDIARY NOT CONTAINED IN THIS OFFER TO
PURCHASE OR IN THE LETTER OF TRANSMITTAL AND, IF GIVEN OR MADE, SUCH INFORMATION
OR REPRESENTATION MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED.

         Merger Subsidiary has filed with the Commission a Tender Offer
Statement on Schedule 14D-l, together with exhibits, pursuant to Rule 14d-3 of
the General Rules and Regulations under the Exchange Act, furnishing certain
additional information with respect to the Offer. The Schedule 14D-l and any
amendments thereto, including exhibits, may be examined and copies may be
obtained from the offices of the Commission in the manner set forth with respect
to the Company in Section 7 of this Offer to Purchase (except that such
information will not be available at the regional offices of the Commission).


                                             HardMetal, Inc.

<PAGE>

                                                                      SCHEDULE I


               INFORMATION CONCERNING THE DIRECTORS AND EXECUTIVE
              OFFICERS OF COMPUTER ASSOCIATES AND MERGER SUBSIDIARY



1. DIRECTORS AND EXECUTIVE OFFICERS OF COMPUTER ASSOCIATES. The following table
sets forth the name, age, business address and present principal occupation or
employment, and material occupations, positions, offices or employments for the
past five years of each director and executive officer of Computer Associates.
Each such person is a citizen of the United States of America, except for Willem
F.P. de Vogel and Roel Pieper who are citizens of The Netherlands. Unless
otherwise indicated below, the business address of each person is c/o Computer
Associates, One Computer Associates Plaza, Islandia, New York 11788.
Unless otherwise indicated, each occupation set forth opposite an individual's
name refers to employment with Computer Associates.

                         DIRECTORS (INCLUDING EXECUTIVE
                           OFFICERS WHO ARE DIRECTORS)

<TABLE>
<CAPTION>

                                                                        Present Principal Occupation
              Name and                                               or Employment; Material Positions
          Business Address               Age                            Held During Past Five Years
          ----------------               ---                            ---------------------------
<S>                                     <C>             <C>
Russell M. Artzt.......................  52              Director of Computer Associates since 1980. Executive Vice
                                                         President-Research and Development since April 1987 and the
                                                         Senior Development Officer since 1976.

Willem F.P. de Vogel...................  48              Director of Computer Associates since 1991. President of
Three Cities Research, Inc.                              Three Cities Research, Inc., a private investment
135 East 57th Street                                     management firm  in  New  York  City, since 1981. From
New York, New York  10022                                August 1981 to August 1990, Mr. de Vogel served as a
                                                         director of Computer Associates. He is also a director
                                                         of Morton Industrial Group.

</TABLE>


                                      I-1
<PAGE>

<TABLE>
<CAPTION>

                                                                        Present Principal Occupation
              Name and                                               or Employment; Material Positions
          Business Address               Age                            Held During Past Five Years
          ----------------               ---                            ---------------------------
<S>                                     <C>             <C>
Irving Goldstein.......................  60              Director of Computer Associates since 1990. Former Chief    
INTELSAT                                                 Executive Officer Director General and Chief Executive      
3400 International Drive, N.W.                           Officer of INTELSAT, of COMSAT (formerly an international   
Washington, D.C.  20008                                  satellite telecommunications company known as Communications
                                                         from February 1992 to October 1998. He was Chairman and     
                                                         Satellite Corporation) from October 1985 to February 1992   
                                                         and President from May 1983 to October 1985, and was a      
                                                         director from May 1983 to February 1992.                    

Richard A. Grasso......................  52              Director of Computer Associates since January 1994. and    
New York Stock Exchange                                  President and Chief Chairman and Chief Executive Officer of
11 Wall Street                                           the New York Operating Officer of Stock Exchange since June
New York, New York  10005                                1995. He was Executive Vice the New York Stock Chairman of 
                                                         the New York Stock Exchange from 1991 to 1995 Exchange from
                                                         1988 to 1995.                                              

Shirley Strum Kenny....................  64              Director of Computer Associates since July 1994. President
President's Office                                       of State University of New York at Stony Brook since 1994.
State University of                                      She was President of Queens College of the City University
New York at Stony Brook                                  of New York from 1989 to 1994. She is also a director of  
Stony Brook, New York  11794                             Toys "R" Us, Inc.                                         

Sanjay Kumar...........................  36              Director of Computer Associates since January 1994.         
                                                         President and Chief Operating Officer since January 1994. He
                                                         was Senior Vice President Planning from April 1989 to       
                                                         December 1992 and Executive Vice President Operations from  
                                                         January 1993 to December 1993.                              

Roel Pieper............................  43              Director of Computer Associates since March 1999. Executive 
                                                         Vice President of Royal Philips Electronics, an electronics 
                                                         company, since 1998. From 1997 to 1998, he was Senior Vice  
                                                         President, Worldwide Sales and Marketing, of Compaq Computer
                                                         Corporation. He was President and Chief Executive Officer of
                                                         Tandem Computers from 1996 until its merger with Compaq     
                                                         Computer Corporation in 1997. From 1993 to 1996, he was     
                                                         President and Chief Executive Officer of AT&T's Unix System 
                                                         Laboratories.                                               

</TABLE>


                                      I-2
<PAGE>

<TABLE>
<CAPTION>

                                                                        Present Principal Occupation
              Name and                                               or Employment; Material Positions
          Business Address               Age                            Held During Past Five Years
          ----------------               ---                            ---------------------------
<S>                                     <C>             <C>
Charles B. Wang........................  54              Director of Computer Associates since 1976. Chief Executive
                                                         Officer since 1976 and Chairman of the Board since April   
                                                         1980. He is also a director of Symbol Technologies, Inc.   

</TABLE>


                                      I-3
<PAGE>

                           EXECUTIVE OFFICERS WHO ARE
                                  NOT DIRECTORS

<TABLE>
<CAPTION>

                                                                        Present Principal Occupation
              Name and                                               or Employment; Material Positions
          Business Address               Age                            Held During Past Five Years
          ----------------               ---                            ---------------------------
<S>                                     <C>             <C>
Michael A. McElroy.....................  54              Vice President and Secretary. He was elected Secretary    
                                                         effective January 1997 and has been a Vice President since
                                                         1989.                                                     

Charles P. McWade......................  54              Senior Vice President Business Development since April 1998.
                                                         He was Senior Vice President Finance from April 1990 to     
                                                         April 1998. He was Senior Vice President and Treasurer from 
                                                         April 1988 to March 1994.                                   
                                                         

Lisa Savino............................  33              Vice President and Treasurer since November 1997. She was   
                                                         Vice President and Assistant Treasurer April 1996 to        
                                                         November 1997. She was Assistant Vice President and         
                                                         Assistant Treasurer from April 1995 to April 1996. From 1990
                                                         to March 1995, she held various positions at Computer       
                                                         Associates.                                                 

Ira H. Zar.............................  37              Senior Vice President Finance and Chief Financial Officer  
                                                         since July 1998. He was Senior Vice President-Finance of   
                                                         Computer Associates since November 1997. He was Senior Vice
                                                         President and Treasurer of Computer Associates from April  
                                                         1994 to October 1997 and Vice President Finance from April 
                                                         1990 to April 1994.                                        

</TABLE>


                                      I-4
<PAGE>

2. DIRECTORS AND EXECUTIVE OFFICERS OF MERGER SUBSIDIARY. The following table
sets forth the name and position with Merger Subsidiary of each director and
executive officer of Merger Subsidiary and his age, present principal occupation
or employment, and material occupations, positions, offices or employments for
the past five years.

<TABLE>
<CAPTION>

       Name                       Age                              Position With Merger Subsidiary
       ----                       ---                              -------------------------------
<S>                              <C>                <C>
Michael A. McElroy................54                 Director, Vice President and Assistant Secretary of Merger
                                                     Subsidiary since its incorporation on March 25, 1999. Vice
                                                     President of Computer Associates since April 1989 and     
                                                     Secretary of Computer Associates since January 1997.      

Charles P. McWade.................54                 Vice President of Merger Subsidiary since its incorporation
                                                     on March 25, 1999. Senior Vice President Business          
                                                     Development of Computer Associates since April 1998. He was
                                                     Senior Vice President Finance of Computer Associates from  
                                                     April 1990 to April 1998. He was Senior Vice President and 
                                                     Treasurer of Computer Associates from April 1988 to March  
                                                     1994.                                                       

Steven M. Woghin..................52                 Director, Vice President, Secretary and Treasurer of Merger 
                                                     Subsidiary since its incorporation on March 25, 1999. Senior
                                                     Vice President and General Counsel of Computer Associates   
                                                     since April 1995. He was Vice President, Legal of Computer  
                                                     Associates from April 1992 to March 1995. Prior to 1990     
                                                     through April 1992, he was a partner in the law firm of     
                                                     Arter & Hadden.                                             

Ira H. Zar........................37                 Director, President and Assistant Treasurer of Merger
                                                     Subsidiary since its incorporation on March 25, 1999.

</TABLE>

         None of the executive officers and directors of Computer Associates or
Merger Subsidiary currently is a director of, or holds any position with, the
Company or any of its subsidiaries. To the knowledge of Computer Associates and
Merger Subsidiary, none of Computer Associates' or Merger Subsidiary's
directors, executive officers, affiliates or associates beneficially owns any
equity securities, or rights to acquire any equity securities, of the Company
and none has been involved in any transactions with the Company or any of its
directors, executive officers, affiliates or associates which are required to be
disclosed pursuant to the rules and regulations of the Commission.


                                      I-5
<PAGE>

         Facsimile copies of the Letter of Transmittal will be accepted. The
Letter of Transmittal, certificates for Shares and any other required documents
should be sent to the Depositary at one of the addresses set forth below:

<TABLE>

                        THE DEPOSITARY FOR THE OFFER IS:

                     AMERICAN STOCK TRANSFER & TRUST COMPANY
<S>                                 <C>                              <C>
               BY MAIL:               BY FACSIMILE TRANSMISSION:      BY HAND/OVERNIGHT DELIVERY:
      40 Wall Street, 46th Floor     (Eligible Institutions Only)     40 Wall Street, 46th Floor
          New York, NY 10005                (718) 234-5001                New York, NY 10005
      (Attention: Reorganization                                      (Attention: Reorganization
             Department)                                                      Department)
                                        CONFIRM BY TELEPHONE:
                                            (718) 921-8200

                                        FOR INFORMATION CALL:
                                            (718) 921-8200

</TABLE>

         Questions or requests for assistance or additional copies of this Offer
to Purchase and the Letter of Transmittal may be directed to the Information
Agent at the address and telephone numbers set forth below. Stockholders may
also contact their broker, dealer, commercial bank or trust company for
assistance concerning the Offer.



                     THE INFORMATION AGENT FOR THE OFFER IS:

                            MacKenzie Partners, Inc.
                                156 Fifth Avenue
                            New York, New York 10010
                          (212) 929-5500 (Call Collect)
                                       or
                          CALL TOLL FREE (800) 322-2885


<PAGE>
                                                                EXHIBIT 99(A)(2)
 
                               LETTER OF TRANSMITTAL
 
                        TO TENDER SHARES OF COMMON STOCK
                       (INCLUDING THE ASSOCIATED RIGHTS)
 
                                       OF
 
                    PLATINUM TECHNOLOGY INTERNATIONAL, INC.
 
                       PURSUANT TO THE OFFER TO PURCHASE
                              DATED APRIL 2, 1999
                                       BY
                                HARDMETAL, INC.
                          a wholly owned subsidiary of
                    COMPUTER ASSOCIATES INTERNATIONAL, INC.
- --------------------------------------------------------------------------------
THE OFFER AND WITHDRAWAL RIGHTS EXPIRE AT 12:00 MIDNIGHT, NEW YORK CITY TIME, ON
             THURSDAY, APRIL 29, 1999, UNLESS THE OFFER IS EXTENDED.
   ---------------------------------------------------------------------------
 
                        THE DEPOSITARY FOR THE OFFER IS:
                     AMERICAN STOCK TRANSFER & TRUST COMPANY
 
<TABLE>
<S>                              <C>                                 <C>
           BY MAIL:                  BY FACSIMILE TRANSMISSION:        BY HAND/OVERNIGHT DELIVERY:
 40 Wall Street, 46(th) Floor       (Eligible Institutions Only)      40 Wall Street, 46(th) Floor
      New York, NY 10005                   (718) 234-5001                  New York, NY 10005
          (Attention:                  CONFIRM BY TELEPHONE:                   (Attention:
  Reorganization Department)               (718) 921-8200              Reorganization Department)
                                       FOR INFORMATION CALL:
                                           (718) 921-8200
</TABLE>
 
    DELIVERY OF THIS INSTRUMENT TO AN ADDRESS OTHER THAN AS SET FORTH ABOVE OR
TRANSMISSION OF INSTRUCTIONS VIA FACSIMILE TRANSMISSION OTHER THAN AS SET FORTH
ABOVE WILL NOT CONSTITUTE A VALID DELIVERY.
 
    THE INSTRUCTIONS ACCOMPANYING THIS LETTER OF TRANSMITTAL SHOULD BE READ
CAREFULLY BEFORE THIS LETTER OF TRANSMITTAL IS COMPLETED.
 
    This Letter of Transmittal is to be used either if certificates representing
Shares (defined below) are to be forwarded with this Letter of Transmittal or,
unless an Agent's Message (defined in Section 2 of the Offer to Purchase) is
utilized, if delivery of Shares is to be made by book-entry transfer to the
Depositary's account at The Depository Trust Company ("DTC" or the "Book-Entry
Transfer Facility") pursuant to the procedure set forth in Section 3 of the
Offer to Purchase.
 
    Stockholders who cannot deliver certificates for their Shares or who cannot
deliver confirmation of the book-entry transfer of their Shares into the
Depositary's account at the Book-Entry Transfer Facility (a "Book-Entry
Confirmation") and all other documents required by this Letter of Transmittal to
the Depositary by the Expiration Date (defined in Section 1 of the Offer to
Purchase) must tender their Shares pursuant to the guaranteed delivery procedure
set forth in Section 3 of the Offer to Purchase. See Instruction 2. Delivery of
documents to the Book-Entry Transfer Facility does not constitute delivery to
the Depositary.
<PAGE>
 
<TABLE>
<CAPTION>
 ----------------------------------------------------------------------------------------------------
                                    DESCRIPTION OF SHARES TENDERED
 ----------------------------------------------------------------------------------------------------
   NAME(S) AND ADDRESS(ES) OF REGISTERED HOLDER(S)
    (PLEASE FILL IN, IF BLANK, EXACTLY AS NAME(S)
                       APPEAR(S)                                       SHARES TENDERED
                  ON CERTIFICATE(S))                     (ATTACH ADDITIONAL SIGNED LIST IF NECESSARY)
<S>                                                     <C>             <C>             <C>
- ------------------------------------------------------------------------------------------------------
                                                         CERTIFICATE     TOTAL NUMBER    TOTAL NUMBER
                                                         NUMBER(S)(1)         OF          OF SHARES
                                                                            SHARES       TENDERED(2)
                                                                        REPRESENTED BY
                                                                        CERTIFICATE(S)(1)
- ------------------------------------------------------------------------------------------------------
 
                                                        ----------------------------------------------
 
                                                        ----------------------------------------------
 
                                                        ----------------------------------------------
                                                         TOTAL SHARES
 
- ------------------------------------------------------------------------------------------------------
 
  (1)  NEED NOT BE COMPLETED BY STOCKHOLDERS TENDERING BY BOOK-ENTRY TRANSFER.
  (2)  UNLESS OTHERWISE INDICATED, IT WILL BE ASSUMED THAT ALL SHARES DESCRIBED ABOVE ARE BEING
       TENDERED. SEE INSTRUCTION 4.
 
- ------------------------------------------------------------------------------------------------------
</TABLE>
 
                    NOTE: SIGNATURES MUST BE PROVIDED BELOW
 
                PLEASE READ ACCOMPANYING INSTRUCTIONS CAREFULLY
 
/ /  CHECK HERE IF TENDERED SHARES ARE BEING DELIVERED BY BOOK-ENTRY TRANSFER TO
    THE DEPOSITARY'S ACCOUNT AT THE BOOK-ENTRY TRANSFER FACILITY AND COMPLETE
    THE FOLLOWING:
 
    Name of Tendering Institution ______________________________________________
 
    TC Account Number __________________________________________________________
 
    Transaction Code Number ____________________________________________________
 
/ /  CHECK HERE IF TENDERED SHARES ARE BEING DELIVERED PURSUANT TO A NOTICE OF
    GUARANTEED DELIVERY PREVIOUSLY SENT TO THE DEPOSITARY AND COMPLETE THE
    FOLLOWING:
 
    Name(s) of Registered Owner(s): ____________________________________________
 
    Date of Execution of Notice of Guaranteed Delivery: ________________________
 
    Name of Institution that Guaranteed Delivery: ______________________________
 
    If delivery is by book-entry transfer, give the following: _________________
 
        DTC Account Number _____________________________________________________
 
        Transaction Code Number ________________________________________________
- --------------------------------------------------------------------------------
 
                                       2
<PAGE>
Ladies and Gentlemen:
 
    The undersigned hereby tenders to HardMetal, Inc., a Delaware corporation
("Merger Subsidiary") and a wholly owned subsidiary of Computer Associates
International, Inc., a Delaware corporation ("Computer Associates"), the above
described shares of Common Stock, par value $.001 per share, of PLATINUM
TECHNOLOGY International, INC., a Delaware corporation (the "Company"),
including the associated Class II Series A Junior Participating Preferred Share
Purchase Rights (the "Rights") issued pursuant to the Rights Agreement, dated as
of December 21, 1995, as amended, between the Company and Harris Trust and
Savings Bank, as Rights Agent (the shares and the Rights collectively referred
to as the "Shares") pursuant to Merger Subsidiary's offer to purchase all
outstanding Shares at a price of $29.25 per Share, net to the seller in cash,
upon the terms and subject to the conditions set forth in the Offer to Purchase
dated April 2, 1999 (the "Offer to Purchase"), receipt of which is hereby
acknowledged, and in this Letter of Transmittal (which, together with any
amendments or supplements thereto or hereto, collectively constitute the
"Offer"). Merger Subsidiary reserves the right to transfer or assign, in whole
or from time to time in part, to one or more of Computer Associates or any of
its wholly-owned subsidiaries the right to purchase Shares tendered pursuant to
the Offer.
 
    Subject to and effective upon acceptance for payment of the Shares tendered
herewith in accordance with the terms and subject to the conditions of the
Offer, the undersigned hereby sells, assigns, and transfers to, or upon the
order of, Merger Subsidiary all right, title and interest in and to all the
Shares that are being tendered hereby (and any and all other Shares or other
securities issued or issuable in respect thereof on or after March 29, 1999) and
irrevocably constitutes and appoints the Depositary the true and lawful agent
and attorney-in-fact of the undersigned with respect to such Shares (and all
such other Shares or securities), with full power of substitution (such power of
attorney being deemed to be an irrevocable power coupled with an interest), to
(a) deliver certificates for such Shares (and all such other Shares or
securities), or transfer ownership of such Shares (and all such other Shares or
securities) on the account books maintained by the Book-Entry Transfer Facility,
together, in either such case with all accompanying evidences of transfer and
authenticity, to or upon the order of Merger Subsidiary, (b) present such Shares
(and all such other Shares or securities) for transfer on the books of the
Company and (c) receive all benefits and otherwise exercise all rights of
beneficial ownership of such Shares (and all such other Shares or securities),
all in accordance with the terms of the Offer.
 
    If, on or after March 29, 1999, the Company should declare or pay any cash
or stock dividend or other distribution on or issue any rights with respect to
the Shares, payable or distributable to stockholders of record on a date before
the transfer to the name of Merger Subsidiary or its nominee or transferee on
the Company's stock transfer records of the Shares accepted for payment pursuant
to the Offer, then, subject to the provisions of the Offer to Purchase, (i) the
purchase price per Share payable by Merger Subsidiary pursuant to the Offer will
be reduced by the amount of any such cash dividend or cash distribution and (ii)
the whole of any such non-cash dividend, distribution or right will be received
and held by the tendering stockholder for the account of Merger Subsidiary and
shall be required to be promptly remitted and transferred by each tendering
stockholder to the Depositary for the account of Merger Subsidiary, accompanied
by appropriate documentation of transfer. Pending such remittance, Merger
Subsidiary will be entitled to all rights and privileges as owner of any such
non-cash dividend, distribution or right and may withhold the entire purchase
price or deduct from the purchase price the amount of value thereof, as
determined by Merger Subsidiary in its sole discretion.
 
                                       3
<PAGE>
    The undersigned hereby irrevocably appoints Mr. Ira H. Zar, Mr. Michael A.
McElroy and Mr. Steven M. Woghin, and each of them, and any other designees of
Merger Subsidiary as the attorneys and proxies of the undersigned, each with
full power of substitution, to exercise all voting and other rights of the
undersigned in such manner as each such attorney and proxy or its substitute
shall in its sole discretion deem proper with respect to, to execute any written
consent concerning any matter as each such attorney and proxy or its substitute
shall in its sole discretion deem proper with respect to, and to otherwise act
as such attorney and proxy or its substitute shall in its sole discretion deem
proper with respect to, all of the Shares tendered hereby which have been
accepted for payment by Merger Subsidiary prior to the time of any vote or other
action (and any and all other Shares or other securities issued or issuable in
respect thereof on or after March 29, 1999), at any meeting of stockholders of
the Company (whether annual or special and whether or not an adjourned meeting),
by written consent or otherwise. This proxy is irrevocable and is granted in
consideration of, and is effective upon, the acceptance for payment of such
Shares by Merger Subsidiary in accordance with the terms of the Offer. Such
acceptance for payment shall revoke any other proxy or written consent granted
by the undersigned at any time with respect to such Shares (and all such other
Shares or securities), and no subsequent proxies will be given or written
consents will be executed by the undersigned (and if given or executed, will not
be deemed to be effective). The undersigned acknowledges that in order for
Shares to be deemed validly tendered, immediately upon the acceptance for
payment of such Shares, Merger Subsidiary or Merger Subsidiary's designee must
be able to exercise full voting and other rights of a record and beneficial
holder with respect to such Shares.
 
    The undersigned hereby represents and warrants that the undersigned has full
power and authority to tender, sell, assign and transfer the Shares tendered
hereby (and any and all other Shares or other securities issued or issuable in
respect thereof on or after March 29, 1999), that the undersigned own(s) the
Shares tendered hereby within the meaning of Rule 14e-4 promulgated under the
Securities Exchange Act of 1934, as amended (the "Exchange Act"), that such
tender of Shares complies with Rule 14e-4 under the Exchange Act, and that when
the same are accepted for payment by Merger Subsidiary, Merger Subsidiary will
acquire good and unencumbered title thereto, free and clear of all liens,
restrictions, charges and encumbrances and not subject to any adverse claims.
The undersigned will, upon request, execute and deliver any additional documents
deemed by the Depositary or Merger Subsidiary to be necessary or desirable to
complete the sale, assignment and transfer of the Shares tendered hereby (and
all such other Shares or securities).
 
    All authority herein conferred or agreed to be conferred in this Letter of
Transmittal shall not be affected by, and shall survive, the death or incapacity
of the undersigned, and any obligation of the undersigned hereunder shall be
binding upon the heirs, personal representatives, successors, assigns,
administrators, trustees in bankruptcy, personal and legal representatives of
the undersigned. Except as stated in the Offer, this tender is irrevocable,
provided that Shares tendered pursuant to the Offer may be withdrawn at any time
prior to the Expiration Date or at any time on or after May 31, 1999, unless
theretofore accepted for payment.
 
    The undersigned understands that tenders of Shares pursuant to any one of
the procedures described in Section 3 of the Offer to Purchase and in the
instructions hereto will constitute a binding agreement between the undersigned
and Merger Subsidiary upon the terms and subject to the conditions of the Offer.
The undersigned recognizes that under certain circumstances set forth in the
Offer to Purchase, Merger Subsidiary may not be required to accept for payment
any Shares tendered hereby.
 
    Unless otherwise indicated under "Special Payment Instructions", please
issue the check for the purchase price of any Shares purchased, and/or return
any certificates for Shares not tendered or not accepted for payment, in the
name(s) of the registered holder(s) appearing under "Description of Shares
Tendered" (and, in the case of Shares tendered by book-entry transfer, by credit
to the account at the Book-Entry Transfer Facility). Similarly, unless otherwise
indicated under "Special Delivery Instructions", please mail the check for the
purchase price of any Shares purchased and any certificates for Shares not
tendered or not accepted for payment (and accompanying documents, as
appropriate) to the address(es) of the registered holder(s) appearing under
"Description of Shares Tendered" shown below the undersigned's signature(s). In
the event that both "Special Payment Instructions" and "Special Delivery
Instructions" are completed, please issue the check for the purchase price of
any Shares purchased and return any certificates for Shares not tendered or not
accepted for payment (and accompanying documents, as appropriate) in the name(s)
of, and mail said check and any certificates (and accompanying documents, as
appropriate) to, the person(s) so indicated. The undersigned recognizes that
Merger Subsidiary has no obligation, pursuant to the "Special Payment
Instructions", to transfer any Shares from the name of the registered holder(s)
thereof if Merger Subsidiary does not accept for payment any of the Shares so
tendered.
 
                                       4
<PAGE>
- ------------------------------------------------
                          SPECIAL PAYMENT INSTRUCTIONS
                        (SEE INSTRUCTIONS 1, 5, 6 AND 7)
 
      To be completed ONLY if the check for the purchase price of Shares
  purchased or certificates for Shares not tendered or not purchased are to be
  issued in the name of someone other than the undersigned.
 
  Issue check and/or certificates to:
 
  Name _______________________________________________________________________
                                 (PLEASE PRINT)
  Address ____________________________________________________________________
 
  ____________________________________________________________________________
                               (INCLUDE ZIP CODE)
 
   __________________________________________________________________________
                  (TAX IDENTIFICATION OR SOCIAL SECURITY NO.)
 
   ------------------------------------------------------------------
   ------------------------------------------------------------------
 
                         SPECIAL DELIVERY INSTRUCTIONS
                           (SEE INSTRUCTIONS 5 AND 7)
 
      To be completed ONLY if the check for the purchase price of Shares
  purchased or certificates for Shares not tendered or not purchased are to be
  mailed to someone other than the undersigned or to the undersigned at an
  address other than that shown above.
 
  Mail check and/or certificates to:
 
  Name _______________________________________________________________________
                                 (PLEASE PRINT)
 
  Address ____________________________________________________________________
 
  ____________________________________________________________________________
                               (INCLUDE ZIP CODE)
 
   -----------------------------------------------------------
 
                                       5
<PAGE>
                                   IMPORTANT
 
                                   SIGN HERE
                  (PLEASE COMPLETE SUBSTITUTE FORM W-9 BELOW)
 
________________________________________________________________________________
                      SIGNATURE(S) OF HOLDER(S) OF SHARES
 
________________________________________________________________________________
 
Dated:               , 1999
 
(Must be signed by registered holder(s) exactly as name(s) appear(s) on stock
certificate(s) or on a security position listing or by person(s) authorized to
become registered holder(s) by certificates and documents transmitted herewith.
If signature is by a trustee, executor, administrator, guardian,
attorney-in-fact, agent, officer of a corporation or other person acting in a
fiduciary or representative capacity, please provide the following information.
See Instruction 5.)
 
Name(s) ________________________________________________________________________
                                 (PLEASE PRINT)
 
________________________________________________________________________________
 
Capacity (full title) (See Instruction 5) ______________________________________
 
Address ________________________________________________________________________
 
________________________________________________________________________________
                                                              (INCLUDE ZIP CODE)
 
Area Code and Telephone No. ____________________________________________________
 
Tax Identification or Social Security No.: _____________________________________
 
                           GUARANTEE OF SIGNATURE(S)
                    (IF REQUIRED--SEE INSTRUCTIONS 1 AND 5)
 
Authorized Signature ___________________________________________________________
 
Name ___________________________________________________________________________
 
Name of Firm ___________________________________________________________________
 
Address ________________________________________________________________________
 
________________________________________________________________________________
                                                              (INCLUDE ZIP CODE)
 
Area Code and Telephone No. ____________________________________________________
 
Dated:               , 1999
 
                                       6
<PAGE>
                                  INSTRUCTIONS
             FORMING PART OF THE TERMS AND CONDITIONS OF THE OFFER
 
    1.  GUARANTEE OF SIGNATURES. Except as otherwise provided below, all
signatures on this Letter of Transmittal must be guaranteed by a bank, broker,
dealer, credit union, savings association or other entity that is a member of a
recognized Medallion Program approved by The Securities Transfer Association,
Inc. (an "Eligible Institution"). Signatures on this Letter of Transmittal need
not be guaranteed (a) if this Letter of Transmittal is signed by the registered
holder(s) of the Shares (which term, for purposes of this document, shall
include any participant in the Book-Entry Transfer Facility whose name appears
on a security position listing as the owner of Shares) tendered herewith and
such holder(s) have not completed the instruction entitled "Special Payment
Instructions" on this Letter of Transmittal or (b) if such Shares are tendered
for the account of an Eligible Institution. In all other cases, all signatures
on this Letter of Transmittal must be guaranteed by an Eligible Institution. See
Instruction 5.
 
    2.  DELIVERY OF LETTER OF TRANSMITTAL AND SHARES. This Letter of Transmittal
is to be used either if certificates are to be forwarded herewith or, unless an
Agent's Message is utilized, if delivery of Shares is to be made by book-entry
transfer pursuant to the procedure set forth in Section 3 of the Offer to
Purchase. Certificates for all physically delivered Shares, or a Book-Entry
Confirmation of all Shares delivered electronically, as the case may be, as well
as a properly completed and duly executed Letter of Transmittal (or facsimile
thereof) or, in connection with a book-entry transfer, an Agent's Message, and
any other documents required by this Letter of Transmittal, must be received by
the Depositary at one of its addresses set forth on the front page of this
Letter of Transmittal by the Expiration Date. If a stockholder's certificate for
Shares is not immediately available or time will not permit all required
documents to reach the Depositary by the Expiration Date or the procedure for
book-entry transfer cannot be completed on a timely basis, such stockholder's
Shares may nevertheless be tendered pursuant to the guaranteed delivery
procedure set forth in Section 3 of the Offer to Purchase. Pursuant to such
procedure: (a) such tender must be made by or through an Eligible Institution,
(b) a properly completed and duly executed Notice of Guaranteed Delivery
substantially in the form provided by Merger Subsidiary must be received by the
Depositary by the Expiration Date and (c) the certificates for all physically
delivered Shares, or a Book-Entry Confirmation, as well as a properly completed
and duly executed Letter of Transmittal (or facsimile thereof) (or, in the case
of a book-entry delivery, an Agent's Message) and any other documents required
by this Letter of Transmittal, must be received by the Depositary within three
Nasdaq National Market trading days after the date of execution of such Notice
of Guaranteed Delivery, all as provided in Section 3 of the Offer to Purchase.
 
    THE METHOD OF DELIVERY OF SHARES AND ALL OTHER REQUIRED DOCUMENTS, INCLUDING
DELIVERY THROUGH THE BOOK-ENTRY TRANSFER FACILITY, IS AT THE OPTION AND RISK OF
THE TENDERING STOCKHOLDER, AND THE DELIVERY WILL BE DEEMED MADE ONLY WHEN
ACTUALLY RECEIVED BY THE DEPOSITARY. IF CERTIFICATES FOR SHARES ARE SENT BY
MAIL, REGISTERED MAIL WITH RETURN RECEIPT REQUESTED, PROPERLY INSURED, IS
RECOMMENDED. IN ALL CASES, SUFFICIENT TIME SHOULD BE ALLOWED TO ENSURE TIMELY
DELIVERY.
 
    No alternative, conditional or contingent tenders will be accepted, and no
fractional Shares will be purchased. By executing this Letter of Transmittal (or
facsimile thereof), the tendering stockholder waives any right to receive any
notice of the acceptance for payment of the Shares.
 
    3.  INADEQUATE SPACE. If the space provided herein is inadequate, the
certificate numbers and/or the number of Shares should be listed on a separate
schedule attached hereto.
 
    4.  PARTIAL TENDERS (NOT APPLICABLE TO STOCKHOLDERS WHO TENDER BY BOOK-ENTRY
TRANSFER). If fewer than all the Shares represented by any certificate delivered
to the Depositary are to be tendered, fill in the number of Shares which are to
be tendered in the box entitled "Number of Shares Tendered". In such case, a new
certificate for the remainder of the Shares represented by the old certificate
will be sent to the person(s) signing this Letter of Transmittal, unless
otherwise provided in the appropriate box on this Letter of Transmittal, as
promptly as practicable following the expiration or termination of the Offer.
All Shares represented by certificates delivered to the Depositary will be
deemed to have been tendered unless otherwise indicated.
 
                                       7
<PAGE>
    5.  SIGNATURES ON LETTER OF TRANSMITTAL; STOCK POWERS AND ENDORSEMENTS. If
this Letter of Transmittal is signed by the registered holder(s) of the Shares
tendered hereby, the signature(s) must correspond with the name(s) as written on
the face of the certificates without alteration, enlargement or any change
whatsoever.
 
    If any of the Shares tendered hereby is held of record by two or more joint
owners, all such owners must sign this Letter of Transmittal.
 
    If any of the Shares tendered hereby are registered in different names on
different certificates, it will be necessary to complete, sign and submit as
many separate Letters of Transmittal as there are different registrations of
certificates.
 
    If this Letter of Transmittal is signed by the registered holder(s) of the
Shares tendered hereby, no endorsements of certificates or separate stock powers
are required unless payment of the purchase price is to be made, or Shares not
tendered or not purchased are to be returned, in the name of any person other
than the registered holder(s). Signatures on any such certificates or stock
powers must be guaranteed by an Eligible Institution.
 
    If this Letter of Transmittal is signed by a person other than the
registered holder(s) of the Shares tendered hereby, certificates must be
endorsed or accompanied by appropriate stock powers, in either case, signed
exactly as the name(s) of the registered holder(s) appear(s) on the certificates
for such Shares. Signature(s) on any such certificates or stock powers must be
guaranteed by an Eligible Institution.
 
    If this Letter of Transmittal or any certificate or stock power is signed by
a trustee, executor, administrator, guardian, attorney-in-fact, officer of a
corporation or other person acting in a fiduciary or representative capacity,
such person should so indicate when signing, and proper evidence satisfactory to
Merger Subsidiary of the authority of such person so to act must be submitted.
 
    6.  STOCK TRANSFER TAXES. Except as set forth in this Instruction 6, Merger
Subsidiary will pay any stock transfer taxes with respect to the sale and
transfer of purchased Shares to it or its order pursuant to the Offer. If,
however, payment of the purchase price is to be made to, or Shares not tendered
or not purchased are to be registered in the name of, any person other than the
registered holder(s), or if tendered certificates are registered in the name of
any person other than the person(s) signing this Letter of Transmittal, the
amount of any stock transfer taxes (whether imposed on the registered holder(s),
such other person or otherwise) payable on account of the transfer to such
person will be deducted from the purchase price unless satisfactory evidence of
the payment of such taxes, or exemption therefrom, is submitted.
 
    EXCEPT AS PROVIDED IN THIS INSTRUCTION 6, IT WILL NOT BE NECESSARY FOR
TRANSFER TAX STAMPS TO BE AFFIXED TO THE CERTIFICATES LISTED IN THIS LETTER OF
TRANSMITTAL.
 
    7.  SPECIAL PAYMENT AND DELIVERY INSTRUCTIONS. If the check for the purchase
price of any Shares purchased is to be issued, or any Shares not tendered or not
purchased are to be returned, in the name of a person other than the person(s)
signing this Letter of Transmittal or if the check or any certificates for
Shares not tendered or not purchased are to be mailed to someone other than the
person(s) signing this Letter of Transmittal or to the person(s) signing this
Letter of Transmittal at an address other than that shown above, the appropriate
boxes on this Letter of Transmittal should be completed.
 
    8.  WAIVER OF CONDITIONS. Subject to the terms of the Offer, Merger
Subsidiary reserves the absolute right in its sole discretion to waive any of
the specified conditions of the Offer (other than the Minimum Condition), in
whole or in part, in the case of any Shares tendered.
 
                                       8
<PAGE>
    9.  31% BACKUP WITHHOLDING; SUBSTITUTE FORM W-9. Under U.S. Federal income
tax law, a stockholder whose tendered Shares are accepted for payment is
required to provide the Depositary with such stockholder's correct taxpayer
identification number ("TIN") on Substitute Form W-9 below. If the Depositary is
not provided with the correct TIN, the Internal Revenue Service may subject the
stockholder or other payee to a $50 penalty. In addition, payments that are made
to such stockholder or other payee with respect to Shares purchased pursuant to
the Offer may be subject to 31% backup withholding.
 
    Certain stockholders (including among others, all corporations and certain
foreign individuals) are not subject to these backup withholding and reporting
requirements. In order for a foreign individual to qualify as an exempt
recipient, the stockholder must submit a Form W-8, signed under penalties of
perjury, attesting to that individual's exempt status. A Form W-8 can be
obtained from the Depositary. See the enclosed "Guidelines for Certification of
Taxpayer Identification Number on Substitute Form W-9" for more instructions.
 
    If backup withholding applies, the Depositary is required to withhold 31% of
any such payments made to the stockholder or other payee. Backup withholding is
not an additional tax. Rather, the tax liability of persons subject to backup
withholding will be reduced by the amount of tax withheld. If withholding
results in an overpayment of taxes, a refund may be obtained from the Internal
Revenue Service, provided that the required information is given to the Internal
Revenue Service.
 
    The box in Part 3 of the Substitute Form W-9 may be checked if the tendering
stockholder has not been issued a TIN and has applied for a TIN or intends to
apply for a TIN in the near future. If the box in Part 3 is checked, the
stockholder or other payee must also complete the Certificate of Awaiting
Taxpayer Identification Number below in order to avoid backup withholding.
Notwithstanding that the box in Part 3 is checked and the Certificate of
Awaiting Taxpayer Identification Number is completed, the Depositary will
withhold 31% on all payments made prior to the time a properly certified
Taxpayer Identification Number is provided to the Depositary. However, such
amounts will be refunded to such Stockholder if a Taxpayer Identification Number
is provided to the Depositary within 60 days.
 
    The stockholder is required to give the Depositary the TIN (E.G., social
security number or employer identification number) of the record owner of the
Shares or of the last transferee appearing on the transfers attached to, or
endorsed on, the Shares. If the Shares are in more than one name or are not in
the name of the actual owner, consult the enclosed "Guidelines for Certification
of Taxpayer Identification Number on Substitute Form W-9" for additional
guidance on which number to report.
 
    10. REQUESTS FOR ASSISTANCE OR ADDITIONAL COPIES. Requests for assistance or
additional copies of the Offer to Purchase and this Letter of Transmittal may be
obtained from the Information Agent at its address or telephone number set forth
below. Questions may be directed to the Information Agent.
 
    11. LOST, DESTROYED OR STOLEN CERTIFICATES. If any certificate representing
Shares has been lost, destroyed or stolen, the stockholder should promptly
notify the Depositary. The stockholder will then be instructed as to the steps
that must be taken in order to replace the certificate(s). This Letter of
Transmittal and related documents cannot be processed until the procedures for
replacing lost or destroyed certificates have been followed.
 
    12. ACCEPTANCE OF TENDERED SHARES. Upon the terms and subject to the
conditions of the Offer, Merger Subsidiary will have accepted for payment (and
thereby purchased) Shares validly tendered and not withdrawn when, as and if
Merger Subsidiary gives oral or written notice to the Depositary of its
acceptance of the tenders of such Shares pursuant to the Offer.
 
    13. WITHDRAWAL RIGHTS. Tendered Shares may be withdrawn only pursuant to the
procedure set forth in Section 4 of the Offer to Purchase.
 
    IMPORTANT: THIS LETTER OF TRANSMITTAL OR A FACSIMILE COPY HEREOF OR, IN THE
CASE OF A BOOK-ENTRY DELIVERY, AN AGENT'S MESSAGE (TOGETHER WITH CERTIFICATES
FOR, OR A BOOK-ENTRY CONFIRMATION WITH RESPECT TO, TENDERED SHARES WITH ANY
REQUIRED SIGNATURE GUARANTEES AND ALL OTHER REQUIRED DOCUMENTS) MUST BE RECEIVED
BY THE DEPOSITARY, OR THE NOTICE OF GUARANTEED DELIVERY MUST BE RECEIVED BY THE
DEPOSITARY, BY THE EXPIRATION DATE.
 
                                       9
<PAGE>
 
<TABLE>
<S>                                   <C>                                         <C>
- -------------------------------------------------------------------------------------------------------------------------
                                  PAYER'S NAME: AMERICAN STOCK TRANSFER & TRUST COMPANY
- -------------------------------------------------------------------------------------------------------------------------
SUBSTITUTE                            PART 1--PLEASE PROVIDE YOUR TIN IN THE BOX         Social Security Number or
FORM W-9                              AT RIGHT AND CERTIFY BY SIGNING AND DATING      Employer Identification Number
Department of the Treasury            BELOW.
Internal Revenue Service
Payer's Request for Taxpayer
Identification Number ("TIN")
                                      -----------------------------------------------------------------------------------
                                      PART 2--Certification--Under penalties of perjury, I certify that:
                                      (1)  The number shown on this form is my correct Taxpayer Identification Number (or
                                      I am waiting for a number to be issued to me) and
                                      (2)  I am not subject to backup withholding because: (a) I am exempt from backup
                                      withholding, or (b) I have not been notified by the Internal Revenue Service (the
                                           "IRS") that I am subject to backup withholding as a result of a failure to
                                           report all interest or dividends, or (c) the IRS has notified me that I am no
                                           longer subject to backup withholding.
                                      Certification Instructions--You must cross out Item (2) above if you have been
                                      notified by the IRS that you are currently subject to backup withholding because of
                                        under-reporting interest or dividends on you tax return. However, if after being
                                        notified by the IRS that you were subject to backup withholding you received
                                        another notification from the IRS that you are no longer subject to backup
                                        withholding, do not cross out such Item (2).
</TABLE>
 
<TABLE>
<S>                                   <C>                                                                <C>
                                      ---------------------------------------------------------------------------------------
                                                                                                         PART 3
                                      SIGNATURE   DATE , 1999                                            Awaiting TIN
- -----------------------------------------------------------------------------------------------------------------------------
</TABLE>
 
    NOTE:  FAILURE TO COMPLETE AND RETURN THIS FORM MAY RESULT IN BACKUP
           WITHHOLDING OF 31% OF ANY PAYMENTS MADE TO YOU PURSUANT TO THE OFFER.
           PLEASE REVIEW THE ENCLOSED GUIDELINES FOR CERTIFICATION OF TAXPAYER
           IDENTIFICATION NUMBER ON SUBSTITUTE FORM W-9 FOR ADDITIONAL DETAILS.
 
            YOU MUST COMPLETE THE FOLLOWING CERTIFICATE IF YOU CHECKED THE BOX
            IN PART 3 OF SUBSTITUTE FORM W-9.
 
             CERTIFICATE OF AWAITING TAXPAYER IDENTIFICATION NUMBER
 
    I certify under penalties of perjury that a taxpayer identification number
has not been issued to me, and either (1) I have mailed or delivered an
application to receive a taxpayer identification number to the appropriate
Internal Revenue Service Center or Social Security Administration Office, or (2)
I intend to mail or deliver an application in the near future. I understand that
if I do not provide a taxpayer identification number by the time of payment, 31%
of all reportable payments made to me will be withheld, but that such amounts
will be refunded to me if I then provide a Taxpayer Identification Number within
sixty (60) days.
 
Signature _______________________    Date ___________, 1999
 
                                       10
<PAGE>
                        THE DEPOSITARY FOR THE OFFER IS
 
                    AMERICAN STOCK TRANSFER & TRUST COMPANY
 
<TABLE>
<S>                               <C>                               <C>
            BY MAIL:                 BY FACSIMILE TRANSMISSION:       BY HAND/OVERNIGHT DELIVERY:
  40 Wall Street, 46(th) Floor      (Eligible Institutions Only)      40 Wall Street, 46(th) Floor
       New York, NY 10005                  (718) 234-5001                  New York, NY 10005
   (Attention: Reorganization                                          (Attention: Reorganization
           Department)                                                        Department)
                                       CONFIRM BY TELEPHONE:
                                           (718) 921-8200
 
                                       FOR INFORMATION CALL:
                                           (718) 921-8200
</TABLE>
 
                    THE INFORMATION AGENT FOR THE OFFER IS:
 
                            MacKenzie Partners, Inc.
 
                                156 Fifth Avenue
                               New York, New York
                         (212) 929-5500 (Call Collect)
                                       or
                         CALL TOLL-FREE (800) 322-2885
 
                                       11

<PAGE>
                                                                EXHIBIT 99(a)(3)
 
                         NOTICE OF GUARANTEED DELIVERY
 
                                      FOR
 
                        TENDER OF SHARES OF COMMON STOCK
                       (INCLUDING THE ASSOCIATED RIGHTS)
 
                                       OF
 
                    PLATINUM TECHNOLOGY INTERNATIONAL, INC.
 
    This Notice of Guaranteed Delivery, or one substantially in the form hereof,
must be used to accept the Offer (defined below) if (i) certificates
representing shares of Common Stock, par value $.001 per share, of PLATINUM
TECHNOLOGY International, INC., a Delaware corporation (the "Company"),
including the associated Class II Series A Junior Participating Preferred Share
Purchase Rights (the "Rights") issued pursuant to the Rights Agreement, dated as
of December 21, 1995, as amended, between the Company and Harris Trust and
Savings Bank, as Rights Agent (the shares and the Rights collectively referred
to as the "Shares") are not immediately available, (ii) the procedure for
book-entry transfer cannot be completed on a timely basis or (iii) time will not
permit all required documents to reach American Stock Transfer & Trust Company
(the "Depositary") prior to the expiration of the Offer. This Notice of
Guaranteed Delivery may be delivered by hand, facsimile transmission or mail to
the Depositary. See Section 3 of the Offer to Purchase.
 
                        THE DEPOSITARY FOR THE OFFER IS:
 
                    AMERICAN STOCK TRANSFER & TRUST COMPANY
 
<TABLE>
<S>                            <C>                            <C>
          BY MAIL:              BY FACSIMILE TRANSMISSION:     BY HAND/OVERNIGHT DELIVERY:
40 Wall Street, 46(th) Floor   (Eligible Institutions Only)   40 Wall Street, 46(th) Floor
     New York, NY 10005               (718) 234-5001               New York, NY 10005
 (Attention: Reorganization        CONFIRM BY TELEPHONE:       (Attention: Reorganization
         Department)                  (718) 921-8200                   Department)
                                   FOR INFORMATION CALL:
                                      (718) 921-8200
</TABLE>
 
DELIVERY OF THIS INSTRUMENT TO AN ADDRESS, OR TRANSMISSION OF INSTRUCTIONS VIA
FACSIMILE TRANSMISSION, OTHER THAN AS SET FORTH ABOVE WILL NOT CONSTITUTE A
VALID DELIVERY.
 
THIS FORM IS NOT TO BE USED TO GUARANTEE SIGNATURES. IF A SIGNATURE ON A LETTER
OF TRANSMITTAL IS REQUIRED TO BE GUARANTEED BY AN "ELIGIBLE INSTITUTION" UNDER
THE INSTRUCTIONS THERETO, SUCH SIGNATURE GUARANTEE MUST APPEAR IN THE APPLICABLE
SPACE PROVIDED IN THE SIGNATURE BOX ON THE APPROPRIATE LETTER OF TRANSMITTAL.
<PAGE>
Ladies and Gentlemen:
 
    The undersigned hereby tenders to HardMetal, Inc., a Delaware corporation
("Merger Subsidiary") and a wholly owned subsidiary of Computer Associates
International, Inc., a Delaware corporation, upon the terms and subject to the
conditions set forth in the Offer to Purchase, dated April 2, 1999 (the "Offer
to Purchase"), and the related Letter of Transmittal (which, together with any
supplements or amendments thereto, collectively constitute the "Offer"), receipt
of which is hereby acknowledged, the number of shares of Common Stock, par value
$.001 per share, of PLATINUM TECHNOLOGY International, INC., a Delaware
corporation (the "Company"), including the associated Class II Series A Junior
Participating Preferred Share Purchase Rights (the "Rights") issued pursuant to
the Rights Agreement, dated as of December 21, 1995, as amended, between the
Company and Harris Trust and Savings Bank, as Rights Agent (the shares and the
Rights collectively referred to as the "Shares") specified below, pursuant to
the guaranteed delivery procedure set forth in Section 3 of the Offer to
Purchase.
 
<TABLE>
<S>                                            <C>
Number of Shares and Certificate No(s) (if             Name(s) of Record Holder(s):
available):                                               (Please type or print)
 
                                               Address(es):
                                               (Zip Code)
 
/ / Check here if Shares will be tendered by   Area Code and Tel. No.:
book entry transfer.                           (Daytime telephone number)
 
DTC Account Number:                            Signature(s):
Dated: , 1999
</TABLE>
<PAGE>
                                   GUARANTEE
                    (Not to be used for signature guarantee)
 
    The undersigned, an Eligible Institution (defined in Section 3 of the Offer
to Purchase), hereby (i) represents that the tender of shares effected hereby
complies with Rule 14e-4 under the Securities Exchange Act of 1934, as amended
and (ii) guarantees delivery to the Depositary, at one of its addresses set
forth above, of certificates representing the Shares tendered hereby, in proper
form for transfer, or a confirmation of a book-entry transfer of such Shares
into the Depositary's account at the Book-Entry Transfer Facility (defined in
Section 3 of the Offer to Purchase), in either case together with a properly
completed and duly executed Letter of Transmittal (or facsimile thereof) or, in
the case of a book-entry transfer, an Agent's Message (defined in Section 2 of
the Offer to Purchase), together with any other documents required by the Letter
of Transmittal, all within three Nasdaq National Market trading days after the
date hereof.
 
<TABLE>
<S>                                            <C>
Name of Firm:                                             (Authorized Signature)
 
Address:                                       Name:
                                               (Please type or print)
                                  (Zip Code)   Title:
 
Area Code and Tel. No.:                        Date: , 1999
</TABLE>
 
NOTE:DO NOT SEND CERTIFICATES FOR SHARES WITH THIS NOTICE. CERTIFICATES SHOULD
    BE SENT WITH YOUR LETTER OF TRANSMITTAL.

<PAGE>
                                                                EXHIBIT 99(A)(4)
 
                             OFFER TO PURCHASE FOR CASH
                     ALL OUTSTANDING SHARES OF COMMON STOCK
                       (INCLUDING THE ASSOCIATED RIGHTS)
                                       OF
                    PLATINUM TECHNOLOGY INTERNATIONAL, INC.
                                       AT
                              $29.25 NET PER SHARE
                                       BY
                                HARDMETAL, INC.
                          a wholly owned subsidiary of
                    COMPUTER ASSOCIATES INTERNATIONAL, INC.
- --------------------------------------------------------------------------------
THE OFFER AND WITHDRAWAL RIGHTS EXPIRE AT 12:00 MIDNIGHT, NEW YORK CITY TIME, ON
            THURSDAY, APRIL 29, 1999, UNLESS THE OFFER IS EXTENDED.
- --------------------------------------------------------------------------------
 
                                                                   April 2, 1999
 
To Brokers, Dealers, Commercial Banks, Trust Companies and Other Nominees:
 
    We are enclosing the material listed below in connection with the offer by
HardMetal, Inc., a Delaware corporation ("Merger Subsidiary") and a wholly owned
subsidiary of Computer Associates International, Inc., a Delaware corporation,
to purchase all outstanding shares of Common Stock, par value $.001 per share,
of PLATINUM TECHNOLOGY International, INC., a Delaware corporation (the
"Company"), including the associated Class II Series A Junior Participating
Preferred Share Purchase Rights (the "Rights") issued pursuant to the Rights
Agreement, dated as of December 21, 1995, as amended, between the Company and
Harris Trust and Savings Bank, as Rights Agent (the shares and the Rights
collectively referred to as the "Shares") at $29.25 per Share, net to the seller
in cash, upon the terms and subject to the conditions set forth in Merger
Subsidiary's Offer to Purchase, dated April 2, 1999 (the "Offer to Purchase"),
and the related Letter of Transmittal (which, together with any supplements or
amendments thereto, collectively constitute the "Offer").
 
    For your information and for forwarding to your clients for whom you hold
Shares registered in your name or in the name of your nominee, we are enclosing
the following documents:
 
    1.  Offer to Purchase;
 
    2.  Letter of Transmittal for your use and for the information of your
       clients;
 
    3.  Notice of Guaranteed Delivery to be used to accept the Offer if the
       Shares and all other required documents cannot be delivered to the
       Depositary by the Expiration Date (defined in Section 1 of the Offer to
       Purchase) or if the procedure for book-entry transfer cannot be completed
       by the Expiration Date;
 
    4.  A form of letter which may be sent to your clients for whose accounts
       you hold Shares registered in your name or in the name of your nominee,
       with space provided for obtaining such clients' instructions with regard
       to the Offer;
 
    5.  Guidelines for Certification of Taxpayer Identification Number on
       Substitute Form W-9 providing information relating to backup federal
       income tax withholding; and
 
    6.  Return envelope addressed to American Stock Transfer & Trust Company,
       the Depositary.
 
    WE URGE YOU TO CONTACT YOUR CLIENTS AS PROMPTLY AS POSSIBLE. PLEASE NOTE
THAT THE OFFER AND WITHDRAWAL RIGHTS EXPIRE AT 12:00 MIDNIGHT, NEW YORK CITY
TIME, ON THURSDAY, APRIL 29, 1999, UNLESS THE OFFER IS EXTENDED.
<PAGE>
    In order to take advantage of the Offer, (i) a properly completed and duly
executed Letter of Transmittal (or facsimile thereof) or an Agent's Message
(defined in Section 2 of the Offer to Purchase) in connection with a book-entry
delivery of Shares, and all other required documents should be sent to the
Depositary, and (ii) either certificates representing the tendered Shares should
be delivered to the Depositary, or such Shares should be tendered by book-entry
transfer into the Depositary's account maintained at the Book-Entry Transfer
Facility (described in Section 3 of the Offer to Purchase), all in accordance
with the instructions set forth in the Letter of Transmittal and the Offer to
Purchase.
 
    Merger Subsidiary will not pay any fees or commissions to any broker or
dealer or other person (other than the Information Agent and the Depositary as
described in the Offer to Purchase) for soliciting tenders of Shares pursuant to
the Offer. Merger Subsidiary will, however, upon request, reimburse brokers,
dealers, commercial banks and trust companies for reasonable and necessary costs
and expenses incurred by them in forwarding materials to their customers. Merger
Subsidiary will pay all stock transfer taxes applicable to its purchase of
Shares pursuant to the Offer, subject to Instruction 6 of the Letter of
Transmittal.
 
    Any inquiries you may have with respect to the Offer should be addressed to,
and additional copies of the enclosed materials may be obtained from, the
Information Agent at the addresses and telephone numbers set forth on the back
cover of the Offer to Purchase.
 
                                          Very truly yours,
                                          HardMetal, Inc.
 
NOTHING CONTAINED HEREIN OR IN THE ENCLOSED DOCUMENTS SHALL CONSTITUTE YOU THE
AGENT OF HARDMETAL, INC., COMPUTER ASSOCIATES INTERNATIONAL, INC., THE
INFORMATION AGENT OR THE DEPOSITARY OR ANY AFFILIATE OF ANY OF THEM OR AUTHORIZE
YOU OR ANY OTHER PERSON TO USE ANY DOCUMENT OR MAKE ANY STATEMENT ON BEHALF OF
ANY OF THEM IN CONNECTION WITH THE OFFER OTHER THAN THE ENCLOSED DOCUMENTS AND
THE STATEMENTS CONTAINED THEREIN.
 
                                       2

<PAGE>
                                                                EXHIBIT 99(a)(5)
 
                           OFFER TO PURCHASE FOR CASH
                     ALL OUTSTANDING SHARES OF COMMON STOCK
                       (INCLUDING THE ASSOCIATED RIGHTS)
                                       OF
                    PLATINUM TECHNOLOGY INTERNATIONAL, INC.
                                       AT
                              $29.25 NET PER SHARE
                                       BY
                                HARDMETAL, INC.
                          a wholly owned subsidiary of
                    COMPUTER ASSOCIATES INTERNATIONAL, INC.
- --------------------------------------------------------------------------------
THE OFFER AND WITHDRAWAL RIGHTS EXPIRE AT 12:00 MIDNIGHT, NEW YORK CITY TIME, ON
            THURSDAY, APRIL 29, 1999, UNLESS THE OFFER IS EXTENDED.
- --------------------------------------------------------------------------------
 
To Our Clients:
 
    Enclosed for your consideration are the Offer to Purchase, dated April 2,
1999, (the "Offer to Purchase"), and the related Letter of Transmittal (which,
together with any amendments or supplements thereto, collectively constitute the
"Offer") relating to an offer by HardMetal, Inc., a Delaware corporation
("Merger Subsidiary") and a wholly-owned subsidiary of Computer Associates
International, Inc., a Delaware corporation ("Computer Associates"), to purchase
all outstanding shares of Common Stock, par value $.001 per share, of PLATINUM
TECHNOLOGY International, INC., a Delaware corporation (the "Company"),
including the associated Class II Series A Junior Participating Preferred Share
Purchase Rights (the "Rights") issued pursuant to the Rights Agreement, dated as
of December 21, 1995, as amended, between the Company and Harris Trust and
Savings Bank, as Rights Agent (the shares and the Rights collectively referred
to as the "Shares") at a purchase price of $29.25 per Share, net to the seller
in cash, upon the terms and subject to the conditions set forth in the Offer.
Holders of Shares whose certificates for such Shares are not immediately
available or who cannot deliver their certificates and all other required
documents to the Depositary, or complete the procedure for book-entry transfer
set forth in Section 3 of the Offer to Purchase, prior to the Expiration Date
(defined in Section 1 of the Offer to Purchase) must tender their Shares
according to the guaranteed delivery procedures set forth in Section 3 of the
Offer to Purchase.
 
    WE ARE THE HOLDER OF RECORD OF SHARES HELD FOR YOUR ACCOUNT. A TENDER OF
SUCH SHARES CAN BE MADE ONLY BY US AS THE HOLDER OF RECORD AND PURSUANT TO YOUR
INSTRUCTIONS. THE LETTER OF TRANSMITTAL IS FURNISHED TO YOU FOR YOUR INFORMATION
ONLY AND CANNOT BE USED BY YOU TO TENDER SHARES HELD BY US FOR YOUR ACCOUNT.
 
    We request instructions as to whether you wish us to tender any or all of
the Shares held by us for your account, upon the terms and subject to the
conditions set forth in the Offer.
 
    Your attention is directed to the following:
 
    1.  The tender price is $29.25 per Share, net to you in cash without
       interest thereon, upon the terms and subject to the conditions set forth
       in the Offer.
 
    2.  The Board of Directors of the Company has unanimously determined that
       the Offer and the transactions contemplated by the Merger Agreement
       (defined in the Introduction to the Offer to Purchase) are fair to, and
       in the best interests of, the stockholders of the Company, has
       unanimously approved the Offer and the transactions contemplated by the
       Merger Agreement,
<PAGE>
       and unanimously recommends that the stockholders of the Company accept
       the Offer and tender their Shares.
 
    3.  The Offer and withdrawal rights expire at 12:00 Midnight, New York City
       time, on Thursday, April 29, 1999, unless the Offer is extended. In all
       cases, payment for Shares accepted for payment pursuant to the Offer will
       be made only after timely receipt by the Depositary of (i) certificates
       for such Shares (or a confirmation of a book-entry transfer of such
       Shares as described in Section 2 of the Offer to Purchase), (ii) a
       properly completed and duly executed Letter of Transmittal (or facsimile
       thereof) or an Agent's Message (defined in Section 2 of the Offer to
       Purchase) in connection with a book-entry transfer and (iii) any other
       documents required by the Letter of Transmittal.
 
    4.  The Offer is conditioned upon, among other things, (i) there being
       validly tendered by the Expiration Date and not withdrawn a number of
       Shares which, together with the Shares then owned by Merger Subsidiary
       and Computer Associates, would represent at least a majority of the Fully
       Diluted Shares (defined in the Introduction to the Offer to Purchase) and
       (ii) the expiration or termination of the applicable waiting period under
       the Hart-Scott-Rodino Antitrust Improvements Act of 1976.
 
    5.  Merger Subsidiary will pay any stock transfer taxes applicable to the
       sale of Shares to Merger Subsidiary pursuant to the Offer, except as
       otherwise provided in Instruction 6 of the Letter of Transmittal.
 
    If you wish to have us tender any or all of your Shares, please so instruct
us by completing, executing, detaching and returning to us the instruction form
on the detachable part hereof. An envelope to return your instructions to us is
enclosed. If you authorize tender of your Shares, all such Shares will be
tendered unless otherwise specified on the detachable part hereof. Your
instructions should be forwarded promptly to permit us to submit a tender on
your behalf by the expiration of the Offer. If you do not instruct us to tender
your Shares, they will not be tendered.
 
    The Offer is not being made to, nor will tenders be accepted from or on
behalf of, holders of Shares in any jurisdiction in which the making of the
Offer or acceptance thereof would not be in compliance with the laws of such
jurisdiction.
 
                                       2
<PAGE>
               INSTRUCTIONS WITH RESPECT TO THE OFFER TO PURCHASE
                FOR CASH ALL OUTSTANDING SHARES OF COMMON STOCK
                       (INCLUDING THE ASSOCIATED RIGHTS)
                                       OF
                    PLATINUM TECHNOLOGY INTERNATIONAL, INC.
                                       BY
                                HARDMETAL, INC.
 
    The undersigned acknowledge(s) receipt of your letter and the enclosed Offer
to Purchase, dated April 2, 1999, and the related Letter of Transmittal,
relating to the offer by HardMetal, Inc., a Delaware corporation and a wholly
owned subsidiary of Computer Associates International, Inc., a Delaware
corporation, to purchase all outstanding shares of Common Stock, par value $.001
per share, of PLATINUM TECHNOLOGY International, INC., a Delaware corporation
(the "Company"), including the associated Class II Series A Junior Participating
Preferred Share Purchase Rights (the "Rights") issued pursuant to the Rights
Agreement, dated as of December 21, 1995, as amended, between the Company and
Harris Trust and Savings Bank, as Rights Agent (the shares and the Rights
collectively referred to as the "Shares").
 
    The undersigned instructs you to tender the number of Shares indicated below
held by you for the account of the undersigned, upon the terms and subject to
the conditions set forth in such Offer to Purchase and the related Letter of
Transmittal.
 
Dated:__________________, 1999
 
<TABLE>
<C>                       <S>
    Number of Shares      (Signature)
    to be Tendered:
         Shares
 
                          Please Print Names(s)
                          Address
                          Include Zip Code
                          Area Code and
                          Telephone No.
                          Taxpayer Identification
                          or Social Security No.
</TABLE>
 
- ------------------------
 
    * Unless otherwise indicated, it will be assumed that all Shares held by us
for your account are to be tendered.
 
                                       3

<PAGE>

                                                               Exhibit 99(a)(6)

COMPUTER ASSOCIATES TO ACQUIRE
PLATINUM TECHNOLOGY IN LARGEST SOFTWARE
DEAL IN HISTORY

CASH TRANSACTION, VALUED AT MORE THAN $3.5 BILLION, TO
COMPLEMENT CA'S TECHNOLOGY AND SERVICES

ISLANDIA, N.Y.--(BUSINESS WIRE)--March 29, 1999-- In the largest transaction in
the history of the software industry, Computer Associates International, Inc.
(NYSE: CA) and PLATINUM technology International, inc. (NASDAQ:PLAT) have
entered into a merger agreement for CA to acquire PLATINUM through a cash tender
offer. A wholly-owned subsidiary of CA will offer to purchase all outstanding
shares of PLATINUM's common stock for $29.25 per share.

The merger has been unanimously approved by the Boards of Directors of both
PLATINUM and CA. CA will fund the acquisition through a $4.5 billion credit
facility underwritten entirely by Credit Suisse First Boston. This new facility
will replace CA's existing $2.6 billion lines of credit.

"This transaction provides tremendous synergies in products, markets and
services with very little overlap, creating exciting growth opportunities for CA
in many new and emerging markets," said CA President and COO Sanjay Kumar.
"PLATINUM's leadership in knowledge management, data warehouse, data base tools
and application lifecycle management perfectly complements the e-commerce
management and development technologies embodied in Jasmine, CA's
object-oriented database. By enabling organizations to easily create knowledge
portals, CA will become the premier end-to-end solutions provider for building
and deploying enterprise applications."

"In addition, many organizations around the world are already enjoying the
benefits of the integration between PLATINUM's best-of-breed point solutions and
CA's flagship Unicenter TNG's management framework," Kumar said "We look forward
to building a collectively stronger enterprise that can provide a broader range
of solutions to clients, greater opportunities for employees from both
companies, and accelerated near and long-term shareholder return."

PLATINUM provides software products and consulting services that help Global
10,000 companies manage and improve their IT infrastructures--including systems
and database management, e-commerce, application infrastructure management, data
warehousing, knowledge management, decision support, and year 2000
reengineering. The 12-year-old company has more than 120 offices across six
continents.

"PLATINUM, its management and employees are extremely proud of the world-class
organization we have built over the past 12 years," said Andrew "Flip"
Filipowski, president and CEO of PLATINUM. "We have strived hard to service our
customers, provide great opportunities for our employees, and deliver superior
returns to our shareholders. As we 

<PAGE>

approach the new millennium, it is increasingly apparent that consolidations in
our industry make it evident that this change is critical to PLATINUM's future.

"CA's recognition of PLATINUM's true value combined with its commitment to
fairly compensate our shareholders makes this transaction a compelling value
proposition for everyone involved," said Filipowski. "The combination of CA's
technology, operational skills and market reach together with PLATINUM's
technology and people, create the model software and services provider for the
next century. We're confident that, given our intensive discussions with CA over
the past week, this alliance will be extremely beneficial to our clients and
employees. CA's track record of developing and integrating leading-edge products
should give our clients confidence in the future when managing their
mission-critical systems."

"After over a decade of building PLATINUM," said Filipowski, "I'm pleased,
confident and relieved that the organization we have built, along with our
customers and people, will be in the extremely capable hands of CA, its people
and management team."

PLATINUM's wide-ranging consulting and implementation services will also
complement CA's rapidly-growing Global Professional Services (GPS), formed last
April in response to increased client demand for turnkey best-of-class
solutions. PLATINUM's consultants will quickly extend GPS' capabilities,
especially in Europe, where PLATINUM has a significant presence.

In the tender offer, CA seeks to purchase at least a majority of PLATINUM's
outstanding shares. Consummation of the tender offer will be subject to the
expiration or termination of any applicable antitrust waiting period and the
receipt of all regulatory approvals. Following completion of the tender offer,
the subsidiary of CA will be merged into PLATINUM, and all of PLATINUM's shares
not owned by CA will be converted into the right to receive $29.25 per share in
cash. CA estimates that, following the completion of the merger and
restructuring, this transaction will be accretive to net earnings in the first
12 months in the amount of about 25 cents per share, excluding in-process R&D
and restructuring charges. In addition, the company anticipates that following
the restructuring, the acquisition will generate an additional $450 million of
cash from operations.

CA was advised on this transaction by the law firm of Howard, Smith and Levin.
Advisors for PLATINUM were Credit Suisse First Boston and the law firm of Katten
Muchin & Zavis.

Computer Associates International, Inc. (NYSE:CA), the world leader in
mission-critical business computing, provides software, support and integration
services in more than 100 countries around the world. CA has more than 13,000
employees and had revenue of $5.1 billion in calendar year 1998. For more
information about CA, please call 516-342-5224 or email [email protected]. CA's World
Wide Web address is www.cai.com.

PLATINUM technology International, inc., headquartered in Oakbrook Terrace,
Illinois, had 1998 revenues of $968 million. PLATINUM provides software and
services that help IT organizations manage and improve the IT infrastructure.

<PAGE>

Statements in this release concerning the Company's future prospects are
"forward-looking statements" under the Private Securities Litigation Reform Act
of 1995. There can be no assurances that future results will be achieved, and
actual results could differ materially from forecasts and estimates. Important
factors that could cause actual results to differ materially include: the
significant percentage of CA's quarterly sales recorded in the last few days of
the quarter, making financial predictions especially difficult and raising a
substantial risk of variance in actual results; the emergence of new competitive
initiatives resulting from rapid technological advances or changes in pricing in
the market; the risks associated with new product introductions as well as the
uncertainty of customer acceptance of these new or enhanced products from either
CA or its competition; risks associated with the entry into new markets such as
professional services; delays in product delivery; the ability to recruit and
retain qualified personnel; negative implications from the "Year 2000" or "Euro"
implementation technology problem, including customer indecision, purchasing
delays or budget re-allocations; business conditions in the client/server and
mainframe software and hardware markets; use of software patent rights to
attempt to limit competition; assimilation of business or technology
acquisitions; fluctuations in foreign currency exchange rates; the volatility of
the international marketplace, including the recent Asian and Latin American
turmoil; and other risks described in filings with the Securities and Exchange
Commission.

All referenced product names are trademarks of their respective companies.

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

Contact:

         Computer Associates, Islandia
         Doug Robinson, CA investor relations, 516-342-2745 or
           [email protected] or,
         Bob Gordon, CA public relations, 516-342-2391 or
           [email protected]
                  or
         Mike Cullinane, PLATINUM investor relations, 630-691-0700 or
         [email protected] or, 
         Michael Matthews, PLATINUM public relations,
         630-691-9132 or [email protected]



<PAGE>
                                                                EXHIBIT 99(a)(7)
 
            GUIDELINES FOR CERTIFICATION OF TAXPAYER IDENTIFICATION
                         NUMBER ON SUBSTITUTE FORM W-9
 
    GUIDELINES FOR DETERMINING THE PROPER IDENTIFICATION NUMBER TO GIVE THE
PAYER.-- Social Security numbers have nine digits separated by two hyphens: I.E.
000-00-0000. Employer identification numbers have nine digits separated by only
one hyphen: I.E. 00-0000000. The table below will help determine the number to
give the payer.
<TABLE>
<CAPTION>
- -----------------------------------------------------
                                 GIVE THE NAME AND
                                 SOCIAL SECURITY
FOR THIS TYPE OF ACCOUNT:        NUMBER OF
- -----------------------------------------------------
<S>        <C>                   <C>
1.         An individual's       The individual
           account
 
2.         Two or more           The actual owner of
           individuals (joint    the account or, if
           account)              combined funds, any
                                 one of the
                                 individuals(1)
 
3.         Custodian account of  The minor(2)
           a minor (Uniform
           Gift to Minors Act)
 
4.         (a) The usual         The grantor-
              revocable savings  trustee(1)
              trust account
              (grantor is also
              trustee)
 
           (b) So-called trust   The actual owner(1)
              account that is
              not a legal or
              valid trust under
              State law
 
5.         Sole proprietorship   The Owner(3)
           account
- -----------------------------------------------------
 
<CAPTION>
                                 GIVE THE NAME AND
                                 EMPLOYER
                                 IDENTIFICATION
FOR THIS TYPE OF ACCOUNT:        NUMBER OF
<S>        <C>                   <C>
- -----------------------------------------------------
 
6.         A valid trust,        The legal entity (Do
           estate, or pension    not furnish the
           trust                 identifying number
                                 of the personal
                                 representative or
                                 trustee unless the
                                 legal entity itself
                                 is not designated in
                                 the account
                                 title.)(4)
 
7.         Corporate account     The corporation
 
8.         Religious,            The organization
           charitable, or
           educational
           organization account
 
9.         Partnership           The partnership
 
10.        Association, club,    The organization
           or other tax-exempt
           organization
 
11.        A broker or           The broker or
           registered nominee    nominee
 
12.        Account with the      The public entity
           Department of
           Agriculture in the
           name of a public
           entity (such as a
           State or local
           government, school
           district, or prison)
           that receives
           agricultural program
           payments
 
13.        Sole proprietorship   The owner(3)
           account
</TABLE>
 
- ---------------------------------------------
- ---------------------------------------------
 
(1) List first and circle the name of the person whose number you furnish.
 
(2) Circle the minor's name and furnish the minor's social security number.
 
(3) Show the name of the owner. You may also enter your business name. You may
    use your Social Security Number or Employer Identification Number.
 
(4) List first and circle the name of the legal trust, estate, or pension trust.
 
NOTE: If no name is circled when there is more than one name, the number will be
considered to be that of the first name listed.
<PAGE>
            GUIDELINES FOR CERTIFICATION OF TAXPAYER IDENTIFICATION
                         NUMBER ON SUBSTITUTE FORM W-9
 
                                     PAGE 2
 
OBTAINING A NUMBER
 
If you don't have a taxpayer identification number or you don't know your
number, obtain Form SS-5, Application for a Social Security Number Card, or Form
SS-4, Application for Employer Identification Number, at the local office of the
Social Security Administration or the Internal Revenue Service and apply for a
number.
 
PAYEES EXEMPT FROM BACKUP WITHHOLDING
 
Payees specifically exempted from backup withholding on ALL payments include the
following:
 
- -  A corporation.
 
- -  A financial institution.
 
- -  An organization exempt from tax under section 501(a), or an individual
    retirement plan or a custodial account under Section 403(b)(7).
 
- -  The United States or any agency or instrumentality thereof.
 
- -  A State, the District of Columbia, a possession of the United States, or any
    subdivision or instrumentality thereof.
 
- -  A foreign government, a political subdivision of a foreign government, or any
    agency or instrumentality thereof.
 
- -  An international organization or any agency, or instrumentality thereof.
 
- -  A registered dealer in securities or commodities registered in the U.S. or a
    possession of the U.S.
 
- -  A real estate investment trust.
 
- -  A common trust fund operated by a bank under section 584(a).
 
- -  An exempt charitable remainder trust, or a non-exempt trust described in
    section 4947(a)(1).
 
- -  An entity registered at all times under the Investment Company Act of 1940.
 
- -  A foreign central bank of issue.
 
- -  A futures commission merchant registered with the Commodity Futures Trading
    Commission.
 
- -  A middleman known in the investment community as a nominee or listed in the
    most recent publication of the American Society of Corporate Secretaries,
    Inc. Nominee List.
 
Payments of dividends and patronage dividends not generally subject to backup
withholding include the following:
 
- -  Payments to nonresident aliens subject to withholding under section 1441.
 
- -  Payments to partnerships not engaged in a trade or business in the U.S. and
    which have at least one nonresident partner.
 
- -  Payments of patronage dividends where the amount received is not paid in
    money.
 
- -  Payments made by certain foreign organizations.
 
Payments of interest not generally subject to backup withholding include the
following:
 
- -  Payments of interest on obligations issued by individuals. Note: You may be
    subject to backup withholding if this interest is $600 or more and is paid
    in the course of the payer's trade or business and you have not provided
    your correct taxpayer identification number to the payer.
 
- -  Payments of tax-exempt interest (including exempt-interest dividends under
    section 852).
 
- -  Payments described in section 6049(b)(5) to non-resident aliens.
 
- -  Payments on tax-free covenant bonds under section 1451.
 
- -  Payments made by certain foreign organizations.
 
- -  Mortgage interest paid to an individual.
 
EXEMPT PAYEES DESCRIBED ABOVE SHOULD FILE FORM W-9 TO AVOID POSSIBLE ERRONEOUS
BACKUP WITHHOLDING. FILE THIS FORM WITH THE PAYER, FURNISH YOUR TAXPAYER
IDENTIFICATION NUMBER, WRITE "EXEMPT" ON THE FACE OF THE FORM, AND RETURN IT TO
THE PAYER. IF THE PAYMENTS ARE INTEREST, DIVIDENDS, OR PATRONAGE DIVIDENDS, ALSO
SIGN AND DATE THE FORM.
 
Certain payments, other than interest, dividends, and patronage dividends, that
are not subject to information reporting, are also not subject to backup
withholding. For details, see the regulations under sections 6041, 6041A(a),
6045, and 6050A.
 
PRIVACY ACT NOTICE--Section 6109 requires most recipients of dividend, interest,
or other payments to give taxpayer identification numbers to payers who must
report the payments to IRS. IRS uses the numbers for identification purposes.
Payers must be given the numbers whether or not recipients are required to file
tax returns. Payers must generally withhold 31% of taxable interest, dividend,
and certain other payments to a payee who does not furnish a taxpayer
identification number to a payer. Certain penalties may also apply.
 
PENALTIES
 
(1) PENALTY FOR FAILURE TO FURNISH TAXPAYER IDENTIFICATION NUMBER--If you fail
to furnish your taxpayer identification number to a payer, you are subject to a
penalty of $50 for each such failure unless your failure is due to reasonable
cause and not to willful neglect.
 
(2) CIVIL PENALTY FOR FALSE INFORMATION WITH RESPECT TO WITHHOLDING--If you make
a false statement with no reasonable basis which results in no imposition of
backup withholding, you are subject to a penalty of $500.
 
(3) CRIMINAL PENALTY FOR FALSIFYING INFORMATION--Falsifying certifications or
affirmations may subject you to criminal penalties including fines and/or
imprisonment.
 
                       FOR ADDITIONAL INFORMATION CONTACT
                      YOUR TAX CONSULTANT OR THE INTERNAL
                                REVENUE SERVICE.

<PAGE>
                                                                EXHIBIT 99(a)(8)
 
    This announcement is neither an offer to purchase nor a solicitation of an
offer to sell Shares. The Offer is made solely by the Offer to Purchase dated
April 2, 1999 and the related Letter of Transmittal and any amendments or
supplements thereto and is being made to all holders of Shares. The Offer is not
being made to, nor will tenders be accepted from or on behalf of, holders of
Shares in any jurisdiction in which the making of the Offer or acceptance
thereof would not be in compliance with the laws of such jurisdiction. In any
jurisdiction where the securities, blue sky or other laws require that the Offer
be made by a licensed broker or dealer, the Offer shall be deemed to be made on
behalf of Merger Subsidiary by one or more registered brokers licensed under the
laws of such jurisdiction.
 
                      NOTICE OF OFFER TO PURCHASE FOR CASH
                     ALL OUTSTANDING SHARES OF COMMON STOCK
                         (INCLUDING ASSOCIATED RIGHTS)
                                       OF
                    PLATINUM TECHNOLOGY INTERNATIONAL, INC.
                                       AT
                              $29.25 NET PER SHARE
                                       BY
                                HARDMETAL, INC.
                          A WHOLLY OWNED SUBSIDIARY OF
                    COMPUTER ASSOCIATES INTERNATIONAL, INC.
 
    HardMetal, Inc., a Delaware corporation ("Merger Subsidiary") and a wholly
owned subsidiary of Computer Associates International, Inc., a Delaware
corporation ("Computer Associates"), is offering to purchase all outstanding
shares of Common Stock, par value $.001 per share (including the associated
Rights (issued pursuant to the Rights Agreement, dated December 21, 1995,
between the Company and Harris Trust and Savings Bank)(the "Shares"), of
PLATINUM TECHNOLOGY International, INC., a Delaware corporation (the "Company"),
at $29.25 per Share, net to the seller in cash, upon the terms and subject to
the conditions set forth in the Offer to Purchase dated April 2, 1999 (the
"Offer to Purchase") and in the related Letter of Transmittal (which, together
with any amendments or supplements thereto, collectively constitute the
"Offer"). Tendering stockholders of the Company will not be obligated to pay
brokerage fees or commissions or, except as set forth in the Letter of
Transmittal, transfer taxes on the purchase of Shares pursuant to the Offer.
 
THE OFFER AND WITHDRAWAL RIGHTS EXPIRE AT 12:00 MIDNIGHT, NEW YORK CITY TIME, ON
THURSDAY, APRIL 29, 1999, UNLESS THE OFFER IS EXTENDED.
 
    THE OFFER IS CONDITIONED UPON, AMONG OTHER THINGS, (1) THERE BEING VALIDLY
TENDERED BY THE EXPIRATION OF THE OFFER AND NOT WITHDRAWN A NUMBER OF SHARES
WHICH, TOGETHER WITH THE SHARES THEN OWNED BY COMPUTER ASSOCIATES AND MERGER
SUBSIDIARY, WOULD REPRESENT AT LEAST A MAJORITY OF THE TOTAL NUMBER OF
OUTSTANDING SHARES ON A FULLY DILUTED BASIS AND (2) THE EXPIRATION OR
TERMINATION OF THE APPLICABLE WAITING PERIOD UNDER THE HART-SCOTT-RODINO
ANTITRUST IMPROVEMENTS ACT OF 1976.
 
    The Offer is being made pursuant to an Agreement and Plan of Merger, dated
as of March 29, 1999 (the "Merger Agreement"), among the Company, Computer
Associates and Merger Subsidiary, which has been unanimously approved by the
Company's Board of Directors. The Merger Agreement provides, among other things,
that, after consummation of the Offer, and after satisfaction or waiver of all
conditions to the Merger (defined below) set forth in the Merger Agreement,
Merger Subsidiary will be merged into the Company (the "Merger"), with the
Company continuing as the surviving corporation (the "Surviving Corporation").
Pursuant to the Merger Agreement, at the effective time of the Merger (the
"Effective
<PAGE>
Time"), each outstanding Share (other than Shares owned by Computer Associates,
Merger Subsidiary or any subsidiary of either of them or held by the Company as
treasury stock (which shall be canceled) or by stockholders exercising appraisal
rights under Delaware Law) will be converted into the right to receive $29.25 in
cash or any higher price paid for each Share in the Offer, without interest.
 
    THE BOARD OF DIRECTORS OF THE COMPANY HAS UNANIMOUSLY DETERMINED THAT THE
OFFER AND THE TRANSACTIONS CONTEMPLATED BY THE MERGER AGREEMENT ARE FAIR TO, AND
IN THE BEST INTERESTS OF, THE STOCKHOLDERS OF THE COMPANY, HAS UNANIMOUSLY
APPROVED THE OFFER AND THE TRANSACTIONS CONTEMPLATED BY THE MERGER AGREEMENT,
AND UNANIMOUSLY RECOMMENDS THAT THE STOCKHOLDERS OF THE COMPANY ACCEPT THE OFFER
AND TENDER THEIR SHARES.
 
    Merger Subsidiary reserves the right, at any time or from time to time, in
its sole discretion, to extend the period of time during which the Offer is open
if, at the scheduled expiration date of the Offer or any extension thereof, any
of the conditions to the Offer shall not have been satisfied, until such time as
such conditions are satisfied or waived, and for a further period of time of not
more than 20 business days, regardless of whether or not any of the conditions
to the Offer have been satisfied, to meet the objective (which is not a
condition to the Offer) that there be validly tendered and not withdrawn at
least 90% of the Shares on a fully diluted basis. Under certain circumstances,
in connection with obtaining regulatory clearance for the consummation of the
Offer and the Merger, Merger Subsidiary is required under the Merger Agreement
to extend the Offer pending such clearance. Any such extension will be made by
giving oral or written notice thereof to the Depositary (defined below) and will
be followed as promptly as practicable by public announcement thereof.
 
    For purposes of the Offer, Merger Subsidiary shall be deemed to have
accepted for payment tendered Shares when, as and if Merger Subsidiary gives
oral or written notice to American Stock Transfer & Trust Company (the
"Depositary") of its acceptance of the tenders of such Shares. In all cases,
payment for Shares accepted for payment pursuant to the Offer will be made only
after timely receipt by the Depositary of (i) certificates for such Shares (or
of a confirmation of a book-entry transfer of such Shares into the Depositary's
account at the Book-Entry Transfer Facility (defined in the Offer to Purchase)),
(ii) a properly completed and duly executed Letter of Transmittal (or facsimile
thereof) or an Agent's Message (defined in the Offer to Purchase) in connection
with a book-entry transfer, and (iii) any other required documents.
 
    Tenders of Shares made pursuant to the Offer may be withdrawn at any time
prior to the expiration of the Offer. Thereafter, such tenders are irrevocable,
except that they may be withdrawn on or after May 31, 1999, unless theretofore
accepted for payment as provided in the Offer to Purchase. If Merger Subsidiary
extends the period of time during which the Offer is open, is delayed in
accepting for payment or paying for Shares or is unable to accept for payment or
pay for Shares pursuant to the Offer for any reason, then, without prejudice to
Merger Subsidiary's rights under the Offer, the Depositary may, on behalf of
Merger Subsidiary, retain all Shares tendered, and such Shares may not be
withdrawn except as otherwise provided in the Offer to Purchase. For a
withdrawal to be effective, a written or facsimile transmission notice of
withdrawal must be timely received by the Depositary at one of its addresses set
forth in the Offer to Purchase and must specify the name of the person who
tendered the Shares to be withdrawn and the number of Shares to be withdrawn. If
the Shares to be withdrawn have been delivered to the Depositary, a signed
notice of withdrawal with (except in the case of Shares tendered by an Eligible
Institution (defined in the Offer to Purchase)) signatures guaranteed by an
Eligible Institution must be submitted prior to the release of such Shares. In
addition, such notice must specify, in the case of Shares tendered by delivery
of certificates, the name of the registered holder (if different from that of
the tendering stockholder) and the serial numbers shown on the particular
certificates evidencing the Shares to be withdrawn or, in the case of Shares
tendered by book-entry transfer, the name and number of the account at the
Book-Entry Transfer Facility to be credited with the withdrawn Shares.
Withdrawals may not be rescinded, and Shares withdrawn will thereafter be deemed
not validly tendered for purposes of the Offer. However, withdrawn Shares may be
retendered by again following one of the procedures described in the Offer to
Purchase at any time prior to the expiration of the Offer.
 
                                       2
<PAGE>
    The information required to be disclosed by paragraph (e)(1)(vii) of Rule
14d-6 of the General Rules and Regulations under the Securities Exchange Act of
1934, as amended, is contained in the Offer to Purchase and is incorporated
herein by reference.
 
    The Company has provided Merger Subsidiary with the Company's stockholder
lists and security position listings for the purpose of disseminating the Offer
to holders of Shares. The Offer to Purchase and the related Letter of
Transmittal will be mailed to record holders of Shares and will be furnished to
brokers, banks and similar persons whose names, or the names of whose nominees,
appear on the stockholder list or, if applicable, who are listed as participants
in a clearing agency's security position listing for subsequent transmittal to
beneficial owners of Shares.
 
    THE OFFER TO PURCHASE AND THE RELATED LETTER OF TRANSMITTAL CONTAIN
IMPORTANT INFORMATION WHICH SHOULD BE READ BEFORE ANY DECISION IS MADE WITH
RESPECT TO THE OFFER.
 
    Requests for copies of the Offer to Purchase and the related Letter of
Transmittal and other tender offer materials may be directed to the Information
Agent as set forth below, and copies will be furnished promptly at Merger
Subsidiary's expense. No fees or commissions will be payable by Merger
Subsidiary to brokers, dealers or other persons (other than the Information
Agent) for soliciting tenders of Shares pursuant to the Offer.
 
                           The Information Agent is:
 
                            MacKenzie Partners, Inc.
 
                                156 Fifth Avenue
                            New York, New York 10010
                         (212) 929 5500 (Call Collect)
                                       or
                         Call Toll-Free (800) 322-2885
 
April 2, 1999
 
                                       3

<PAGE>

                                                                Exhibit 99(a)(9)


Contact: Doug Robinson - Investor Relations        Bob Gordon - Public Relations
         (516) 342-2745                            (516) 342-2391
         [email protected]                        [email protected]

                 COMPUTER ASSOCIATES COMMENCES TENDER OFFER FOR
                    PLATINUM TECHNOLOGY INTERNATIONAL, INC.


ISLANDIA, N.Y., April 2, 1999--Computer Associates International, Inc. (NYSE:
CA) announced that HardMetal, Inc., a wholly-owned merger subsidiary of CA,
commenced a tender offer today for all of the outstanding shares of Platinum
TECHNOLOGY International, INC. (NASDAQ: PLAT) common stock (including the
associated Rights) at a price of $29.25 per share, net to the seller in cash.

The offer is being made pursuant to the Agreement and Plan of Merger dated as of
March 29, 1999 among CA, HardMetal, Inc. and Platinum TECHNOLOGY International,
INC. ("Platinum"). It is conditioned, among other things, upon a number of
shares being tendered and not withdrawn such that, upon consummation of the
offer, CA and its affiliates will beneficially own in the aggregate not less
than a majority of the shares on a fully diluted basis. The offer will expire at
12:00 midnight, New York City time, on Thursday, April 29, 1999, unless the
offer is extended.

The Board of Directors of Platinum TECHNOLOGY International, INC. has
unanimously approved the offer and the Merger Agreement and has unanimously
recommended that stockholders of Platinum TECHNOLOGY International, Inc. accept
the offer.

The information agent for the offer is MacKenzie Partners, Inc. 156 Fifth
Avenue, New York, NY 10010, telephone (212) 929-5500 or (800) 322-2885.

PLATINUM provides software products and consulting services that help Global
10,000 companies manage and improve their IT infrastructures-including systems
and database management, e-commerce, application infrastructure management, data
warehousing, knowledge management, decision support, and year 2000
reengineering. The 12-year-old company has more than 120 offices across six
continents.

Computer Associates International, Inc. (NYSE: CA), the world leader in
mission-critical business computing, provides software, support and integration
services 


<PAGE>

in more than 100 countries around the world. CA has more than 13,000 employees
and had revenue of $5.1 billion in calendar year 1998.

For more information about CA, please call 516-342-5224 or email [email protected].
CA's World Wide Web address is www.cai.com.

All referenced product names are trademarks of their respective companies.

                                       ###

<PAGE>

                                                                  Exhibit (b)(1)


                            CREDIT SUISSE FIRST BOSTON
                               Eleven Madison Avenue
                           New York, New York 10010-3629


                                        March 30, 1999


Computer Associates International, Inc.
One Computer Associates Plaza
Islandia, New York 11788

Attention: Mr. Sanjay Kumar, President
               and Chief Operating Officer

                   Re:  Amended and Restated Commitment Letter
                        Proposed Acquisition Credit Facilities

Ladies and Gentlemen:

          You have advised Credit Suisse First Boston ("CSFB") that you 
(the "Borrower") intend to acquire (the "Acquisition") PLATINUM technology 
International Inc. (the "Target"). We understand that, in order to consummate 
the Acquisition, a wholly owned subsidiary of the Borrower ("AcquisitionCo"), 
the Borrower and the Target have entered into a merger agreement (the "Merger 
Agreement"), pursuant to which (a) AcquisitionCo will make a tender offer 
(the "Tender Offer") for up to 100% of the issued and outstanding voting 
stock of the Target (but not less than that number of shares required to 
approve a merger involving the Target) and (b) as promptly as practicable 
after the consummation of the Tender Offer, AcquisitionCo and the Target will 
merge (the "Merger"; together with the refinancing of existing debt of the 
Target contemplated hereby, the "Transaction"), such that the surviving 
entity of the Merger is a wholly owned subsidiary of the Borrower.

          You have informed CSFB that the total consideration for the 
Transaction (including transaction fees and expenses) will be approximately 
$3,500,000,000. In order to finance the Transaction and to refinance the 
Borrower's existing credit facility, the Borrower wishes to establish senior 
credit facilities in the aggregate amount of $4,500,000,000 (the "Credit 
Facilities"), and pursuant to the Commitment Letter, dated March 27, 1999, 
between the Borrower and CSFB (the "Existing Commitment Letter"). CSFB agreed 
to structure, arrange and syndicate the Credit Facilities and to provide the 
entire amount of the Credit Facilities upon and subject to the terms and 
conditions set forth therein. This letter (the "Commitment Letter") amends 
and restates the Existing Commitment Letter in its entirety.

          CSFB is pleased to inform you of its commitment to provide the 
entire $4,500,000,000 amount of the Credit Facilities and to act as advisor, 
lead arranger and book manager in respect of the Credit Facilities, in each 
case upon and subject to the terms and conditions set forth in this 
Commitment Letter and in the Statement of Terms and Conditions (the "Term 
Sheet") attached hereto as Exhibit A.

<PAGE>

          The terms and conditions of the commitments of CSFB hereunder and 
of the Credit Facilities are not limited to those set forth herein and in 
the Term Sheet, and any matters that are not covered by the provisions hereof 
and of the Term Sheet shall be subject to our mutual agreement. We shall be 
entitled, after consultation with you, to change the pricing, terms and 
structure of the Credit Facilities if the syndication has not been completed 
and if we determine that such changes are advisable to insure a successful 
syndication of the Credit Facilities; PROVIDED that the total amount of the 
Credit Facilities shall remain unchanged. CSFB's commitments and agreements 
hereunder are subject to the provisions of this paragraph.

          It is agreed that CSFB will act as the Administrative Agent, Lead 
Arranger and Book Manager for the Credit Facilities and that CSFB will, in 
such capacity, perform the duties and exercise the authority customarily 
performed and exercised by it in such role. No additional agents, co-agents, 
arrangers or book managers shall be appointed without the prior consent of 
CSFB.

          We intend to syndicate the Credit Facilities to a group of 
financial institutions (together with CSFB, the "Lenders") identified by us 
in consultation with you. We currently intend to commence syndication efforts 
promptly upon your commencement of the Tender Offer or, if earlier, the date 
upon which you enter into the Merger Agreement. You agree to assist us in 
forming any such syndicate and to provide CSFB and the other Lenders, 
promptly upon request, with all information reasonably requested by them to 
complete successfully the syndication, including, but not limited to, (a) an 
information package for delivery to potential syndicate members and 
participants (the "Information Memorandum") and (b) information and 
projections (together with the assumptions utilized in preparing such 
projections) prepared by you or your advisers relating to the transaction 
described herein. You also agree to use your best efforts to ensure that our 
syndication efforts benefit from the existing lending relationships of the 
Borrower and, to the extent practicable, the Target. You further agree to 
make appropriate senior officers and representatives of the Borrower and, to 
the extent practicable, the Target available to participate in information 
meetings for potential syndicate members and participants at such times and 
places as CSFB may reasonably request.

          You represent and warrant and covenant that:

          (a) all information (other than any financial projections 
     contemplated by clause (b) below) which has been or is hereafter made 
     available to CSFB by you or any of your representatives in connection 
     with the transaction contemplated hereby is and will be complete and 
     correct in all material respects and does not and will not contain any 
     untrue statement of a material fact or omit to state a material fact 
     necessary in order to make the statements contained therein not 
     materially misleading in light of the circumstances under which such 
     statements are made; and

          (b) all financial projections that have been or are hereafter 
     prepared by you or on your behalf and made available to CSFB or any 
     other participant in the Credit Facilities have been or will be prepared 
     in good faith based upon assumptions believed by you to have reasonable 
     when made and disclosed therein.

We recognize that changes in the Borrower, the Target and the Transaction may 
cause the representations and warranties made in clause (a) above to cease to 
be accurate. You hereby agree that you will promptly supplement the 
information and projections referred to in clauses

<PAGE>

(a) and (b) above from time to time until completion of the syndication so 
that the representations and warranties in the preceding sentence remain 
correct. In arranging and syndicating the Credit Facilities, CSFB will use 
and rely on such information and projections without independent verification 
thereof.

          In connection with the syndication of the Credit Facilities, CSFB 
may, in its discretion, allocate to other Lenders portions of any fees 
payable to it in connection with the Credit Facilities. You agree that no 
Lender will receive any compensation of any kind for its participation in the 
Credit Facilities, except as expressly provided for in this letter or as we 
shall otherwise agree.

          As consideration for CSFB's commitment and agreements hereunder, 
you agree to pay to CSFB the fees set forth in the Term Sheet and in the 
Amended and Restated Fee Letter dated the date hereof (the "Fee Letter").

          The commitment and agreements of CSFB hereunder are subject to (a) 
there not occurring or becoming known to us any material adverse condition or 
material adverse change in or affecting the business, operations, property or 
condition (financial or otherwise) of the Borrower and its subsidiaries taken 
as a whole or of the Borrower, the Target and their subsidiaries taken as 
whole, (b) there not having occurred a material disruption of or material 
adverse change in financial, banking or capital market conditions that, in or 
judgment, could materially impair the syndication of the Credit Facilities, 
(c) our satisfaction that prior to and during the syndication of the Credit 
Facilities there shall be no competing offering, placement or arrangement of 
any debt securities or bank financing by or on behalf of the Borrower, any 
affiliate or subsidiary thereof or, to the extent that you have control 
thereof, the Target or any subsidiary thereof (other than lines of credit for 
the Borrower's foreign subsidiaries arranged in the ordinary course of 
business), (d) the negotiation, execution and delivery of definitive 
documentation with respect to the Credit Facilities satisfactory to CSFB and 
its counsel on or before June 30, 1999 and, in the case of the Term Loan 
Facility (as defined in the Term Sheet) the occurrence of the initial 
borrowing remainder of the amount required to finance the Tender Offer 
(including any such borrowing to fund the Escrow Account referred to in the 
Term Sheet) on or before the date which is 270 days after such execution and 
delivery and (e) the other conditions set forth or referred to in the Term 
Sheet. Additionally, it shall be a condition to our respective commitments 
hereunder that (x) the definitive documents to be filed with the Securities 
and Exchange Commission with respect to the commencement of the Tender Offer 
shall be provided to us prior to the commencement of the Tender Offer and 
that all matters relating to the Credit Facilities and the financing of the 
Transaction shall be in form and substance reasonably acceptable to us and 
(y) we shall not be required to execute and deliver the definitive credit 
agreement prior to the date which is 20 business days after the commencement 
of our syndication efforts.

          The reasonable costs and expenses (including, without limitation, 
the fees and expenses of a single counsel to CSFB, any appropriate local 
counsel and the syndication and other out-of-pocket expenses of CSFB) arising 
in connection with the preparation, execution and delivery of this letter and 
the definitive financing agreements shall be for your account. You further 
agree to indemnify and hold harmless CSFB, each Lender and each director, 
officer, employee, affiliate and agent thereof (each, an "indemnified 
person") against, and to reimburse each indemnified person, upon its demand, 
for, any losses, claims, damages,


<PAGE>

liabilities or other expenses ("Losses") to which such indemnified person may 
become subject insofar as such Losses arise out of or in any way relate to or 
result from the Transaction, this letter or the financing contemplated 
hereby, including, without limitation, Losses consisting of legal or other 
expenses incurred in connection with investigating, defending or 
participating in any legal proceeding relating to any of the foregoing 
(whether or not such indemnified person is a party thereto); provided that 
the foregoing will not apply to any Losses to the extent they are found by a 
final decision of a court of competent jurisdiction to have resulted from 
the gross negligence or willful misconduct of, or the breach of this 
Commitment Letter by, such indemnified person. The obligations of the 
Borrower under this paragraph shall remain effective whether or not 
definitive financing documentation is executed and notwithstanding any 
termination of this letter. Neither CSFB nor any other indemnified person 
shall be responsible or liable to any other person for consequential damages 
which may be alleged as a result of this letter or the financing contemplated 
hereby and neither CSFB nor any other indemnified person shall be responsible 
or liable for any damages which may be alleged as a result of its failure, in 
accordance with the terms of this letter, to provide the Credit Facilities.

     You acknowledge that CSFB and its affiliates (the term "CSFB" being 
understood to refer hereinafter in this paragraph to include such affiliates) 
may be providing debt financing, equity capital or other services (including 
financial advisory services) to other companies in respect of which you may 
have conflicting interests regarding the transactions described herein and 
otherwise. CSFB will not use confidential information obtained from you by 
virtue of the transactions contemplated by this Commitment Letter or its 
other relationships with you in connection with the performance by CSFB of 
services for other companies, and CSFB will not furnish any such information 
to other companies. You also acknowledge that CSFB has no obligation to use 
in connection with the transactions contemplated by this Commitment Letter, 
or to furnish to you, confidential information obtained by it from other 
companies. Without prejudice to the generality of the foregoing, you 
acknowledge that CSFB is providing financial advisory services to the Target 
in connection with the transactions contemplated hereby.

     This Commitment Letter shall not be assignable by you without the prior 
written consent of CSFB (and any purported assignment without such consent 
shall be null and void), is intended to be solely for the benefit of the 
parties hereto and is not intended to confer any benefits upon, or create any 
rights in favor of, any person other than the parties hereto. This Commitment 
Letter may not be changed except pursuant to a writing signed by each of the 
parties hereto or thereto, as the case may be. This Commitment Letter may be 
executed in any number of counterparts, each of which shall constitute an 
original, and all of which, when taken together shall constitute one 
agreement. Delivery of an executed signature page of this Commitment Letter 
by facsimile transmission shall be effective as delivery of a manually 
executed counterpart hereof. THIS LETTER SHALL BE GOVERNED BY, AND CONSTRUED 
IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK.

     This Commitment Letter is delivered to you on the understanding that 
neither this Commitment Letter, the Term Sheet nor the Fee Letter nor any of 
their terms or substance, shall be disclosed, directly or indirectly, to any 
other person, except (a) to the Target, (b) to such of your employees, agents 
and advisers who are directly involved in the consideration of this matter, 
or (c) as disclosure may be compelled in a judicial or administrative 
proceeding or as otherwise required by law (in which case you agree to inform 
us promptly thereof); provided that you may freely disclose this Commitment 
Letter and the Term Sheet (but not for the Fee Letter or its terms or 
substance) at any time following your acceptance hereof and payment of the 
underwriting fee payable upon your acceptance pursuant to the Fee Letter.

<PAGE>

     The compensation, reimbursement, indemnification and confidentiality 
provisions contained herein and in the Fee Letter shall remain in full force 
and effect regardless of whether definitive financing documentation shall be 
executed and delivered and notwithstanding the termination of this Commitment 
Letter or the commitment of CSFB hereunder.


<PAGE>

     If you are in agreement with the foregoing, please sign and return to 
CSFB the enclosed copies of this Commitment Letter and the Fee Letter.


     We look forward to working with you on this transaction.

                                     Very truly yours,

                                     CREDIT SUISSE FIRST BOSTON





                                      By: /s/ Lauri A. Sivaslian
                                         -------------------------------------
                                         Name:  Lauri A. Sivaslian
                                         Title: Director





                                       By: /s/ Richard S. Carey
                                          -------------------------------------
                                          Name:  Richard S. Carey
                                          Title: Director

Accepted and agreed to as of 
the date first above written:



COMPUTER ASSOCIATES INTERNATIONAL, INC.



By: /s/ Ira H. Zar
   ------------------------
    Name:  Ira H. Zar
    Title: Chief Financial Officer
           and Senior Vice President

<PAGE>
                  $4,500,000,000 Credit Facilities

                  STATEMENT OF TERMS AND CONDITIONS

                           March 30, 1999

Computer Associates International, Inc., a Delaware corporation (the "Borrower")
intends to acquire (the "Acquisition") First Boston (the "Target"). In order 
to consummate the Acquisition, a wholly owned subsidiary of the Borrower 
("AcquisitionCo"), the Borrower and the Target have entered into a merger 
agreement (the "Merger Agreement") with the Target, pursuant to which (a) 
AcquisitionCo will make a tender offer (the "Tender Offer") for up to 100% of 
the issued and outstanding voting stock of the Target (but not less than that 
number of shares required to approve a merger involving the Target) and (b) 
as promptly as practicable after the consummation of the Tender Offer, 
AcquisitionCo and the Target will merge (the "Merger"; together with the 
refinancing of existing debt of the Target contemplated hereby, the 
"Transaction"), such that the surviving entity of the Merger is a wholly 
owned subsidiary of the Borrower. The total consideration for the Transaction 
(including transaction fees and expenses) will be approximately 
$3,500,000,000. In order to finance the Transaction and to refinance the 
Borrower's existing credit facility, the Borrower wishes to establish senior 
credit facilities in the aggregate amount of $4,500,000,000 (the "Credit 
Facility"). Set forth below is a statement of the terms and conditions for 
the Credit Facilities:

<TABLE>
<S>                            <C>

I.   PARTIES.

Borrower.                      Computer Associates International, Inc., a Delaware 
                               corporation (the "Borrower").

Lead Arranger and
Book Manager.                  Credit Suisse First Boston (in such capacity, the "Arranger").

Administrative Agent           Credit Suisse First Boston (in such capacity, the 
                               "Administrative Agent").

Lenders:                       A syndicate of banks, financial institutions and other 
                               entities, including CSFB collectively, the "Lenders"), 
                               arranged by the Arranger.

II.  TYPE AND AMOUNT OF CREDIT FACILITIES

  1. TERM LOAN FACILITY

Type of Facility:              4-year senior, term loan facility in the amount of 
                               $2,000,000,000 (the "Term Loan Facility").

Availability:                  The Term Loan Facility shall be available in two drawings, 
                               with the first such drawing to occur on the Initial Tender 
                               Funding Date (as defined below), and the second drawing to 
                               occur on the date (which shall be not later than 180 days

</TABLE>

<PAGE>

<TABLE>
<S>                            <C>

                               after the date on which the Tender Offer is consummated) upon 
                               which the Merger is consummated.

Amortization:                  The Term Loan Facility shall amortize according to a schedule 
                               to be agreed upon, with the final installment being payable on 
                               the date which is 4 years after the date (the "Closing Date") 
                               on which the definitive documentation in respect of the Credit 
                               Facilities (the "Credit Documentation") is signed and the 
                               conditions precedent to the initial borrowing under the 
                               364-Day Revolving Credit Facility are satisfied.

Use of Proceeds:               The proceeds of the Term Loan Facility may only be applied to 
                               (a) in the case of the initial drawing, (i) finance the 
                               consideration to be paid in connection with the Tender Offer 
                               (or, as the case may be, to finance amounts to be deposited in 
                               the Escrow Account described below), (ii) refinance certain 
                               outstanding indebtedness of the Borrower and its respective 
                               subsidiaries and (iii) pay fees and expenses relating thereto 
                               and (b) in the case of the second drawing, (i) finance the 
                               consideration to be paid to shareholders upon the consummation 
                               of the Merger and (ii) refinance certain outstanding 
                               indebtedness of the Target and its subsidiaries.

                               Subject to the terms and conditions set forth below, prior to 
                               the closing of the Tender Offer, the Borrower may borrow 
                               amounts required to fund the Tender Offer and deposit such 
                               amounts in the Escrow Account pending consummation of the 
                               Tender Offer.

2. FOUR YEAR REVOLVING CREDIT FACILITY

Type of Facility:              4-year senior, revolving credit facility in the amount of 
                               $1,000,000,000 (the "Four Year Revolving Credit Termination 
                               Date").

Availability:                  The Four Year Revolving Credit Facility shall be available on 
                               a revolving basis during the period commencing on the Closing 
                               Date and ending on the fourth anniversary of the Closing Date 
                               (the "Four Year Revolving Credit Termination Date").

Letters of Credit:             A portion of the Four Year Revolving Credit Facility to be 
                               mutually agreed upon by the Borrower and the Administrative 
                               Agent shall be available for the issuance of letters of credit 
                               (the "Letters of Credit") by Credit Suisse First Boston or 
                               such other Lender as may be mutually agreed upon by the 
                               Borrower and the Administrative Agent (the "Issuing Lender"). 
                               No Letter of Credit shall have an expiration date after the 
                               date which is five

</TABLE>

<PAGE>

<TABLE>
<S>                            <C>

                               business days prior to the Four Year Revolving Credit 
                               Termination Date. Drawings under any Letter of Credit shall be 
                               reimbursed by the Borrower (whether with its own funds or with 
                               the proceeds of loans under the Four Year Revolving Credit 
                               Facility) on the same business day. To the extent that the 
                               Borrower does not so reimburse the Issuing Lender, the Lenders 
                               under the Four Year Revolving Credit Facility shall be 
                               irrevocably and unconditionally obligated to reimburse the 
                               Issuing Lender on a PRO RATA basis.

Swing Line Loans:                 A portion of the Four Year Revolving Credit Facility not in 
                               excess of $25,000,000 million shall be available for swing 
                               line loans (the "Swing Line Loans") from Credit Suisse First 
                               Boston on same-day notice. Any such Swing Line Loans will 
                               reduce availability under the Four Year Revolving Credit 
                               Facility (other than for purposes of determining the 
                               commitment fee) on a dollar-for-dollar basis. Each Lender 
                               under the Four Year Revolving Credit Facility shall acquire, 
                               under certain circumstances, an irrevocable and unconditional 
                               PRO RATA participation in each such Swing Line Loan.

Maturity:                      The Four Year Revolving Credit Termination Date.

Purpose:                       The proceeds of the loans under the Four Year Revolving Credit 
                               Facility shall be used by the Borrower and its subsidiaries 
                               for working capital and other general corporate purposes 
                               (including, without limitation, for the same purposes as the 
                               Term Loan Facility).

3.  364-DAY REVOLVING CREDIT FACILITY

Type of Facility:              364-day senior, revolving credit facility in the amount of 
                               $1,500,000,000 (the "364-Day Revolving Credit Facility"; 
                               together with the Term Loan Facility and the Four Year 
                               Revolving Credit Facility, the "Credit Facilities").

Availability:                  The 364-Day Revolving Credit Facility shall be available on a 
                               revolving basis during the period commencing on the Closing 
                               Date and ending on the date which is 364 days thereafter (the 
                               "364-Day Revolving Credit Termination Date").

Maturity:                      The 364-Day Revolving Credit Termination Date.

Purpose:                       The proceeds of the loans under the 364-Day Revolving Credit 
                               Facility shall be used by the Borrower and its subsidiaries 
                               for working capital and other general

</TABLE>






<PAGE>

                                                                            4

 
<TABLE>
<S>                            <C>

                               corporate purposes (including, without limitation, for the 
                               same purposes as the Term Loan Facility).

III.  GENERAL PROVISIONS.

Interest Rate Options:         The Borrower may elect that all or a portion of the loans 
                               under the Credit Facilities (collectively, the "LOANS"), bear 
                               interest at a rate per annum equal to:

                               (a)  The higher of (1) the rate of interest publicly announced 
                                    by Credit Suisse First Boston as its base lending rate 
                                    for commercial loans in US Dollars in the United States 
                                    and (2) the federal funds rate from time to time plus 
                                    0.5% (such highest rate, the "BASE RATE"; the base 
                                    lending rate is not intended to be the lowest rate 
                                    charged by Credit Suisse First Boston to its borrowers) 
                                    plus the Applicable Margin (as hereinafter defined) which 
                                    is then in effect; or

                               (b)  The rate (grossed-up for maximum statutory reserve 
                                    requirements for eurodollar liabilities) reflected on the 
                                    Telerate service (other similar service) as the "British 
                                    Bankers' Association Settlement Rate" for eurodollar 
                                    deposits for one, two, three, six, nine or twelve (as 
                                    selected by the Borrower) (the "EURODOLLAR RATE") plus 
                                    the Applicable Margin which is then in effect.

                               For purposes hereof, the "APPLICABLE MARGIN" shall be 
                               determined in accordance with the ratings grid attached to 
                               this Term Sheet as Annex A.

Interest Payment Dates:        In the case of loans bearing interest based upon the Base Rate 
                               ("BASE RATE LOANS"), in arrears on the last business day of 
                               each calendar quarter.

                               In the case of loans bearing interest based upon the 
                               Eurodollar Rate ("EURODOLLAR LOANS"), on the last day of each 
                               relevant interest period and, in the case of any interest 
                               period longer than three months, on each successive date three 
                               months after the first day of such interest period.

                               In addition, any payment of principal of Loans (other than of 
                               Loans under the Four Year Revolving Credit Facility and the 
                               364-Day Revolving Credit Facility) shall be accompanied by 
                               interest then owing on the amount so paid. 
</TABLE>

<PAGE>

                                                                            5

 
<TABLE>
<S>                            <C>

Letter of Credit Fees:         The Borrower shall pay a commission on all outstanding Letters 
                               of Credit at a per annum rate equal to the Applicable Margin 
                               then in effect with respect to Eurodollar Loans under the Four 
                               Year Revolving Credit Facility on the face amount of each such 
                               Letter of Credit. Such commission shall be shared ratably 
                               among the Lenders participating in the Four Year Revolving 
                               Credit Facility and shall be payable quarterly in arrears.

                               A fronting fee equal to 1/4 of 1% per annum on the face amount 
                               of each Letter of Credit shall be payable quarterly in arrears 
                               to the Issuing Lender for its own account. In addition, 
                               customary administrative, issuance, amendment, payment and 
                               negotiation charges shall be payable to the Issuing Lender for 
                               its own account.

Default Rate:                  During the continuance of an Event of Default, outstanding 
                               Loans will bear interest at the rate which is 2% over the rate 
                               otherwise applicable thereto.

Reserve Requirements;
Yield Protection:              The rate quoted as the Eurodollar Rate will be grossed-up for 
                               the maximum reserve requirements prescribed for eurocurrency 
                               liabilities. In addition, the financing agreements will contain 
                               customary provisions relating to increased costs, capital 
                               adequacy protection, withholding and other taxes and 
                               illegality.

Facility Fee:                  The Borrower shall pay a facility fee quarterly, in arrears, 
                               on the average daily amount (drawn and undrawn) of the Credit 
                               Facilities. Such facility fee shall accrue at the rate 
                               determined in accordance with ratings grid attached to this 
                               Term Sheet as Annex A.

Rate and Fee Basis:            360 days for actual days elapsed, in the case of calculation 
                               of the Eurodollar Rate and any rate based upon the Federal 
                               Funds Rate; otherwise, 365/6 days for actual days elapsed.

Mandatory Prepayment:          In the event that amounts deposited in the Escrow Account are 
                               returned to the Borrower, any amount thereof in excess of the 
                               amount required to pay consideration in respect of the Merger 
                               shall be applied to prepay the Term Loans.

Optional Prepayments and
Commitment Reductions:         Loans may be prepaid and commitments may be reduced by the 
                               Borrower without premium or penalty (but subject to Eurodollar 
                               breakage indemnities), in minimum amounts to be agreed upon.

</TABLE>

<PAGE>

                                                                            6
 
<TABLE>
<S>                            <C>

IV. CERTAIN CONDITIONS

Conditions Precedent to
Closing Date and Initial
Borrowing under the 364-Day

Revolving Credit Facility:     The occurrence of the Closing Date and the availability of the 
                               364-Day Revolving Credit Facility shall be conditioned upon 
                               satisfaction of, among other things, the following conditions 
                               precedent on or before June 30, 1999:

                               (a) The Borrower shall have executed and delivered definitive 
                               financing documentation with respect to the Credit Facilities 
                               (the "CREDIT DOCUMENTATION") satisfactory to the 
                               Administrative Agent.

                               (b) The Lenders, the Arranger and the Administrative Agent 
                               shall have received all fees required to be paid, and all 
                               expenses for which invoices have been presented, on or before 
                               the Closing Date.

                               (c) All governmental and third party approvals, if any, 
                               necessary or reasonably requested by the Administrative Agent 
                               in connection with the Credit Facilities (excluding 
                               Hart-Scott-Rodino approvals and other approvals necessary in 
                               connection with the Acquisition) shall have been obtained and 
                               be in full force and effect. The Lenders shall be satisfied 
                               that the consummation of the Tender Offer and the financing 
                               thereof does not violate Regulations T, U or X of the Board of 
                               Governors of the Federal Reserve System.

                               (d) The Lenders shall have received (i) audited consolidated 
                               financial statements of the Borrower and the Target for the 
                               three most recent fiscal years ended prior to the Closing Date 
                               as to which such financial statements are available and (ii) 
                               satisfactory unaudited interim consolidated financial 
                               statements of the Borrower and the Target for each quarterly 
                               period ended subsequent to the date of the latest financial 
                               statements delivered pursuant to clause (i) of this paragraph 
                               as to which such financial statements are available.

                               (e) The Lenders shall have received a satisfactory PRO FORMA 
                               consolidated balance sheet of the Borrower as at the date of 
                               the most recent consolidated balance sheet delivered pursuant 
                               to the immediately preceding paragraph, adjusted to give 
                               effect to the consummation of

</TABLE>

<PAGE>
 
<TABLE>
<S>                            <C>
                               the Transaction and the financings contemplated hereby as if
                               such transactions had occurred on such date.

                               (f) the Lenders shall have received a business plan for each
                               year prior to the final maturity of the Term Loan Facility
                               and a written analysis of the business and prospects of the
                               Borrower and its subsidiaries for the period from the
                               Closing Date through the final maturity of the Term Loan
                               Facility, each in form and substance reasonably satisfactory
                               to the Administrative Agent.

                               (g) The Lenders shall have received such legal opinions
                               (including opinions (i) from independent counsel to the
                               Borrower and its subsidiaries and (ii) from such special and 
                               local counsel as may be required by the Administrative Agent), 
                               documents and other instruments as are customary for 
                               transactions of this type or as they may reasonably request.

                               (h) All material existing credit facilities (subject to
                               exceptions to be mutually agreed upon) of the Borrower and
                               its subsidiaries shall have been paid in full and
                               terminated.

Conditions Precedent to
  Initial Tender Funding Date  The availability of Loans under the Term Loan Facility and
                               the Four Year Revolving Credit Facility, the proceeds of
                               which will be used to fund payments to be made under the
                               Tender Offer (or to fund amounts to be deposited in the
                               Escrow Account pending consummation of the Tender Offer, as
                               the case may be) shall be conditioned upon satisfaction of
                               the following conditions precedent on or before the date
                               which is 270 days after the Closing Date (the date of
                               satisfaction of such conditions and the initial borrowing
                               conditioned thereon, the "INITIAL TENDER FUNDING DATE"):

                               (a) The Closing Date shall have occurred.

                               (b) In the case of a borrowing to fund amounts to be
                               deposited in the Escrow Account, the Borrower and the Target
                               shall have entered into an escrow agreement reasonably
                               satisfactory to the Administrative Agent with an escrow
                               agent reasonably satisfactory to the Administrative Agent
                               pursuant to which (i) an account (the "ESCROW ACCOUNT") will
                               be established and (ii) amounts on deposit in the Escrow
                               Account will be released to pay amounts payable in the
                               Tender Offer, or will be returned to the Borrower.
</TABLE>
<PAGE>
<TABLE>
<S>                            <C>
                               (c) The Tender Offer shall have been made in accordance with
                               applicable law.

                               (d) The Board of Directors of Target (consisting of a
                               majority of the Directors holding office as of the date
                               hereof) shall have approved the Tender Offer prior to the
                               commencement thereof and shall have recommended to the
                               shareholders of Target the acceptance of the Tender Offer,
                               and such approval and recommendation shall not have been
                               withdrawn.

                               (e) The Merger Agreement, including the Disclosure Schedules
                               thereto, shall have been entered into in form and substance
                               reasonably satisfactory to the Administrative Agent; in the
                               case of Loans made to fund the Tender Offer (rather than
                               deposits in the Escrow Account), the Tender Offer shall have
                               been, or concurrently with the making of the Loans to be
                               made on the Initial Tender Funding Date shall be,
                               consummated pursuant to the Merger Agreement; and the Merger
                               Agreement shall not have been amended, supplemented, waived
                               or otherwise modified in any respect materially adverse to
                               the interests of the Lenders, without the prior written
                               consent of the Administrative Agent.

                               (f) AcquisitionCo. shall have accepted for payment (in the
                               case of Loans used to fund the Tender Offer, rather than
                               deposits in the Escrow Account) concurrently with the making
                               of the Loans on the Initial Tender Funding Date, not less
                               than that number of outstanding shares of common stock of
                               the Target required to approve the Merger.

                               (g) The documents and materials filed publicly by the
                               Borrower and AcquisitionCo. in connection with the Tender
                               Offer and the Merger shall have been furnished to the
                               Administrative Agent and shall be reasonably satisfactory
                               in form and substance to the Administrative Agent.

                               (h) There shall have been no material change in the capital
                               stock of the Target outstanding; and any stock purchase
                               rights or other "poison pill" rights of the Target shall
                               have been redeemed by the Board of Directors of the Target
                               or the Lenders shall be satisfied that they have been
                               invalidated or otherwise will not be triggered.

                               (i) The Lenders shall have received such legal opinions,
                               documents and other instruments as are customary for
</TABLE>
<PAGE>
<TABLE>
<S>                            <C>
                               transactions of this type or as they may reasonably request.

Conditions Precedent to
  Availability of Four Year
  Revolving Credit Facility:   The availability of the Four Year Revolving Credit Facility
                               shall be conditioned upon satisfaction of the following
                               conditions precedent:

                               (a) The Closing Date shall have occurred.

                               (b) In the case of any Loan under the Four Year Revolving
                               Credit Facility to fund the Tender Offer, to fund deposits
                               in the Escrow Account or to fund the Merger, the Initial
                               Tender Funding Date shall have occurred.

Conditions Precedent to Loans
  to fund the Tender Offer
  (rather than deposits in
  the Escrow Account) and
  Loans to be made on the
  date of the Merger:          The availability of the Credit Facilities to fund the Tender
                               Offer (rather than deposits in the Escrow Account) or to
                               fund the consideration for the Merger shall be conditioned
                               upon satisfaction of the following conditions precedent:

                               (a) The Closing Date and the Initial Tender Funding Date
                               shall have occurred or shall occur simultaneously therewith.

                               (b) There shall not be in effect any injunction, restraining
                               order or other order of any competent governmental authority
                               purporting to prohibit the consummation of the Tender Offer
                               or the Merger.

Conditions Precedent to All
  Advances:                    The making of each extension of credit (including, without
                               limitation, the initial extension of credit) shall be
                               conditioned upon (a) all representations and warranties in
                               the Credit Documentation (including, without limitation, the
                               material adverse change and litigation representations)
                               being true and correct in all material respects and (b)
                               there being no default or event of default in existence at
                               the time of, or after giving effect to the making of, such
                               extension of credit.

                               As used herein and in the Credit Documentation a "material
                               adverse change" shall mean any event, development or
                               circumstance that has had or could reasonably be expected to
                               have a material adverse effect
</TABLE>
<PAGE>
 
<TABLE>
<S>                            <C>
                               on (a) the Transaction, (b) the business, assets, property
                               or condition (financial or otherwise) of the Borrower and
                               its subsidiaries taken as a whole or of the Borrower, the
                               Target and their subsidiaries taken as a whole or (c) the
                               validity of enforceability of any of the Credit
                               Documentation or the rights and remedies of the Admin-
                               istrative Agent and the Lenders thereunder.

V. REPRESENTATIONS,
   WARRANTIES, COVENANTS AND
   EVENTS OF DEFAULT

The Credit Documentation shall contain representations, warranties, covenants and events of
  default customary for financings of this type and other terms deemed appropriate by the
  Lenders, including, without limitation:

Representations and
  Warranties:                  Substantially the same as in the Borrower's existing credit
                               agreement under which Credit Suisse First Boston is
                               administrative agent (the "EXISTING CREDIT AGREEMENT"), and
                               others usual and customary for transactions of this type.

Affirmative Covenants:         Substantially the same as in the Existing Credit Agreement,
                               and others usual and customary for transactions of this
                               type.

Financial Covenants:           Minimum interest coverage ratio and maximum leverage ratio
                               (in each case with definitions and levels to be mutually
                               agreed upon by the Borrower and the Administrative Agent).

Negative Covenants:            Substantially the same as in the Existing Credit Agreement,
                               and others usual and customary for transactions of this
                               type, including a covenant not to reduce the minimum
                               acceptance condition in the Tender Offer without the consent
                               of the Administrative Agent.

Events of Default:             Substantially the same as in the Existing Credit Agreement,
                               and others usual and customary for transactions of this type.
VI. CERTAIN OTHER TERMS.

Voting:                        Amendments and waivers with respect to the Credit
                               Documentation shall require the approval of Lenders holding
                               not less than a majority of the aggregate amount of the
                               Credit Facilities, except that (a) the consent of each
                               Lender directly affected thereby shall be required with
                               respect to (i) reductions in the amount, or extensions of
                               the scheduled date of any scheduled installment or the final
</TABLE>
<PAGE>
<TABLE>
<S>                            <C>
                               maturity, of any Loan, (ii) reductions in the rate of
                               interest or any fee or extensions of any due date thereof,
                               (iii) increases in the amount or extensions of the expiry
                               date of any Lender's commitment and (iv) modifications to
                               the pro rata provisions of the Credit Documentation and (b)
                               the consent of all Lenders shall be required with respect to
                               modifications to any of the voting percentages.

Assignments and
  Participations:              The Lenders shall be permitted to assign and sell
                               participations in their Loans and commitments, subject, in
                               the case of assignments (other than to another Lender or to
                               an affiliate of a Lender), to the consent of the
                               Administrative Agent and the Borrower (which consent in each
                               case shall not be unreasonably withheld) and to the payment
                               to the Administrative Agent of a $3,500 registration and
                               processing fee. Non-pro rata assignments shall be permitted.
                               In the case of partial assignments (other than to another
                               Lender or to an affiliate of a Lender), the minimum
                               assignment amount shall be $5.0 million unless otherwise
                               agreed by the Borrower and the Administrative Agent.
                               Participants shall have the same benefits as the Lenders
                               with respect to yield protection and increased cost pro-
                               visions. Voting rights of participants shall be limited to
                               those matters with respect to which the affirmative vote of
                               the Lender form which it purchased its participation would
                               be required as described under "Voting" above. Pledges of
                               Loans in accordance with applicable law shall be permitted
                               without restriction. Promissory notes shall be issued under
                               the Credit Facilities only upon request of the relevant
                               Lender the will be provided 45 days after the Closing Date.

Yield Protection:              The Credit Documentation shall contain customary provisions
                               (a) protecting the Lenders against increased costs or loss
                               of yield resulting from changes in reserve, tax, capital
                               adequacy and other requirements of law and from the
                               imposition of or changes in withholding or other taxes and
                               (b) indemnifying the Lenders for "breakage costs" incurred
                               in connection with, among other things, any prepayment of a
                               Eurodollar Loan on a day other than the last day of an
                               interest period with respect thereto.

Expenses and Indemnification   The Borrower shall pay (a) all reasonable out-of-pocket
                               expenses of the Administration Agent associated with the
                               syndication of the Credit Facilities and the preparation,
                               execution and delivery of the Credit Documentation and any
                               amendment or waiver with respect thereto (including the
                               reasonable fees, disbursements and other charges of a
</TABLE>
<PAGE>
<TABLE>
<S>                            <C>
                               single counsel to the Administrative Agent and any necessary
                               local counsel) and (b) all out-of-pocket expenses of the
                               Administrative Agent and the Lenders (including the fees,
                               disbursements and other charges of counsel) in connection
                               with the enforcement of the Credit Documentation.

                               The Administrative Agent, the Arranger and the Lenders (and
                               their affiliates and their respective officers, directors,
                               employees, advisors and agents) will have no liability for
                               and will be indemnified and held harmless against, any loss,
                               liability, cost or expense incurred in respect of the
                               financing contemplated hereby or the use or the proposed use
                               of proceeds thereof (except to the extent resulting from the
                               gross negligence or willful misconduct of the indemnified
                               party).

Confidentiality:               No Lender shall disclose non-public information provided to
                               it pursuant to the credit documents which has been marked
                               "confidential".

Governing Law and Forum        State of New York (including submission to New 
                               York jurisdiction and waiver of jury trial).

Counsel to the Administrative
  Agent and the Arranger:      Simpson Thacher & Bartlett
</TABLE>
<PAGE>
                                                                         ANNEX A
 
                  INTEREST RATE MARGINS AND FACILITY FEE RATES
 
                            (BASIC POINTS PER ANNUM)
<TABLE>
<CAPTION>
- ---------------------------------------------------------------------------------------------------- 
                              TERM LOAN FACILITY AND                                                 
                               FOUR YEAR REVOLVING                      364-DAY REVOLVING            
                                 CREDIT FACILITY                         CREDIT FACILITY             
                      --------------------------------------  -------------------------------------- 
PUBLIC DEBT RATINGS   BASE RATE    EURODOLLAR                 BASE RATE    EURODOLLAR                
    S&P/MOODY'S         MARGIN       MARGIN     FACILITY FEE    MARGIN       MARGIN     FACILITY FEE 
- --------------------  ----------   ----------   ------------  ----------   ----------   ------------ 
<S>                   <C>          <C>          <C>           <C>          <C>          <C>          

A-/A3...............       0          60.0          15.0           0          65.0          10.0     
- ---------------------------------------------------------------------------------------------------- 

BBB+/Baa1...........       0          70.0          17.5           0          75.0          12.5     
- ---------------------------------------------------------------------------------------------------- 

BBB/Baa2............       0          80.0          20.0           0          85.0          15.0     
- ---------------------------------------------------------------------------------------------------- 

BBB-/Baa3...........       0         102.5          22.5           0         107.5          17.5     
- ---------------------------------------------------------------------------------------------------- 

LESS THAN                                                                                            
  BBB-/Baa3.........       0         120.0          30.0           0         130.0          20.0     
- ---------------------------------------------------------------------------------------------------- 
</TABLE>
 
Pricing will be determined based upon the higher of the ratings from S&P or
Moody's, but in the event the Borrower's ratings are more than one level apart,
the pricing will be determined by using the rating which is one level above the
lower rating, unless the lower such level is BBB- or below or Baa3 or below, in
which case the pricing will be determined based on the lower level.
 
Notwithstanding the foregoing,the pricing for the first six months following the
Closing Date will be (a) in the case of the Term Loan Facility and the Four Year
Revolving Credit Facility, a Eurodollar Margin of 80 basis points and a Facility
Fee rate of 20 basis points and (b) in the case of the 364-Day Revolving Credit
Facility, a Eurodollar Margin of 85 basis points and a Facility Fee rate of 15
basis points.



<PAGE>

                                                                Exhibit 99(c)(1)
- --------------------------------------------------------------------------------








                          AGREEMENT AND PLAN OF MERGER



                           Dated as of March 29, 1999



                                      among



                    Computer Associates International, inc.,



                                 HardMetal, Inc.



                                       and



                     PLATINUM Technology International, Inc.








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




<PAGE>


                                                  TABLE OF CONTENTS
<TABLE>
<CAPTION>

                                                                                                               PAGE


                                                    ARTICLE I

                                                     THE OFFER

<S>                                                                                                              <C>
  SECTION 1.1.  The Offer.........................................................................................1
  SECTION 1.2.  Company Action....................................................................................2
  SECTION 1.3.  Directors.........................................................................................3


                                                   ARTICLE II

                                                   THE MERGER

  SECTION 2.1.  The Merger........................................................................................3
  SECTION 2.2.  Conversion of Shares..............................................................................4
  SECTION 2.3.  Surrender and Payment.............................................................................4
  SECTION 2.4.  Dissenting Shares.................................................................................5
  SECTION 2.5.  Stock Options.....................................................................................6


                                                   ARTICLE III

                                             THE SURVIVING CORPORATION

  SECTION 3.1.  Certificate of Incorporation......................................................................7
  SECTION 3.2.  Bylaws............................................................................................7
  SECTION 3.3.  Directors and Officers............................................................................7


                                                   ARTICLE IV

                                          REPRESENTATIONS AND WARRANTIES

  SECTION 4.1.  Representations and Warranties of the Company.....................................................7

      (a)  Organization, Standing and Corporate Power.............................................................7
      (b)  Subsidiaries...........................................................................................8
      (c)  Capital Structure......................................................................................8

</TABLE>

                                      -i-

<PAGE>
<TABLE>
<CAPTION>
                                                                                                                 PAGE
   <S>                                                                                                           <C>
      (d)  Authority; Noncontravention............................................................................9
      (e)  SEC Documents; Financial Statements; No Undisclosed Liabilities.......................................10
      (f)  Disclosure Documents..................................................................................11
      (g)  Absence of Certain Changes or Events..................................................................11
      (h)  Litigation............................................................................................12
      (i)  Absence of Changes in Stock and Benefit Plans; Severance Benefits.....................................13
      (j)  Participation and Coverage in Benefit Plan............................................................13
      (k)  ERISA Compliance......................................................................................13
      (l)  Taxes.................................................................................................14
      (m)  State Takeover Statutes...............................................................................15
      (n)  Brokers; Schedule of Fees and Expenses................................................................16
      (o)  Permits; Compliance with Laws; Environmental Matters..................................................16
      (p)  Contracts; Debt Instruments...........................................................................17
      (q)  Opinion of Financial Advisor..........................................................................18
      (r)  Interests of Officers and Directors...................................................................18
      (s)  Technology............................................................................................19
      (t)  Change of Control.....................................................................................19
      (u)  Rights Agreement......................................................................................20
      (v)  1999 Options..........................................................................................20
      (w)  Year 2000 Compliance..................................................................................20

  SECTION 4.2.  Representations and Warranties of Parent and Merger Subsidiary...................................20

      (a)  Organization, Standing and Corporate Power............................................................20
      (b)  Authority; Noncontravention...........................................................................20
      (c)  Disclosure Documents..................................................................................21
      (d)  Financing.............................................................................................22
      (e)  Delaware Law..........................................................................................22


                                                    ARTICLE V

                                             COVENANTS OF THE COMPANY

  SECTION 5.1.  Conduct of Business..............................................................................22
  SECTION 5.2.  Stockholder Meeting; Proxy Material..............................................................24
  SECTION 5.3.  Access to Information............................................................................24
  SECTION 5.4.  Other Offers.....................................................................................24
  SECTION 5.5.  State Takeover Statutes..........................................................................25
</TABLE>

                                     - ii-
<PAGE>
<TABLE>
<CAPTION>
                                                                                                                PAGE

                                                   ARTICLE VI

                                     COVENANTS OF PARENT AND MERGER SUBSIDIARY

<S>                                                                                                             <C>
  SECTION 6.1.  Obligations of Merger Subsidiary.................................................................25
  SECTION 6.2.  Voting of Shares.................................................................................25
  SECTION 6.3.  Indemnification..................................................................................26
  SECTION 6.4.  Employees........................................................................................26
  SECTION 6.5.  Interim Financing................................................................................26


                                                   ARTICLE VII

                                               ADDITIONAL AGREEMENTS

  SECTION 7.1.  HSR Act Filings; Reasonable Efforts; Notification................................................27
  SECTION 7.2.  Public Announcements.............................................................................30
  SECTION 7.3.  Rights Agreement.................................................................................30


                                                  ARTICLE VIII

                                             CONDITIONS TO THE MERGER

  SECTION 8.1.  Conditions to the Obligations of Each Party......................................................30


                                                   ARTICLE IX

                                                  TERMINATION

  SECTION 9.1.  Termination......................................................................................31
  SECTION 9.2.  Effect of Termination............................................................................31


                                                    ARTICLE X

                                                GENERAL PROVISIONS

  SECTION 10.1.  Nonsurvival of Representations and Warranties...................................................32
  SECTION 10.2.  Notices.........................................................................................32
</TABLE>



                                      -iii-
<PAGE>
<TABLE>
<CAPTION>
                                                                                                                PAGE
<S>                                                                                                             <C>
  SECTION 10.3.  Amendments; No Waivers..........................................................................33
  SECTION 10.4.  Fees and Expenses...............................................................................33
  SECTION 10.5.  Successors and Assigns..........................................................................34
  SECTION 10.6.  Governing Law...................................................................................34
  SECTION 10.7.  Counterparts; Effectiveness; Interpretation.....................................................34
  SECTION 10.8.  Enforcement.....................................................................................35
  SECTION 10.9.  Severability....................................................................................35
  SECTION 10.10  Entire Agreement; No Third Party Beneficiaries..................................................35
  SECTION 10.11.  Materiality; Knowledge.........................................................................35

  ANNEXES

  I      Conditions to the Offer
  II     Form of Amended and Restated Charter of the Surviving Corporation
  III    Escrow Terms
</TABLE>




                                      -iv-
<PAGE>


                  AGREEMENT AND PLAN OF MERGER dated as of March 29, 1999 among
                  Computer Associates International, Inc., a Delaware
                  corporation ("PARENT"), HardMetal, Inc., a Delaware
                  corporation and a wholly owned subsidiary of Parent ("MERGER
                  SUBSIDIARY"), and PLATINUM TECHNOLOGY International, INC., a
                  Delaware corporation (the "COMPANY").


                  The parties agree as follows:


                                  ARTICLE I

                                  THE OFFER


                  SECTION 1.1. THE OFFER. (a) Merger Subsidiary shall, as
promptly as practicable after the date hereof, but in no event later than five
business days following the public announcement of the terms of this Agreement,
commence an offer (the "OFFER") to purchase all of the outstanding shares of
common stock, par value $.001 per share (the "SHARES"), including the associated
Rights (defined in Section 4.1(c)), of the Company at a price of $29.25 per
Share (including the associated Right), net to the seller in cash. The Offer
shall be subject to the condition that there shall be validly tendered in
accordance with the terms of the Offer prior to the expiration date of the Offer
and not withdrawn a number of Shares which, together with the Shares then owned
by Parent and Merger Subsidiary, represents at least a majority of the total
number of outstanding Shares, assuming the exercise of all outstanding options,
rights and convertible securities (if any) and the issuance of all Shares that
the Company is obligated to issue (such total number of outstanding Shares being
hereinafter referred to as the "FULLY DILUTED SHARES") (the "MINIMUM CONDITION")
and to the other conditions set forth in Annex I hereto. Parent and Merger
Subsidiary expressly reserve the right to waive the conditions to the Offer and
to make any change in the terms or conditions of the Offer; PROVIDED that,
without the written consent of the Company, no change may be made which changes
the form of consideration to be paid, decreases the price per Share or the
number of Shares sought in the Offer, imposes conditions to the Offer in
addition to those set forth in Annex I, changes or waives the Minimum Condition,
extends the Offer (except as set forth in the following sentence), or makes any
other change to any condition to the Offer set forth in Annex I which is adverse
to the holders of Shares. Subject to the terms of the Offer in this Agreement
and the satisfaction (or waiver to the extent permitted by this Agreement) of
the conditions to the Offer, Merger Subsidiary shall accept for payment all
Shares validly tendered and not withdrawn pursuant to the Offer as soon as
practicable after the applicable expiration date of the Offer and shall pay for
all such Shares promptly after acceptance; PROVIDED that Merger Subsidiary may
(or, if the conditions set forth in clauses (a), (b), (c), (d) and (i) of Annex
I exist, shall) extend the Offer if, at the scheduled expiration date of the
Offer or any extension thereof any of the conditions to the Offer shall not have
been satisfied, until such time as such conditions are satisfied or waived, and
Merger Subsidiary may extend the Offer for a further period of time of not more
than 20 business days to meet the objective (which is not a condition to the
Offer) that there be validly tendered, in accordance with the terms of the
Offer, prior to the expiration date of the Offer (as so extended) and not
withdrawn a number of Shares, which together with Shares then owned by Parent
and Merger Subsidiary, represents at least 90% of the Fully Diluted Shares.

                                      
<PAGE>

                  (b) As soon as practicable on the date of commencement of the
Offer, Parent and Merger Subsidiary shall (i) file with the SEC (defined below
in Section 4.1(a)) a Tender Offer Statement on Schedule 14D-l with respect to
the Offer which will contain the offer to purchase and form of the related
letter of transmittal (together with any supplements or amendments thereto,
collectively the "OFFER DOCUMENTS") and (ii) cause the Offer Documents to be
disseminated to holders of Shares. Parent, Merger Subsidiary and the Company
each agree promptly to correct any information provided by it for use in the
Offer Documents if and to the extent that it shall have become false or
misleading in any material respect. Parent and Merger Subsidiary agree to take
all steps necessary to cause the Offer Documents as so corrected to be filed
with the SEC and to be disseminated to holders of Shares, in each case as and to
the extent required by applicable federal securities laws. The Company and its
counsel shall be given a reasonable opportunity to review and comment on the
Schedule 14D-l prior to its being filed with the SEC.

                  SECTION 1.2. COMPANY ACTION. (a) The Company hereby consents
to the Offer and represents that its Board of Directors, at a meeting duly
called and held, has unanimously (i) determined that this Agreement and the
transactions contemplated hereby, including the Offer and the Merger (defined
below in Section 2.1), and the Stockholder Option Agreement, dated as of March
29, 1999 (the "STOCKHOLDER OPTION AGREEMENT"), among the stockholders of the
Company that are named therein ("STOCKHOLDERS") and Merger Subsidiary and the
transactions contemplated thereby, are advisable and are fair to and in the best
interest of the Company's stockholders, (ii) approved this Agreement and the
transactions contemplated hereby, including the Offer and the Merger, and the
Stockholder Option Agreement and the transactions contemplated thereby, which
approval constitutes approval under Section 203 of the General Corporation Law
of the State of Delaware (the "DELAWARE LAW") such that the Offer, the Merger,
the Stockholder Option Agreement and the other transactions contemplated hereby
and thereby are not and shall not be subject to any restriction of Section 203
of Delaware Law, and (iii) resolved to recommend acceptance of the Offer and
approval and adoption of this Agreement and the Merger by its stockholders. The
Company further represents that Credit Suisse First Boston Corporation ("CSFB")
has delivered to the Company's Board of Directors its opinion that the
consideration to be paid in the Offer and the Merger is fair to the holders of
Company Shares (as defined below in Section 2.2(c)) from a financial point of
view. The Company has been advised that all of its directors and executive
officers presently intend either to tender their Shares pursuant to the Offer or
to vote in favor of the Merger. The Company will promptly furnish Parent and
Merger Subsidiary with a list of its stockholders, mailing labels and any
available listing or computer file containing the names and addresses of all
record holders of Shares and lists of securities positions of Shares held in
stock depositories, in each case as of the most recent practicable date, and
will provide to Parent and Merger Subsidiary such additional information
(including, without limitation, updated lists of stockholders, mailing labels
and lists of securities positions) and such other assistance as Parent or Merger
Subsidiary may reasonably request in connection with the Offer.

                  (b) As soon as practicable on the day that the Offer is
commenced the Company will file with the SEC and disseminate to holders of
Shares a Solicitation/Recommendation Statement on Schedule 14D-9 (the "SCHEDULE
14D-9") which shall reflect the recommendations of the Company's Board of
Directors referred to above, subject to the fiduciary duties of the Board of
Directors of the Company as advised in writing by Katten Muchin & Zavis, counsel
to the Company. The Company, Parent and Merger Subsidiary each agree promptly to
correct any information provided by it for use in the Schedule 14D-9 if and to
the extent that it shall have become false or misleading in any material
respect. The Company agrees to take all steps necessary to cause the Schedule
14D-9 as so corrected to be filed with the SEC and to be disseminated to holders
of Shares, in each case as and to the extent



                                      -2-
<PAGE>

required by applicable federal securities laws. Parent and its counsel shall be
given a reasonable opportunity to review and comment on the Schedule 14D-9 prior
to its being filed with the SEC.

                  SECTION 1.3. DIRECTORS. (a) Effective upon the acceptance for
payment by Merger Subsidiary of a majority of the Shares pursuant to the Offer,
Parent shall be entitled to designate the number of directors, rounded up to the
next whole number, on the Company's Board of Directors that equals the product
of (i) the total number of directors on the Company's Board of Directors (giving
effect to the election of any additional directors pursuant to this Section) and
(ii) the percentage that the number of Shares owned by Parent or Merger
Subsidiary (including Shares accepted for payment) bears to the total number of
Shares outstanding, and the Company shall take all action necessary to cause
Parent's designees to be elected or appointed to the Company's Board of
Directors, including, without limitation, increasing the number of directors, or
seeking and accepting resignations of incumbent directors, or both; PROVIDED
that, prior to the Effective Time (defined below in Section 2.1), the Company's
Board of Directors shall always have two members who are neither designees nor
affiliates of Parent or Merger Subsidiary nor employees of the Company (each, an
"INDEPENDENT DIRECTOR"). If the number of Independent Directors is reduced below
two for any reason prior to the Effective Time, the remaining and departing
Independent Directors shall be entitled to designate a person to fill the
vacancy. No action proposed to be taken by the Company to amend or terminate
this Agreement or waive any action by Parent or Merger Subsidiary shall be
effective without the approval of both Independent Directors. At such times, the
Company will use its best efforts to cause individuals designated by Parent to
constitute the same percentage as such individuals represent on the Company's
Board of Directors of (x) each committee of the Board, (y) each board of
directors of each subsidiary (defined below in Section 4.1(a)) and (z) each
committee of each such board.

                  (b) The Company's obligations to appoint designees to the
Board of Directors shall be subject to Section 14(f) of the Exchange Act
(defined below in Section 4.1(d)) and Rule 14f-l promulgated thereunder. The
Company shall promptly take all actions required pursuant to Section 14(f) and
Rule 14f-l in order to fulfill its obligations under this Section 1.3 and shall
include in the Schedule 14D-9 such information with respect to the Company and
its officers and directors as is required under Section 14(f) and Rule 14f-l to
fulfill its obligations under this Section 1.3. Parent will supply to the
Company in writing and be solely responsible for any information with respect to
itself and its nominees, officers, directors and affiliates required by Section
14(f) and Rule 14f-1.


                                   ARTICLE II

                                   THE MERGER


                  SECTION 2.1. THE MERGER. (a) At the Effective Time, Merger
Subsidiary shall be merged (the "MERGER") with and into the Company in
accordance with Delaware Law, whereupon the separate existence of Merger
Subsidiary shall cease, and the Company shall be the surviving corporation (the
"SURVIVING CORPORATION").

                  (b) As soon as practicable after satisfaction or, to the
extent permitted hereunder, waiver of all conditions to the Merger, the Company
(and, if required, Merger Subsidiary) will file a certificate of merger with the
Secretary of State of the State of Delaware and make all other filings or
recordings required by Delaware Law in connection with the Merger. The Merger
shall become



                                      -3-
<PAGE>

effective at such time as the certificate of merger is duly filed with the
Secretary of State of the State of Delaware or, with the consent of the
Independent Directors, at such later time as is specified in the certificate of
merger (the "EFFECTIVE TIME").

                  (c) From and after the Effective Time, the Surviving
Corporation shall possess all the rights, privileges, powers and franchises and
be subject to all of the restrictions, disabilities and duties of the Company
and Merger Subsidiary, all as provided under Delaware Law.

                  SECTION 2.2. CONVERSION OF SHARES. At the Effective Time,
automatically and without any further action being required:

                  (a) each Share held by the Company as treasury stock or owned
         by Parent, Merger Subsidiary or any subsidiary of either of them
         immediately prior to the Effective Time (together, in each case, with
         the associated Right) shall be canceled, and no payment shall be made
         with respect thereto;

                  (b) each share of common stock of Merger Subsidiary
         outstanding immediately prior to the Effective Time shall be converted
         into and become one share of common stock of the Surviving Corporation
         with the same rights, powers and privileges as the shares so converted
         and shall constitute the only outstanding shares of capital stock of
         the Surviving Corporation; and

                  (c) each (i) Share outstanding immediately prior to the
         Effective Time together with the associated Right and (ii) each share
         of Series B Preferred (as defined herein) (the shares of the Series B
         Preferred and the Shares are referred to herein collectively as the
         "COMPANY SHARES") shall, except as otherwise provided in Section 2.2(a)
         or as provided in Section 2.4 with respect to Company Shares as to
         which appraisal rights have been exercised, be converted into the right
         to receive $29.25 in cash or any higher price paid for each Share in
         the Offer, without interest (the "MERGER CONSIDERATION").

                  SECTION 2.3. SURRENDER AND PAYMENT. (a) Prior to the Effective
Time, Parent shall appoint a bank or trust company (the "EXCHANGE AGENT") for
the purpose of exchanging certificates representing Company Shares for the
Merger Consideration. Parent will make available to the Exchange Agent, as
needed, the Merger Consideration to be paid in respect of the Company Shares
(the "EXCHANGE FUND"). For purposes of determining the Merger Consideration to
be made available, Parent shall assume that no holder of Company Shares will
perfect his right to appraisal of his Company Shares. Promptly after the
Effective Time, Parent will send, or will cause the Exchange Agent to send, to
each holder of Company Shares at the Effective Time a letter of transmittal for
use in such exchange (which shall specify that the delivery shall be effected,
and risk of loss and title shall pass, only upon proper delivery of the
certificates representing Company Shares to the Exchange Agent). The Exchange
Agent shall, pursuant to irrevocable instructions, make the payments provided in
this Section 2.3. The Exchange Fund shall not be used for any other purpose,
except as provided in this Agreement.

                  (b) Each holder of Company Shares that have been converted
into a right to receive the Merger Consideration, upon surrender to the Exchange
Agent of a certificate or certificates representing such Company Shares,
together with a properly completed letter of transmittal covering such Company
Shares and such other documents as may be reasonably requested, will be entitled
to



                                      -4-
<PAGE>

receive the Merger Consideration payable in respect of such Company Shares.
Until so surrendered, each such certificate shall, after the Effective Time,
represent for all purposes, only the right to receive such Merger Consideration.

                  (c) If any portion of the Merger Consideration is to be paid
to a person other than the registered holder of the Company Shares represented
by the certificate or certificates surrendered in exchange therefor, it shall be
a condition to such payment that the certificate or certificates so surrendered
shall be properly endorsed or otherwise be in proper form for transfer and that
the person requesting such payment shall pay to the Exchange Agent any transfer
or other taxes required as a result of such payment to a person other than the
registered holder of such Company Shares or establish to the satisfaction of the
Exchange Agent that such tax has been paid or is not payable. For purposes of
this Agreement, "PERSON" means an individual, a corporation, a partnership, a
limited liability company, an association, a trust or any other entity or
organization, including a government or political subdivision or any agency or
instrumentality thereof.

                  (d) After the Effective Time, there shall be no further
registration of transfers of Company Shares. If, after the Effective Time,
certificates representing Company Shares are presented to the Surviving
Corporation, they shall be canceled and exchanged for the consideration provided
for, and in accordance with the procedures set forth, in this Article II.

                  (e) Any portion of the Exchange Fund made available to the
Exchange Agent pursuant to Section 2.3(a) that remains unclaimed by the holders
of Company Shares six months after the Effective Time shall be returned to
Parent, upon demand, and any such holder who has not exchanged his Company
Shares for the Merger Consideration in accordance with this Section 2.3 prior to
that time shall thereafter look only to Parent for payment of the Merger
Consideration in respect of his Company Shares. Notwithstanding the foregoing,
Parent shall not be liable to any holder of Company Shares for any amount paid
to a public official pursuant to applicable abandoned property laws. Any amounts
remaining unclaimed by holders of Company Shares immediately prior to such time
as such amounts would otherwise escheat to or become property of any
governmental entity shall, to the extent permitted by applicable law, become the
property of Parent free and clear of any claims or interest of any person
previously entitled hereto.

                  (f) Any portion of the Merger Consideration made available to
the Exchange Agent pursuant to Section 2.3(a) to pay for Company Shares for
which appraisal rights have been perfected shall be returned to Parent, upon
demand.

                  SECTION 2.4. DISSENTING SHARES. Notwithstanding Section 2.2,
Company Shares outstanding immediately prior to the Effective Time and held by a
holder who has not voted in favor of the Merger or consented thereto in writing
and who has demanded appraisal for such Company Shares in accordance with
Delaware Law shall not be converted into a right to receive the Merger
Consideration, unless such holder fails to perfect or withdraws or otherwise
loses his right to appraisal. If after the Effective Time such holder fails to
perfect or withdraws or loses his right to appraisal, such Company Shares shall
be treated as if they had been converted as of the Effective Time into a right
to receive the Merger Consideration. The Company shall give Parent prompt notice
of any demands received by the Company for appraisal of Company Shares, and
Parent shall have the right to participate in all negotiations and proceedings
with respect to such demands. The Company shall not, except with the prior
written consent of Parent, make any payment with respect to, or settle or offer
to settle, any such demands.

                                      -5-
<PAGE>

                  SECTION 2.5. STOCK OPTIONS. (a) At or immediately prior to the
Effective Time, each outstanding Company Option (defined below) which is vested
or which pursuant to the terms of the relevant Stock Plan (defined below) become
vested by virtue of the Offer or the Merger shall be canceled, and each holder
of any such option shall be paid by the Company promptly after the Effective
Time for each such option an amount determined by multiplying (i) the excess, if
any, of $29.25 per Share over the applicable exercise price of such option by
(ii) the number of Shares such holder could have purchased had such holder
exercised such option in full immediately prior to the Effective Time (as if
such Company Option was exercisable in full); subject to the limitations set
forth in an amendment to certain option agreements (true and complete copies of
which have been provided to Parent) with respect to the Company Options issued
in 1999. The Company shall take such action or, if required, shall amend each of
the Company's Stock Plans that do not provide for the vesting of unvested
Company Options by virtue of the Offer or the Merger so that, at the Effective
Time, each of the then outstanding unvested Company Options shall by virtue of
the Merger, and without any further action on the part of any holder thereof, be
assumed by Parent and converted into an option to purchase that number of shares
of common stock, par value $.10 per share ("PARENT COMMON STOCK"), of Parent
determined by multiplying the number of Shares subject to such Company Option at
the Effective Time by the quotient obtained by dividing (x) $29.25 by (y) the
average closing price of Parent Common Stock on the New York Stock Exchange
Composite Tape for the 30 consecutive trading days immediately prior to the
Effective Time (such quotient, the "CONVERSION NUMBER"), at an exercise price
per share of Parent Common Stock equal to the quotient obtained by dividing (x)
the exercise price per Share of such Company Option immediately prior to the
Effective Time by (y) the Conversion Number. If the foregoing calculation
results in an assumed Company Option being exercisable for a fraction of a share
of Parent Common Stock, then the number of shares of Parent Common Stock subject
to such option shall be rounded down to the nearest whole number of shares. The
term, exercisability, vesting schedule, status as an "INCENTIVE STOCK option"
under Section 422 of the Internal Revenue Code of 1986, as amended, and the
rules and regulations thereunder (the "CODE"), if applicable, and all other
terms and conditions of unvested Company Options being assumed by Parent will,
to the extent permitted by law and otherwise reasonably practicable, be
unchanged. Continuous employment with the Company or any of its subsidiaries
shall be credited to the optionee for purposes of determining the vesting of the
number of shares of Parent Common Stock subject to exercise under the optionee's
assumed Company Option after the Effective Time. "COMPANY OPTION" means any
option granted, whether or not exercisable, and not exercised or expired, to a
current or former employee, director or independent contractor of the Company or
any of its subsidiaries or any predecessor thereof to purchase Shares pursuant
to any stock option, stock bonus, stock award, or stock purchase plan, program,
or arrangement of the Company or any of its subsidiaries or any predecessor
thereof (collectively, the "STOCK PLANS") or any other contract or agreement
entered into by the Company or any of its subsidiaries. Notwithstanding any
other provision of this Section 2.5, payment may be withheld in respect of any
Company Option until necessary consents are obtained.

                  (b) Prior to the Effective Time, the Company shall use its
best efforts to (i) obtain any consents from holders of Company Options and (ii)
make any amendments to the terms of such stock option or compensation plans or
arrangements that, in the case of either clauses (i) or (ii), are necessary to
give effect to the transactions contemplated by Section 2.5(a).

                  (c) Prior to the Effective Time, the Company shall terminate
the Company's 1996 Stock Purchase Plan and any other of the Company's employee
stock purchase plans as soon as possible without violating the terms of the
plan. The Company shall not grant any option or right to acquire stock under the
Company's 1996 Stock Purchase Plan or any other such stock purchase plan on or
after the date of this



                                      -6-
<PAGE>

Agreement.

                  (d) Parent shall take all corporate action necessary to
reserve for issuance a sufficient number of shares of Parent Common Stock for
delivery pursuant to the terms set forth in this Section 2.5. Parent shall cause
the shares of Parent Common Stock issuable upon exercise of the assumed Company
Options to be registered, or to be issued pursuant to a then effective
registration statement, no later than 45 days after the Effective Time on Form
S-8 (or any successor form thereto) promulgated by the SEC and shall use its
best efforts to maintain the effectiveness of such registration statement or
registration statements for so long as such assumed Company Options remain
outstanding.


                                   ARTICLE III

                            THE SURVIVING CORPORATION


                  SECTION 3.1. CERTIFICATE OF INCORPORATION. The certificate of
incorporation of the Surviving Corporation at the Effective Time shall be
amended and restated to be in the form attached hereto as Annex II (including
the certificate of designations of the Class II Series B Preferred Stock) until
amended in accordance with applicable law.

                  SECTION 3.2. BYLAWS. The bylaws of Merger Subsidiary in effect
at the Effective Time shall be the bylaws of the Surviving Corporation until
amended in accordance with applicable law.

                  SECTION 3.3. DIRECTORS AND OFFICERS. From and after the
Effective Time, until successors are duly elected or appointed and qualified in
accordance with applicable law, (i) the directors of Merger Subsidiary at the
Effective Time shall be the directors of the Surviving Corporation, and (ii) the
officers of the Merger Subsidiary at the Effective Time shall be the officers of
the Surviving Corporation.


                                     ARTICLE IV

                            REPRESENTATIONS AND WARRANTIES


                  SECTION 4.1. REPRESENTATIONS AND WARRANTIES OF THE COMPANY.
The Company represents and warrants to Parent and Merger Subsidiary as follows.
The representations and warranties of the Company are made only on and as of the
date hereof.

                  (a) ORGANIZATION, STANDING AND CORPORATE POWER. Each of the
Company and each of its Significant Subsidiaries is a corporation duly
organized, validly existing and in good standing under the laws of the
jurisdiction in which it is incorporated and has the requisite corporate power
and authority to carry on its business as now being conducted. Each of the
Company and each of its Significant Subsidiaries is duly qualified or licensed
to do business and is in good standing in each jurisdiction in which the nature
of its business or the ownership or leasing of its properties makes such
qualification or licensing necessary, other than in such jurisdictions where the
failure to be so qualified 



                                      -7-
<PAGE>

or licensed (individually or in the aggregate) could not reasonably be expected
to have a material adverse effect on the financial condition, business, assets
or results of operations of the Company and its subsidiaries taken as a whole
except that occurrences due solely to a disruption of the Company's or its
subsidiary's businesses solely as a result of the announcement of the execution
of this Agreement and the transactions proposed to be consummated by this
Agreement shall be excluded from consideration for purposes of the effect of an
action or inaction on the Company and its subsidiaries taken as a whole (a
"MATERIAL ADVERSE EFFECT"). The Company has delivered to Parent complete and
correct copies of its Articles of Incorporation and By-Laws and the certificates
of incorporation and by-laws of its Significant Subsidiaries, in each case as
amended to the date of this Agreement. For purposes of this Agreement, a
"SUBSIDIARY" of any person means another person, an amount of the voting
securities, other voting ownership or voting partnership interests of which is
sufficient to elect at least a majority of its Board of Directors or other
governing body (or, if there are no such voting interests, 50% or more of the
equity interests of which) is owned directly or indirectly by such first person;
and a "SIGNIFICANT SUBSIDIARY" means any subsidiary of a person that constitutes
a significant subsidiary of such person within the meaning of Rule 1-02 of
Regulation S-X of the Securities and Exchange Commission (the "SEC").

                  (b) SUBSIDIARIES. Section 4.1(b) of the disclosure schedule
delivered by the Company to Parent and Merger Subsidiary prior to the execution
of this Agreement (the "DISCLOSURE SCHEDULE") lists each subsidiary of the
Company and its respective jurisdiction of incorporation and indicates whether
such subsidiary is a Significant Subsidiary. Except as set forth in Section
4.1(b) of the Disclosure Schedule, all the outstanding shares of capital stock
of each such domestic subsidiary have been validly issued and are fully paid and
nonassessable and are owned by the Company, by another subsidiary of the Company
or by the Company and another such subsidiary, free and clear of all pledges,
claims, liens, charges, encumbrances and security interests of any kind or
nature whatsoever (collectively, "LIENS") and free of any other limitation or
restriction (including any restriction on the right to vote, sell or otherwise
dispose of such capital stock). Except for the capital stock of its subsidiaries
or as listed in Section 4.1(b) of the Disclosure Schedule, the Company does not
own, directly or indirectly, any capital stock or other ownership interest in
any person.

                  (c) CAPITAL STRUCTURE. The authorized capital stock of the
Company consists of 180,000,000 shares of Common Stock and 10,000,000 shares of
Class II Preferred Stock, par value $.01 per share (the "PREFERRED STOCK"). At
the time of execution of this Agreement, (i) 101,282,612 shares of Common Stock
were issued and outstanding (which includes 13,750,523 shares issued in
connection with the acquisition of Memco Software Ltd. ("Memco"), (ii) no shares
of Common Stock were held by the Company in its treasury or by any of the
Company's subsidiaries, (iii) 28,442,209 shares of Common Stock were reserved
for issuance pursuant to options outstanding under the Stock Plans (which
includes 3,328,113 shares reserved for issuance pursuant to Stock Plans received
through the acquisition of Memco), and (iv) 1,768,421 shares of Common Stock
were reserved for issuance upon conversion of the outstanding shares of Class II
Series B Preferred Stock (the "Series B Stock"), (v) 12,401,032 shares of Common
Stock were reserved for issuance upon conversion of the Company's 6 3/4%
Convertible Subordinated Notes due 2001 and 6.25% Convertible Subordinated Notes
due 2002 (the "Convertible Notes") and (vi) 1,800,000 shares of Class II Series
A Junior Participating Preferred Stock (the "PARTICIPATING PREFERRED STOCK")
were reserved for issuance in connection with the rights (the "RIGHTS") to
purchase shares of Participating Preferred Stock issued pursuant to the Rights
Agreement dated as of December 21, 1995 (as amended from time to time, the
"RIGHTS AGREEMENT"), between the Company and Harris Trust and Savings Bank, as
Rights Agent (the "RIGHTS AGENT"). Except as set forth above, at the time of
execution of this Agreement, no shares of 



                                      -8-
<PAGE>

capital stock or other voting securities of the Company are issued, reserved for
issuance or outstanding. All outstanding shares of capital stock of the Company
are, and all shares which may be issued pursuant to the Stock Plans will be,
when issued, duly authorized, validly issued, fully paid and nonassessable and
not subject to preemptive rights. Except as set forth in Section 4.1(c) of the
Disclosure Schedule, there are not any bonds, debentures, notes or other
indebtedness or securities of the Company having the right to vote (or
convertible into, or exchangeable for, securities having the right to vote) on
any matters on which shareholders of the Company may vote. Except as set forth
above and in Section 4.1(c) of the Disclosure Schedule, there are not any
securities, options, warrants, calls, rights, commitments, agreements,
arrangements or undertakings of any kind to which the Company or any of its
subsidiaries is a party or by which any of them is bound obligating the Company
or any of its subsidiaries to issue, deliver or sell, or cause to be issued,
delivered or sold, additional shares of capital stock or other voting securities
of the Company or of any of its subsidiaries or obligating the Company or any of
its subsidiaries to issue, grant, extend or enter into any such security,
option, warrant, call, right, commitment, agreement, arrangement or undertaking.
There are no outstanding rights, commitments, agreements, arrangements or
undertakings of any kind obligating the Company or any of its subsidiaries to
repurchase, redeem or otherwise acquire any shares of capital stock or other
voting securities of the Company or any of its subsidiaries or any securities of
the type described in the two immediately preceding sentences. The Company has
delivered to Parent complete and correct copies of the Stock Plans and all forms
of Company Options. Section 4.1(c) of the Disclosure Schedule sets forth a
complete and accurate list of all Company Options outstanding as of the date of
this Agreement and the exercise price of each outstanding Company Option.

                  (d) AUTHORITY; NONCONTRAVENTION. The Company has the requisite
corporate power and authority to enter into this Agreement and the Consulting
and Non-Compete Agreements (the "Consulting Agreements" and, together with this
Agreement, the "Agreements") being entered into by the Company with the chief
executive officer, chief operating officer and chief financial officer of the
Company (true and complete copies of which have been provided to Parent),
simultaneously with entering into this Agreement. Except for any required
approval by the Company's stockholders in connection with the consummation of
the Merger, the Company has the requisite corporate power and authority to
consummate the transactions contemplated by this Agreement. The execution and
delivery of the Agreements by the Company and the consummation by the Company of
the transactions contemplated by the Agreements have been duly authorized by all
necessary corporate action on the part of the Company, except for any required
approval by the Company's stockholders in connection with the consummation of
the Merger. This Agreement has been duly executed and delivered by the Company
and, assuming this Agreement constitutes a valid and binding agreement of Parent
and Merger Subsidiary, constitutes a valid and binding obligation of the
Company, enforceable against the Company in accordance with its terms. The
Consulting Agreements have been duly executed and delivered by the Company and,
assuming each Consulting Agreement constitutes a valid and binding agreement of
the executive party thereto, constitutes a valid and binding obligation of the
Company, enforceable against the Company in accordance with its terms. The
execution and delivery of the Agreements does not, and the consummation of the
transactions contemplated by the Agreements and compliance with the provisions
of the Agreements will not, conflict with, or result in any violation of, or
default (with or without notice or lapse of time, or both) under, or give rise
to a right of termination, cancellation or acceleration of any obligation or to
loss of a material benefit under, or result in the creation of any Lien upon any
of the properties or assets of the Company or any of its subsidiaries under, (i)
the Certificate of Incorporation or By-Laws of the Company or the comparable
charter or organizational documents of any of its Significant Subsidiaries, (ii)
any loan or credit agreement, note, bond, mortgage, indenture, lease or other
agreement, instrument, permit, concession, franchise or 



                                      -9-
<PAGE>

license applicable to the Company or any of its subsidiaries or their respective
properties or assets or (iii) subject to the governmental filings and other
matters referred to in the following sentence, any judgment, order, decree,
statute, law, ordinance, rule or regulation applicable to the Company or any of
its subsidiaries or their respective properties or assets, other than, in the
case of clause (ii) above, any such conflicts, violations, defaults, rights or
Liens that individually or in the aggregate could not reasonably be expected to
(A)(1) with respect to the matters disclosed in Section 4(p)(i) of the
Disclosure Schedule, result in any required repurchase by the Company of the
Convertible Notes, result in payments in excess of $150,000,000 in the aggregate
under all "C.A. clause" contracts, result in severance payments in excess of
$100,000,000 in the aggregate or result in payments to Folding Space L.L.C. in
excess of $23,500,000 in the aggregate or (2) in any other manner have a
Material Adverse Effect, (B) impair the ability of the Company to perform its
obligations in all material respects under this Agreement or (C) prevent or
materially delay consummation of any of the transactions contemplated by this
Agreement and other than, in the case of clause (iii) above, any such conflicts,
violations, defaults, rights or Liens that individually or in the aggregate
could not reasonably be expected to (A) have a Material Adverse Effect, (B)
impair the ability of the Company to perform its obligations in all material
respects under this Agreement or (C) prevent or materially delay consummation of
any of the transactions contemplated by this Agreement. No consent, approval,
order or authorization of, or registration, declaration or filing with or
exemption by (collectively, "CONSENTS") any federal, state or local government
or any court, administrative or regulatory agency or commission or other
governmental authority or agency, domestic or foreign (a "GOVERNMENTAL ENTITY"),
is required by or with respect to the Company or any of its subsidiaries in
connection with the execution and delivery of the Agreements by the Company or
the consummation by the Company of the transactions contemplated by the
Agreements, except, in the case of this Agreement, for (i) the filing of a
premerger notification and report form by the Company under the
Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, and the rules
and regulations thereunder (the "HSR ACT"), (ii) compliance with any applicable
requirements of the Securities Exchange Act of 1934, as amended, and the rules
and regulations thereunder (the "EXCHANGE ACT"), (iii) the filing of a
certificate of merger in accordance with Delaware Law and appropriate documents
with the relevant authorities of other states in which the Company is qualified
to do business, (iv) European antitrust notification and (v) such other
consents, approvals, orders, authorizations, registrations, declarations and
filings as to which the failure to obtain or make could not reasonably be
expected to (x) have a Material Adverse Effect or (y) prevent or materially
delay the consummation of any of the transactions contemplated by this
Agreement.

                  (e) SEC DOCUMENTS; FINANCIAL STATEMENTS; NO UNDISCLOSED
LIABILITIES. The Company has filed all required reports, schedules, forms,
statements and other documents with the SEC since January 1, 1998 and has
provided to Parent a true and complete copy of the Company's Annual Report on
Form 10-K which will be filed no later than March 31, 1999 (the "COMPANY'S 1999
10-K" and together with such other filed documents referred to in this sentence,
the "SEC DOCUMENTS"). As of their respective filing dates (or in the case of the
Company's 1999 10-K, March 28, 1999), the SEC Documents complied in all material
respects with the then applicable requirements of the Securities Act of 1933, as
amended, and the rules and regulations thereunder (the "SECURITIES ACT"), or the
Exchange Act, as the case may be, applicable to such SEC Documents, and, as of
such filing dates (or in the case of the Company's 1999 10-K, the date of this
Agreement) (or if amended or superseded by a filing prior to the date of this
Agreement, as of the date of such filing) none of the SEC Documents 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. The financial statements of the Company included in the SEC



                                      -10-
<PAGE>

Documents (the "FINANCIAL STATEMENTS") complied as to form in all material
respects with then applicable accounting requirements and the published rules
and regulations of the SEC with respect thereto, have been prepared in
accordance with generally accepted accounting principles (except, in the case of
unaudited statements, as permitted by Form 10-Q of the SEC) applied on a
consistent basis during the periods involved (except as may be indicated in the
notes thereto) and fairly present in all material respects the consolidated
financial position of the Company 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 year-end audit adjustments). Except as set forth in the Company Filed SEC
Documents (defined below in Section 4.1(g)) or in Section 4.1(e) or (g) of the
Disclosure Schedule, neither the Company nor any of its subsidiaries has any
liabilities or obligations of any nature (whether accrued, absolute, contingent
or otherwise) and there is no existing condition, situation or set of
circumstances, in each case which are required by generally accepted accounting
principles to be set forth on a consolidated balance sheet of the Company and
its consolidated subsidiaries or in the notes thereto, except for liabilities
incurred in connection with this Agreement or which, individually or in the
aggregate, could not reasonably be expected to have a Material Adverse Effect.

                  (f) DISCLOSURE DOCUMENTS. (i) Each document required to be
filed by the Company with the SEC in connection with the transactions
contemplated by this Agreement (the "COMPANY DISCLOSURE DOCUMENTS"), including,
without limitation, the Schedule 14D-9, the proxy or information statement of
the Company (the "COMPANY PROXY STATEMENT"), if any, to be filed with the SEC in
connection with the Merger, and any amendments or supplements thereto will, when
filed, comply as to form in all material respects with the applicable
requirements of the Exchange Act.

                  (ii) At the time the Company Proxy Statement or any amendment
or supplement thereto is first mailed to stockholders of the Company and at the
time such stockholders vote on adoption of this Agreement, the Company Proxy
Statement, as supplemented or amended, if applicable, will not contain any
untrue statement of a material fact or omit to state any material fact necessary
in order to make the statements made therein, in the light of the circumstances
under which they were made, not misleading. At the time of the filing of any
Company Disclosure Document other than the Company Proxy Statement and at the
time of any distribution thereof, such Company Disclosure Document will not
contain any untrue statement of a material fact or omit to state a material fact
necessary in order to make the statements made therein, in the light of the
circumstances under which they were made, not misleading. The representations
and warranties contained in this Section 4.1(f)(ii) will not apply to statements
or omissions included in the Company Disclosure Documents based upon information
furnished to the Company in writing by Parent or Merger Subsidiary specifically
for use therein.

                  (iii) The information with respect to the Company or any
subsidiary that the Company furnishes to Parent or Merger Subsidiary in writing
specifically for use in the Offer Documents will not, at the time of the filing
thereof, at the time of any distribution thereof and at the time of the
consummation of the Offer, 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 made therein, in the light of the circumstances
under which they were made, not misleading.

                  (g) ABSENCE OF CERTAIN CHANGES OR EVENTS. Except as disclosed
in the SEC Documents filed and publicly available prior to the date of this
Agreement and the 1999 Form 10-K (the "COMPANY FILED SEC DOCUMENTS") or in
Section 4.1(g) of the Disclosure Schedule, since




                                      -11-
<PAGE>

December 31, 1998, the Company has conducted its business only in the ordinary
course consistent with past practice, and there has not been (i) except for the
restructuring announced by the Company in 1999 and described in Section 4.1(g)
of the Disclosure Schedule, any event, occurrence or development of a state of
circumstances which has had or could reasonably be expected to have a Material
Adverse Effect, (ii) any declaration, setting aside or payment of any dividend
or other distribution (whether in cash, stock or property) with respect to any
of the Company's capital stock or any repurchase, redemption or other
acquisition by the Company or any of its subsidiaries of any outstanding shares
of capital stock or other securities of the Company or any of its subsidiaries,
(iii) any split, combination or reclassification of any of its capital stock or
any issuance or the authorization of any issuance of any other securities in
respect of, in lieu of or in substitution for shares of its capital stock, (iv)
(A) any granting by the Company or any of its subsidiaries to any current or
former director, officer or employee of the Company or any of its subsidiaries
of any increase in compensation or benefits or severance or termination pay or
benefits, except in the ordinary course of business consistent with past
practice or as was required under employment, severance or termination
agreements or plans in effect as of December 31, 1998, or (B) any entry by the
Company or any of its subsidiaries into any employment, deferred compensation,
severance or termination agreement with any such current or former director,
officer or employee, except in the ordinary course of business consistent with
past practice, (v) any damage, destruction or loss, whether or not covered by
insurance, that has had or could reasonably be expected to have a Material
Adverse Effect, (vi) any change in accounting methods, principles or practices
by the Company or any of its subsidiaries, (vii) any amendment of any material
term of any outstanding security of the Company or any of its subsidiaries,
(viii) any incurrence, assumption or guarantee by the Company or any of its
subsidiaries of any indebtedness for borrowed money other than in the ordinary
course of business consistent with past practice, but in no event in the amount
of more than $1,000,000 in the aggregate, (ix) any creation or assumption by the
Company or any of its subsidiaries of any Lien on any asset other than in the
ordinary course of business consistent with past practice, but in no event in
the amount of more than $1,000,000 for any one transaction or $5,000,000 in the
aggregate, (x) any making of any loan, advance or capital contributions to or
investment in any person other than to a subsidiary that is wholly owned (other
than director qualifying shares) or other than in the ordinary course of
business consistent with past practice, but in no event in the amount of more
than $1,000,000 for any one transaction or $5,000,000 in the aggregate and other
than investments in cash equivalents made in the ordinary course of business
consistent with past practice, (xi) any transaction or commitment made, or any
contract or agreement entered into, by the Company or any of its subsidiaries
relating to its assets or business (including the acquisition or disposition of
any assets or the merger or consolidation with any person) or any relinquishment
by the Company or any of its subsidiaries of any contract or other right, in
either case material to the Company and its subsidiaries taken as a whole,
representing commitments on behalf of the Company or any of its subsidiaries of
more than $1,000,000 for any transaction or $5,000,000 for any series of related
transactions, or otherwise in the ordinary course of business consistent with
past practice and those contemplated by this Agreement, (xii) any material labor
dispute, other than routine individual grievances, or any activity or proceeding
by a labor union or representative thereof to organize any employees of the
Company or any of its subsidiaries, which employees were not subject to a
collective bargaining agreement at December 31, 1998, or any material lockouts,
strikes, slowdowns, work stoppages or threats thereof by or with respect to such
employees or (xiii) any agreement, commitment, arrangement or undertaking by the
Company or any of its subsidiaries to perform any action described in clauses
(i) through (xii).

                  (h) LITIGATION. Except as disclosed in the Company Filed SEC
Documents or in Section 4.1(h) of the Disclosure Schedule, there is no suit,
action or proceeding pending or, to the



                                      -12-
<PAGE>

knowledge of the Company, threatened against or affecting the Company or any of
its subsidiaries that, individually or in the aggregate, could reasonably be
expected to (i) have a Material Adverse Effect, (ii) impair the ability of the
Company to perform its obligations under this Agreement or (iii) prevent or
materially delay the consummation of the Offer, the Merger or any of the other
transactions contemplated by this Agreement, nor is there any judgment, decree,
injunction, rule or order of any Governmental Entity or arbitrator outstanding
against the Company or any of its subsidiaries having, or which, insofar as
reasonably can be foreseen, in the future would have, any such effect. Section
4.1(h) of the Disclosure Schedule sets forth, with respect to any pending suit,
action or proceeding to which the Company or any its subsidiaries is a party and
which involves claims which if adversely determined would exceed $2,000,000, the
forum, the parties thereto, the subject matter thereof and the amount of damages
claimed.

                  (i) ABSENCE OF CHANGES IN STOCK AND BENEFIT PLANS; SEVERANCE
BENEFITS. Except as disclosed in Section 4.1(i) and (g) of the Disclosure
Schedule, there has not been (i) any acceleration, amendment or change of the
period of exercisability or vesting of any Company Options or restricted stock,
stock bonus or other awards under the Stock Plans or any other options to
purchase Shares or stock of any subsidiary of the Company (including any
discretionary acceleration of the exercise periods or vesting by the Company's
Board of Directors or any committee thereof or any other persons administering a
Stock Plan) or authorization of cash payments in exchange for any Company
Options, restricted stock, stock bonus or other awards granted under any of such
Stock Plans or any other options to purchase Shares or stock of any subsidiary
of the Company; or (ii) any adoption or amendment by the Company or any of its
subsidiaries of any collective bargaining agreement or any bonus, pension,
profit sharing, deferred compensation, incentive compensation, stock ownership,
stock purchase, stock option, phantom stock, stock appreciation right,
retirement, vacation, severance, disability, death benefit, hospitalization,
medical, workers' compensation, supplementary unemployment benefits or other
plan, arrangement or understanding providing benefits to any current or former
employee, officer or director of the Company or any of its subsidiaries or any
beneficiary thereof entered into, maintained or contributed to, as the case may
be, by the Company or any of its subsidiaries (collectively, "BENEFIT PLANS").
Section 4.1(i) of the Disclosure Schedule sets forth for each of the five most
highly compensated employees of the Company the aggregate maximum amount of all
termination, severance or other similar benefits (but the Company's best
estimate of tax gross up amounts) to which such employee is entitled in
connection with the Merger and the other transactions contemplated by this
Agreement; provided that the gross up shall be based on these numbers.

                  (j) PARTICIPATION AND COVERAGE IN BENEFIT PLAN. Except with
respect to (A) changes required by applicable law or (B) amendments and other
actions disclosed in the Company Filed SEC Documents or Section 4.1(i), (g) or
(j) of the Disclosure Schedule, there has been no written interpretation or
announcement (whether or not written) by the Company or any of its subsidiaries
relating to, or change in employee participation or coverage under, any Benefit
Plan which would materially increase the expense of maintaining such Benefit
Plan above the level of the expense incurred in respect thereof for the fiscal
year ended on December 31, 1997.

                  (k) ERISA COMPLIANCE. (i) Section 4.1(k)(i) of the Disclosure
Schedule contains a list and brief description of (A) all "EMPLOYEE PENSION
BENEFIT PLANS" (defined in Section 3(2) of the Employee Retirement Income
Security Act of 1974, as amended ("ERISA")), "EMPLOYEE WELFARE BENEFIT PLANS"
(defined in Section 3(l) of ERISA) and all other Benefit Plans maintained, or
contributed to, by the Company or any of its subsidiaries or ERISA affiliates
(defined below) for the benefit of any current or former employees, officers or
directors of the Company or any of its subsidiaries or ERISA affiliates or under
which the Company or any of its subsidiaries or ERISA 



                                      -13-
<PAGE>

affiliates has any liability other than Benefit Plans exempt from Title I of
ERISA pursuant to Section 4(b)(4) of ERISA and (B) all material Benefit Plans
maintained outside of the United States primarily for the benefit of persons
substantially all of whom are non-resident aliens with respect to the United
States. For purposes of this Agreement, "ERISA AFFILIATE" of the Company means
any person which, together with the Company or any of its subsidiaries, would be
treated as a single employer under Section 414 of the Code. The only Benefit
Plans described in clause (A) of the preceding sentence which individually or
collectively would constitute an "EMPLOYEE PENSION BENEFIT PLAN" defined in
Section 3(2) of ERISA (the "PENSION PLANS") are identified as such in Section
4.1(k) of the Disclosure Schedule. The Company has provided to Parent a true and
complete copy of each Pension Plan.

                  (ii) Each Benefit Plan has been maintained and administered in
compliance in all material respects with its terms and with the requirements
prescribed by any and all applicable statutes, orders, rules and regulations,
and is, to the extent required by applicable law or contract, fully funded
without having any material deficit or material unfunded actuarial liability.
Each Benefit Plan intended to be qualified under Section 401(a) of the Code is
and has been at all times (giving effect to any applicable retroactive remedial
amendment period) so qualified.

                  (iii) No Benefit Plan is covered by Title IV of ERISA and no
contributions to any Benefit Plan are required under Section 412 of the Code.
Neither the Company nor any of its subsidiaries has incurred or expects to incur
any liability under Title IV of ERISA or any liability or penalty under Section
4975 or 4980B of the Code or Section 502(i) of ERISA.

                  (iv) Except as disclosed in Section 4.1(k)(iv) of the
Disclosure Schedule, there are no pending or anticipated material claims against
or otherwise involving any of the Benefit Plans and no material suit, action or
other litigation has been brought against or with respect to any Benefit Plan
(excluding, in each case, claims for benefits incurred in the ordinary course of
Benefit Plan activities).

                  (v) All material contributions, reserves or premium payments
required to be made as of the date hereof to or with respect to the Benefit
Plans have been made or provided for.

                  (vi) Except as required by law or as disclosed in Section
4.1(k)(vi) of the Disclosure Schedule, neither the Company nor any of its
subsidiaries has any obligations for post-retirement or post-termination health
and life benefits under any Benefit Plan.

                  (l) TAXES. As used in this Agreement, "TAX" or "TAXES" shall
include all Federal, state, local and foreign income, property, sales, excise
withholding and other taxes, tariffs or governmental charges or assessments of
any nature whatsoever as well as any interest, penalties and additions thereto.
Except as set forth in Schedule 4.1(l) of the Disclosure Schedule:

                  (i) The Company and each of its subsidiaries have timely filed
all tax returns, statements, reports and forms required to be filed with any tax
authority and in accordance with all applicable laws (other than a failure in an
immaterial manner). All such tax returns are correct and complete in all
respects. All taxes owed by the Company and any of its subsidiaries (whether or
not shown on any tax return) have been paid. There are no Liens on any of the
assets of the Company or any of its subsidiaries that arose in connection with
any failure (or alleged failure) to pay any tax.

                                      -14-
<PAGE>

                  (ii) The Company and each of its subsidiaries has withheld and
timely paid all taxes required to have been withheld and paid in connection with
amounts paid or owing to any employee, independent contractor, creditor,
stockholder, or other third party (other than a failure in an immaterial
manner).

                  (iii) Neither the Company nor any of its subsidiaries expects
any authority to assess any additional taxes against the Company or any of its
subsidiaries for any period for which tax returns have been filed. No dispute or
claim concerning any tax liability of the Company or any of its subsidiaries has
been proposed or claimed in writing by any authority.

                  (iv) Neither the Company nor any of its subsidiaries has
waived any statute of limitations in respect of taxes or agreed to any extension
of time with respect to a tax assessment or deficiency.

                  (v) Neither the Company nor any of its subsidiaries has filed
a consent pursuant to Section 341(f) of the Code concerning collapsible
corporations. Neither the Company nor any of its subsidiaries is a party to any
tax allocation or sharing agreement other than any such agreement with any
member of its U.S. consolidated group. Neither the Company nor any of its
subsidiaries has any liability for the taxes of any person (other than the
Company and any of its subsidiaries that is currently a member of the Company's
affiliated group filing a consolidated federal income tax return) under Treas.
Reg. ss.1.1502-6 (or any similar provision of state, local, or foreign law), as
a transferee or successor, by contract, or otherwise.

                  (vi) As of the date of the most recent financial statements
included in the Company Filed SEC Documents, the unpaid taxes of the Company and
its subsidiaries did not exceed the liability for taxes (rather than any reserve
for deferred taxes established to reflect timing differences between book and
tax income) set forth on the face of such financial statements.

                  (vii) Neither the Company nor any of its subsidiaries is
required to include in income any material adjustment pursuant to Section 481(a)
of the Code (or similar provisions of other law or regulations) in its current
or in any future taxable period by reason of a change in accounting method; nor
does the Company or any of its subsidiaries have any knowledge that the Internal
Revenue Service (or other taxing authority) has proposed or is considering
proposing, any such change in accounting method.

                  (viii) Neither the Company nor any of its subsidiaries is a
party to any agreement, contract, or arrangement that, individually or
collectively, could give rise to the payment of any amount (whether in cash or
property, including Shares) that would not be deductible pursuant to the terms
of Sections 162(a)(1), 162(m), 162(n) or 280G of the Code.

                  (m) STATE TAKEOVER STATUTES. The Board of Directors of the
Company has approved this Agreement, the Stockholder Option Agreement and the
transactions contemplated hereby and thereby including, without limitation, the
Offer and the Merger, and such approval is sufficient to render inapplicable to
this Agreement, the Stockholder Option Agreement and the transactions
contemplated hereby and thereby including, without limitation, the Offer and the
Merger, the restrictions and limitations of Section 203 of Delaware Law. To the
best of the Company's knowledge, no other "FAIR PRICE", "MORATORIUM", "CONTROL
SHARE ACQUISITION", or other anti-takeover



                                      -15-
<PAGE>

statute or similar statute or regulation, applies or purports to apply to the
Offer, the Merger, this Agreement or any of the other transactions contemplated
hereby or thereby.

                  (n) BROKERS; SCHEDULE OF FEES AND EXPENSES. No broker,
investment banker, financial advisor or other person, other than CSFB, the fees
and expenses of which will be paid by the Company (and a copy of whose
engagement letters and a calculation of the fees that would be due thereunder
has been provided to Parent), is entitled to any broker's, finder's, financial
advisor's or other similar fee or commission in connection with the transactions
contemplated by this Agreement based upon arrangements made by or on behalf of
the Company or any of its subsidiaries. Assuming consummation of the Offer and
the Merger, no such engagement letter obligates the Company to continue to use
their services or pay fees or expenses in connection with any future
transaction.

                  (o) PERMITS; COMPLIANCE WITH LAWS; ENVIRONMENTAL MATTERS. (i)
Each of the Company and its subsidiaries has in effect all federal, state, local
and foreign governmental approvals, authorizations, certificates, filings,
franchises, licenses, notices, permits and rights ("PERMITS") necessary for it
to own, lease or operate its properties and assets and to carry on its business
as now conducted, and there has occurred no default under any such Permit,
except for the absence of Permits and for defaults under Permits which absence
or defaults, individually or in the aggregate, could not reasonably be expected
to have a Material Adverse Effect. The Company and its subsidiaries have been,
and are, in compliance in all respects with all applicable statutes, laws or
ordinances, regulations, rules, judgments, decrees or orders of any Governmental
Entity, and neither the Company nor any of its subsidiaries has received any
notice from any Governmental Entity or any other person that either the Company
or any of its subsidiaries is in violation of, or has violated, in any respect
any applicable statutes, laws or ordinances, regulations, rules, judgments,
decrees or orders, except such failures to comply or violations as would not
reasonably be expected to have a Material Adverse Effect.

                  (ii) Neither the Company nor any of its subsidiaries has (i)
placed, held, located, released, transported or disposed of any Hazardous
Substance (as defined below) on, under, from or at any of the Company's or any
of its subsidiaries' properties or any other properties, other than in a manner
that could not, in all such cases taken individually or in the aggregate,
reasonably be expected to have or result in a Material Adverse Effect, (ii) any
knowledge of the presence of any Hazardous Substances that have been released
into the environment on, under or at any of the Company's or any of its
subsidiaries' properties other than that which could not reasonably be expected
to have or result in a Material Adverse Effect, or (iii) received any written
notice (A) of any violation of any applicable statute, law, ordinance,
regulation, rule, judgment, decree or order of any Governmental Entity relating
to any matter of pollution, protection of the environment or environmental
regulation or control or regarding Hazardous Substances (collectively,
"Environmental Laws") that has not been resolved or settled with the relevant
Governmental Entity, (B) of the institution or pendency of any suit, action,
claim, proceeding or investigation by any Governmental Entity or any third party
in connection with any such violation, (C) requiring the response to or
remediation of Hazardous Substances at or arising from any of the Company's or
any of its subsidiaries' properties or any other properties, (D) alleging
non-compliance by the Company or any of its subsidiaries with the terms of any
permit required under any Environmental Law in any manner reasonably likely to
require material expenditures or to result in material liability or (E)
demanding payment for response to or remediation of Hazardous Substances at or
arising from any of the Company's or any of its subsidiaries' properties or any
other properties. For purposes of this Agreement, the term "Hazardous Substance"
shall mean any material defined as toxic or hazardous, including any petroleum
and petroleum products, under any applicable Environmental Law.

                                      -16-
<PAGE>

                  (p) CONTRACTS; DEBT INSTRUMENTS. (i) Except as otherwise
disclosed in Section 4.1(p)(i) of the Disclosure Schedule or filed with the SEC
as an exhibit to any Filed SEC Document, neither the Company nor any of its
subsidiaries is a party to or subject to:

                  (A) any union contract, or any employment, consulting,
         severance, termination, or indemnification agreement, contract or
         arrangement providing for future payments, written or oral, with any
         current or former officer, consultant, director or employee which (1)
         exceeds $300,000 per annum or (2) requires aggregate annual payments or
         total payments over the life of such agreement, contract or arrangement
         to such current or former officer, consultant, director or employee in
         excess of $300,000 or $600,000, respectively, and is not terminable by
         it or its subsidiary on 30 days' notice or less without penalty or
         obligation to make payments related to such termination (a true and
         complete copy of a severance agreement entered into by the Company has
         been provided to Parent and all severance or termination agreements
         entered into by the Company with its or its subsidiaries' employees are
         substantially identical to the severance agreement so provided to
         Parent other than the date of such agreement, the employee covered
         thereby and the amounts payable thereunder upon severance);

                  (B) any joint venture contract or arrangement or any other
         agreement which has involved or is expected to involve a sharing of
         revenues of $2,000,000 per annum or more with other persons;

                  (C) any lease for real or personal property in which the
         amount of payments which the Company is required to make on an annual
         basis exceeds $2,000,000;

                  (D) any material agreement, contract, policy, license, Permit,
         document, instrument, arrangement or commitment which has not been
         terminated or performed in its entirety and not renewed which may be,
         by its terms, terminated or under which the Company's rights or
         benefits may be impaired or adversely affected, in either case by
         reason of the execution of this Agreement, the closing of the Offer or
         the Merger, or the consummation of the other transactions contemplated
         hereby;

                  (E) any agreement, contract, policy, license, Permit,
         document, instrument, arrangement or commitment that limits in any
         material respect the freedom of the Company or any subsidiary of the
         Company to compete in any line of business or with any person or in any
         geographic area or which would so limit in any material respect the
         freedom of the Company or any subsidiary of the Company after the
         Effective Time; or

                  (F) any other agreement, contract, policy, license, Permit,
         document, instrument, arrangement or commitment not made in the
         ordinary course of business which is material to the Company and its
         subsidiaries taken as a whole;

excluding in any case any agreement, arrangement or instrument under which no
party has any continuing rights or obligations.

                  (ii) Neither the Company nor any subsidiary of the Company is
in default in any material respect under the terms of any exclusive license or
distribution agreement or arrangement that, by its terms, provides for payments
to the Company or any of its subsidiaries of $1,000,000 or more



                                      -17-
<PAGE>

per annum, true and complete copies or descriptions of all of which have been
delivered to Parent, or any other material license or distribution agreement or
arrangement. To the knowledge of the Company, none of the parties to any of the
contracts identified in Section 4.1(p)(i) of the Disclosure Schedule or
otherwise disclosed in the Company Filed SEC Documents has terminated, or in any
way expressed an intent to materially reduce or terminate the amount of, its
business with the Company or any of its subsidiaries in the future.

                  (iii) Set forth in Section 4.1(p)(iii) of the Disclosure
Schedule are (A) a list of (I) all loan or credit agreements, notes, bonds,
mortgages, indentures and other agreements and instruments pursuant to which any
indebtedness of the Company or any of its subsidiaries in an aggregate principal
amount in excess of $2,500,000 is outstanding or may be incurred and (II) the
respective principal amounts currently outstanding thereunder and (B) a schedule
of (I) each contract, agreement or arrangements which, because of the Company's
entering into this Agreement, either require the Company or Parent to make a
payment or reduce a charge under such agreement and (II) the Company's best
estimate of the amount of such payment. For purposes of this Section
4.1(p)(iii), "INDEBTEDNESS" shall mean, with respect to any person, without
duplication, (A) all obligations of such person for borrowed money, or with
respect to deposits or advances of any kind to such person, (B) all obligations
of such person evidenced by bonds, debentures, notes or similar instruments, (C)
all obligations of such person upon which interest charges are customarily paid,
(D) all obligations of such person under conditional sale or other title
retention agreements relating to property purchased by such person, (E) all
obligations of such person issued or assumed as the deferred purchase price of
property or services (excluding obligations of such person to creditors for raw
materials, inventory, services and supplies incurred in the ordinary course of
such person's business), (F) all capitalized lease obligations of such person,
(G) all obligations of others secured by any Lien on property or assets owned or
acquired by such person, whether or not the obligations secured thereby have
been assumed, (H) all obligations of such person under interest rate or currency
swap transactions (valued at the termination value thereof), (I) all letters of
credit issued for the account of such person (excluding letters of credit issued
for the benefit of suppliers to support accounts payable to suppliers incurred
in the ordinary course of business), (J) all obligations of such person to
purchase securities (or other property) which arises out of or in connection
with the sale of the same or substantially similar securities or property, and
(K) all guarantees and arrangements having the economic effect of a guarantee of
such person of any indebtedness of any other person.

                  (q) OPINION OF FINANCIAL ADVISOR. The Company has received the
opinion of CSFB, dated the date hereof, a copy of which has been or, within two
business days of the date hereof, will be provided to Parent, to the effect
that, as of such date, the consideration to be paid in the Offer and the Merger
is fair to the Company's stockholders from a financial point of view.

                  (r) INTERESTS OF OFFICERS AND DIRECTORS. Except as set forth
in Section 4.1(r) of the Disclosure Schedule, to the Company's knowledge, none
of the Company's or any of its subsidiaries' officers or directors has any
direct or indirect interest in any property, real or personal, tangible or
intangible, including inventions, patents, copyrights, trademarks, trade names,
trade secrets or know-how, used in or pertaining to the business of the Company
or that of its subsidiaries, or any supplier, distributor or customer of the
Company or any of its subsidiaries, except for the normal rights of a
stockholder and rights under existing employee benefit plans and except for any
such interest which would not be required to be disclosed under the Exchange
Act.

                                      -18-
<PAGE>

                  (s) TECHNOLOGY. (i) The Company exclusively owns, without
restrictions, or is licensed to use, the rights to all patents, trademarks,
trade names, service marks, copyrights and any applications therefor, maskworks,
net lists, schematics, inventories, technology, trade secrets, source codes,
know-how, computer software programs or applications and tangible or intangible
proprietary information or material that in any material respect are used in the
business of the Company and any of its subsidiaries as currently conducted (the
"COMPANY INTELLECTUAL PROPERTY RIGHTS"). Section 4.1(s)(i) of the Disclosure
Schedule lists: (A) all patents, trademarks, trade names, service marks,
registered and unregistered copyrights, and any applications therefor included
in the Company Intellectual Property Rights, together with a list of all of the
Company's currently marketed software products and a list of which, if any, of
such products have been registered for copyright protection with the United
States Copyright Office and any foreign offices; and (B) all licenses and other
agreements to which the Company or any of its subsidiaries is a party and
pursuant to which the Company or any of its subsidiaries is authorized to use
any Company Intellectual Property Right, that is material to the licensing by
the Company or any subsidiary of its software products to end users and includes
the identities of the parties thereto, a description of the nature and subject
matter thereof, the applicable royalty and the term thereof. Neither the Company
nor any of its subsidiaries is, or as a result of the execution, delivery or
performance of the Company's obligations hereunder will be, in violation of, or
lose any rights pursuant to, any license or agreement described in Section
4.1(s)(i) of the Disclosure Schedule.

                  (ii) No claims with respect to the Company Intellectual
Property Rights have been asserted or, to the knowledge of the Company, are
threatened by any person nor does the Company or any subsidiary of the Company
know of any valid grounds for any bona fide claims (A) to the effect that the
manufacture, sale or use of any product or process as now used or offered or
proposed for use or sale by the Company or any subsidiary of the Company
infringes on any copyright, trade secret, patent or other intellectual property
right of any person, (B) against the use by the Company or any subsidiary of the
Company of any Company Intellectual Property Rights, or (C) challenging the
ownership, validity or effectiveness of any of the Company Intellectual Property
Rights. All granted and issued patents and all registered trademarks and service
marks listed in Section 4.1(s)(i) of the Disclosure Schedule and all copyrights
held by the Company or any of its subsidiaries are valid, enforceable and
subsisting. To the Company's knowledge, there has not been and there is not any
material unauthorized use, infringement or misappropriation of any of the
Company Intellectual Property Rights by any third party, employee or former
employee.

                  (iii) Except as set forth in Section 4.1(s)(i) of the
Disclosure Schedule, no owned Company Intellectual Property Right is subject to
any outstanding order, judgment, decree, stipulation or agreement restricting in
any material manner the licensing thereof by the Company or any of its
subsidiaries. Neither the Company nor any of its subsidiaries has entered into
any agreement to indemnify any other person against any charge of infringement
of any Company Intellectual Property Right. Except for the Company's end-user
licenses, neither the Company nor any of its subsidiaries has entered into any
agreement granting any third party the right to bring infringement actions with
respect to, or otherwise to enforce rights with respect to, any Company
Intellectual Property Right. The Company and its subsidiaries have the exclusive
right to file, prosecute and maintain all applications and registrations with
respect to the Company Intellectual Property Rights that are owned by the
Company or any of its subsidiaries.

                  (t) CHANGE OF CONTROL. Except as set forth in Section 4.1(i),
4.1(p)(i)(A) or 4.1(t) of the Disclosure Schedule, the execution and delivery of
this Agreement and the consummation of the transactions 



                                      -19-
<PAGE>

contemplated hereby will not (i) result in or increase the amount of any 
payment or benefit (including a payment or benefit contingent on the 
occurrence of one or more events including, without limitation, termination 
of employment) becoming due to any current or former employee, director or 
independent contractor of the Company or any of its subsidiaries, from the 
Company or any of its subsidiaries under the terms of any Stock Plan, Benefit 
Plan, agreement or otherwise, or (ii) result in the acceleration of the time 
of payment, exercise or vesting of any such payment or benefits.

                  (u) RIGHTS AGREEMENT. The Company has delivered to Parent a
complete copy of the Rights Agreement, including all amendments and exhibits
thereto. The Company has taken, and as soon as possible after the date hereof
(but in no event later than two business days after the date hereof), the Rights
Agent will take, all actions necessary or appropriate to amend the Rights
Agreement to ensure that the execution of this Agreement and the Stockholder
Option Agreement, the announcement or making of the Offer, the acquisition of
Shares pursuant to the Offer, the Merger and the Stockholder Option Agreement
and the other transactions contemplated in this Agreement and the Stockholder
Option Agreement will not cause (i) Parent or any of its affiliates to be
considered an Acquiring Person (as defined in the Rights Agreement), (ii) the
occurrence of the Distribution Date or Shares Acquisition Date (each as defined
in the Rights Agreement) or (iii) the separation of the Rights from the
underlying Shares, and will not give the holders thereof the right to acquire
securities of any party thereto.

                  (v) 1999 OPTIONS. The Company Options issued in 1999 pursuant
to the Stock Plans have been issued to employees on a compensation basis and for
the purposes consistent with prior issuances by the Company and were not issued
in contemplation of the transactions contemplated by this Agreement.

                  (w) YEAR 2000 COMPLIANCE. The Company's web site
(http://www.platinum.com/ year2klt.htm), accurately sets forth the Y2K
compliance status of the Company's products in all material respects. The
Company's disclosure in the Company's 1999 10-K under the caption "Year 2000
Considerations" accurately sets forth in all material respects the Company's
Year 2000 compliance status regarding its internal systems, including IT and
non-IT systems, and technical infrastructure.

                  SECTION 4.2. REPRESENTATIONS AND WARRANTIES OF PARENT AND
MERGER SUBSIDIARY. Parent and Merger Subsidiary represent and warrant to the
Company as follows:

                  (a) ORGANIZATION, STANDING AND CORPORATE POWER. Each of Parent
and Merger Subsidiary is a corporation duly organized, validly existing and in
good standing under the laws of the jurisdiction of its incorporation and has
the requisite corporate power and authority to carry on its business as now
being conducted.

                  (b) AUTHORITY; NONCONTRAVENTION. Parent and Merger Subsidiary
have all requisite corporate power and authority to enter into this Agreement
and to consummate the transactions contemplated by this Agreement. The execution
and delivery of this Agreement and the consummation of the transactions
contemplated by this Agreement have been duly authorized by all necessary
corporate action on the part of Parent and Merger Subsidiary. This Agreement has
been duly executed and delivered by Parent and Merger Subsidiary and, assuming
this Agreement constitutes a valid and binding agreement of the Company,
constitutes a valid and binding obligation of such party, enforceable against
such party in accordance with its terms. The execution and delivery of this
Agreement do not, and the consummation of the transactions contemplated by this
Agreement and



                                      -20-
<PAGE>

compliance with the provisions of this Agreement will not, conflict with, or
result in any violation of, or default (with or without notice or lapse of time,
or both) under, or give rise to a right of termination, cancellation or
acceleration of any obligation or to loss of a material benefit under, or result
in the creation of any Lien upon any of the properties or assets of Parent or
any of its subsidiaries under, (i) the certificate of incorporation or by-laws
of Parent or Merger Subsidiary or the comparable charter or organizational
documents of any other subsidiary of Parent, (ii) any loan or credit agreement,
note, bond, mortgage, indenture, lease or other agreement, instrument, permit,
concession, franchise or license applicable to Parent or Merger Subsidiary or
their respective properties or assets or (iii) subject to the governmental
filings and other matters referred to in the following sentence, any judgment,
order, decree, statute, law, ordinance, rule or regulation applicable to Parent,
Merger Subsidiary or any other subsidiary of Parent or their respective
properties or assets, other than, in the case of clause (ii) or (iii), any such
conflicts, violations, defaults, rights or Liens that individually or in the
aggregate would not (A) have a material adverse effect on Parent and its
subsidiaries taken as a whole, (B) impair the ability of Parent and Merger
Subsidiary to perform their respective obligations under this Agreement or (C)
prevent the consummation of any of the transactions contemplated by this
Agreement. No Consent is required by or with respect to Parent, Merger
Subsidiary or any other subsidiary of Parent in connection with the execution
and delivery of this Agreement or the consummation by Parent or Merger
Subsidiary, as the case may be, of any of the transactions contemplated by this
Agreement, except for (i) the filing of a premerger notification and report form
under the HSR Act, (ii) compliance with any applicable requirements of the
Exchange Act, (iii) the filing of a certificate of merger in accordance with
Delaware Law and appropriate documents with the relevant authorities of other
states in which the Company is qualified to do business and (iv) such other
consents, approvals, orders, authorizations, registrations, declarations and
filings as (A) may be required under the laws of any foreign country in which
the Company or any of its subsidiaries conducts any business or owns any
property or assets or (B) as to which the failure to obtain or make could not
reasonably be expected to (x) have a material adverse effect on Parent and its
subsidiaries taken as a whole or (y) prevent or materially delay the
consummation of any of the transactions contemplated by this Agreement.

                  (c) DISCLOSURE DOCUMENTS. (i) The information with respect to
Parent and its subsidiaries that Parent furnishes to the Company in writing
specifically for use in any Company Disclosure Document will not contain, any
untrue statement of a material fact or omit to state any material fact necessary
in order to make the statements made therein, in the light of the circumstances
under which they were made, not misleading (A) in the case of the Company Proxy
Statement at the time the Company Proxy Statement or any amendment or supplement
thereto is first mailed to stockholders of the Company and at the time the
stockholders vote on adoption of this Agreement, and (B) in the case of any
Company Disclosure Document other than the Company Proxy Statement, at the time
of the filing thereof and at the time of any distribution thereof.

                  (ii) The Offer Documents, when filed, will comply as to form
in all material respects with the applicable requirements of the Exchange Act
and will not at the time of the filing thereof, at the time of any distribution
thereof or at the time of consummation of the Offer, contain any untrue
statement of a material fact or omit to state any material fact necessary to
make the statements made therein, in the light of the circumstances under which
they were made, not misleading, PROVIDED, that this representation and warranty
will not apply to statements or omissions in the Offer Documents based upon
information furnished to Parent or Merger Subsidiary in writing by the Company
specifically for use therein.

                                      -21-
<PAGE>

                  (d) FINANCING. Parent will provide or cause to be provided to
Merger Subsidiary the funds necessary to consummate the Offer and the Merger in
accordance with the terms of this Agreement.

                  (e) DELAWARE LAW. As of the time immediately prior to the
execution of this Agreement, neither Parent nor any of its subsidiaries was (i)
an "INTERESTED STOCKHOLDER", as such term is defined in Section 203 of the
Delaware Law or (ii) an Acquiring Person under the Rights Agreement.


                                   ARTICLE V

                            COVENANTS OF THE COMPANY


                  SECTION 5.1. CONDUCT OF BUSINESS. During the period from the
date of this Agreement to the Effective Time, the Company shall, and shall cause
its subsidiaries to, carry on their respective businesses in the ordinary course
in substantially the same manner as heretofore conducted and, to the extent
consistent therewith, use all reasonable efforts to preserve intact their
current business organizations, keep available the services of their current
officers and employees and preserve their relationships with customers,
suppliers, licensors, licensees, distributors and others having business
dealings with them. Without limiting the generality of the foregoing, during the
period from the date of this Agreement to the Effective Time, the Company shall
not, and shall not permit any of its subsidiaries to, without the prior written
approval of Parent:

                  (a) (i) declare, set aside or pay any dividends on, or make
any other distributions in respect of, any of its capital stock, other than
dividends and distributions by any direct or indirect wholly owned subsidiary of
the Company to its parent, (ii) 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 or (iii) purchase,
redeem or otherwise acquire any shares of capital stock of the Company or any of
its subsidiaries or any other securities thereof or any rights, warrants or
options to acquire any such shares or other securities (other than in connection
with the exercise of Company Options);

                  (b) issue, deliver, sell, pledge or otherwise encumber any
shares of its capital stock, any other voting securities or any securities
convertible into, or any rights, warrants or options to acquire, any such
shares, voting securities or convertible securities (other than (i) the issuance
of Shares upon the exercise of Company Options outstanding on the date of this
Agreement in accordance with their terms on such date (ii) conversion of
Convertible Subordinated Notes into Shares, (iii) conversion of Series B Stock,
(iv) issuances under the Stock Purchase Plan and (v) in the event that, for
ministerial reasons, the delivery of the certificates of the 13,750,523 Shares
and options for 3,328,113 Shares pursuant to the Memco acquisition (which are
included in the outstanding shares under Section 2.1(c)) has not been completed
by the time this Agreement is entered into, the completion of the issuance of
such Shares and option for such Shares in such amounts);

                                      -22-
<PAGE>

                  (c) amend its articles or certificate of incorporation,
by-laws or other comparable charter or organizational documents (other than
immaterial changes, such as mergers of subsidiaries of the Company with other
subsidiaries to implement the Company's internal restructuring);

                  (d) acquire or agree to acquire (including, without
limitation, by merger, consolidation or acquisition of stock or assets) any
business, including through the acquisition of any interest in any corporation,
partnership, joint venture, association or other business organization or
division thereof;

                  (e) (i) mortgage or otherwise encumber or subject to any Lien,
any of the Company Intellectual Property Rights or any other material properties
or assets, (ii) except in the ordinary course of business consistent with past
practice and pursuant to existing contracts or commitments, sell, lease,
transfer or otherwise dispose of any of the Company Intellectual Property Rights
or any other material properties or assets, or (iii) except in the ordinary
course of business consistent with past practice or pursuant to existing
contracts or commitments, license any of the Company Intellectual Property
Rights;

                  (f) make or agree to make any new capital expenditures in
excess of $500,000;

                  (g) make any material tax election (unless required by law) or
settle or compromise any material income tax liability;

                  (h) pay, discharge or satisfy any claims, liabilities or
obligations (absolute, accrued, asserted or unasserted, contingent or
otherwise), other than the payment, discharge or satisfaction, in the ordinary
course of business consistent with past practice and in accordance with their
terms, of (i) liabilities reflected or reserved against in, or contemplated by,
the most recent consolidated financial statements (or the notes thereto) of the
Company included in the Company Filed SEC Documents or (ii) liabilities incurred
in the ordinary course of business consistent with past practice, or, subject to
the fiduciary duties of the Board of Directors of the Company as advised in
writing by Katten Muchin & Zavis, counsel to the Company, waive the benefits of,
or agree to modify in any manner, any confidentiality, standstill or similar
agreement to which the Company or any of its subsidiaries is a party;

                  (i) commence a lawsuit other than (i) for the routine
collection of bills or (ii) to enforce this Agreement or (iii) in such cases
where the Company in good faith determines that the failure to commence suit
would result in a material impairment of a valuable aspect of the Company's
business, provided that the Company consults with Parent prior to filing such
suit;

                  (j) (i) enter into or amend any employment or severance
agreement or similar arrangements, (ii) enter into any agreement pursuant to
which the Company or any of it subsidiaries will provide services for a term of
more than 30 days at a fixed or capped price or otherwise pursuant to terms that
are not consistent with agreements entered into by the Company or any of its
subsidiaries in the ordinary course of business, (iii) enter into any customer
sale or license agreement with non-standard terms or at discounts from list
prices in excess of 20%, (iv) pay commissions to sales employees except on the
basis of executed customer contracts with respect to products actually delivered
to customers, (v) enter into any contracts or series of related contracts in
excess of $250,000, (vi) enter into or amend any agreement or arrangement that
provides customers with enhanced rights or refunds of any nature upon a change
of control of the Company or its affiliates, (vii) enter into any customer
agreements providing for product replacements, (viii) enter into or amend any
contract to 




                                      -23-
<PAGE>

provide for "YEAR 2000" remediation services, (ix) make any determination as to
amounts payable under any plan, arrangement, or agreement, providing for
discretionary incentive compensation or bonus to any officer, director, employee
or independent contractor of the Company or any of its subsidiaries or (x) enter
into, adopt, or amend any agreement, arrangement, or Benefit Plan so as to
increase the liability (whether or not contingent) of the Company or the Parent
or any of their subsidiaries in respect of compensation or benefits except as
may be required by law; or

                  (k) authorize any of, or commit or agree to take any of, the
foregoing actions.

                  Parent acknowledges and agrees that the terms of this Section
5.1 do not prevent (i) payment of reasonable professional fees and expenses as a
result of or in connection with the Company's negotiation or execution of this
Agreement or the performance of the Company's obligations hereunder, (ii) the
Company from implementing April 1, 1999 salary increases that have already been
announced to employees and provided they are not in excess of 6% in the
aggregate, (iii) paying employee, sales and other bonuses that accrued prior to
the date hereof and (iv) the creation of a "Rabbi" severance trust and the
funding of the severance payments for the top three executives in the amounts
described in Section 4.1(g) of the Disclosure Schedule.

                  SECTION 5.2. STOCKHOLDER MEETING; PROXY MATERIAL. The Company
shall cause a meeting of its stockholders (the "COMPANY STOCKHOLDER MEETING") to
be duly called and held as soon as reasonably practicable following Merger
Subsidiary's acquisition of Shares in the Offer for the purpose of voting on the
approval and adoption of this Agreement and the Merger unless a vote of
stockholders of the Company is not required by Delaware Law. The Directors of
the Company shall, subject to their fiduciary duties as advised in writing by
Katten Muchin & Zavis, counsel to the Company, recommend approval and adoption
of this Agreement and the Merger by the Company's stockholders. In connection
with such meeting, the Company (i) will promptly prepare and file with the SEC,
will use its best efforts to have cleared by the SEC and will thereafter mail to
its stockholders as promptly as practicable the Company Proxy Statement and all
other proxy materials for such meeting, (ii) subject to the fiduciary duties of
the Board of Directors of the Company as advised in writing by Katten Muchin &
Zavis, counsel to the Company, will use its best efforts to obtain the necessary
approvals by its stockholders of this Agreement and the transactions
contemplated hereby and (iii) will otherwise comply with all legal requirements
applicable to such meeting.

                  SECTION 5.3. ACCESS TO INFORMATION. From the date hereof until
the Effective Time and except as prohibited by any applicable statute, rule or
regulation of any Governmental Entity, the Company will give Parent, its
counsel, financial advisors, auditors and other authorized representatives
access (during normal business hours and upon reasonable notice) to the offices,
properties, books and records of the Company and the subsidiaries, will furnish
to Parent, its counsel, financial advisors, auditors and other authorized
representatives such financial and operating data and other information as such
persons may reasonably request and will instruct the Company's employees,
counsel and financial advisors to cooperate with Parent in its investigation of
the business of the Company and the subsidiaries; PROVIDED that no investigation
pursuant to this Section 5.3 shall affect any representation or warranty given
by the Company to Parent hereunder.

                  SECTION 5.4. OTHER OFFERS. Until the termination of this
Agreement, the Company and its subsidiaries will not, and will not authorize or
permit the officers, directors, employees or other agents of the Company and its
subsidiaries to, directly or indirectly, (i) take any action to solicit,
initiate or encourage any Acquisition Proposal (defined below) or (ii) subject
to the fiduciary duties of the 



                                      -24-
<PAGE>

Board of Directors of the Company under applicable law, as advised in writing by
Katten Muchin & Zavis, counsel to the Company, and in response to an unsolicited
request therefor by a person who a majority of the Company's Board of Directors
believes intends to submit a Superior Acquisition Proposal (defined below),
engage in negotiations with, or disclose any nonpublic information relating to
the Company or any of its subsidiaries or afford access to the properties, books
or records of the Company or any of its subsidiaries to, any person that has
advised the Company or otherwise publicized the fact that such person may be
considering making, or that has made, an Acquisition Proposal; PROVIDED, nothing
herein shall prohibit the Company's Board of Directors from taking and
disclosing to the Company's stockholders a position with respect to a tender
offer pursuant to Rules 14d-9 and 14e-2 promulgated under the Exchange Act. The
Company will promptly notify Parent after receipt of any Acquisition Proposal or
any notice that any person is considering making an Acquisition Proposal or any
request for nonpublic information relating to the Company or any of its
subsidiaries or for access to the properties, books or records of the Company or
any of its subsidiaries by any person that has advised the Company or otherwise
publicized the fact that such person may be considering making, or that has
made, an Acquisition Proposal and will keep Parent fully informed of the status
and details of any such Acquisition Proposal, indication or request. For
purposes of this Agreement, "ACQUISITION PROPOSAL" means any offer or proposal
for, or any indication of interest in, a merger or other business combination
involving the Company or any of its subsidiaries or the acquisition of any
significant equity interest in, or a significant portion of the assets of, the
Company or any of its subsidiaries, other than the transactions contemplated by
this Agreement; and "SUPERIOR ACQUISITION PROPOSAL" means an Acquisition
Proposal which a majority of the disinterested directors determines in its good
faith judgment (based on advice of the Company's independent financial advisor)
to be more favorable to the Company's stockholders than the Offer or the Merger,
and for which financing, to the extent required, is then committed.

                  SECTION 5.5. STATE TAKEOVER STATUTES. If any "FAIR PRICE",
"CONTROL SHARE ACQUISITION", "MORATORIUM" or other anti-takeover statute, or
similar statute or regulation shall become applicable to this Agreement, the
Stockholder Option Agreement or any of the transactions contemplated hereby or
thereby, including, without limitation, the Offer or the Merger, the Company and
its Board of Directors shall take all action necessary to ensure that the Offer,
the Merger and the other transactions contemplated hereby and thereby, may be
consummated as promptly as practicable on the terms contemplated hereby and
otherwise to minimize the effect of such statute or regulation on the Offer, the
Merger and the other transactions contemplated hereby or thereby.


                                   ARTICLE VI
                     COVENANTS OF PARENT AND MERGER SUBSIDIARY


                  SECTION 6.1. OBLIGATIONS OF MERGER SUBSIDIARY. Parent will
take all action necessary to cause Merger Subsidiary to perform its obligations
under this Agreement and to consummate the Offer and the Merger on the terms and
conditions set forth in this Agreement.

                  SECTION 6.2. VOTING OF SHARES. Parent and Merger Subsidiary
agrees to make a quorum and vote all Shares acquired in the Offer or otherwise
beneficially owned by them in favor of adoption of this Agreement at the Company
Stockholder Meeting.

                                      -25-



<PAGE>


                  SECTION 6.3. INDEMNIFICATION. For six years after the
Effective Time, Parent and the Surviving Corporation will indemnify and hold
harmless the present and former officers, directors, employees and agents of the
Company (the "INDEMNIFIED PARTIES") in respect of acts or omissions occurring on
or prior to the Effective Time to the extent provided under the Company's
certificate of incorporation and bylaws in effect on the date hereof; provided
that such indemnification shall be subject to any limitation imposed from time
to time under applicable law. Parent will cause to be maintained for a period of
not less than two years from the Effective Time the Company's current directors'
and officers' insurance and indemnification policy to the extent that it
provides coverage for events occurring prior to the Effective Time (the "D&O
INSURANCE") for all persons who are directors and officers of the Company on the
date of this Agreement, so long as the annual premium therefor would not be in
excess of 105% of the amount per annum the Company paid in its last full fiscal
year, which amount has been disclosed to Parent. If the existing D&O Insurance
cannot be maintained, expires or is terminated or canceled during such two-year
period, Parent will use all reasonable efforts to cause to be obtained as much
D&O Insurance as can be obtained for the remainder of such period for an
annualized premium not in excess of 105% of the amount per annum the Company
paid in its last full fiscal year, which amount has been disclosed to Parent, on
terms and conditions substantially similar to the existing D&O Insurance.
Without limitation of the foregoing, in the event any such Indemnified Party is
or becomes involved in any capacity in any action, proceeding or investigation
in connection with any matter relating to the Merger, the Offer or this
Agreement occurring on or prior to the Effective Time, Parent shall pay as
incurred such Indemnified Party's reasonable legal and other expenses (including
the cost of any investigation and preparation) incurred in connection therewith.

                  SECTION 6.4. EMPLOYEES. Except as otherwise provided in
Section 2.5, Parent agrees to honor (or to cause the Surviving Corporation to
honor) in accordance with their terms all Benefit Plans (including employment
agreements) previously delivered to Parent and all accrued benefits vested
thereunder; it being understood and agreed that nothing in this Section 6.4
shall prevent Parent or the Surviving Corporation from terminating any such
Benefit Plan in accordance with its terms. For purposes of this Section 6.4, any
Benefit Plan that is a Company Filed SEC Document shall be deemed to have been
delivered to Parent.

                  SECTION 6.5. INTERIM FINANCING. In the event that at any time
the Company is subject to a material lack of cash liquidity and as a result the
Board of Directors of the Company declares a cash emergency, upon notice thereof
by the Company to Parent, Parent shall, if requested by the Company, work with
the Company during such time to help the Company secure necessary financing
through such efforts as Parent shall reasonably determine to be appropriate. The
foregoing shall not require any loan, guarantee or other economic support by
Parent or any payments by Parent to the Company or any other person. In the
event that such financing is not obtained by the Company and the cash emergency
is continuing notwithstanding the efforts made by Company and Parent as
described above, Parent shall, as a last resort, purchase such receivables of
the Company upon such terms as the Company and Parent shall mutually agree.


                                      -26-


<PAGE>


                                   ARTICLE VII

                              ADDITIONAL AGREEMENTS


                  SECTION 7.1. HSR ACT FILINGS; REASONABLE EFFORTS;
NOTIFICATION. (a) Each of Parent and the Company shall (i) promptly make or
cause to be made the filings required of such party or any of its subsidiaries
under the HSR Act with respect to the transactions contemplated by this
Agreement, (ii) comply at the earliest practicable date with any request under
the HSR Act for additional information, documents, or other material received by
such party or any of its subsidiaries from the Federal Trade Commission or the
Department of Justice or any other Governmental Entity in respect of such
filings or such transactions, and (iii) cooperate with the other party in
connection with any such filing and in connection with resolving any
investigation or other inquiry of any such agency or other Governmental Entity
under any Antitrust Laws (defined below) with respect to any such filing or any
such transaction. Each party shall promptly inform the other party of any
communication with, and any proposed understanding, undertaking, or agreement
with, any Governmental Entity regarding any such filings or any such
transaction. Subject to the provisions of Section 7.1(e), neither party shall
participate in any meeting with any Governmental Entity in respect of any such
filings, investigation, or other inquiry without giving the other party notice
of the meeting and, to the extent permitted by such Governmental Entity, the
opportunity to attend and participate.

                  (b) Each of Parent and the Company shall use all reasonable
efforts to resolve such objections, if any, as may be asserted by any
Governmental Entity with respect to the transactions contemplated by this
Agreement under the HSR Act, the Sherman Act, as amended, the Clayton Act, as
amended, the Federal Trade Commission Act, as amended, and any other federal,
state or foreign statutes, rules, regulations, orders or decrees that are
designed to prohibit, restrict or regulate actions having the purpose or effect
of monopolization or restraint of trade (collectively, "ANTITRUST LAWS"). In
connection therewith, if any administrative or judicial action or proceeding is
instituted (or threatened to be instituted) challenging any transaction
contemplated by this Agreement as violative of any Antitrust Law, and, if by
mutual agreement, Parent and the Company decide that litigation is in their best
interests, each of Parent and the Company shall cooperate and use all reasonable
efforts vigorously to contest and resist any such action or proceeding and to
have vacated, lifted, reversed, or overturned any decree, judgment, injunction
or other order, whether temporary, preliminary or permanent (each an "ORDER"),
that is in effect and that prohibits, prevents, or restricts consummation of any
such transaction. Each of Parent and the Company shall use all reasonable
efforts to take such action as may be required to cause the expiration of the
notice periods under the HSR Act or other Antitrust Laws with respect to such
transactions as promptly as possible after the execution of this Agreement.

                  (c) Subject to the fiduciary duties of the Board of Directors
of the Company as advised in writing by Katten Muchin & Zavis, counsel to the
Company, each of the parties agrees to use all reasonable 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 Offer, the Merger and the other transactions contemplated by
this Agreement, including (i) the obtaining of all other necessary actions or
nonactions, waivers, consents and approvals from Governmental Entities and the
making of all other necessary registrations and filings (including other filings
with Governmental Entities, if any), (ii) the obtaining of all necessary
consents, approvals or waivers from third parties, (iii) the preparation of the
Company Disclosure Documents and the Offer Documents, and (iv) the execution and
delivery of any


                                      -27-

<PAGE>


additional instruments necessary to consummate the transactions contemplated by,
and to fully carry out the purposes of, this Agreement.

                  (d) Notwithstanding anything to the contrary in Section
7.1(a), (b) or (c), but subject to the provisions of Section 7.1(e), (i) neither
Parent nor any of its subsidiaries shall be required to divest any of their
respective businesses, product lines or assets, (ii) neither Parent nor any of
its subsidiaries shall be required to take or agree to take any other action or
agree to any limitation that could reasonably be expected to have an adverse
effect on the business, assets, condition (financial or otherwise), results of
operations or prospects of Parent and its subsidiaries taken as a whole or of
Parent combined with the Surviving Corporation after the Effective Time, (iii)
neither the Company nor its subsidiaries shall be required to divest any of
their respective businesses, product lines or assets, or to take or agree to
take any other action or agree to any limitation that could reasonably be
expected to have a Material Adverse Effect, and (iv) no party shall be required
to agree to the imposition of or to comply with, any condition, obligation or
restriction on Parent or any of its subsidiaries or on the Surviving Corporation
or any of its subsidiaries of the type referred to in clause (a) or (b) of Annex
I and (v) neither Parent nor Merger Subsidiary shall be required to waive any of
the conditions to the Offer set forth in Annex I or any of the conditions to the
Merger set forth in Article VIII.

                  (e) Notwithstanding anything to the contrary in Section
7.1(a), (b), (c) or (d), the parties agree as follows:

                  (i) For a period of 90 days following the last to occur of (A)
substantial compliance by Parent and Merger Subsidiary with any request under
the HSR Act for additional information, documents, or other material received by
such party or any of its subsidiaries from the Federal Trade Commission or the
Department of Justice ("FTC/DOJ") and (B) substantial compliance by the Company
with any request under the HSR Act for additional information, documents, or
other material received by such party or any of its subsidiaries from FTC/DOJ,
Parent and Merger Subsidiary shall attempt to resolve any objections asserted by
FTC/DOJ generally as described in Section 7.1(b), (c) and (d).

                  (ii) If after the 90 day period set forth in Section
7.1(e)(i), objections continue to be asserted by FTC/DOJ which would threaten to
prevent completion of the Merger, (A) first, Parent and the Company shall
consult and mutually determine whether to litigate over the continuing
objections, or (B) if within five days Parent and the Company do not mutually
agree to litigate, the Company shall have the right for a period of 30 days to
meet separately with FTC/DOJ to develop a plan to resolve the continuing
objections, such resolution to be on a basis reasonably calculated to meet the
objections of the FTC/DOJ. During this period, the Company will continue to keep
Parent and Merger Subsidiary informed of its discussions and consult with Parent
and Merger Subsidiary on possible resolutions of the continuing objections.

                  (iii) After the Company and FTC/DOJ have agreed upon a plan,
Parent shall have a period of 90 days after such plan has been provided to
Parent in which to effect the plan, or a similar plan to which FTC/DOJ consents
or otherwise indicates its willingness for Parent to proceed so as to permit the
consummation of the Merger. Parent shall not be obligated to effect on the plan
in any specific manner and shall not be required to refrain from discussing
changes to the plan with either the Company or FTC/DOJ.


                                      -28-

<PAGE>


                  (iv) If Parent has not within the 90 day period completed
effecting the plan as contemplated by Section 7.1(e)(iii), then, Parent shall
choose one of the following:

                  (A) within 15 days, fully resolve any continuing objection or
         enter into a consent decree on reasonable terms setting forth the terms
         of the plan developed by the Company and FTC/DOJ under Section
         7.1(e)(ii), or

                  (B) (1) escrow an amount equal to the aggregate purchase price
         for the number of Shares representing the Minimum Condition, on terms
         outlined in Annex III to this Agreement, and (2) use all reasonable
         efforts vigorously to contest and resist any action or proceeding
         instituted by FTC/DOJ.

In the event that Parent chooses to contest or resist any action or proceeding
instituted by FTC/DOJ under Section 7.1(e)(iv), the Company shall fully
cooperate with and support Parent in such efforts.

                  (v) Parent may at any time, in lieu of continuing with the
provisions of Section 7.1(e)(i) through (iii), elect to immediately follow the
provisions of Section 7(e)(iv)(B).

                  (vi) In the event Parent has elected, pursuant to Section
7.1(e)(iv)(B), to contest or resist any action or proceeding instituted by
FTC/DOJ and a final, nonappealable order by a court of competent jurisdiction
has been issued which prevents the completion of the Merger, then Parent and the
Company will take the following steps:

                  (A) The Company will increase its Board of Directors from
         seven to 14 and elect seven members nominated by Parent. The new Board
         of Directors will work together to take all steps, including
         disposition of assets, to remove any FTC/DOJ objections to completing
         the Merger.

                  (B) In the event that, after 90 days, the new Board of
         Directors is unable to agree to a plan to resolve the FTC/DOJ
         objections, then the Board will delegate the responsibility to (1)
         develop a plan to resolve the FTC/DOJ objections to a three person
         committee of Sanjay Kumar (or in his absence, a designee of Parent's
         Board), Andrew J. Filipowski (or in his absence, a designee of the
         Company's Board) and a senior member of Credit Suisse First Boston and
         (2) execute such plan.

                  (f) Each party shall give prompt notice to the other parties
upon learning of (i) any representation or warranty made by it contained in this
Agreement was untrue or inaccurate in any respect as of the date hereof or (ii)
the failure by it to comply with or satisfy in any respect any covenant,
condition or agreement to be complied with or satisfied by it under this
Agreement; PROVIDED, that no such notification shall affect the representations,
warranties, covenants or agreements of the parties or the conditions to the
obligations of the parties under this Agreement.

                  (g) The Company shall give prompt notice to Parent, and Parent
or Merger Subsidiary shall give prompt notice to the Company, of:

                  (i) any notice or other communication from any person alleging
that the consent of such person is or may be required in connection with the
transactions contemplated by this Agreement;


                                      -29-

<PAGE>


                  (ii) any notice or other communication from any Governmental
Entity in connection with the transactions contemplated by this Agreement; and

                  (iii) any actions, suits, claims, investigations or
proceedings commenced or, to the best of its knowledge threatened against,
relating to or involving or otherwise affecting it or any of its subsidiaries
(x) which, in the case of the Company, if pending on the date of this Agreement
would have been required to have been disclosed pursuant to Section 4.1(g),
4.1(h), 4.1(i), 4.1(k), 4.1(l), 4.1(o) or (y) in the case of any party, which
relate to the consummation of the transactions contemplated by this Agreement.

                  SECTION 7.2. PUBLIC ANNOUNCEMENTS. Parent and Merger
Subsidiary, on the one hand, and the Company, on the other hand, will consult
with each other before issuing, and provide each other the opportunity to review
and comment upon, any press release or other public statements with respect to
the transactions contemplated by this Agreement, including the Offer and the
Merger, and shall not issue any such press release or make any such public
statement prior to such consultation, except as may be required by applicable
law, court process or by obligations pursuant to any listing agreement with any
national securities exchange. The parties agree that the initial press release
to be issued with respect to the transactions contemplated by this Agreement
will be in a form agreed to by the parties. Parent acknowledges that the Company
will file (i) a Form 8-K disclosing this Agreement and attaching this Agreement
as an exhibit, and (ii) a Form 8-A/A relating to the Amendment to the Rights
Agreement.

                  SECTION 7.3. RIGHTS AGREEMENT. The Board of Directors of the
Company shall take all further action (in addition to that referred to in
Section 4.1(u)) requested in writing by Parent (including redeeming the Rights
immediately prior to the Effective Time of the Merger or amending the Rights
Agreement) in order to render the Rights inapplicable to the Offer, the Merger
and the other transactions contemplated by this Agreement and the Stockholder
Option Agreement. Except as expressly provided in this Agreement or as requested
in writing by Parent, the Board of Directors of the Company shall not (i) amend
the Rights Agreement or (ii) take any action with respect to, or make any
determination under, the Rights Agreement (including a redemption of the
Rights).


                                  ARTICLE VIII

                            CONDITIONS TO THE MERGER


                  SECTION 8.1. CONDITIONS TO THE OBLIGATIONS OF EACH PARTY. The
obligations of the Company, Parent and Merger Subsidiary to consummate the
Merger are subject to the satisfaction of the following conditions:

                  (i) if required by Delaware Law, this Agreement shall have
been adopted by the stockholders of the Company in accordance with such Law;

                  (ii) any applicable waiting period under the HSR Act relating
to the Merger shall have expired;


                                      -30-

<PAGE>


                  (iii) no provision of any applicable law or regulation and no
judgment, injunction, order or decree shall prohibit the consummation of the
Merger;

                  (iv) Parent or Merger Subsidiary shall have purchased Shares
in an amount equal to at least the Minimum Condition pursuant to the Offer; and

                  (v) other than the filing of articles of merger in accordance
with Delaware Law, all Consents required to permit the consummation of the
Merger including those set forth in Sections 4.1(d) and 4.2(b) shall have been
filed, occurred or been obtained, other than those the absence of which would
not have a Material Adverse Effect.


                                   ARTICLE IX

                                   TERMINATION


                  SECTION 9.1. TERMINATION. This Agreement may be terminated and
the Merger may be abandoned at any time prior to the Effective Time
(notwithstanding any approval of this Agreement by the stockholders of the
Company):

                       (a) by mutual written consent of the Company and Parent;

                       (b) subject to Section 7.1(e), by either the Company or
             Parent, if there shall be any law or regulation that makes
             consummation of the Merger illegal or otherwise prohibited;

                       (c) by the Company (y) if Parent shall have failed to
             commence the Offer within five business days following the date of
             this Agreement or (z) if the Offer shall have been terminated
             without Parent or Merger Subsidiary having purchased any Shares
             pursuant to the Offer;

                       (d) by Parent, (y) upon the occurrence of any Trigger
             Event described in clauses (i) through (iv) of Section 10.4(b) or
             (z) if the Offer shall have expired or been terminated, in
             accordance with the terms of this Agreement without Parent or
             Merger Subsidiary having purchased any Shares pursuant to the
             Offer; or

                       (e) by the Company, at any time after the 60th day
             following the later of (i) the date the HSR Act waiting period
             expires and (ii) the first date the conditions set forth in clause
             (a) and (b) of Annex I cease to exist.

                       (f) by the Company, upon the occurrence of any Trigger
             Event described in clause (iv) of Section 10.4(b).

                  SECTION 9.2. EFFECT OF TERMINATION. If this Agreement is
terminated pursuant to Section 9.1, this Agreement shall become void and of no
effect with no liability on the part of any party hereto or their respective
officers and directors, except that the agreements contained in Sections 10.4,
10.6 and 10.8 shall survive the termination hereof and except to the extent that
such termination results


                                      -31-

<PAGE>


from the material breach by a party of any representations, warranties,
covenants or agreements set forth in this Agreement.


                                    ARTICLE X

                               GENERAL PROVISIONS


                  SECTION 10.1. 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 10.1 shall not limit any covenant or agreement of the parties
which by its terms contemplates performance after the Effective Time.

                  SECTION 10.2. NOTICES. All notices, requests and other
communications under this Agreement shall be in writing and shall be deemed
given if delivered personally or sent by overnight courier (providing proof of
delivery) or by telecopy (with copies by overnight courier) 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 Parent or Merger Subsidiary, to

                        Computer Associates International, Inc.
                        One Computer Associates Plaza
                        Islandia, New York  11788-7000

                        Attention: Sanjay Kumar
                                   President and Chief Operating Officer
                        Fax:  516-342-3300

                        with a copy to:

                        Howard, Smith & Levin LLP
                        1330 Avenue of the Americas
                        New York, New York  10019

                        Attention:  Scott F. Smith
                        Fax:  212-841-1010

                  (b)   if to the Company, to

                        PLATINUM TECHNOLOGY International, INC.
                        1815 South Meyers Road
                        Oakbrook Terrace, Illinois  60181

                        Attention:  Andrew J. Filipowski
                        Fax:  630-691-0411


                                      -32-

<PAGE>


                        with a copy to:

                        Katten Muchin & Zavis
                        525 West Monroe Street
                        Suite 1600
                        Chicago, Illinois  60661-3693

                        Attention:  Arthur Hahn
                        Fax:  312-902-1061

                  SECTION 10.3. AMENDMENTS; NO WAIVERS. (a) Any provision of
this Agreement may be amended or waived prior to the Effective Time if, and only
if, such amendment or waiver is in writing and signed, in the case of an
amendment, by the Company, Parent and Merger Subsidiary or in the case of a
waiver, by the party against whom the waiver is to be effective; PROVIDED that
after the adoption of this Agreement by the stockholders of the Company, no such
amendment or waiver shall, without the further approval of such stockholders,
alter or change (i) the amount or kind of consideration to be received in
exchange for any shares of capital stock of the Company, (ii) any term of the
certificate of incorporation of the Surviving Corporation or (iii) any of the
terms or conditions of this Agreement if such alteration or change would
adversely affect the holders of any shares of capital stock of the Company.

                  (b) No failure or delay by any party in exercising any right,
power or privilege hereunder shall operate as a waiver thereof nor shall any
single or partial exercise thereof preclude any other or further exercise
thereof or the exercise of any other right, power or privilege. The rights and
remedies herein provided shall be cumulative and not exclusive of any rights or
remedies provided by law.

                  SECTION 10.4.  FEES AND EXPENSES.

                  (a) Except as otherwise provided in this Section, all costs
and expenses incurred in connection with this Agreement shall be paid by the
party incurring such cost or expense.

                  (b) The Company agrees to pay Parent a fee in immediately
available funds equal to $180,000,000 promptly, but in no event later than one
business day, after the termination of this Agreement as a result of the
occurrence of any of the events set forth below (a "TRIGGER EVENT"):

                  (i) the Company shall have entered into, or shall have
              publicly announced its intention to enter into, an agreement or 
              an agreement in principle with respect to any Acquisition 
              Proposal;

                  (ii) any representation or warranty made by the Company in, 
              or pursuant to, this Agreement that is qualified as to 
              materiality shall not have been true and correct when made, or 
              any representation or warranty made by the Company in, or 
              pursuant to, this Agreement that is not so qualified shall not 
              have been true and correct in all material respects when made, 
              or the Company shall have failed to observe or perform in any 
              material respect any of its obligations under this Agreement; 
              provided that it shall not be a Trigger Event unless either (A) 
              the breaches of the representations and warranties without 
              regard to any materiality qualifier or threshold, and failure 
              to perform or breach of any obligation, individually or in the 
              aggregate, could reasonably be


                                      -33-

<PAGE>


              expected to have a Material Adverse Effect or (B) the breaches 
              of the representations and warranties in Section 4.1(c), (l), 
              (n), (p)(i)(A) and (D) and (u) without regard to any 
              materiality qualifier or threshold, and failure to perform or 
              breach of any obligation, individually or in the aggregate, 
              could reasonably be expected to result in a loss or damage of 
              $22,500,000 or more;

                  (iii) the Board of Directors of the Company (or any special 
              committee thereof) shall have withdrawn or materially modified 
              in a manner adverse to Parent or Merger Subsidiary its approval 
              or recommendation of the Offer, the Merger or this Agreement or 
              its approval of the entry by Parent and Merger Subsidiary into 
              the Stockholder Option Agreement, in any such case whether or 
              not such withdrawal or modification is required by the 
              fiduciary duties of the Board of Directors (or any special 
              committee thereof); or

                  (iv) prior to the purchase of any Shares under the Offer, 
              the Company shall have received any Acquisition Proposal which 
              the Board or Directors has determined is more favorable to the 
              Company's shareholders than the transactions contemplated by 
              this Agreement, whether or not such determination is required 
              by the fiduciary duties of the Board of Directors.

                  (c) If this Agreement is terminated as a result of the
occurrence of a Trigger Event, in addition to any amounts paid or payable by the
Company to Parent pursuant to Section 10.4(b), the Company shall promptly assume
and pay, or reimburse Parent for, all fees payable and expenses incurred by
Parent (including the fees and expenses of its counsel) in connection with this
Agreement and the transactions contemplated hereby to a maximum of $10,000,000.

                  (d) In consideration of Parent entering into this Agreement,
substantially contemporaneously with entering into this Agreement, the Company
has paid to Parent a nonrefundable fee (or provided a direct draw Letter of
Credit in the amount) of $20,000,000.

                  SECTION 10.5. SUCCESSORS AND ASSIGNS. The provisions of this
Agreement shall be binding upon and inure to the benefit of the parties hereto
and their respective successors and assigns, provided that no party may assign,
delegate or otherwise transfer any of its rights or obligations under this
Agreement without the consent of the other parties hereto except that Merger
Subsidiary may transfer or assign, in whole or from time to time in part, to one
or more of Parent or any of its wholly-owned subsidiaries, the right to purchase
Shares pursuant to the Offer, but any such transfer or assignment will not
relieve Parent of its obligations to cause Merger Subsidiary or another
subsidiary to consummate the Offer or prejudice the rights of tendering
stockholders to receive payment for Shares validly tendered and accepted for
payment pursuant to the Offer.

                  SECTION 10.6. GOVERNING LAW. This Agreement shall be construed
in accordance with and governed by the law of the State of New York, except that
the consummation and effectiveness of the Merger shall be governed by, and
construed in accordance with, Delaware Law and the exercise by the Board of
Directors of the Company of its fiduciary duties as referenced herein shall be
governed by, and construed in accordance with, the law of the State of Delaware.

                  SECTION 10.7. COUNTERPARTS; EFFECTIVENESS; INTERPRETATION.
This Agreement may be signed in any number of counterparts, each of which shall
be an original, with the same effect as if the signatures thereto and hereto
were upon the same instrument. This Agreement shall become effective when each
party hereto shall have received counterparts hereof signed by all of the other
parties hereto.


                                      -34-

<PAGE>


When a reference is made in this Agreement to a Section, such reference shall be
to a Section of this Agreement unless otherwise indicated. 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.
Whenever the words "INCLUDE", "INCLUDES" or "INCLUDING" are used in this
Agreement, they shall be deemed to be followed by the words "WITHOUT
LIMITATION".

                  SECTION 10.8. ENFORCEMENT. The parties agree that irreparable
damage would occur in the event that any of the provisions of this Agreement
were not performed in accordance with their specific terms or were otherwise
breached. It is accordingly agreed that the parties shall be entitled to an
injunction or injunctions to prevent breaches of this Agreement and to enforce
specifically the terms and provisions of this Agreement in any court of the
United States or any state having jurisdiction, this being in addition to any
other remedy to which they are entitled at law or in equity.

                  SECTION 10.9. SEVERABILITY. If any term or other provision of
this Agreement is invalid, illegal or incapable of being enforced by any rule of
law or public policy, all other conditions and provisions of this Agreement
shall nevertheless remain in full force and effect. Upon such determination that
any term 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.

                  SECTION 10.10. ENTIRE AGREEMENT; NO THIRD PARTY BENEFICIARIES.
This Agreement and the Confidentiality Agreement dated as of March 24, 1999,
between the Company and the Parent (a) constitute the entire agreement and
supersede all prior agreements and understandings, both written and oral, among
the parties hereto with respect to the subject matter hereof, and (b) are not
intended to confer upon any person other than the parties hereto any rights or
remedies hereunder, other than rights to indemnity under Section 6.3.

                  SECTION 10.11. MATERIALITY; KNOWLEDGE. When used with respect
to the Company in this Agreement, the term "MATERIAL" means material to the
Company and its subsidiaries taken as a whole. Any representation in this
Agreement which is expressed as made to the Company's knowledge means the
knowledge, after reasonable investigation, of the following individuals: Andrew
J. Filipowski, Michael Cullinane, Larry S. Freedman, Paul L. Humenansky and 
Ken Mueller.


                                      -35-

<PAGE>


         The parties hereto have caused this Agreement to be signed by their
respective authorized officers as of the date first written above.

                                  Computer Associates International, Inc.



                                  By: /s/ Charles P. McWade
                                     ------------------------------------
                                     Name: Charles P. McWade
                                     Title: Senior Vice President


                                  HardMetal, Inc.


                                  By: /s/ Steven M. Woghin
                                     ------------------------------------
                                     Name: Steven M. Woghin
                                     Title: Vice President and Secretary



                                  PLATINUM Technology International, inc.



                                  By: /s/ Michael P. Cullinane
                                     ------------------------------------
                                     Name:  Michael P. Cullinane>
                                     Title: Executive Vice President
                                            and Chief Financial Officer


                                      -36-

<PAGE>


                                                                   ANNEX I


                  Notwithstanding any other provision of the Offer, Parent and
Merger Subsidiary shall not be required to accept for payment or (subject to any
applicable rules and regulations of the SEC, including Rule 14e-1(c) under the
Exchange Act (relating to Merger Subsidiary's obligation to pay for or return
tendered Shares after the termination or withdrawal of the Offer)) to pay for
any Shares, if by the expiration of the Offer (as it may be extended in
accordance with the requirements of Section 1.1), the Minimum Condition shall
not have been satisfied or at any time on or after March 29, 1999 and prior to
the acceptance for payment of Shares pursuant to the Offer, any of the following
conditions exist:

                  (a) there shall be instituted or pending any action or
         proceeding by any Governmental Entity, (i) challenging or seeking to
         make illegal, to delay materially or otherwise directly or indirectly
         to restrain or prohibit the acquisition by Merger Subsidiary or any of
         its affiliates of Shares pursuant to the Stockholder Option Agreement,
         the making of the Offer, the acceptance for payment of or payment for
         some of or all the Shares by Parent or Merger Subsidiary or the
         consummation by Parent or Merger Subsidiary of the Merger, seeking to
         obtain material damages or otherwise directly or indirectly relating to
         the transactions contemplated by the Stockholder Option Agreement, this
         Agreement, the Offer or the Merger, (ii) seeking to restrain or
         prohibit Parent's or Merger Subsidiary's ownership or operation (or
         that of their respective subsidiaries or affiliates) of all or any
         material portion of the business or assets of the Company and its
         subsidiaries, taken as a whole, or of Parent and its subsidiaries,
         taken as a whole, or to compel Parent or any of its subsidiaries or
         affiliates to dispose of or hold separate all or any material portion
         of the business or assets of the Company and its subsidiaries, taken as
         a whole, or of Parent and its subsidiaries, taken as a whole, (iii)
         seeking to impose material limitations on the ability of Parent or any
         of its subsidiaries or affiliates effectively to exercise full rights
         of ownership of the Shares, including, without limitation, the right to
         vote any Shares acquired or owned by Parent or any of its subsidiaries
         or affiliates on all matters properly presented to the Company's
         stockholders or (iv) seeking to require divestiture by Parent or any of
         its subsidiaries or affiliates of any Shares; or

                  (b) there shall be any action taken, or any statute, rule,
         regulation, injunction, order or decree proposed, enacted, enforced,
         promulgated, issued or deemed applicable to the Stockholder Option
         Agreement, this Agreement, the Offer or the Merger, by any Governmental
         Entity or arbitrator (other than (1) any such matters actually required
         pursuant to Section 7.1(e)(iv) or (vi) or (2) the application of the
         waiting period provisions of the HSR Act to the Stockholder Option
         Agreement, this Agreement, the Offer or the Merger) that, in the
         judgment of Parent, is substantially likely, directly or indirectly, to
         result in any of the consequences referred to in clauses (i) through
         (iv) of paragraph (a) above, subject as aforesaid; or

                  (c) there shall have occurred (i) any general suspension of
         trading in, or limitation on prices for, securities on any national
         securities exchange or in the over-


<PAGE>


         the-counter market in the United States, (ii) a declaration of a 
         banking moratorium or any suspension of payments in respect of banks 
         in the United States, (iii) any material limitation (whether or not 
         mandatory) by any Governmental Entity on the extension of credit by 
         banks or other lending institutions, (iv) a commencement of a war or 
         armed hostilities or other national or international calamity 
         directly or indirectly involving the United States which would 
         reasonably be expected to have a Material Adverse Effect or prevent 
         (or materially delay) the consummation of the Offer or (v) in the 
         case of any of the foregoing existing at the time of commencement of 
         the Offer, a material acceleration or worsening thereof; or

                  (d) any Consent (other than the filing of a certificate of
         merger or approval by the stockholders of the Company of the Merger (if
         required by Delaware Law)) required to be filed, occurred or been
         obtained by the Company or any of its subsidiaries in connection with
         the execution and delivery of this Agreement, the Offer and the
         consummation of the transactions contemplated by this Agreement shall
         not have been filed, occurred or been obtained (other than any such
         Consents the failure to file, occur or obtain in the aggregate, could
         not reasonably be expected to (i) have a Material Adverse Effect or
         (ii) prevent or materially delay the consummation of the Offer or the
         Merger); or

                  (e) the Company shall have breached or failed to perform in
         any material respect any of its covenants, obligations or agreements
         under this Agreement, or any of the representations and warranties of
         the Company set forth in this Agreement that is qualified as to
         materiality shall not be true when made, or any of the representations
         and warranties set forth in this Agreement that is not so qualified
         shall not be true in any material respect when made; provided that this
         condition shall not be deemed to exist unless either (i) such breaches
         or failures to perform any covenant, obligation or agreements, and any
         breach of representation or warranty without regard to any materiality
         qualifier or threshold, individually or in the aggregate, could
         reasonably be expected to have a Material Adverse Effect or (ii) the
         breaches of the representations and warranties in Section 4.1(c), (l),
         (n), (p)(i)(A) and (D) and (u) without regard to any materiality
         qualifier or threshold, and failure to perform or breach of any
         obligation, individually or in the aggregate, could reasonably be
         expected to result in a loss or damage of $22,500,000 or more; or

                  (f) this Agreement shall have been terminated in accordance
         with its terms; or

                  (g) the Board of Directors of the Company (or any special
         committee thereof) shall have withdrawn or materially modified in a
         manner adverse to Parent or Merger Subsidiary its approval or
         recommendation of the Offer, the Merger or this Agreement or its
         approval of the entry by Parent and Merger Subsidiary into the
         Stockholder Option Agreement; or

                  (h) the Company shall have entered into, or shall have
         publicly announced its intention to enter into, an agreement or
         agreement in principle with respect to any Acquisition Proposal; or


                                      -2-

<PAGE>


                  (i) the applicable waiting period under the HSR Act shall not
         have expired or been terminated;

which, in the judgment of Parent in any such case, and regardless of the
circumstances (including any action or omission by Parent or Merger Subsidiary)
giving rise to any such condition, makes it inadvisable to proceed with such
acceptance for payment or payment.

         The foregoing conditions are for the sole benefit of Parent and Merger
Subsidiary and may be asserted by Parent in its discretion regardless of the
circumstances (including any action or omission by Parent or Merger Subsidiary)
giving rise to any such condition or (other than the Minimum Condition) may,
subject to the terms of this Agreement, be waived by Parent and Merger
Subsidiary in their reasonable discretion in whole at any time or in part from
time to time. The failure by Parent or Merger Subsidiary at any time to exercise
its rights under any of the foregoing conditions shall not be deemed a waiver of
any such right; the waiver of any such right with respect to particular facts
and circumstances shall not be deemed a waiver with respect to any other facts
and circumstances, and each such right shall be deemed an ongoing right which
may be asserted at any time or from time to time.


                                      -3-


<PAGE>

                                                                EXHIBIT 99(c)(2)

                                                                  EXECUTION COPY

     AGREEMENT, dated as of March 29, 1999, among HardMetal, Inc., a Delaware
     corporation ("Buyer"), and the holders (the "Stockholders") of the shares
     of common stock, $0.001 par value (the "Shares") of PLATINUM TECHNOLOGY
     International, INC., a Delaware corporation (the "Company"), listed on the
     signature PAGES HEREOF.

     In order to induce Buyer and certain of its affiliates to enter into an
agreement and plan of merger (the "Merger Agreement") with the Company, Buyer
has requested the Stockholders, and the Stockholders have agreed, to enter into
this Agreement.

     The parties hereto agree as follows:

                                    ARTICLE I

                                  STOCK OPTION

     SECTION 1.1. GRANT OF STOCK OPTION. Each of the Stockholders hereby grants
to Buyer an irrevocable option (the "Option") to purchase the number of Shares
(including the associated Rights, as defined in the Merger Agreement) opposite
such Stockholder's name on the signature pages hereto and any additional Shares
(including such associated Rights) acquired by such Stockholder in any capacity
(whether by exercise of options, warrants or rights, the conversion or exchange
of convertible or exchangeable securities or by means of a purchase, dividend,
distribution or otherwise) (such "Stockholder's Shares" and, collectively, the
"Stockholder Shares") at a purchase price of $29.25 per Stockholder Share
(including such associated Rights) (as adjusted pursuant to Section 1.6, the
"Purchase Price").

     SECTION 1.2. EXERCISE OF OPTION. (a) Subject to the conditions set forth in
Section 1.5 hereof, the Option may be exercised by Buyer, in whole or in part,
at any time or from time to time after the date hereof and prior to the 30th
business day after the termination of the Merger Agreement in accordance with
the terms thereof. In the event Buyer wishes to exercise the Option for all or
some of the Stockholder Shares other than pursuant to the Offer (as defined in
the Merger Agreement), Buyer shall send a written notice (the "Exercise Notice")
to the Stockholders specifying the total number of Stockholder Shares it wishes
to purchase pursuant to such exercise (and the corresponding number of each such
Stockholder's Shares) and the place, the date (not less than one nor more than
20 business days from the date of the Exercise Notice) and the time for the
closing of such purchase, provided that such date and time may be earlier than
one day after the Exercise Notice if reasonably practicable. Each closing of a
purchase of Stockholder Shares pursuant to this Section 1.2(a) (a "Closing")
shall take place at the place, on the date and at the time designated by Buyer
in its Exercise Notice, provided that if, at the date of the Closing herein
provided for, the conditions set forth in Section 1.5 shall not have been
satisfied (or waived), Buyer may postpone the Closing until a date within five
business days after such conditions are satisfied.

     (b) Except to the extent otherwise provided in Section 1.2(c) below, Buyer
shall not be under any obligation to deliver any Exercise Notice and may allow
the Option to terminate without purchasing any Stockholder Shares hereunder;
provided however that once Buyer has 


<PAGE>


delivered to the Stockholders an Exercise Notice, subject to the terms and
conditions of this Agreement, Buyer shall be bound to effect the purchase as
described in such Exercise Notice.

     (c) Buyer agrees that, if Buyer shall have accepted Shares for payment and
purchased Shares pursuant to the Offer, Buyer shall, within ten business days of
such purchase, exercise the Option in its entirety (or any remaining portion of
the Option).

     SECTION 1.3. CLOSING. At the Closing, (a) each Stockholder shall deliver to
Buyer (in accordance with Buyer's instructions) a certificate or certificates
(the "Certificates") representing all of such Stockholder's Shares, duly
endorsed or accompanied by stock powers duly executed in blank and (b) Buyer
shall deliver to such Stockholder by wire transfer an amount equal to (i) the
number of such Stockholder's Shares being purchased at such Closing multiplied
by (ii) the Purchase Price (the "Purchase Amount").

     SECTION 1.4. AGREEMENT TO TENDER. Subject to the footnote at the end of
this Agreement, each of the Stockholders may tender and hereby agrees to validly
tender (or cause the record owner of such shares to validly tender) upon the
request of Buyer such Stockholder Shares. Upon receipt of instructions from the
Buyer, each Stockholder shall deliver to the depositary (the "Depositary")
designated in the Offer (i) a letter of transmittal with respect to such
Stockholder's Shares complying with the terms of the Offer together with
instructions directing the Depositary to make payment for such Shares directly
to the Stockholder (but if such Shares are not accepted for payment or are
withdrawn and are to be returned pursuant to the Offer, to return such Shares to
such Stockholder whereupon they shall continue to be held by such Stockholder
subject to the terms and conditions of this Agreement), (ii) the Certificates
and (iii) all other documents or instruments required to be delivered pursuant
to the terms of the Offer (such documents in clauses (i) through (iii)
collectively being hereinafter referred to as the "Tender Documents"). No tender
pursuant to this Section 1.4 will excuse any of the obligations of the
Stockholders hereunder.

     SECTION 1.5. CONDITIONS. The obligation of each Stockholder to sell
Stockholder Shares at any Closing is subject to the following conditions:

          (i) The representations and warranties of Buyer contained in Article
     IV shall be true and correct in all material respects on the date thereof
     as if made on such date;

          (ii) All waiting periods under the Hart-Scott-Rodino Antitrust
     Improvements Act of 1976, as amended, and the rules and regulations
     promulgated thereunder (the "HSR Act") applicable to such exercise of the
     Option shall have expired or been terminated;

          (iii) There shall be no preliminary or permanent injunction or other
     order, decree or ruling issued by a court of competent jurisdiction or by a
     governmental, regulatory or administrative agency or commission, nor any
     statute, rule, regulation or order promulgated or enacted by any
     governmental authority, prohibiting or otherwise restraining such exercise
     of the Option; and

          (iv) The Buyer shall have commenced the Offer.

     SECTION 1.6. ADJUSTMENT UPON CHANGES IN CAPITALIZATION OR MERGER. (a) In
the event of (i) any change in the Company's capital stock by reason of stock
dividends, stock splits, 

                                      -2-

<PAGE>


mergers, consolidations, recapitalizations, combinations, conversions, exchanges
of shares, extraordinary or liquidating dividends, or (ii) other changes in the
corporate or capital structure of the Company which would have the effect of
diluting or changing the Buyer's rights hereunder and which generally
proportionately affect the stockholders of the Company, then the number and kind
of shares or securities subject to the Option and the purchase price per
Stockholder Share (but not the total purchase price) shall be appropriately and
equitably adjusted so that the Buyer shall receive upon exercise of the Option
the number and class of shares or other securities or property that the Buyer
would have received in respect of the Stockholder Shares purchasable upon
exercise of the Option if the Option had been exercised immediately prior to
such event. Each Stockholder shall take such steps in connection with such
consolidation, merger, liquidation or other such action as may be necessary to
assure that the provisions hereof shall thereafter apply as nearly as possible
to any securities or property thereafter deliverable upon exercise of the
Option.

     (b) In the event the consideration per Share to be paid by Buyer pursuant
to the Offer is increased, the Purchase Price shall be similarly increased and
in the event the Closing hereunder shall have occurred, Buyer shall promptly pay
to each Stockholder the product of the amount of such increase in the Purchase
Price multiplied by the number of such Stockholder's Shares as to which the
Option has been exercised.

                                   ARTICLE II

                                 GRANT OF PROXY

     SECTION 2.1. PROXY. Each Stockholder hereby revokes any and all previous
proxies granted with respect to such Stockholder's Shares. Each Stockholder, by
this Agreement, with respect to such Stockholder's Shares, does hereby
constitute and appoint Buyer, or any nominee of Buyer, with full power of
substitution, as its true and lawful attorney and proxy, for and in its name,
place and stead, to vote each of such Stockholder's Shares as its proxy, at
every annual, special or adjourned meeting, or solicitation of consents, of the
stockholders of the Company (including the right to sign its name (as
stockholder) to any consent, certificate or other document relating to the
Company that the law of the State of Delaware may permit or require) (i) in
favor of the adoption of the Merger Agreement and this Agreement and approval of
the Merger and the other transactions contemplated hereby and by the Merger
Agreement, (ii) against any proposal for any recapitalization, merger, sale of
assets or other business combination between the Company and any person or
entity (other than the Merger) or any other action or agreement that would
result in a breach of any covenant, representation or warranty or any other
obligation or agreement of the Company under the Merger Agreement not being
fulfilled, and (iii) in favor of any other matter relating to consummation of
the transactions contemplated by the Merger Agreement and this Agreement. Each
Stockholder further agrees to cause such Stockholder's Shares that are
outstanding and owned by it beneficially to be voted in accordance with the
foregoing. The proxy granted by each Stockholder pursuant to this Article II is
irrevocable and is granted in consideration of Buyer's entering into this
Agreement and the Merger Agreement; PROVIDED, HOWEVER, that such proxy shall be
revoked upon termination of the Option's exercise period in accordance with its
terms other than for Shares which are the subject of a pending Closing
hereunder.


                                      -3-

<PAGE>


                                   ARTICLE III

                         REPRESENTATIONS AND WARRANTIES
                               OF THE STOCKHOLDERS

     Each of the Stockholders severally represents and warrants to the Buyer
that:

     SECTION 3.1. VALID TITLE. Except as set forth in the footnotes at the end
of this Agreement, such Stockholder is the sole, true, lawful and beneficial
owner of such Stockholder's Shares with no restrictions on such Stockholder's
voting rights or rights of disposition pertaining thereto. At any Closing, such
Stockholder will convey good and valid title to such Stockholder's Shares being
purchased free and clear of any and all claims, liens, charges, encumbrances and
security interests. Except as may be the case under the arrangements referenced
in the footnotes at the end of this Agreement, none of such Stockholder's Shares
is subject to any voting trust or other agreement or arrangement with respect to
the voting of such Shares.

     SECTION 3.2. NON-CONTRAVENTION. The execution, delivery and performance by
such Stockholder of this Agreement and the consummation of the transactions
contemplated hereby (i) are within such Stockholder's powers, have been duly
authorized by all necessary action (including any consultation, 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 required under the HSR Act), and (iii) do not and will not contravene
or constitute a default under, or give rise to a right of termination,
cancellation or acceleration of any right or obligation of such Stockholder or
to a loss of any benefit of such Stockholder under, any provision of applicable
law or regulation or of any agreement, judgment, injunction, order, decree, or
other instrument binding on such Stockholder or result in the imposition of any
lien on any asset of such Stockholder.

     SECTION 3.3. BINDING EFFECT. This Agreement has been duly executed and
delivered by such Stockholder and is the valid and binding agreement of such
Stockholder, enforceable against such Stockholder in accordance with its terms,
except as enforcement may be limited by bankruptcy, insolvency, moratorium or
other similar laws relating to creditors' rights generally. 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 such
Agreement.

     SECTION 3.4. TOTAL SHARES. Except as may be the case under the arrangements
referenced in the footnotes at the end of this Agreement, each Stockholder is
the record and Beneficial Owner of the number of Shares set forth next to such
Stockholder's name on the signature pages hereto. Such Shares constitute all of
the Shares owned of record or Beneficially Owned by such Stockholder. Except as
set forth on such signature pages, neither such Stockholder nor any beneficial
owner or owners of such Stockholder's Shares own any options to purchase or
rights to subscribe for or otherwise acquire any securities of the Company.
Except as may be the case under the arrangements referenced in the footnotes at
the end of this Agreement, each Stockholder has sole voting power and sole power
to issue instructions with respect to the matters set forth in Article II of
this Agreement, sole power of disposition, sole power of conversion, sole power
to demand appraisal rights and sole power to agree to all of the matters set
forth in this Agreement, in each case with respect to all of the Shares
beneficially owned by such Stockholder with no limitations, qualifications or
restrictions on such rights, subject to 

                                      -4-

<PAGE>


applicable securities laws and the terms of this Agreement. The terms
"Beneficially Own" or "Beneficial Ownership" with respect to any securities
shall mean having "beneficial ownership" of such securities as determined
pursuant to Rule 13d-3 under the Securities Exchange Act of 1934, as amended.

     SECTION 3.5. FINDER'S FEES. No investment banker, broker or finder is
entitled to a commission or fee from Buyer or the Company in respect of this
Agreement based upon any arrangement or agreement made by or on behalf of such
Stockholder.

                                   ARTICLE IV

                               REPRESENTATIONS AND
                               WARRANTIES OF BUYER

     The Buyer represents and warrants to each of the Stockholders:

     SECTION 4.1. CORPORATE POWER AND AUTHORITY. Buyer has all requisite
corporate power and authority to enter into this Agreement and to perform its
obligations hereunder. The execution, delivery and performance by Buyer of this
Agreement and the consummation by Buyer of the transactions contemplated hereby
have been duly authorized by the board of directors of Buyer and no other
corporate action on the part of Buyer is necessary to authorize the execution,
delivery or performance by Buyer of this Agreement and the consummation by Buyer
of the transactions contemplated hereby. This Agreement has been duly executed
and delivered by Buyer and is a valid and binding agreement of Buyer,
enforceable against it in accordance with its terms, except as enforcement may
be limited by bankruptcy, insolvency, moratorium or other similar laws relating
to creditors' rights generally.

     SECTION 4.2. ACQUISITION FOR BUYER'S ACCOUNT. Any Stockholder Shares to be
acquired upon exercise of the Option will be acquired by Buyer for its own
account and not with a view to the public distribution thereof and will not be
transferred except in compliance with the Securities Act of 1933.

                                    ARTICLE V

                          COVENANTS OF THE STOCKHOLDERS

     Each of the Stockholders hereby covenants and agrees that:

     SECTION 5.1. NO PROXIES FOR OR ENCUMBRANCES ON STOCKHOLDER SHARES. Except
pursuant to the terms of this Agreement, such Stockholder shall not, without the
prior written consent of Buyer, 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 (ii) acquire, sell, assign, transfer, encumber or
otherwise dispose of, or enter into any contract, option or other arrangement or
understanding with respect to the direct or indirect acquisition or sale,
assignment, transfer, encumbrance or other disposition of, any Shares during the
term of this Agreement, other than (y) the exercise of Options already owned by
such Stockholder and (z) transfers to family members or grantor trusts for the
benefit of family members where the transferee agrees in writing to be bound by
the terms hereof in an agreement satisfactory in form and substance to Parent.
Except as permitted by clauses (y) and (z) of the preceding sentences, 

                                      -5-

<PAGE>


such Stockholder shall not seek or solicit any such acquisition or sale,
assignment, transfer, encumbrance or other disposition or any such contract,
option or other arrangement or assignment or understanding and agrees to notify
Buyer promptly and to provide all details requested by Buyer if such Stockholder
shall be approached or solicited, directly or indirectly, by any person with
respect to any of the foregoing.

     SECTION 5.2. NO SHOPPING. Such Stockholder shall not directly or indirectly
(i) solicit, initiate or encourage (or authorize any person to solicit, initiate
or encourage) any inquiry, proposal or offer from any person to acquire the
business, property or capital stock of the Company or any direct or indirect
subsidiary thereof, or any acquisition of a substantial equity interest in, or a
substantial amount of the assets of, the Company or any direct or indirect
subsidiary thereof, whether by merger, purchase of assets, tender offer or other
transaction or (ii) subject to the fiduciary duty under applicable law of such
Stockholder as a director of the Company (if such Stockholder is such a
director) as further provided in the Merger Agreement, participate in any
discussion or negotiations regarding, or furnish to any other person any
information with respect to, or otherwise cooperate in any way with, or
participate in, facilitate or encourage any effort or attempt by any other
person to do or seek any of the foregoing. Such Stockholder shall promptly
advise Buyer of the terms of any communications it may receive relating to any
of the foregoing.

     SECTION 5.3. CONDUCT OF STOCKHOLDERS. Such Stockholder will not (i) take,
agree or commit to take any action that would make any representation and
warranty of such Stockholder hereunder inaccurate in any respect as of any time
prior to the termination of this Agreement or (ii) omit, or agree or commit to
omit, to take any action necessary to prevent any such representation or
warranty from being inaccurate in any respect at any such time.

     SECTION 5.4. DISCLOSURE. Each Stockholder hereby permits Buyer to publish
and disclose in the offer documents and, if approval of the Company's
shareholders is required under applicable law, a proxy statement (including all
documents and schedules filed with the SEC) their identity and ownership of the
Shares and the nature of their commitments, arrangements and understandings
under this Agreement.

                                   ARTICLE VI

                                  MISCELLANEOUS

     SECTION 6.1. EXPENSES. All costs and expenses incurred in connection with
this Agreement shall be paid by the party incurring such cost or expense.

     SECTION 6.2. FURTHER ASSURANCES. In the event the Buyer exercises the
Option, the Buyer and the Stockholders will each execute and deliver or cause to
be executed and delivered all further documents and instruments and use its best
efforts to secure such consents and take all such further action as may be
reasonably necessary in order to consummate the transactions contemplated hereby
or to enable the Buyer and any assignee to exercise and enjoy all benefits and
rights of the Stockholders with respect to the Option and the Stockholder
Shares.

     SECTION 6.3. ADDITIONAL AGREEMENTS. Subject to the terms and conditions of
this Agreement, each of the parties hereto agrees to use all reasonable efforts
to take, or cause to be taken, all action and to do, or cause to be done, all
things necessary, proper or advisable under 

                                      -6-

<PAGE>


applicable laws and regulations and which may be required under any agreements,
contracts, commitments, instruments, understandings, arrangements or
restrictions of any kind to which such party is a party or by which such party
is governed or bound, to consummate and make effective the transactions
contemplated by this Agreement.

     SECTION 6.4. SPECIFIC PERFORMANCE. The parties hereto agree that the Buyer
may be irreparably damaged if for any reason any Stockholder failed to sell such
Stockholder's Shares (or other securities deliverable pursuant to Section 1.5)
upon exercise of the Option or to perform any of its other obligations under
this Agreement, and that the Buyer would not have an adequate remedy at law for
money damages in such event. Accordingly, the Buyer shall be entitled to
specific performance and injunctive and other equitable relief to enforce the
performance of this Agreement by each Stockholder. This provision is without
prejudice to any other rights that the Buyer may have against any Stockholder
for any failure to perform its obligations under this Agreement.

     SECTION 6.5. NOTICES. All notices, requests, claims, demands and other
communications hereunder shall be deemed to have been duly given when delivered
in person, by telecopy, or by registered or certified mail (postage prepaid,
return receipt requested) to such party at its address set forth on the
signature page hereto.

     SECTION 6.6. SURVIVAL OF REPRESENTATIONS AND WARRANTIES. All
representations and warranties contained in this Agreement shall survive
delivery of and payment for the Stockholder Shares.

     SECTION 6.7. AMENDMENTS. This Agreement may not be modified, amended,
altered or supplemented, except upon the execution and delivery of a written
agreement executed by the parties hereto.

     SECTION 6.8. SUCCESSORS AND ASSIGNS. The provisions of this Agreement shall
be binding upon and inure to the benefit of the parties hereto and their
respective successors and assigns, PROVIDED that Buyer may assign its rights and
obligations to any affiliate of Buyer and PROVIDED, FURTHER, that no Stockholder
may assign, delegate or otherwise transfer any of its rights or obligations
under this Agreement without the consent of the Buyer.

     SECTION 6.9. GOVERNING LAW. This Agreement shall be construed in accordance
with and governed by the law of New York without giving effect to the principles
of conflicts of laws thereof.

     SECTION 6.10. JURISDICTION. Each of the parties hereto (a) consents to
submit itself to the exclusive personal jurisdiction of any court of the United
States located in the State of New York or of any New York state court in the
event any dispute arises out of this Agreement or the transactions contemplated
by this Agreement, and (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.

     SECTION 6.11. COUNTERPARTS; EFFECTIVENESS. This Agreement may be signed in
any number of counterparts, each of which shall be an original, with the same
effect as if the signatures thereto and hereto were upon the same instrument.
This Agreement shall become effective when each party hereto shall have received
counterparts hereof signed by all of the other parties hereto.

                                      -7-

<PAGE>


     IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
duly executed as of the day and year first above written.

                                      HardMetal, Inc.



                                      By: /s/ Steven M. Woghin
                                         ---------------------------------------
                                          Name:  Steven M. Woghin
                                          Title:  Vice President and Secretary
                                          In care of Computer Associates 
                                           International Inc.
                                          One Computer Associates Plaza
                                          Islandia, New York  11788-7000
                                          Attention: Sanjay Kumar
                                                     President and 
                                                     Chief Operating Officer
                                          Fax:  516-342-3300

SHARES                OPTIONS
                                       /s/ Andrew J. Filipowski
2,594,566*            3,998,752       ------------------------------------------
                                      Andrew J. Filipowski **
                                      508 Stone Gate Lane
                                      Winston-Salem, NC  27104
                                      Telephone:  336-774-1964
                                      Facsimile:  336-774-8721


- --------
*    Number of Shares includes 547,994 Shares held by a limited partnership
     (Platinum Ventures) of which Mr. Filipowski is a limited partner and over
     which Mr. Filipowski has voting control (the "LP Shares"). The LP Shares
     will be tendered in the Offer if requested by Buyer, and are subject to the
     proxy granted in this Agreement, but are not subject to the Option unless
     they are withdrawn from the limited partnership.

**   Mr. Filipowski has represented to the Buyer that the Options and Shares
     owned by Mr. Filipowski are (i) deposited in a brokerage account pursuant
     to which they have been pledged to secure margin loans upon standard terms
     and (ii) are subject to a "put/call collar" arrangement with the brokerage
     (or its affiliate) in which such shares are so deposited. Buyer's rights
     under this Agreement are subject to such arrangements so long as they
     remain in effect, it being understood that, to the extent of rights or
     other benefits of ownership retained by Mr. Filipowski in such Options (or
     the Shares issuable upon the exercise thereof) and the other Shares owned
     by him, this Agreement is not subject to such arrangements.


                                      -8-


<PAGE>



SHARES                OPTIONS
                                       /s/ Paul L. Humenansky
34,989                1,896,623       ------------------------------------------
                                      Paul L. Humenansky
                                      630 Forest Avenue
                                      Glen Ellyn, IL  60137
                                      Telephone:  630-790-9035
                                      Facsimile:  630-790-9049

SHARES                OPTIONS
                                       /s/ Michael Cullinane
none                  1,748,750       ------------------------------------------
                                      Michael Cullinane
                                      2233 Edgebrook Drive
                                      Lisle, IL  60532
                                      Telephone:  630-510-9910
                                      Facsimile:  630-510-9927

<PAGE>

                                                            Exhibit (c)(3)



                                 March 24, 1999




PLATINUM TECHNOLOGY International, INC.
1815 South Meyers Road
Oakbrook Terrace, Illinois 60181

Attention:  President

Dear Sir:

         PLATINUM TECHNOLOGY International, INC., a Delaware corporation
("PLATINUM"), and Computer Associates International, Inc., a Delaware
corporation ("Company"), are engaged in discussions with respect to a possible
transaction between PLATINUM and Company (a "Transaction"), and during the
course of such discussions, PLATINUM and Company may each disclose and make
available to the other certain information concerning its business, financial
condition, operations, assets and liabilities (collectively, the "Confidential
Information"). Subject to paragraph 4 below, the term "Confidential Information"
shall include all information concerning PLATINUM and Company (whether prepared
by the disclosing party, its advisors or otherwise and irrespective of the form
of communication, whether written, oral, electronic or other) which is furnished
hereunder to a party or its Representatives now or in the future by or on behalf
of the disclosing party, and shall also include all notes, analyses,
compilations, studies, interpretations or other documents prepared by each party
or its Representatives which contain, reflect or are based upon, in whole or in
part, the information furnished to such party or its Representatives pursuant
hereto. As a condition to being furnished with the Confidential Information,
each of PLATINUM and Company agree as follows:


         1. NON-DISCLOSURE OF CONFIDENTIAL INFORMATION. (a) Each of PLATINUM and
Company shall (i) use the Confidential Information obtained from the other
solely for the purpose of evaluating a possible Transaction involving PLATINUM
and Company and for no other purpose (competitive or otherwise); (ii) not
disclose the Confidential Information to any third party, except for disclosures
to its directors, executive officers, employees and representatives and advisors
(such as independent accountants and attorneys) acting on its behalf
(collectively, its "Representatives") who need to know such information for the
purpose of evaluating a possible Transaction involving PLATINUM and Company;
(iii) inform its Representatives of the confidential nature of the Confidential
Information and direct its Representatives to treat the Confidential Information
confidentially; (iv) take all additional precautions reasonably necessary to
prevent the disclosure of the Confidential Information by its Representatives to
any third party; and (v) be responsible for any breach of this Agreement 


                                       -1-
<PAGE>

by its Representatives.

         (b) If either party is requested or required (by oral questions,
interrogatories, requests for information or documents, subpoena, civil
investigative demand or similar process) to disclose any Confidential
Information, it is agreed that such party will provide the other party with
prompt notice of such request so that such other party may seek an appropriate
protective order and/or waive the notifying party's compliance with the
provisions of this Agreement. If in the absence of a protective order, either
party is nonetheless compelled to disclose Confidential Information, such party
may disclose only that portion of such information that such party is advised by
a written opinion of counsel is legally required without liability hereunder;
provided, however, that such party gives to the other party written notice of
the information to be disclosed as far in advance of its disclosure as is
practicable and, upon such other party's request, uses reasonable efforts (at
the other party's expense) to obtain assurances that confidential treatment will
be accorded to such information.

         2. NON-DISCLOSURE OF NEGOTIATIONS OR AGREEMENTS. Neither PLATINUM nor
Company shall, and each of PLATINUM and Company shall direct its Representatives
not to, disclose to any third party the existence, status or terms of any
discussions, negotiations or agreements between them, without obtaining the
prior consent of the other party, provided that a party may make such disclosure
after the signing of a definitive agreement for a Transaction if, in the
reasonable opinion of outside counsel for such party, such disclosure is
required by law, regulation, exchange rule or Nasdaq National Market
requirement.

         3. OWNERSHIP OF CONFIDENTIAL INFORMATION. All written Confidential
Information delivered by one party hereto to the other party pursuant to this
Agreement shall be and remain the property of the delivering party, and upon the
written request of the delivering party, the receiving party shall (i) promptly
return the Confidential Information delivered to it and shall not retain any
copies or other reproductions or extracts thereof, (ii) destroy or have
destroyed all memoranda, notes, reports and documents and all copies and other
reproductions and extracts thereof prepared by the receiving party or others in
connection with its review of the Confidential Information and (iii) provide a
certificate to the delivering party certifying that the foregoing materials
have, in fact, been destroyed or returned, signed by an authorized offer
supervising such destruction or return.

         4. INFORMATION NOT DEEMED CONFIDENTIAL INFORMATION. The term
"Confidential Information" does not include information which (i) becomes
generally available to the public other than as a result of a disclosure by the
receiving party or its Representatives in violation of this Agreement; (ii) was
available on a non-confidential basis prior to disclosure to the receiving party
pursuant to this Agreement; or (iii) becomes available to the receiving party on
a non-confidential basis from a source other than the delivering party or its
Representatives, provided that such source is not known by the receiving party
to be bound by a confidentiality agreement with such delivering party or its
Representatives.

         5. NO WARRANTY. Neither PLATINUM nor Company makes any representation
or warranty as to the accuracy and completeness of any Confidential Information
provided by it, 


                                       -2-
<PAGE>

and no liability shall result to the delivering party from its use, except as
set forth in a definitive agreement for a Transaction. Only the representations
and warranties that are made in a definitive agreement for a Transaction, when,
as, and if it is executed, and subject to such limitations and restrictions as
may be specified therein, shall have any legal effect. It is understood that the
Confidential Information is not being furnished for use in an offer or sale of
securities of either party and is not designed to satisfy the requirements of
federal or state securities law in connection with any offer or sale of such
securities.

         6. NO AGREEMENT. Unless a definitive agreement regarding a Transaction
between PLATINUM and Company has been executed and delivered, neither Company
nor PLATINUM will be under any legal obligation of any kind whatsoever with
respect to such a Transaction by virtue of this Agreement except for the matters
specifically agreed to herein. Each party further acknowledges and agrees that
each party reserves the right, in its sole discretion, to reject any and all
proposals made by the other party or any of its Representatives with regard to a
Transaction between PLATINUM and Company, and to terminate discussions and
negotiations with the other party at any time.

         7. DUE DILIGENCE CONTACTS. It is understood that each party will
arrange for appropriate contacts for due diligence purposes. Unless otherwise
agreed by either party, all (i) communications regarding a possible Transaction,
(ii) requests for additional information, (iii) requests for facility tours or
management meetings, or (iv) discussions or questions regarding procedures, will
be submitted or directed solely to the following designated persons for the
other party:

                  for PLATINUM:     Larry Freedman
                                    Michael Cullinane; and

                  for Company:      Charles McWade
                                    Steven M. Woghin

         8. NON-PUBLIC INFORMATION; TRADING IN SECURITIES. Each of PLATINUM and
Company has outstanding publicly-held securities and acknowledges that (i) the
Confidential Information may contain material non-public information, and (ii)
the negotiations and status of negotiations between the parties may constitute
material non-public information. Each of the parties acknowledges that it is (i)
aware, and has advised or will advise its Representatives, that the United
States securities laws prohibit any person in possession of material non-public
information about a company from purchasing or selling securities of such
company and from communicating such information to any other person under
circumstances in which it is reasonably foreseeable that such person may
purchase or sell such securities and (ii) familiar with the Securities Exchange
Act of 1934, as amended (the "Exchange Act"), and the rules and regulations
thereunder, and each of PLATINUM and Company agrees that it will neither use nor
permit any of its Representatives to use any Confidential Information in
violation of such Act or rules or regulations, including, without limitation,
Rules 10b-5 and 14e-3. Each of PLATINUM and Company agrees to take all
reasonable precautions to prevent any trading in securities of PLATINUM and
Company by their respective officers, directors, employees 


                                      -3-
<PAGE>

and agents having knowledge of any proposed transaction between the parties
until the proposed transaction has been sufficiently publicly disclosed.

         9. PURPOSE AND USE OF CONFIDENTIAL INFORMATION. PLATINUM and Company
understand and agree that the Confidential Information shall be used solely for
the purpose of evaluating a potential business transaction and not to affect, in
any way, either party's relative competitive position to the other party, and
that only information reasonably necessary to evaluate a proposed transaction
shall be disclosed or exchanged.

         10. NO WAIVER. No failure or delay by either party in exercising any
right, power or privilege hereunder shall operate as a waiver thereof, nor shall
any single or partial exercise thereof preclude any other or further exercise
thereof, or the exercise of any right, power or privilege hereunder. Any waiver
of a breach hereof shall be in writing and shall not operate or be construed as
a waiver of any other or subsequent breach.

         11. REMEDIES. It is understood and agreed that either party will suffer
irreparable harm if this agreement is breached by the other party or its
Representatives, including without limitation a breach of paragraph 2 or 7 by
the other party or its Representatives which would result in significant and
material damages to the non-breaching party. It is understood and agreed that
money damages would not be a sufficient remedy for any breach of this Agreement
by either party or its Representatives and that the non-breaching party shall be
entitled to equitable relief, including specific performance and injunction, as
a remedy for any such breach. Such remedies shall not be deemed to be the
exclusive remedies for a breach of this Agreement by either party or its
Representatives, but shall be in addition to all other remedies available at law
or in equity to the non-breaching party.

         12. GOVERNING LAW. This Agreement shall be governed by and construed in
accordance with the internal law of, and not the choice of law provisions or law
of conflicts of, the State of Delaware.

         13. COUNTERPARTS. This Agreement may be executed in one or more
counterparts, each of which shall be deemed an original, but all such
counterparts together shall constitute but one and the same Agreement.


                   [BALANCE OF PAGE INTENTIONALLY LEFT BLANK]


                                       -4-
<PAGE>

         Please confirm your agreement with the foregoing by signing and
returning one copy of this letter to the undersigned, whereupon this letter
agreement shall become a binding agreement between PLATINUM and Company.

                                         COMPUTER ASSOCIATES INTERNATIONAL, INC.


                                         By: /s/ Charles McWade
                                             --------------------
                                         Name: Charles McWade
                                         Title: Senior Vice President


Accepted and agreed:

PLATINUM TECHNOLOGY INTERNATIONAL, INC.


By: /s/ Larry S. Freedman
    -----------------------------------
Name: Larry S. Freedman
     ----------------------------------
Title: Senior Vice President and
         General Counsel
      ---------------------------------
      
Dated: March 24, 1999




                                       -5-






<PAGE>

                                                                Exhibit 99(c)(4)


                  CONSULTING AND NON-COMPETE AGREEMENT, dated as of March 29,
                  1999 (the "AGREEMENT"), by and between PLATINUM TECHNOLOGY
                  International, INC., a Delaware corporation (the "COMPANY"),
                  and Andrew J. Filipowski (the "CONSULTANT").
                  ------------------------------------------------------------

                  The Company is intending to enter into a Merger Agreement with
Computer Associates International, Inc. (the "MERGER AGREEMENT"), pursuant to
which the Company will become a subsidiary of Computer Associates International,
Inc. The Consultant is a senior executive of the Company, has unique knowledge
of the Company's business and has occupied a position of trust and confidence.
The Company and the Consultant desire that, effective upon the Merger (as
defined in the Merger Agreement), the Consultant will continue as a consultant
to the Company and will agree to refrain from competing with the Company all as
set forth in this Agreement.

                  In consideration of the mutual agreements, the Consultant and
the Company agree as follows:

                  1. SERVICES. For the Consulting Period (as defined in Section
2), the Consultant shall provide from time to time and as requested by the
Company the consulting services set forth in Schedule A (the "SERVICES"). The
Consultant shall report to the President of Computer Associates International,
Inc. The Consultant shall devote such time and energy to the business of the
Company as reasonably required to perform the Services; the parties agree that
the performance of the Services is not intended to require full time effort (and
the Consultant is free to take other full time employment not inconsistent with
the terms of this Agreement). The Company shall not require the Consultant to
travel a greater amount than in connection with his current employment.

                  2. TERM. The Consultant and the Company agree that the
consulting period (the "CONSULTING PERIOD") begins on the Effective Date (as
defined in Section 7) and ends on the second anniversary of the Effective Date.
The Consultant acknowledges that the Consulting Period may be terminated at any
time, with or without cause or for any or no reason, at the option either of the
Company or the Consultant, on 30 days written notice, as provided in Section 4.

                  3. CONSULTING FEE. Commencing on the Effective Date, the
Company shall pay the Consultant a consulting fee at the annual rate of
$1,000,000, payable quarterly in arrears. The Company shall reimburse Consultant
for all reasonable costs and expenses incurred in connection with Consultant's
performance of the Services.

                  4. TERMINATION. (a) TERMINATION WITHOUT CAUSE. If the Company
terminates the Consulting Period without Cause prior to the second anniversary
of the Effective Date, the Consultant shall be entitled to continued payment of
all consulting fees.

                  (b) TERMINATION FOR CAUSE. If (i) the Company terminates the
Consulting Period at any time for Cause, or (ii) the Consultant terminates the
Consulting Period at any time, the Consultant shall be entitled to receive the
consulting fees paid through the date of 


<PAGE>

termination. "CAUSE" shall mean (A) the Consultant's material breach of any
material term of this Agreement, including, but not limited to, the covenants
set forth in Section 5 hereof, subject to the Consultant's right to cure any
breach that is curable within a reasonable period following notice by the
Company, (B) the Consultant's conviction of a felony, or (C) any willful
misconduct by the Consultant resulting in substantial loss to the Company,
substantial damage to the Company's reputation or judicially determined theft or
misappropriation from the Company.

                  (c) TERMINATION UPON DEATH OR DISABILITY. If the Consultant
dies or becomes Disabled, in which event the Consulting Period shall terminate,
the Consultant (or, in the case of death, his estate), shall be entitled to
continued payment of all consulting fees as death or disability benefits.
"DISABLED" shall mean the Consultant's adjudication as mentally incompetent, or
the occurrence of a mental or physical disability for 120 or more days within
any calendar year. Any question as to the existence of his disability as to
which the Consultant and the Company cannot agree shall be determined in writing
by a qualified independent physician mutually acceptable to the Consultant and
the Company. If the Consultant and the Company cannot agree on a qualified
independent physician, each shall appoint such a physician and those two
physicians shall select a third who shall make such determination in writing.
The determination of disability made in writing to the Consultant and the
Company shall be final and conclusive for all purposes.

                  (d) GENERAL. Upon the termination of the Consulting Period,
for any reason, (i) the Company shall have no further obligations to the
Consultant hereunder, other than as specifically set forth in this Agreement and
(ii) the Consultant shall continue to be bound (subject to the time periods and
limitations set forth herein) by the terms of this Agreement other than Section
1. Confidential Information shall remain confidential under Section 5(c) for so
long as such information is "CONFIDENTIAL INFORMATION".

                  5. NON-COMPETITION; CONFIDENTIALITY; PAYMENTS. (a) In
consideration for, and as a condition to, the Company's payment of the
non-compete payment and entering into this Agreement, and in connection with the
merger described herein, until the eighth anniversary of the Effective Date, the
Consultant will not directly or indirectly, on Consultant's own behalf or in the
service of or on behalf of any other individual or entity, either as a
proprietor, employee, agent, independent contractor, consultant, director,
officer, partner or stockholder (other than a stockholder of a corporation
listed on a national securities exchange or whose stock is regularly traded in
the over-the-counter market, provided that the Consultant at no time owns,
directly or indirectly, in excess of 2% of the outstanding stock of any class of
any such corporation):

                           (i) participate or engage in any activities or
         business developing, manufacturing, marketing or distributing any
         products or services offered by the Company on the date of this
         Agreement, or any products or services offered by the Company in the
         future and in which the Consultant actively participated, recognizing
         that the Company offers products and services globally ("COMPETITIVE
         ACTIVITIES"), including, without limitation, (A) selling goods or
         rendering services of the type (or similar to the type) sold or
         rendered by the Company, whether by means of electronic, traditional or
         other form of commerce; (B) soliciting any person or entity that is a
         current customer, that has been a customer within the past three years
         or that is or was a prospective customer prior to or during the
         Consulting Period, in each case, of the Company or an 


                                      -2-
<PAGE>

         affiliate of the Company (provided that it shall not be deemed a
         breach of this Agreement if the Consultant solicits such customers
         for goods or services unrelated to the Competitive Activities), (C)
         assisting any person in any way to do, or attempt to do, anything
         prohibited by clauses (A) or (B) above and (D) be employed by any
         person or entity that has received services of the type described
         above from the Consultant or with which the Consultant otherwise had
         material contact while employed by the Company or which received
         services of the type describe above from any office or employee of
         the Company over which Consultant had management responsibility, in
         either case to provide or supervise, directly or indirectly, the
         services comprising a Competitive Activity; or

                           (ii) perform any action, activity or course of
         conduct which is detrimental in any material respect to the businesses
         or business reputation of the Company (or any of its affiliates),
         including without limitation (A) soliciting, recruiting or hiring any
         employees of the Company (or any of its affiliates) or persons who have
         worked for the Company (or any of its affiliates) at any time since
         January 1, 1998; provided that the Consultant may hire any employee of
         the Company (I) that has been terminated by the Company, (II) in
         connection with a business that is not a Competitive Activity
         (including any VC Business that is not a Competitive Activity), but
         Consultant may not solicit or recruit for such purposes, or (III) to
         work in a VC Business (as hereinafter defined), but not to work in or
         for any company in which any VC Business invests or otherwise acquires
         an interest, and (B) soliciting or encouraging any employee of the
         Company (or any of its affiliates) to leave the employment of the
         Company.

                  (b) Notwithstanding anything to the contrary herein,
Consultant may remain a director at those companies for which Consultant is a
director as of the Effective Date and may engage in any activities or
businesses:

                  (i) involving venture capital activities (a "VC Business"),
including, without limitation, activities undertaken through Platinum Venture
Partners or any similar entities as may be formed in the future, holding
directorships, and through such partnerships exercising veto power over certain
decisions in companies in which venture capital investments have been made;
provided that the Consultant shall not without permission in any such venture
invest in any company whose primary business is a Competitive Activity; or

                  (ii) for which the Company has given permission in writing,
which shall not be unreasonably withheld (or delayed) after the fifth
anniversary of the Effective Date, provided Consultant's engaging in such
activities or business would not have a material adverse impact on any of the
Company's lines of business; or

                  (iii) which Computer Associates International, Inc. shall have
confirmed (which confirmation shall not be unreasonably withheld or delayed) in
writing to Consultant are not inconsistent with the prohibitions of Sections
5(a) and 5(b) hereof.

                  (c) The Consultant shall not, without the written consent of
the Company, disclose to any other person or use, whether directly or
indirectly, any Confidential Information relating to or used by the Company or
any of its affiliates, whether in written, oral or other form,


                                      -3-
<PAGE>

except in connection with the performance of his duties hereunder. "CONFIDENTIAL
INFORMATION" shall mean information about the Company or any of its affiliates,
and their clients and customers that is not disclosed by the Company or any of
its affiliates for financial reporting purposes and that was learned by the
Consultant in the course of employment by the Company or any of its affiliates
or in the course of performing the services under this Agreement, including
(without limitation) any proprietary knowledge, product and service designs,
trade secrets, manuals, technical information and plans, contracts, systems,
procedures, databases, electronic files, disks and printouts, correspondence,
internal reports, personnel files, information about employees of the Company
and its affiliates relating to their education, experience, skills, abilities,
compensation and benefits, and inter-personal relationships with suppliers to
and customers of the Company and its affiliates, sales and advertising material,
business plans, marketing plans, financial data (including without limitation
the revenues, costs or profits associated with services), customer and industry
lists, customer information, customer lists coupled with product or service
pricing, customer contacts, supplier contacts and other contact information,
pricing policies, supplies, agents, risk analyses, engineering information and
computer reports, computer software, computer systems, computer formats,
computer screen designs and computer input and output specifications, inclusive
of any pertinent documentation, techniques, processes, technical information and
know-how. The Consultant acknowledges that such Confidential Information is
specialized, unique in nature and of great value to the Company and its
affiliates, and that such information gives the Company and its affiliates a
competitive advantage. The Consultant's obligations under this Section 5(b)
shall survive the termination of the Consulting Period and of this Agreement and
shall be fully enforceable thereafter in accordance with the terms of this
Agreement.

                  (d) (i) Confidential Information does not include information
which (A) is or becomes part of the public domain other than as a result of the
Consultant's disclosure, or (B) becomes available to the Consultant on a
nonconfidential basis from a source other than the Company, provided that source
is not bound with respect to that information by a confidentiality agreement
with the Company or otherwise prohibited from transmitting that information by a
contractual, legal or other obligation.

                  (ii) If the Consultant is requested or (in the opinion of his
counsel) required by law or judicial order to disclose any Confidential
Information, the Consultant shall provide the Company with prompt notice of any
such request or requirement so that the Company may seek an appropriate
protective order or waiver of the Consultant's compliance with the provisions of
this Section 5(c). The Consultant will not oppose any reasonable action by, and
will cooperate with, the Company to obtain an appropriate protective order or
other reliable assurance that confidential treatment will be accorded the
Confidential Information. If, failing the entry of a protective order or the
receipt of a waiver hereunder, the Consultant is, in the opinion of his counsel,
compelled by law to disclose a portion of the Confidential Information, the
Consultant may disclose to the relevant tribunal without liability hereunder
that portion of the Confidential Information which counsel advises the
Consultant he is legally required to disclose, and each of the parties hereto
agrees to exercise such party's best efforts to obtain assurance that
confidential treatment will be accorded such Confidential Information.

                  (e) If an award by a court or arbitration panel declares that
any term or provision of this Section 5 is excessive in duration or scope or is
unreasonable or unenforceable, 


                                      -4-
<PAGE>

the parties agree that the court or arbitration panel making such determination
shall have the power to reduce the scope, duration or area of the term or
provision, to delete specific words or phrases, or to replace any invalid or
unenforceable term or provision with a term or provision that is valid and
enforceable and that comes closest to expressing the intention of the invalid or
unenforceable term or provision, and this Agreement shall be enforceable as so
modified.

                  (f) In the event of a breach or threatened breach by the
Consultant of the provisions of this Section 5, the Consultant acknowledges that
the Company will suffer irreparable injury and may not have an adequate remedy
at law and therefore may be entitled to a temporary restraining order or a
preliminary or permanent injunction restraining the Consultant from such breach
without the requirement of posting security or proving actual damages as well as
an equitable accounting of all profits or benefits arising out of such
violation. In addition, in the event of a breach (that is not immaterial) at any
time by the Consultant of the provisions of this Section 5, the Consultant
agrees as liquidated damages hereunder to repay the full amount of the
non-compete payments made pursuant to Section 5(g). Nothing contained in this
Section 5 or elsewhere in this Agreement shall be construed as prohibiting the
Company from pursuing any other remedies available at law or equity for such
breach or threatened breach by the Consultant.

                  (g) In consideration of the Consultant's covenants under this
Section 5, the Company shall pay the Consultant a non-compete payment at the
annual rate of $3,000,000 in the first year, $3,000,000 in the second year,
$4,000,000 in the third year, $4,000,000 in the fourth year, $3,000,000 in the
fifth year, $3,000,000 in the sixth year, $2,000,000 in the seventh year and
$1,000,000 in the eighth year, quarterly in arrears, commencing on the Effective
Date.

                  (h) By executing this Agreement, Consultant assigns and
transfers to the Company all his right, title, and interest in and to all
intellectual property created, developed, conceived, or reduced to practice
while employed as a Consultant by the Company or its predecessor(s) arising in
connection with the Services. While he is employed by the Company and when he
ceases to be employed by the Company, Consultant shall fully and promptly
disclose in writing to the Company, and hold in trust for the sole right and
benefit of the Company, all ideas, plans, designs, methods, techniques,
discoveries, inventions, developments, improvements, trade secrets, computer
programs and software, and other proprietary data, records, and information that
Consultant solely or jointly develops or reduces to practice while employed by,
and arising in connection with the Services to, the Company (collectively
"Intellectual Property"), whether or not patentable or capable of copyright or
trademark registration, and whether or not created, conceived, developed, or
reduced to practice at the request of the Company or during normal working
hours. While employed by the Company and at all times thereafter, Consultant
shall do all things, and execute all documents (including applications for
patents, copyrights, and trademarks, and for renewals extensions, and divisions
thereof), that are requested and reasonably required by the Company to create,
enforce, or evidence the Company's rights to any Intellectual Property.

                  6. COOPERATION. (a) The Consultant agrees to cooperate with
the Company at all times (including following termination of the Consulting
Period for any reason) by making himself reasonably available to testify on
behalf of the Company or its affiliates, in any action, suit or proceeding,
whether civil, criminal, administrative, or investigative and to assist the
Company or any of its affiliates in any such action, suit, or proceeding by
providing information


                                      -5-
<PAGE>

and meeting and consulting with the Company or representatives or counsel to the
Company or its affiliates, as reasonably requested by such representatives or
counsel. The Consultant shall be reimbursed by the Company for any expenses
(including, but not limited to, legal fees) reasonably incurred by the
Consultant in connection with his compliance with the foregoing covenant.

                  (b) Consultant shall fully cooperate with the Company and
Computer Associates International, Inc. in connection with filings under the
Hart-Scott-Rodino Antitrust Improvements Act of 1978 and in connection with
resolving any investigation or other inquiry of any governmental entity under
the antitrust laws.

                  (c) In the event the Company fails to observe the requirements
of Section 5.1 of the Merger Agreement, whether or not enforceable or in force
under such agreement, and the aggregate loss or damage is greater than
$1,500,000, then the Consultant shall be liable for 49% of each dollar of
liability under this Section 6 (including, without limitation, forfeitures under
Section 6(d)) for such failure in excess of $1,500,000. The maximum amount of
liability under this Section for the Consultant shall be an amount equal to the
sum of the total payments under this Agreement and the value of the 675,000
options issued to the Consultant in 1999.

                  (d) The Consultant agrees that, in the event the Department of
Justice or other governmental entity causes a delay in the closing of the
Merger, with his approval, the Company has amended the terms of the grant of
675,000 options in 1999 to include the following terms:

                  o     none of the options are exercisable until simultaneously
                        with the closing of the Offer described in the Merger
                        Agreement

                  o     if all antitrust issues with the Department of Justice
                        or other governmental entity to permit the completion of
                        the Merger shall have been resolved within the four
                        months following the substantial compliance by Computer
                        Associates International, Inc. and the Company with
                        respect to the Hart-Scott-Rodino Act of 1978 as provided
                        in Section 7.1(e)(i), all options shall be exercisable

                  o     if all antitrust issues with the Department of Justice
                        or other governmental entity to permit the completion of
                        the Merger shall have been resolved within the period
                        described in Section 7.1(e)(iii) of the Merger
                        Agreement, 50% of the options shall be exercisable and
                        the balance shall be forfeited

                  o     if all antitrust issues with the Department of Justice
                        or other governmental entity to permit the completion of
                        the Merger shall have been resolved within the period
                        described in Section 7.1(e)(iv) of the Merger Agreement,
                        25% of the options shall be exercisable and the balance
                        shall be forfeited.

                  7. CONDITIONS TO EFFECTIVENESS. The Effective Date of this
Agreement (the "EFFECTIVE DATE") shall be the date that the merger of the
Company and a wholly-owned subsidiary of Computer Associates International,
Inc., becomes effective pursuant to the Merger Agreement. In the event the
Merger Agreement terminates, this Agreement shall terminate.


                                      -6-
<PAGE>

                  8. DUTIES ON TERMINATION. At the Company's request at any time
or upon termination of the Consulting Period for any reason, the Consultant
agrees to deliver promptly to the Company all notebooks, documents, memoranda,
reports, files, samples, books, correspondence, lists, computer tapes or disks,
or other written or graphic records, and the like (and all copies thereof), from
the Company's business, which are or have been in his possession or under his
control.

                  9. SEVERABILITY. In the event that any one or more of the
provisions of this Agreement shall be or become invalid, illegal or
unenforceable in any respect, the validity, legality and enforceability of the
remaining provisions of this Agreement shall not be affected thereby.

                  10. NOTICES. All notices and other communications under this
Agreement shall be in writing and shall be given by first-class mail, certified
or registered with return receipt requested, by reputable overnight carrier or
hand delivery acknowledged in writing by the recipient personally, and shall be
deemed to have been duly given three days after mailing or immediately upon duly
acknowledged hand delivery to the respective persons named below:

         If to the Company:     PLATINUM TECHNOLOGY International, INC.
                                1815 South Meyers Road
                                Oakbrook Terrace, Illinois  60181

                                Attention: Andrew J. Filipowski

                                with a copy to:

                                Computer Associates International, Inc.
                                One Computer Associates Plaza
                                Islandia, New York  11788-7000

                                Attention: Sanjay Kumar
                                           President and Chief Operating Officer

                                If to the Consultant:

                                Andrew J. Filipowski
                                1815 South Meyers Road
                                Oakbrook Terrace, IL 60181

Either party may change such party's address for notices by notice duly given
pursuant hereto.

                  11. GOVERNING LAW. This agreement and the legal relations thus
created between the parties hereto shall be governed by and construed under and
in accordance with the internal laws of the State of New York without reference
to the principles of conflicts of laws.

                  12. ENTIRE AGREEMENT. Except as specifically set forth herein,
this Agreement represents the entire agreement between the parties hereto with
respect to the subject matter 


                                      -7-
<PAGE>

hereof, and supersedes all prior agreements, representations and understandings.
The Consultant acknowledges and agrees that neither the Company nor anyone
acting on its behalf has made, and is not making, and in executing this
Agreement, the Consultant has not relied upon, any representations, promises or
inducements except to the extent the same is expressly set forth in this
Agreement. No amounts payable under this Agreement shall be considered as
compensation under the Consultant's former employment agreement.

                  13. COUNTERPARTS. This Agreement may be executed in two or 
more counterparts, each of which shall be deemed an original, but all of which
together shall constitute one and the same instrument.

                  14. ASSIGNMENT OF RIGHTS BY THE CONSULTANT. The Consultant may
not assign any rights hereunder without the prior written consent of the
Company. Any such assignment in the absence of such written consent shall be
void. The Company may assign this Agreement to any successor to the Company or a
substantial part of the Company's business or assets provided that upon such
assignment references to the "Company" shall mean Company as it existed prior to
such assignment and further provided that any such assignment shall not expand
Consultant's obligations hereunder.

                  15. AMENDMENTS; WAIVERS. (a) This Agreement may not be
modified, amended, altered or supplemented except upon the written agreement
executed by the parties hereto.

                  (b) No failure or delay by any party in exercising any right,
power or privilege hereunder shall operate as a waiver thereof nor shall any
single or partial exercise thereof preclude any other or further exercise
thereof or the exercise of any other right, power or privilege. The rights and
remedies herein provided shall be cumulative and not exclusive of any rights or
remedies provided by law.

                  16. MUTUAL RELEASE. Upon the Effective Date, the Consultant 
is hereby released from and the Company waives, any and all liability, 
claims, damages, causes of action, judgments (including any of the foregoing 
with respect to costs, penalties, losses and expenses) which the Company has 
or may have against the Consultant solely in connection with expenses 
incurred, or non-monetary Company resources used, by the Consultant in the 
performance of his ordinary course duties as an officer of the Company, 
provided that Consultant is not released from any liability pursuant to this 
Agreement. Upon the Effective Date, the Company is hereby released from, and 
the Consultant waives (including any of the foregoing with respect to costs, 
penalties, any and all liability, claims, damages, causes of action, 
judgments, losses and expenses which the Consultant may have against the 
Company solely in connection with expenses the Consultant incurred, or 
non-monetary Company resources used, in the performance of his ordinary 
course duties as an officer of the Company, provided that the Company is not 
released from any liability pursuant to this Agreement, any option agreements 
or any other written agreement entered into by the Consultant in connection 
with the Merger.

                                      -8-
<PAGE>

                  The Company has caused this Agreement to be executed and
delivered by its duly authorized officer and the Consultant has executed and
delivered this Agreement as of the date set forth above.


                                          /s/ Andrew J. Filipowski
                                        ------------------------------
                                             ANDREW J. FILIPOWSKI
                                                  CONSULTANT



                                        PLATINUM TECHNOLOGY INTERNATIONAL, INC.


                                        By: /s/ Paul L. Humenansky
                                           ---------------------------
                                           Name: Paul L. Humenansky
                                           Title: Executive Vice President


                                      -9-
<PAGE>

                                   SCHEDULE A


                       DESCRIPTION OF CONSULTING SERVICES
                       ----------------------------------



Transition Services
Integration Services
Customer Relations and Retention
Employee Relations and Retention
Strategic Planning


<PAGE>

                                                                Exhibit 99(c)(5)


                  CONSULTING AND NON-COMPETE AGREEMENT, dated as of March 29,
                  1999 (the "AGREEMENT"), by and between PLATINUM TECHNOLOGY
                  International, INC., a Delaware corporation (the "COMPANY"),
                  and Michael P. Cullinane (the "CONSULTANT").
                  ------------------------------------------------------------


                  The Company is intending to enter into a Merger Agreement with
Computer Associates International, Inc. (the "MERGER AGREEMENT"), pursuant to
which the Company will become a subsidiary of Computer Associates International,
Inc. The Consultant is a senior executive of the Company, has unique knowledge
of the Company's business and has occupied a position of trust and confidence.
The Company and the Consultant desire that, effective upon the Merger (as
defined in the Merger Agreement), the Consultant will continue as a consultant
to the Company and will agree to refrain from competing with the Company all as
set forth in this Agreement.

                  In consideration of the mutual agreements, the Consultant and
the Company agree as follows:

                  1. SERVICES. (a) The Consultant agrees, at the request of the
Company, that for a period of up to six months from the Effective Date (but in
no event later than September 30, 1999), to remain as an employee to provide
transition services in a capacity substantially similar to Consultant's current
employment and with continuation of compensation on the same basis as current
compensation.

                  (b) For the Consulting Period (as defined in Section 2), the
Consultant shall provide from time to time and as requested by the Company the
consulting services set forth in Schedule A (the "SERVICES"). The Consultant
shall report to the President of Computer Associates International, Inc. The
Consultant shall devote such time and energy to the business of the Company as
reasonably required to perform the Services; the parties agree that the
performance of the Services is not intended to require full time effort (and the
Consultant is free to take other full time employment not inconsistent with the
terms of this Agreement). The Company shall not require the Consultant to travel
a greater amount than in connection with his current employment.

                  2. TERM. The Consultant and the Company agree that the
consulting period (the "CONSULTING PERIOD") begins on the later of the Effective
Date (as defined in Section 7) and the date the transition employment services
under Section 1(a) end and ends on the second anniversary of the Effective Date.
The Consultant acknowledges that the Consulting Period may be terminated at any
time, with or without cause or for any or no reason, at the option either of the
Company or the Consultant, on 30 days written notice, as provided in Section 4.

                  3. CONSULTING FEE. Commencing on the Effective Date, the 
Company shall pay the Consultant a consulting fee at the annual rate of
$500,000, payable quarterly in arrears. The Company shall reimburse Consultant
for all reasonable costs and expenses incurred in connection with Consultant's
performance of the Services.

<PAGE>

                  4. TERMINATION. (a) TERMINATION WITHOUT CAUSE. If the Company
terminates the Consulting Period without Cause prior to the second anniversary
of the Effective Date, the Consultant shall be entitled to continued payment of
all consulting fees.

                  (b) TERMINATION FOR CAUSE. If (i) the Company terminates the
Consulting Period at any time for Cause, or (ii) the Consultant terminates the
Consulting Period at any time, the Consultant shall be entitled to receive the
consulting fees paid through the date of termination. "CAUSE" shall mean (A) the
Consultant's material breach of any material term of this Agreement, including,
but not limited to, the covenants set forth in Section 5 hereof, subject to the
Consultant's right to cure any breach that is curable within a reasonable period
following notice by the Company, (B) the Consultant's conviction of a felony, or
(C) any willful misconduct by the Consultant resulting in substantial loss to
the Company, substantial damage to the Company's reputation or judicially
determined theft or misappropriation from the Company.

                  (c) TERMINATION UPON DEATH OR DISABILITY. If the Consultant
dies or becomes Disabled, in which event the Consulting Period shall terminate,
the Consultant (or, in the case of death, his estate), shall be entitled to
continued payment of all consulting fees as death or disability benefits.
"DISABLED" shall mean the Consultant's adjudication as mentally incompetent, or
the occurrence of a mental or physical disability for 120 or more days within
any calendar year. Any question as to the existence of his disability as to
which the Consultant and the Company cannot agree shall be determined in writing
by a qualified independent physician mutually acceptable to the Consultant and
the Company. If the Consultant and the Company cannot agree on a qualified
independent physician, each shall appoint such a physician and those two
physicians shall select a third who shall make such determination in writing.
The determination of disability made in writing to the Consultant and the
Company shall be final and conclusive for all purposes.

                  (d) GENERAL. Upon the termination of the Consulting Period,
for any reason, (i) the Company shall have no further obligations to the
Consultant hereunder, other than as specifically set forth in this Agreement and
(ii) the Consultant shall continue to be bound (subject to the time periods and
limitations set forth herein) by the terms of this Agreement other than Section
1. Confidential Information shall remain confidential under Section 5(c) for so
long as such information is "CONFIDENTIAL INFORMATION".

                  5. NON-COMPETITION; CONFIDENTIALITY; PAYMENTS. (a) In
consideration for, and as a condition to, the Company's payment of the
non-compete payment and entering into this Agreement, and in connection with the
merger described herein, until the fifth anniversary of the later of the
Effective Date and the date the transition employment services under Section
1(a) end, the Consultant will not directly or indirectly, on Consultant's own
behalf or in the service of or on behalf of any other individual or entity,
either as a proprietor, employee, agent, independent contractor, consultant,
director, officer, partner or stockholder (other than a stockholder of a
corporation listed on a national securities exchange or whose stock is regularly
traded in the over-the-counter market, provided that the Consultant at no time
owns, directly or indirectly, in excess of 2% of the outstanding stock of any
class of any such corporation):

                           (i) participate or engage in any activities or
         business developing, manufacturing, marketing or distributing any
         products or services offered by the 


                                      -2-
<PAGE>

         Company on the date of this Agreement, or any products or services
         offered by the Company in the future and in which the Consultant
         actively participated, recognizing that the Company offers products
         and services globally ("COMPETITIVE ACTIVITIES"), including, without
         limitation, (A) selling goods or rendering services of the type (or
         similar to the type) sold or rendered by the Company, whether by
         means of electronic, traditional or other form of commerce; (B)
         soliciting any person or entity that is a current customer, that has
         been a customer within the past three years or that is or was a
         prospective customer prior to or during the Consulting Period, in
         each case, of the Company or an affiliate of the Company (provided
         that it shall not be deemed a breach of this Agreement if the
         Consultant solicits such customers for goods or services unrelated
         to the Competitive Activities), (C) assisting any person in any way
         to do, or attempt to do, anything prohibited by clauses (A) or (B)
         above and (D) be employed by any person or entity that has received
         services of the type described above from the Consultant or with
         which the Consultant otherwise had material contact while employed
         by the Company or which received services of the type describe above
         from any office or employee of the Company over which Consultant had
         management responsibility, in either case to provide or supervise,
         directly or indirectly, the services comprising a Competitive
         Activity; or

                           (ii) perform any action, activity or course of
         conduct which is detrimental in any material respect to the businesses
         or business reputation of the Company (or any of its affiliates),
         including without limitation (A) soliciting, recruiting or hiring any
         employees of the Company (or any of its affiliates) or persons who have
         worked for the Company (or any of its affiliates) at any time since
         January 1, 1998; provided that the Consultant may hire any employee of
         the Company (I) that has been terminated by the Company, (II) in
         connection with a business that is not a Competitive Activity
         (including any VC Business that is not a Competitive Activity), but
         Consultant may not solicit or recruit for such purposes, or (III) to
         work in a VC Business (as hereinafter defined), but not to work in or
         for any company in which any VC Business invests or otherwise acquires
         an interest, and (B) soliciting or encouraging any employee of the
         Company (or any of its affiliates) to leave the employment of the
         Company.

                  (b) Notwithstanding anything to the contrary herein, 
Consultant may remain a director at those companies for which Consultant is a
director as of the Effective Date and may engage in any activities or
businesses:

                  (i) involving venture capital activities (a "VC Business"),
including, without limitation, activities undertaken through Platinum Venture
Partners or any similar entities as may be formed in the future, holding
directorships, and through such partnerships exercising veto power over certain
decisions in companies which venture capital investments have been made;
provided that the Consultant shall not without permission in any such venture
invest in any company whose primary business is a Competitive Activity; or

                  (ii) for which the Company has given permission in writing,
which shall not be unreasonably withheld (or delayed) after the third
anniversary of the Effective Date, provided Consultant's engaging in such
activities or business would not have a material adverse impact on any of the
Company's lines of business; or


                                      -3-
<PAGE>

                  (iii) which Computer Associates International, Inc. shall have
confirmed (which confirmation shall not be unreasonably withheld or delayed) in
writing to Consultant are not inconsistent with the prohibitions of Sections
5(a) and 5(b) hereof.

                  (c) The Consultant shall not, without the written consent of
the Company, disclose to any other person or use, whether directly or
indirectly, any Confidential Information relating to or used by the Company or
any of its affiliates, whether in written, oral or other form, except in
connection with the performance of his duties hereunder. "CONFIDENTIAL
INFORMATION" shall mean information about the Company or any of its affiliates,
and their clients and customers that is not disclosed by the Company or any of
its affiliates for financial reporting purposes and that was learned by the
Consultant in the course of employment by the Company or any of its affiliates
or in the course of performing the services under this Agreement, including
(without limitation) any proprietary knowledge, product and service designs,
trade secrets, manuals, technical information and plans, contracts, systems,
procedures, databases, electronic files, disks and printouts, correspondence,
internal reports, personnel files, information about employees of the Company
and its affiliates relating to their education, experience, skills, abilities,
compensation and benefits, and inter-personal relationships with suppliers to
and customers of the Company and its affiliates, sales and advertising material,
business plans, marketing plans, financial data (including without limitation
the revenues, costs or profits associated with services), customer and industry
lists, customer information, customer lists coupled with product or service
pricing, customer contacts, supplier contacts and other contact information,
pricing policies, supplies, agents, risk analyses, engineering information and
computer reports, computer software, computer systems, computer formats,
computer screen designs and computer input and output specifications, inclusive
of any pertinent documentation, techniques, processes, technical information and
know-how. The Consultant acknowledges that such Confidential Information is
specialized, unique in nature and of great value to the Company and its
affiliates, and that such information gives the Company and its affiliates a
competitive advantage. The Consultant's obligations under this Section 5(b)
shall survive the termination of the Consulting Period and of this Agreement and
shall be fully enforceable thereafter in accordance with the terms of this
Agreement.

                  (d) (i) Confidential Information does not include information
which (A) is or becomes part of the public domain other than as a result of the
Consultant's disclosure, or (B) becomes available to the Consultant on a
nonconfidential basis from a source other than the Company, provided that source
is not bound with respect to that information by a confidentiality agreement
with the Company or otherwise prohibited from transmitting that information by a
contractual, legal or other obligation.

                  (ii) If the Consultant is requested or (in the opinion of his
counsel) required by law or judicial order to disclose any Confidential
Information, the Consultant shall provide the Company with prompt notice of any
such request or requirement so that the Company may seek an appropriate
protective order or waiver of the Consultant's compliance with the provisions of
this Section 5(c). The Consultant will not oppose any reasonable action by, and
will cooperate with, the Company to obtain an appropriate protective order or
other reliable assurance that confidential treatment will be accorded the
Confidential Information. If, failing the entry of a protective order or the
receipt of a waiver hereunder, the Consultant is, in the opinion of his counsel,
compelled by law to disclose a portion of the Confidential Information, the
Consultant 


                                      -4-
<PAGE>

may disclose to the relevant tribunal without liability hereunder that portion
of the Confidential Information which counsel advises the Consultant he is
legally required to disclose, and each of the parties hereto agrees to exercise
such party's best efforts to obtain assurance that confidential treatment will
be accorded such Confidential Information.

                  (e) If an award by a court or arbitration panel declares that
any term or provision of this Section 5 is excessive in duration or scope or is
unreasonable or unenforceable, the parties agree that the court or arbitration
panel making such determination shall have the power to reduce the scope,
duration or area of the term or provision, to delete specific words or phrases,
or to replace any invalid or unenforceable term or provision with a term or
provision that is valid and enforceable and that comes closest to expressing the
intention of the invalid or unenforceable term or provision, and this Agreement
shall be enforceable as so modified.

                  (f) In the event of a breach or threatened breach by the
Consultant of the provisions of this Section 5, the Consultant acknowledges that
the Company will suffer irreparable injury and may not have an adequate remedy
at law and therefore may be entitled to a temporary restraining order or a
preliminary or permanent injunction restraining the Consultant from such breach
without the requirement of posting security or proving actual damages as well as
an equitable accounting of all profits or benefits arising out of such
violation. In addition, in the event of a breach that is not immaterial at any
time by the Consultant of the provisions of this Section 5, the Consultant
agrees as liquidated damages hereunder to repay the full amount of the
non-compete payments made pursuant to Section 5(g). Nothing contained in this
Section 5 or elsewhere in this Agreement shall be construed as prohibiting the
Company from pursuing any other remedies available at law or equity for such
breach or threatened breach by the Consultant.

                  (g) In consideration of the Consultant's covenants under this
Section 5, the Company shall pay the Consultant a non-compete payment at the
annual rate of $1,800,000 in the first year, $1,800,000 in the second year,
$2,300,000 in the third year, $2,300,000 in the fourth year and $2,300,000 in
the fifth year, quarterly in arrears, commencing on the Effective Date.

                  (h) By executing this Agreement, Consultant assigns and
transfers to the Company all his right, title, and interest in and to all
intellectual property created, developed, conceived, or reduced to practice
while employed as a Consultant by the Company or its predecessor(s) arising in
connection with the Services. While he is employed by the Company and when he
ceases to be employed by the Company, Consultant shall fully and promptly
disclose in writing to the Company, and hold in trust for the sole right and
benefit of the Company, all ideas, plans, designs, methods, techniques,
discoveries, inventions, developments, improvements, trade secrets, computer
programs and software, and other proprietary data, records, and information that
Consultant solely or jointly develops or reduces to practice while employed by,
and arising in connection with the Services to, the Company (collectively
"Intellectual Property"), whether or not patentable or capable of copyright or
trademark registration, and whether or not created, conceived, developed, or
reduced to practice at the request of the Company or during normal working
hours. While employed by the Company and at all times thereafter, Consultant
shall do all things, and execute all documents (including applications for
patents, copyrights, and trademarks, and for renewals extensions, and divisions


                                      -5-
<PAGE>

thereof), that are requested and reasonably required by the Company to create,
enforce, or evidence the Company's rights to any Intellectual Property.

                  6. COOPERATION. (a) The Consultant agrees to cooperate with
the Company at all times (including following termination of the Consulting
Period for any reason) by making himself reasonably available to testify on
behalf of the Company or its affiliates, in any action, suit or proceeding,
whether civil, criminal, administrative, or investigative and to assist the
Company or any of its affiliates in any such action, suit, or proceeding by
providing information and meeting and consulting with the Company or
representatives or counsel to the Company or its affiliates, as reasonably
requested by such representatives or counsel. The Consultant shall be reimbursed
by the Company for any expenses (including, but not limited to, legal fees)
reasonably incurred by the Consultant in connection with his compliance with the
foregoing covenant.

                  (b) Consultant shall fully cooperate with the Company and
Computer Associates International, Inc. in connection with filings under the
Hart-Scott-Rodino Antitrust Improvements Act of 1978 and in connection with
resolving any investigation or other inquiry of any governmental entity under
the antitrust laws.

                  (c) In the event the Company fails to observe the requirements
of Section 5.1 of the Merger Agreement, whether or not enforceable or in force
under such agreement, and the aggregate loss or damage is greater than
$1,500,000, then the Consultant shall be liable for 22% of each dollar of
liability under this Section 6 (including, without limitation, forfeitures under
Section 6(d) for such failure in excess of $1,500,000. The maximum amount of
liability under this Section for the Consultant shall be an amount equal to the
sum of the total payments under this Agreement and the value of the 350,000
options issued to the Consultant in 1999.

                  (d) The Consultant agrees that, in the event the Department of
Justice or other governmental entity causes a delay in the closing of the
Merger, with his approval, the Company has amended the terms of the grant of
350,000 options in 1999 to include the following terms:

                  o     none of the options are exercisable until simultaneously
                        with the closing of the Offer described in the Merger
                        Agreement

                  o     if all antitrust issues with the Department of Justice
                        or other governmental entity to permit the completion of
                        the Merger shall have been resolved within the four
                        months following the substantial compliance by Computer
                        Associates International, Inc. and the Company with
                        respect to the Hart-Scott-Rodino Act of 1978 as provided
                        in Section 7.1(e)(i), all options shall be exercisable

                  o     if all antitrust issues with the Department of Justice
                        or other governmental entity to permit the completion of
                        the Merger shall have been resolved within the period
                        described in Section 7.1(e)(iii) of the Merger
                        Agreement, 50% of the options shall be exercisable and
                        the balance shall be forfeited

                  o     if all antitrust issues with the Department of Justice
                        or other governmental entity to permit the completion of
                        the Merger shall have been resolved within 


                                      -6-
<PAGE>

                        the period described in Section 7.1(e)(iv) of the Merger
                        Agreement, 25% of the options shall be exercisable and
                        the balance shall be forfeited.

                  7. CONDITIONS TO EFFECTIVENESS. The Effective Date of this
Agreement (the "EFFECTIVE DATE") shall be the date that the merger of the
Company and a wholly-owned subsidiary of Computer Associates International,
Inc., becomes effective pursuant to the Merger Agreement. In the event the
Merger Agreement terminates, this Agreement shall terminate.

                  8. DUTIES ON TERMINATION. At the Company's request at any time
or upon termination of the Consulting Period for any reason, the Consultant
agrees to deliver promptly to the Company all notebooks, documents, memoranda,
reports, files, samples, books, correspondence, lists, computer tapes or disks,
or other written or graphic records, and the like (and all copies thereof), from
the Company's business, which are or have been in his possession or under his
control.

                  9. SEVERABILITY. In the event that any one or more of the
provisions of this Agreement shall be or become invalid, illegal or
unenforceable in any respect, the validity, legality and enforceability of the
remaining provisions of this Agreement shall not be affected thereby.

                  10. NOTICES. All notices and other communications under this
Agreement shall be in writing and shall be given by first-class mail, certified
or registered with return receipt requested, by reputable overnight carrier or
hand delivery acknowledged in writing by the recipient personally, and shall be
deemed to have been duly given three days after mailing or immediately upon duly
acknowledged hand delivery to the respective persons named below:

         If to the Company:     PLATINUM TECHNOLOGY International, INC.
                                1815 South Meyers Road
                                Oakbrook Terrace, Illinois  60181

                                Attention: Andrew J. Filipowski

                                with a copy to:

                                Computer Associates International, Inc.
                                One Computer Associates Plaza
                                Islandia, New York  11788-7000

                                Attention: Sanjay Kumar
                                           President and Chief Operating Officer


                                      -7-
<PAGE>

                                If to the Consultant:

                                Michael P. Cullinane
                                1815 South Meyers Road
                                Oakbrook Terrace, IL 60181

Either party may change such party's address for notices by notice duly given
pursuant hereto.

                  11. GOVERNING LAW. This agreement and the legal relations thus
created between the parties hereto shall be governed by and construed under and
in accordance with the internal laws of the State of New York without reference
to the principles of conflicts of laws.

                  12. ENTIRE AGREEMENT. Except as specifically set forth herein,
this Agreement represents the entire agreement between the parties hereto with
respect to the subject matter hereof, and supersedes all prior agreements,
representations and understandings. The Consultant acknowledges and agrees that
neither the Company nor anyone acting on its behalf has made, and is not making,
and in executing this Agreement, the Consultant has not relied upon, any
representations, promises or inducements except to the extent the same is
expressly set forth in this Agreement. No amounts payable under this Agreement
shall be considered as compensation under the Consultant's former employment
agreement.

                  13. COUNTERPARTS. This Agreement may be executed in two or 
more counterparts, each of which shall be deemed an original, but all of which
together shall constitute one and the same instrument.

                  14. ASSIGNMENT OF RIGHTS BY THE CONSULTANT. The Consultant may
not assign any rights hereunder without the prior written consent of the
Company. Any such assignment in the absence of such written consent shall be
void. The Company may assign this Agreement to any successor to the Company or a
substantial part of the Company's business or assets provided that upon such
assignment references to the "Company" shall mean Company as it existed prior to
such assignment and further provided that any such assignment shall not expand
Consultant's obligations hereunder.

                  15. AMENDMENTS; WAIVERS. (a) This Agreement may not be
modified, amended, altered or supplemented except upon the written agreement
executed by the parties hereto.

                  (b) No failure or delay by any party in exercising any right,
power or privilege hereunder shall operate as a waiver thereof nor shall any
single or partial exercise thereof preclude any other or further exercise
thereof or the exercise of any other right, power or privilege. The rights and
remedies herein provided shall be cumulative and not exclusive of any rights or
remedies provided by law.


                                      -8-
<PAGE>

                  16. MUTUAL RELEASE. Upon the Effective Date, the Consultant 
is hereby released from and the Company waives, any and all liability, 
claims, damages, causes of action, judgments (including any of the foregoing 
with respect to costs, penalties, losses and expenses) which the Company has 
or may have against the Consultant solely in connection with expenses 
incurred, or non-monetary Company resources used, by the Consultant in the 
performance of his ordinary course duties as an officer of the Company, 
provided that Consultant is not released from any liability pursuant to this 
Agreement. Upon the Effective Date, the Company is hereby released from, and 
the Consultant waives (including any of the foregoing with respect to costs, 
penalties, any and all liability, claims, damages, causes of action, 
judgments, losses and expenses which the Consultant may have against the 
Company solely in connection with expenses the Consultant incurred, or 
non-monetary Company resources used, in the performance of his ordinary 
course duties as an officer of the Company, provided that the Company is not 
released from any liability pursuant to this Agreement, any option agreements 
or any other written agreement entered into by the Consultant in connection 
with the Merger.



                                      -9-
<PAGE>

                  The Company has caused this Agreement to be executed and
delivered by its duly authorized officer and the Consultant has executed and
delivered this Agreement as of the date set forth above.


                                           /s/ Michael P. Cullinane
                                        ------------------------------
                                             MICHAEL P. CULLINANE
                                                  CONSULTANT



                                        PLATINUM TECHNOLOGY INTERNATIONAL, INC.


                                        By: /s/ Andrew J. Filipowski
                                           ---------------------------
                                           Name: Andrew J. Filipowski
                                           Title: President


                                      -10-
<PAGE>

                                   SCHEDULE A


                       DESCRIPTION OF CONSULTING SERVICES
                       ----------------------------------



Transition Services
Integration Services
Customer Relations and Retention
Employee Relations and Retention
Strategic Planning


<PAGE>

                                                                Exhibit 99(c)(6)


                  CONSULTING AND NON-COMPETE AGREEMENT, dated as of March 29,
                  1999 (the "AGREEMENT"), by and between PLATINUM TECHNOLOGY
                  International, INC., a Delaware corporation (the "COMPANY"),
                  and Paul L. Humenansky (the "CONSULTANT").
                  ------------------------------------------------------------


                  The Company is intending to enter into a Merger Agreement with
Computer Associates International, Inc. (the "MERGER AGREEMENT"), pursuant to
which the Company will become a subsidiary of Computer Associates International,
Inc. The Consultant is a senior executive of the Company, has unique knowledge
of the Company's business and has occupied a position of trust and confidence.
The Company and the Consultant desire that, effective upon the Merger (as
defined in the Merger Agreement), the Consultant will continue as a consultant
to the Company and will agree to refrain from competing with the Company all as
set forth in this Agreement.

                  In consideration of the mutual agreements, the Consultant and
the Company agree as follows:

                  1. SERVICES. (a) The Consultant agrees, at the request of the
Company, that for a period of up to six months from the Effective Date (but in
no event later than September 30, 1999), to remain as an employee to provide
transition services in a capacity substantially similar to Consultant's current
employment and with continuation of compensation on the same basis as current
compensation.

                  (b) For the Consulting Period (as defined in Section 2), the
Consultant shall provide from time to time and as requested by the Company the
consulting services set forth in Schedule A (the "SERVICES"). The Consultant
shall report to the President of Computer Associates International, Inc. The
Consultant shall devote such time and energy to the business of the Company as
reasonably required to perform the Services; the parties agree that the
performance of the Services is not intended to require full time effort (and the
Consultant is free to take other full time employment not inconsistent with the
terms of this Agreement). The Company shall not require the Consultant to travel
a greater amount than in connection with his current employment.

                  2. TERM. The Consultant and the Company agree that the
consulting period (the "CONSULTING PERIOD") begins on the later of the Effective
Date (as defined in Section 7) and the date the transition employment services
under Section 1(a) end and ends on the second anniversary of the Effective Date.
The Consultant acknowledges that the Consulting Period may be terminated at any
time, with or without cause or for any or no reason, at the option either of the
Company or the Consultant, on 30 days written notice, as provided in Section 4.

                  3. CONSULTING FEE. Commencing on the Effective Date, the 
Company shall pay the Consultant a consulting fee at the annual rate of
$500,000, payable quarterly in arrears. The Company shall reimburse Consultant
for all reasonable costs and expenses incurred in connection with Consultant's
performance of the Services.


<PAGE>

                  4. TERMINATION. (a) TERMINATION WITHOUT CAUSE. If the Company
terminates the Consulting Period without Cause prior to the second anniversary
of the Effective Date, the Consultant shall be entitled to continued payment of
all consulting fees.

                  (b) TERMINATION FOR CAUSE. If (i) the Company terminates the
Consulting Period at any time for Cause, or (ii) the Consultant terminates the
Consulting Period at any time, the Consultant shall be entitled to receive the
consulting fees paid through the date of termination. "CAUSE" shall mean (A) the
Consultant's material breach of any material term of this Agreement, including,
but not limited to, the covenants set forth in Section 5 hereof, subject to the
Consultant's right to cure any breach that is curable within a reasonable period
following notice by the Company, (B) the Consultant's conviction of a felony, or
(C) any willful misconduct by the Consultant resulting in substantial loss to
the Company, substantial damage to the Company's reputation or judicially
determined theft or misappropriation from the Company.

                  (c) TERMINATION UPON DEATH OR DISABILITY. If the Consultant
dies or becomes Disabled, in which event the Consulting Period shall terminate,
the Consultant (or, in the case of death, his estate), shall be entitled to
continued payment of all consulting fees as death or disability benefits.
"DISABLED" shall mean the Consultant's adjudication as mentally incompetent, or
the occurrence of a mental or physical disability for 120 or more days within
any calendar year. Any question as to the existence of his disability as to
which the Consultant and the Company cannot agree shall be determined in writing
by a qualified independent physician mutually acceptable to the Consultant and
the Company. If the Consultant and the Company cannot agree on a qualified
independent physician, each shall appoint such a physician and those two
physicians shall select a third who shall make such determination in writing.
The determination of disability made in writing to the Consultant and the
Company shall be final and conclusive for all purposes.

                  (d) GENERAL. Upon the termination of the Consulting Period,
for any reason, (i) the Company shall have no further obligations to the
Consultant hereunder, other than as specifically set forth in this Agreement and
(ii) the Consultant shall continue to be bound (subject to the time periods and
limitations set forth herein) by the terms of this Agreement other than Section
1. Confidential Information shall remain confidential under Section 5(c) for so
long as such information is "CONFIDENTIAL INFORMATION".

                  5. NON-COMPETITION; CONFIDENTIALITY; PAYMENTS. (a) In
consideration for, and as a condition to, the Company's payment of the
non-compete payment and entering into this Agreement, and in connection with the
merger described herein, until the fifth anniversary of the later of the
Effective Date and the date the transition employment services under Section
1(a) end, the Consultant will not directly or indirectly, on Consultant's own
behalf or in the service of or on behalf of any other individual or entity,
either as a proprietor, employee, agent, independent contractor, consultant,
director, officer, partner or stockholder (other than a stockholder of a
corporation listed on a national securities exchange or whose stock is regularly
traded in the over-the-counter market, provided that the Consultant at no time
owns, directly or indirectly, in excess of 2% of the outstanding stock of any
class of any such corporation):

                           (i) participate or engage in any activities or
         business developing, manufacturing, marketing or distributing any
         products or services offered by the 



                                      -2-
<PAGE>

         Company on the date of this Agreement, or any products or services
         offered by the Company in the future and in which the Consultant
         actively participated, recognizing that the Company offers products
         and services globally ("COMPETITIVE ACTIVITIES"), including, without
         limitation, (A) selling goods or rendering services of the type (or
         similar to the type) sold or rendered by the Company, whether by
         means of electronic, traditional or other form of commerce; (B)
         soliciting any person or entity that is a current customer, that has
         been a customer within the past three years or that is or was a
         prospective customer prior to or during the Consulting Period, in
         each case, of the Company or an affiliate of the Company (provided
         that it shall not be deemed a breach of this Agreement if the
         Consultant solicits such customers for goods or services unrelated
         to the Competitive Activities), (C) assisting any person in any way
         to do, or attempt to do, anything prohibited by clauses (A) or (B)
         above and (D) be employed by any person or entity that has received
         services of the type described above from the Consultant or with
         which the Consultant otherwise had material contact while employed
         by the Company or which received services of the type describe above
         from any office or employee of the Company over which Consultant had
         management responsibility, in either case to provide or supervise,
         directly or indirectly, the services comprising a Competitive
         Activity; or

                           (ii) perform any action, activity or course of
         conduct which is detrimental in any material respect to the businesses
         or business reputation of the Company (or any of its affiliates),
         including without limitation (A) soliciting, recruiting or hiring any
         employees of the Company (or any of its affiliates) or persons who have
         worked for the Company (or any of its affiliates) at any time since
         January 1, 1998; provided that the Consultant may hire any employee of
         the Company (I) that has been terminated by the Company, (II) in
         connection with a business that is not a Competitive Activity
         (including any VC Business that is not a Competitive Activity), but
         Consultant may not solicit or recruit for such purposes, or (III) to
         work in a VC Business (as hereinafter defined), but not to work in or
         for any company in which any VC Business invests or otherwise acquires
         an interest, and (B) soliciting or encouraging any employee of the
         Company (or any of its affiliates) to leave the employment of the
         Company.

                  (b) Notwithstanding anything to the contrary herein,
Consultant may remain a director at those companies for which Consultant is a
director as of the Effective Date and may engage in any activities or
businesses:

                  (i) involving venture capital activities (a "VC Business"),
including, without limitation, activities undertaken through Platinum Venture
Partners or any similar entities as may be formed in the future, holding
directorships, and through such partnerships exercising veto power over certain
decisions in companies which venture capital investments have been made;
provided that the Consultant shall not without permission in any such venture
invest in any company whose primary business is a Competitive Activity; or

                  (ii) for which the Company has given permission in writing,
which shall not be unreasonably withheld (or delayed) after the third
anniversary of the Effective Date, provided Consultant's engaging in such
activities or business would not have a material adverse impact on any of the
Company's lines of business; or


                                      -3-
<PAGE>

                  (iii) which Computer Associates International, Inc. shall have
confirmed (which confirmation shall not be unreasonably withheld or delayed) in
writing to Consultant are not inconsistent with the prohibitions of Sections
5(a) and 5(b) hereof.

                  (c) The Consultant shall not, without the written consent of
the Company, disclose to any other person or use, whether directly or
indirectly, any Confidential Information relating to or used by the Company or
any of its affiliates, whether in written, oral or other form, except in
connection with the performance of his duties hereunder. "CONFIDENTIAL
INFORMATION" shall mean information about the Company or any of its affiliates,
and their clients and customers that is not disclosed by the Company or any of
its affiliates for financial reporting purposes and that was learned by the
Consultant in the course of employment by the Company or any of its affiliates
or in the course of performing the services under this Agreement, including
(without limitation) any proprietary knowledge, product and service designs,
trade secrets, manuals, technical information and plans, contracts, systems,
procedures, databases, electronic files, disks and printouts, correspondence,
internal reports, personnel files, information about employees of the Company
and its affiliates relating to their education, experience, skills, abilities,
compensation and benefits, and inter-personal relationships with suppliers to
and customers of the Company and its affiliates, sales and advertising material,
business plans, marketing plans, financial data (including without limitation
the revenues, costs or profits associated with services), customer and industry
lists, customer information, customer lists coupled with product or service
pricing, customer contacts, supplier contacts and other contact information,
pricing policies, supplies, agents, risk analyses, engineering information and
computer reports, computer software, computer systems, computer formats,
computer screen designs and computer input and output specifications, inclusive
of any pertinent documentation, techniques, processes, technical information and
know-how. The Consultant acknowledges that such Confidential Information is
specialized, unique in nature and of great value to the Company and its
affiliates, and that such information gives the Company and its affiliates a
competitive advantage. The Consultant's obligations under this Section 5(b)
shall survive the termination of the Consulting Period and of this Agreement and
shall be fully enforceable thereafter in accordance with the terms of this
Agreement.

                  (d) (i) Confidential Information does not include information
which (A) is or becomes part of the public domain other than as a result of the
Consultant's disclosure, or (B) becomes available to the Consultant on a
nonconfidential basis from a source other than the Company, provided that source
is not bound with respect to that information by a confidentiality agreement
with the Company or otherwise prohibited from transmitting that information by a
contractual, legal or other obligation.

                  (ii) If the Consultant is requested or (in the opinion of his
counsel) required by law or judicial order to disclose any Confidential
Information, the Consultant shall provide the Company with prompt notice of any
such request or requirement so that the Company may seek an appropriate
protective order or waiver of the Consultant's compliance with the provisions of
this Section 5(c). The Consultant will not oppose any reasonable action by, and
will cooperate with, the Company to obtain an appropriate protective order or
other reliable assurance that confidential treatment will be accorded the
Confidential Information. If, failing the entry of a protective order or the
receipt of a waiver hereunder, the Consultant is, in the opinion of his counsel,
compelled by law to disclose a portion of the Confidential Information, the
Consultant 


                                      -4-
<PAGE>

may disclose to the relevant tribunal without liability hereunder that portion
of the Confidential Information which counsel advises the Consultant he is
legally required to disclose, and each of the parties hereto agrees to exercise
such party's best efforts to obtain assurance that confidential treatment will
be accorded such Confidential Information.

                  (e) If an award by a court or arbitration panel declares that
any term or provision of this Section 5 is excessive in duration or scope or is
unreasonable or unenforceable, the parties agree that the court or arbitration
panel making such determination shall have the power to reduce the scope,
duration or area of the term or provision, to delete specific words or phrases,
or to replace any invalid or unenforceable term or provision with a term or
provision that is valid and enforceable and that comes closest to expressing the
intention of the invalid or unenforceable term or provision, and this Agreement
shall be enforceable as so modified.

                  (f) In the event of a breach or threatened breach by the
Consultant of the provisions of this Section 5, the Consultant acknowledges that
the Company will suffer irreparable injury and may not have an adequate remedy
at law and therefore may be entitled to a temporary restraining order or a
preliminary or permanent injunction restraining the Consultant from such breach
without the requirement of posting security or proving actual damages as well as
an equitable accounting of all profits or benefits arising out of such
violation. In addition, in the event of a breach (that is not immaterial) at any
time by the Consultant of the provisions of this Section 5, the Consultant
agrees as liquidated damages hereunder to repay the full amount of the
non-compete payments made pursuant to Section 5(g). Nothing contained in this
Section 5 or elsewhere in this Agreement shall be construed as prohibiting the
Company from pursuing any other remedies available at law or equity for such
breach or threatened breach by the Consultant.

                  (g) In consideration of the Consultant's covenants under this
Section 5, the Company shall pay the Consultant a non-compete payment at the
annual rate of $1,800,000 in the first year, $1,800,000 in the second year,
$2,300,000 in the third year, $2,300,000 in the fourth year and $2,300,000 in
the fifth year, quarterly in arrears, commencing on the Effective Date.

                  (h) By executing this Agreement, Consultant assigns and
transfers to the Company all his right, title, and interest in and to all
intellectual property created, developed, conceived, or reduced to practice
while employed as a Consultant by the Company or its predecessor(s) arising in
connection with the Services. While he is employed by the Company and when he
ceases to be employed by the Company, Consultant shall fully and promptly
disclose in writing to the Company, and hold in trust for the sole right and
benefit of the Company, all ideas, plans, designs, methods, techniques,
discoveries, inventions, developments, improvements, trade secrets, computer
programs and software, and other proprietary data, records, and information that
Consultant solely or jointly develops or reduces to practice while employed by,
and arising in connection with the Services to, the Company (collectively
"Intellectual Property"), whether or not patentable or capable of copyright or
trademark registration, and whether or not created, conceived, developed, or
reduced to practice at the request of the Company or during normal working
hours. While employed by the Company and at all times thereafter, Consultant
shall do all things, and execute all documents (including applications for
patents, copyrights, and trademarks, and for renewals extensions, and divisions


                                      -5-
<PAGE>

thereof), that are requested and reasonably required by the Company to create,
enforce, or evidence the Company's rights to any Intellectual Property.

                  6. COOPERATION. (a) The Consultant agrees to cooperate with
the Company at all times (including following termination of the Consulting
Period for any reason) by making himself reasonably available to testify on
behalf of the Company or its affiliates, in any action, suit or proceeding,
whether civil, criminal, administrative, or investigative and to assist the
Company or any of its affiliates in any such action, suit, or proceeding by
providing information and meeting and consulting with the Company or
representatives or counsel to the Company or its affiliates, as reasonably
requested by such representatives or counsel. The Consultant shall be reimbursed
by the Company for any expenses (including, but not limited to, legal fees)
reasonably incurred by the Consultant in connection with his compliance with the
foregoing covenant.

                  (b) Consultant shall fully cooperate with the Company and
Computer Associates International, Inc. in connection with filings under the
Hart-Scott-Rodino Antitrust Improvements Act of 1978 and in connection with
resolving any investigation or other inquiry of any governmental entity under
the antitrust laws.

                  (c) In the event the Company fails to observe the requirements
of Section 5.1 of the Merger Agreement, whether or not enforceable or in force
under such agreement, and the aggregate loss or damage is greater than
$1,500,000, then the Consultant shall be liable for 22% of each dollar of
liability under this Section 6 (including, without limitation, forfeitures under
Section 6(d) for such failure in excess of $1,500,000. The maximum amount of
liability under this Section for the Consultant shall be an amount equal to the
sum of the total payments under this Agreement and the value of the 400,000
options issued to the Consultant in 1999.

                  (d) The Consultant agrees that, in the event the Department of
Justice or other governmental entity causes a delay in the closing of the
Merger, with his approval, the Company has amended the terms of the grant of
400,000 options in 1999 to include the following terms:

                  o     none of the options are exercisable until simultaneously
                        with the closing of the Offer described in the Merger
                        Agreement

                  o     if all antitrust issues with the Department of Justice
                        or other governmental entity to permit the completion of
                        the Merger shall have been resolved within the four
                        months following the substantial compliance by Computer
                        Associates International, Inc. and the Company with
                        respect to the Hart-Scott-Rodino Act of 1978 as provided
                        in Section 7.1(e)(i), all options shall be exercisable

                  o     if all antitrust issues with the Department of Justice
                        or other governmental entity to permit the completion of
                        the Merger shall have been resolved within the period
                        described in Section 7.1(e)(iii) of the Merger
                        Agreement, 50% of the options shall be exercisable and
                        the balance shall be forfeited

                  o     if all antitrust issues with the Department of Justice
                        or other governmental entity to permit the completion of
                        the Merger shall have been resolved within 


                                      -6-
<PAGE>

                        the period described in Section 7.1(e)(iv) of the Merger
                        Agreement, 25% of the options shall be exercisable and
                        the balance shall be forfeited.

                  7. CONDITIONS TO EFFECTIVENESS. The Effective Date of this
Agreement (the "EFFECTIVE DATE") shall be the date that the merger of the
Company and a wholly-owned subsidiary of Computer Associates International,
Inc., becomes effective pursuant to the Merger Agreement. In the event the
Merger Agreement terminates, this Agreement shall terminate.

                  8. DUTIES ON TERMINATION. At the Company's request at any time
or upon termination of the Consulting Period for any reason, the Consultant
agrees to deliver promptly to the Company all notebooks, documents, memoranda,
reports, files, samples, books, correspondence, lists, computer tapes or disks,
or other written or graphic records, and the like (and all copies thereof), from
the Company's business, which are or have been in his possession or under his
control.

                  9. SEVERABILITY. In the event that any one or more of the
provisions of this Agreement shall be or become invalid, illegal or
unenforceable in any respect, the validity, legality and enforceability of the
remaining provisions of this Agreement shall not be affected thereby.

                  10. NOTICES. All notices and other communications under this
Agreement shall be in writing and shall be given by first-class mail, certified
or registered with return receipt requested, by reputable overnight carrier or
hand delivery acknowledged in writing by the recipient personally, and shall be
deemed to have been duly given three days after mailing or immediately upon duly
acknowledged hand delivery to the respective persons named below:

         If to the Company:     PLATINUM TECHNOLOGY International, INC.
                                1815 South Meyers Road
                                Oakbrook Terrace, Illinois  60181

                                Attention: Andrew J. Filipowski

                                with a copy to:

                                Computer Associates International, Inc.
                                One Computer Associates Plaza
                                Islandia, New York  11788-7000

                                Attention: Sanjay Kumar
                                           President and Chief Operating Officer

                                If to the Consultant:

                                Paul L. Humenansky
                                1815 South Meyers Road
                                Oakbrook Terrace, IL 60181


                                      -7-
<PAGE>

Either party may change such party's address for notices by notice duly given
pursuant hereto.

                  11. GOVERNING LAW. This agreement and the legal relations thus
created between the parties hereto shall be governed by and construed under and
in accordance with the internal laws of the State of New York without reference
to the principles of conflicts of laws.

                  12. ENTIRE AGREEMENT. Except as specifically set forth herein,
this Agreement represents the entire agreement between the parties hereto with
respect to the subject matter hereof, and supersedes all prior agreements,
representations and understandings. The Consultant acknowledges and agrees that
neither the Company nor anyone acting on its behalf has made, and is not making,
and in executing this Agreement, the Consultant has not relied upon, any
representations, promises or inducements except to the extent the same is
expressly set forth in this Agreement. No amounts payable under this Agreement
shall be considered as compensation under the Consultant's former employment
agreement.

                  13. COUNTERPARTS. This Agreement may be executed in two or 
more counterparts, each of which shall be deemed an original, but all of which
together shall constitute one and the same instrument.

                  14. ASSIGNMENT OF RIGHTS BY THE CONSULTANT. The Consultant may
not assign any rights hereunder without the prior written consent of the
Company. Any such assignment in the absence of such written consent shall be
void. The Company may assign this Agreement to any successor to the Company or a
substantial part of the Company's business or assets provided that upon such
assignment references to the "Company" shall mean Company as it existed prior to
such assignment and further provided that any such assignment shall not expand
Consultant's obligations hereunder.

                  15. AMENDMENTS; WAIVERS. (a) This Agreement may not be
modified, amended, altered or supplemented except upon the written agreement
executed by the parties hereto.

                  (b) No failure or delay by any party in exercising any right,
power or privilege hereunder shall operate as a waiver thereof nor shall any
single or partial exercise thereof preclude any other or further exercise
thereof or the exercise of any other right, power or privilege. The rights and
remedies herein provided shall be cumulative and not exclusive of any rights or
remedies provided by law.


                                      -8-
<PAGE>

                  16. MUTUAL RELEASE. Upon the Effective Date, the Consultant 
is hereby released from and the Company waives, any and all liability, 
claims, damages, causes of action, judgments (including any of the foregoing 
with respect to costs, penalties, losses and expenses) which the Company has 
or may have against the Consultant solely in connection with expenses 
incurred, or non-monetary Company resources used, by the Consultant in the 
performance of his ordinary course duties as an officer of the Company, 
provided that Consultant is not released from any liability pursuant to this 
Agreement. Upon the Effective Date, the Company is hereby released from, and 
the Consultant waives (including any of the foregoing with respect to costs, 
penalties, any and all liability, claims, damages, causes of action, 
judgments, losses and expenses which the Consultant may have against the 
Company solely in connection with expenses the Consultant incurred, or 
non-monetary Company resources used, in the performance of his ordinary 
course duties as an officer of the Company, provided that the Company is not 
released from any liability pursuant to this Agreement, any option agreements 
or any other written agreement entered into by the Consultant in connection 
with the Merger

                                      -9-
<PAGE>

                  The Company has caused this Agreement to be executed and
delivered by its duly authorized officer and the Consultant has executed and
delivered this Agreement as of the date set forth above.


                                          /s/ Paul L. Humenansky
                                        ------------------------------
                                              PAUL L. HUMENANSKY
                                                  CONSULTANT



                                        PLATINUM TECHNOLOGY INTERNATIONAL, INC.


                                        By: /s/ Andrew J. Filipowski
                                           ---------------------------
                                           Name: Andrew J. Filipowski
                                           Title: President


                                      -10-
<PAGE>

                                   SCHEDULE A


                       DESCRIPTION OF CONSULTING SERVICES
                       ----------------------------------



Transition Services
Integration Services
Customer Relations and Retention
Employee Relations and Retention
Strategic Planning



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