MASTERING INC
SC 13D/A, 1998-04-17
BUSINESS SERVICES, NEC
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D
                                 (Rule 13d-101)

       INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO 13d-1(a)
                AND AMENDMENTS THERETO FILED PURSUANT TO 13d-2(a)

                               (Amendment No. 1)1


                                 MASTERING, INC.
- --------------------------------------------------------------------------------
                                (Name of issuer)


                   COMMON STOCK, PAR VALUE OF $.001 PER SHARE
- --------------------------------------------------------------------------------
                         (Title of class of securities)

                                   269837 10 0
- --------------------------------------------------------------------------------
                                 (CUSIP number)

                               Terence M. Graunke
                                 Mastering, Inc.
                            676 North Michigan Avenue
                                   Suite 3410
                                Chicago, IL 60611
- --------------------------------------------------------------------------------
   (Name, address and telephone number of person authorized to receive notices
                               and communications)


                                  April 7, 1998
     -----------------------------------------------------------------------
             (Date of event which requires filing of this statement)

         If the filing person has  previously  filed a statement on Schedule 13G
to report the  acquisition  which is the subject of this  Schedule  13D,  and is
filing this schedule because of Rule 13d-1(b)(3) or (4), check the following box
|_|.

         Note:    Six copies of this statement,  including all exhibits,  should
                  be filed  with the  Commission.  See Rule  13d-1(a)  for other
                  parties to whom copies are to be sent.

                         (Continued on following pages)

                               (Page 1 of 5 Pages)



- --------
1        The  remainder  of this cover page shall be filled out for a  reporting
person's  initial  filing on this  form with  respect  to the  subject  class of
securities,  and for any subsequent amendment containing information which would
alter disclosures provided in a prior cover page.

         The information  required on the remainder of this cover page shall not
be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934 or otherwise  subject to the  liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).
<PAGE>
- -------------------------                                  ---------------------
CUSIP No. 269837 10 0                   13D                  Page 2  of 5 Pages
- -------------------------                                  ---------------------

- --------------------------------------------------------------------------------
1             NAME OF REPORTING PERSON
              S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

              Terence M. Graunke
- --------------------------------------------------------------------------------
2             CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP   (a) |_|
                                                                 (b) |_|

- --------------------------------------------------------------------------------
3             SEC USE ONLY

- --------------------------------------------------------------------------------
4             SOURCE OF FUNDS

              N/A
- --------------------------------------------------------------------------------
5             CHECK BOX IF DISCLOSURE OF LEGAL  PROCEEDINGS IS REQUIRED PURSUANT
              TO ITEMS 2(d) OR 2(e)|_|

- --------------------------------------------------------------------------------
6             CITIZENSHIP OR PLACE OF ORGANIZATION

              UNITED STATES
- --------------------------------------------------------------------------------
                                            7       SOLE VOTING POWER
              NUMBER OF
                                                    3,504,548
                SHARES
                                            8       SHARED VOTING POWER  
             BENEFICIALLY
                                                    N/A
               OWNED BY
                                            9       SOLE DISPOSITIVE POWER
                 EACH
                                                    3,504,548
              REPORTING
                                           10       SHARED DISPOSITIVE POWER
             PERSON WITH
                                                    N/A
- --------------------------------------------------------------------------------
     11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON*

              3,504,548
- --------------------------------------------------------------------------------
     12       CHECK BOX IF THE  AGGREGATE  AMOUNT IN ROW (11)  EXCLUDES  CERTAIN
              SHARES |_|

- --------------------------------------------------------------------------------
     13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

              approximately 25.3%
- --------------------------------------------------------------------------------
     14       TYPE OF REPORTING PERSON

              IN
- --------------------------------------------------------------------------------
<PAGE>
- -------------------------                                  ---------------------
CUSIP No. 269837 10 0                   13D                  Page 3  of 5 Pages
- -------------------------                                  ---------------------



This Amendment No. 1 amends and  supplements the Statement on Schedule 13D dated
February 28, 1998 (such  original  Schedule 13D being  referred to herein as the
"Statement"),  by Terence M.  Graunke  relating to the common  stock,  par value
$.001 per share (the "Common Stock") of MASTERING,  INC., a Delaware corporation
(the "Company").

Item 4.  Purpose of Transaction.
         -----------------------

Item 4 is hereby  amended by the addition of the following and the deletion from
the Statement of any statements therein that are inconsitent with the following:

                  On April 7, 1998,  Mr.  Graunke  executed  an  agreement  (the
"Stockholder Agreement") with PLATINUM technology, inc. ("PLATINUM") pursuant to
which Mr. Graunke agreed,  among other things, to vote shares of Common Stock he
owns (1) in favor of the  Agreement  and Plan of Merger dated as of February 18,
1998,  as amended (the "Merger  Agreement")  among the Company,  PLATINUM and PT
Acquisition  Corporation I whereby PT Acquisition  Corporation I would be merged
with and into the Company and the Company would become a wholly owned subsidiary
of  PLATINUM  (the  "Merger")  and (2)  generally  against  any action  which is
intended  or could  reasonably  be expected to impede,  interfere  with,  delay,
postpone  or  materially  adversely  affect  the  Merger  and  the  transactions
contemplated by the Merger Agreement and the Stockholder  Agreement.  The Merger
Agreement and the Stockholder Agreement are exhibits to this Amendment No. 1 and
the description  contained  herein of the terms of the Merger  Agreement and the
Stockholder  Agreement  is  qualified  in its  entirety  by  reference  to  such
exhibits.

Item 5.  Interest in Securities of the Issuer.
         -------------------------------------

Item 5 is hereby  amended by the addition of the following and the deletion from
the Statement of any statements therein that are inconsitent with the following:

                  (a) As of April 7, 1998, Mr. Graunke beneficially owned in the
aggregate  3,504,548 shares of the Company's Common Stock. Based upon the number
of shares  outstanding as of the close of business on April 7, 1998, as reported
by the Company to be 13,875,050,  such shares constitute  approximately 25.3% of
the outstanding shares of the Company's Common Stock.

                  Of  the  3,504,548   shares  of  the  Company's  Common  Stock
beneficially owned by Mr. Graunke, 472,100 of such shares represent the right to
acquire  shares of the  Company's  Common Stock  through the exercise of options
which are currently  exercisable or will be exercisable  within 60 days of April
7, 1998.

                  (b) Mr.  Graunke  has sole voting and  dispositive  power with
respect to all 3,504,548 shares of the Company's Common Stock beneficially owned
by him.

                  (c) Not applicable.

                  (d) Not applicable.

                  (e) Not applicable.

Item 6.  Contracts, Arrangement, Understanding or
         Relationships with Respect to Securities of the Issuer.
         -------------------------------------------------------

                  See Item 4.
<PAGE>
- -------------------------                                  ---------------------
CUSIP No. 269837 10 0                   13D                  Page 4  of 5 Pages
- -------------------------                                  ---------------------


Item 7.  Material to be Filed as Exhibits.
         ---------------------------------


Exhibit Number           Description
- --------------           -----------

      1                  Agreement  and Plan of Merger  dated as of February 18,
                         1998 among Mastering,  Inc., PLATINUM technology,  inc.
                         and  PT  Acquisition   Corporation  I  (incorpoated  by
                         reference  to the  exhibits  to the  Company's  Current
                         Report on Form 8-K dated February 20, 1998).

      2                  First  Amendment to Agreement  and Plan of Merger dated
                         as of April 7, 1998  among  Mastering,  Inc.,  PLATINUM
                         technology,  inc.  and  PT  Acquisition  Corporation  I
                         (incorporated by reference to exhibit 2.2 of PLATINUM's
                         Registration   Statement   on  Form   S-4   (file   no.
                         33349875)).

      3                  Form of Stockholder Agreement dated as of April 7, 1998
                         between   PLATINUM   technology,   inc.   and   certain
                         stockholders of the Company.

<PAGE>
- -------------------------                                  ---------------------
CUSIP No. 269837 10 0                   13D                  Page 5  of 5 Pages
- -------------------------                                  ---------------------

                                    SIGNATURE
                                    ---------


                  After  reasonable  inquiry and to the best of my knowledge and
belief,  I certify  that the  information  set forth in this  statement is true,
complete and correct.



                                                      April 17, 1998
                                             --------------------------------
                                                          (Date)



                                                  /s/ Terence M. Graunke
                                             --------------------------------
                                                       (Signature)



                                                  Terence M. Graunke
                                             --------------------------------
                                                       (Name)

                              STOCKHOLDER AGREEMENT

         THIS  STOCKHOLDER  AGREEMENT  (the  "Agreement"),  dated as of April 7,
1998,  is by and  between  PLATINUM  technology,  inc.,  a Delaware  corporation
("Parent"),   PT  Acquisition   Corporation  I,  a  Delaware   corporation   and
wholly-owned  subsidiary  of  Parent  ("Merger  Sub"),  and the  stockholder  or
optionholder  of  Mastering,   Inc.,  a  Delaware  corporation  (the  "Company")
indicated on the signature page hereof (the "Stockholder").

                                    RECITALS

         A. Concurrent with the execution of this Agreement,  Parent, Merger Sub
and  the  Company  entered  into a  First  Amendment  (the  "Amendment")  to the
Agreement and Plan of Merger,  dated  February 18, 1998 (as amended from time to
time, the "Merger Agreement"), pursuant to which Merger Sub is to be merged with
and into the Company (the "Merger").

         B. As an  inducement  and a condition to entering  into the  Amendment,
Parent required that the Stockholder  agree, and the Stockholder has agreed,  to
enter into this Agreement.

         NOW,  THEREFORE,  in  consideration  of the  foregoing  and the  mutual
promises, representations, warranties, covenants and agreements contained herein
and for other good and valuable  consideration,  the receipt and  sufficiency of
which are hereby  acknowledged,  the  parties  hereto,  intending  to be legally
bound, hereby agree as follows:

         1.  Certain  Definitions.  In addition to the terms  defined  elsewhere
herein,  capitalized  terms  used and not  defined  herein  have the  respective
meanings  ascribed  to  them  in the  Merger  Agreement.  For  purposes  of this
Agreement:

         (a)  "Beneficially  Own" or "Beneficial  Ownership" with respect to any
securities means having "beneficial  ownership" of such securities as determined
pursuant to Rule 13d-3 under the  Securities  Exchange  Act of 1934,  as amended
(the "Exchange Act").

         (b)   "Existing   Shares"   means  shares  of  Company   Capital  Stock
Beneficially Owned by the Stockholder as of the date hereof.

         (c) "Securities"  means the Existing Shares together with any shares of
Company   Capital  Stock  or  other   securities  of  the  Company  that  become
Beneficially  Owned by the Stockholder in any capacity after the date hereof and
prior  to the  termination  of this  Agreement,  whether  upon the  exercise  of
options,  warrants or rights,  the  conversion  or exchange  of  convertible  or
exchangeable  securities,  or by  means  of  purchase,  dividend,  distribution,
split-up,  recapitalization,  combination, exchange of shares or the like, gift,
bequest, inheritance or as a successor in interest in any capacity or otherwise.

         2. Disclosure.  The Stockholder hereby agrees to permit the Company and
Parent  to  publish  and  disclose  in  the   Registration   Statement  and  the
Prospectus/Proxy Statement (including all documents and schedules filed with the
SEC), and any press release or other disclosure document which Parent reasonably
determines to be necessary or desirable in
<PAGE>
connection  with  the  Merger  and  any  transactions   related   thereto,   the
Stockholder's  identity and ownership of Company Capital Stock and the nature of
the  Stockholder's  commitments,  arrangements  and  understandings  under  this
Agreement.

         3. Voting of Company Capital Stock. The Stockholder hereby agrees that,
during the period  commencing on the date hereof and continuing  until the first
to  occur  of (a) the  Effective  Time,  (b)  valid  termination  of the  Merger
Agreement pursuant to Section 7.1(a), 7.1(b)(i),  7.1(c)(i), (c)(ii) or (c)(iv),
or 7.1(d),  (c) 30 days after  termination of the Merger  Agreement  pursuant to
Section  7.1(b)(ii) or (b)(iii) or 7.1(c)(iii) or 7.1(e) of the Merger Agreement
under circumstances where the last sentence of this Section 3 does not apply, or
(d) 180 days after the date hereof (the first to occur of clauses  (a),  (b) (c)
and (d), the "Termination  Date"), at any meeting (whether annual or special and
whether or not an  adjourned  or  postponed  meeting)  of the holders of Company
Capital Stock,  however called, or in connection with any written consent of the
holders of Company  Capital  Stock,  he, she or it will appear at the meeting or
otherwise  cause the Securities to be counted as present thereat for purposes of
establishing  a quorum and vote or consent  (or cause to be voted or  consented)
the  Securities  (A) in favor of the  adoption of the Merger  Agreement  and the
approval of the other  actions  contemplated  by the Merger  Agreement  and this
Agreement  and any actions  required  in  furtherance  thereof  and hereof;  (B)
against any action or agreement  that would result in a breach in any respect of
any covenant,  representation or warranty, or any other obligation or agreement,
of the Company under the Merger  Agreement or this Agreement;  and (C) except as
otherwise  agreed to in writing  in  advance  by Parent in its sole  discretion,
against  the  following  actions  (other  than the Merger  and the  transactions
contemplated  by this Agreement and the Merger  Agreement):  (1) any Acquisition
Proposal, (2) (u) any change in a majority of the individuals who constitute the
Company's   Board  of  Directors;   (v)  any  material  change  in  the  present
capitalization of the Company, including without limitation any proposal to sell
a substantial  equity interest in the Company or its Subsidiaries or substantial
assets of the Company or its  Subsidiaries;  (w) any  amendment of the Company's
Certificate of  Incorporation  or By-laws;  (x) any other material change in the
Company's  corporate  structure  or  business;  or (y) any other action which is
intended,  or could reasonably be expected,  to impede,  interfere with,  delay,
postpone  or  materially  adversely  affect  the  Merger  and  the  transactions
contemplated  by  this  Agreement  and  the  Merger   Agreement.   Each  of  the
Stockholders  agrees  that he,  she or it will not enter into any  agreement  or
understanding  with any person the intended or reasonably  anticipated effect of
which would be inconsistent with or violative of any provision contained in this
Section  3. In  addition,  the  Stockholder  hereby  agrees  that if the  Merger
Agreement is terminated pursuant to Section 7.1(b)(ii) or (b)(iii), 7.1(c)(iii),
7.1(e) or 7.1(f) and,  prior to such  termination,  there shall have been made a
Superior Proposal or Acquisition  Proposal,  then for a period of 365 days after
the date hereof the Stockholder will not vote in favor of such Superior Proposal
or  Acquisition  Proposal or any proposal made by the person or entity that made
such Superior  Proposal or Acquisition  Proposal or any affiliate of such person
or entity and will not sell the  Securities  (by means of a tender or otherwise)
to the person or entity making such Superior Proposal or Acquisition Proposal or
any affiliate of such person or entity.

         4.  Covenants,  Representations  and  Warranties  of  Stockholder.  The
Stockholder  hereby  represents  and  warrants  to, and agrees  with,  Parent as
follows:
                                       2
<PAGE>
         (a)  Ownership  of  Shares.  The  Stockholder  is the sole  record  and
Beneficial  Owner of the number of Existing  Shares  opposite the  Stockholder's
name on the signature page hereof,  and on the date hereof such Existing  Shares
constitute  all of the  shares  of  Company  Capital  Stock  owned of  record or
Beneficially Owned by the Stockholder. The Stockholder has sole voting power and
sole  power to issue  instructions  with  respect  to the  matters  set forth in
Section 3 hereof,  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
Stockholder's   Existing   Shares  with  no   limitations,   qualifications   or
restrictions  on such rights,  subject to applicable  securities  laws,  and the
terms of this Agreement.

         (b)  Authorization.  This Agreement has been duly and validly  executed
and delivered by the Stockholder  and constitutes a valid and binding  agreement
enforceable  against the  Stockholder in accordance with its terms except (i) as
may be limited by applicable  bankruptcy,  insolvency or similar laws  affecting
creditors rights and (ii) that the remedy of specific performance and injunctive
and other forms of equitable relief may be subject to equitable  defenses and to
the discretion of the court before which any proceeding therefor may be brought.

         (c) No  Conflicts.  Except for  filings,  authorizations,  consents and
approvals as may be required under the Exchange Act and the Securities  Act, (i)
no filing with, and no permit, authorization,  consent or approval of, any state
or federal  Governmental Entity is necessary for the execution of this Agreement
by the Stockholder and the  consummation by the Stockholder of the  transactions
contemplated  hereby  and  (ii)  none  of the  execution  and  delivery  of this
Agreement  by  the  Stockholder,  the  consummation  by the  Stockholder  of the
transactions  contemplated  hereby or compliance by the Stockholder  with any of
the  provisions  hereof  will (A)  conflict  with or result in any breach of the
organizational  documents of the  Stockholder (if  applicable),  (B) result in a
violation or breach of, or constitute  (with or without  notice or lapse of time
or both) a  default  (or give  rise to any  third  party  right of  termination,
cancellation,  material  modification or  acceleration)  under any of the terms,
conditions or provisions of any note, loan agreement, bond, mortgage, indenture,
license, contract, commitment,  arrangement,  understanding,  agreement or other
instrument or obligation of any kind to which the  Stockholder  is a party or by
which the  Stockholder or any of its  properties or assets may be bound,  or (C)
violate  any order,  written  injunction,  decree,  judgment,  statute,  rule or
regulation applicable to the Stockholder or any of its properties or assets.

         (d) No  Encumbrances.  Except  as  applicable  in  connection  with the
transactions contemplated by Section 3 hereof, the Stockholder's Existing Shares
at  all  times  during  the  term  hereof  will  be  Beneficially  Owned  by the
Stockholder,  free and clear of all liens, claims, security interests,  proxies,
voting  trusts  or  agreements,  understandings  or  arrangements  or any  other
encumbrances whatsoever, except for Existing Shares pledged to the Company.

         (e) No  Solicitation.  The  Stockholder  will not,  and will  cause its
Affiliates  (other  than  the  Company),  and  officers,  directors,  employees,
partners,  investment  bankers,  attorneys,  accountants  and other  agents  and
representatives  of  the  Stockholder  and  such  affiliates  (such  Affiliates,
officers,  directors,   employees,   partners,  investment  bankers,  attorneys,
accountants and other agents and  representatives  of any person are hereinafter
collectively  referred  to as the  
                                       3
<PAGE>
"Representatives"  of such person) not to,  directly or  indirectly  (other than
with Parent and its representatives in connection with the Merger), (i) solicit,
initiate or encourage (including by way of furnishing information) any inquiries
or the making of any proposal with respect to any  Acquisition  Proposal or (ii)
negotiate or otherwise engage in discussions with any Person with respect to any
Acquisition  Proposal, or which may reasonably be expected to lead to a proposal
for an  Acquisition  Proposal,  or enter  into  any  agreement,  arrangement  or
understanding (including any letter of intent, agreement in principle or similar
agreement) with respect to any such Acquisition  Proposal.  The Stockholder will
promptly  advise  Parent of any  inquiries  or  proposals  received  by, and any
information  requested  from, or any  negotiations  or discussions  sought to be
initiated or continued with agents or representatives of the foregoing,  in each
case from a person (other than Parent and its  representatives)  with respect to
an  Acquisition  Proposal,  and a  reasonable  summary  of  the  terms  thereof,
including the identity of such third party,  including any financing arrangement
or commitment in connection therewith.  The Stockholder will, and will cause its
Representatives  to,  immediately  cease and cause to be terminated  any and all
existing  activities,  discussions  or  negotiations,  if any,  with any parties
conducted  heretofore with respect to any Acquisition  Proposal  relating to the
Company, other than discussions or negotiations with Parent and its affiliates.

         (f)  Restriction on Transfer,  Proxies and  Non-Interference.  From the
date hereof through the Termination  Date, the Stockholder will not, directly or
indirectly (i) offer for sale, sell, transfer,  tender, pledge, encumber, assign
or otherwise dispose of, or enter into any contract, option or other arrangement
or  understanding  with  respect  to or  consent  to the offer  for sale,  sale,
transfer, tender, pledge,  encumbrance,  assignment or other disposition of, any
or all of the  Securities  or any  interest  therein,  (ii) grant any proxies or
powers of attorney,  deposit the Securities  into a voting trust or enter into a
voting  agreement with respect to the Securities,  or (iii) take any action that
would make any  representation  or warranty of the Stockholder  contained herein
untrue  or  incorrect  or would  result in a breach  by the  Stockholder  of its
obligations under this Agreement.

         (g) Reliance by Parent.  The Stockholder  understands and  acknowledges
that Parent is entering into the  Amendment in reliance  upon the  Stockholder's
execution and delivery of this Agreement.

         5. Stop Transfer Legend.

         (a) The Stockholder agrees and covenants to Parent that the Stockholder
will  not  request  that  the  Company  register  the  transfer  (book-entry  or
otherwise) of any certificate or uncertificated interest representing any of the
Securities, unless such transfer is made in compliance with this Agreement.

         (b) In the event of a stock dividend or distribution,  or any change in
the  Company  Capital  Stock  by  reason  of  any  stock   dividend,   split-up,
recapitalization,  combination,  exchange  of  shares or the  like,  other  than
pursuant to the Merger,  the terms "Shares" and  "Securities"  will be deemed to
refer to and  include  the shares of Company  Capital  Stock as well as all such
stock dividends and  distributions and any shares into which or for which any or
all of the  Securities 
                                       4
<PAGE>
may be changed or exchanged  and  appropriate  adjustments  shall be made to the
terms and provisions of this Agreement.

         6. Termination. This Agreement will terminate upon the Termination Date
and all further  obligations  (other than obligations under the last sentence of
Section 3 and obligations for breaches  occurring prior to the Termination Date)
shall terminate as of such date. All  obligations of the  Stockholder  hereunder
and for any breach hereof shall terminate at the Effective Time.

         7. Miscellaneous.

         (a) Further  Assurances.  From time to time, at another party's request
and without  further  consideration,  each party hereto will execute and deliver
such  additional  documents  and take all such further  lawful  action as may be
necessary or reasonably desirable to consummate and make effective,  in the most
expeditious manner practicable, the transactions contemplated by this Agreement.

         (b) Entire Agreement.  This Agreement  constitutes the entire agreement
among the parties with respect to the subject  matter hereof and  supersedes all
other prior agreements and  understandings,  both written and oral,  between the
parties with respect to the subject matter hereof.

         (c) Capacity,  Binding  Effect and Certain  Permitted  Activities.  The
Stockholder agrees that this Agreement and the obligations hereunder will attach
to the  Securities  and will be  binding  upon  any  Person  to  which  legal or
Beneficial  Ownership of such Securities shall pass, whether by operation of law
or  otherwise,   including   without   limitation,   any   Stockholder's   legal
representatives  or successors or other transferees (for value or otherwise) and
any other  successors in interest.  Notwithstanding  anything to the contrary in
this Agreement, the Stockholder is signing this Agreement solely in its capacity
as a  stockholder  of the  Company and the  Stockholder  shall not be limited or
otherwise  affected by this  Agreement with respect to any action or inaction of
the Stockholder taken (i) in its capacity as a director,  officer or employee of
the  Company,  (ii) in its  capacity as a director,  officer or employee  of, or
consultant  to, Parent and/or its  subsidiaries  or (iii) in  conjunction  with,
vis-a-vis or in relation to any other stockholder or family member or any entity
(other than, for purposes of this clause (iii), the Company and Parent or any of
their  respective  subsidiaries) as to which such a stockholder or family member
serves as a director,  officer,  trustee, member, partner, or fiduciary or other
similar  position,  or as to which the Stockholder  exercises any dispositive or
voting control of any Securities held by such entity.

         (d) Assignment. Neither this Agreement nor any of the rights, interests
or obligations  hereunder will be assigned or delegated (whether by operation of
law or  otherwise)  without  the prior  written  consent  of the other  parties,
provided that Parent may assign, in its sole discretion,  its rights,  interests
and obligations  hereunder to any direct or indirect wholly owned  subsidiary of
Parent,  but no such  assignment will relieve Parent from any of its obligations
hereunder if such  assignee  does not perform such  obligations.  Subject to the
preceding sentence, this 
                                       5
<PAGE>
Agreement  will be binding upon,  inure to the benefit of and be  enforceable by
the parties and their respective successors and assigns.

         (e)  Amendment  and  Modification.  This  Agreement may not be amended,
changed,  supplemented,  waived or otherwise modified, except upon the execution
and delivery of a written agreement executed by the parties hereto.

         (f) Notices. All notices and other communications  hereunder will be in
writing and will be deemed given if delivered  personally,  on the next business
day after being sent by an overnight  courier service,  such as Federal Express,
or on the second  business day after being sent by registered or certified mail,
return  receipt  requested,  postage  prepaid,  to the parties at the  following
addresses  (or at such other  address for a party as will be  specified  by like
notice):

         If to the  Stockholder to the address set forth for the  Stockholder on
         the signature page to this Agreement

         if to Parent or Merger Sub:

         PLATINUM technology, inc.
         1815 South Meyers Road
         Oak Brook Terrace, Illinois 60181
         Attn:    Andrew J. Filipowski
                  Larry Freedman

         with a copy to:

         Katten Muchin & Zavis
         525 West Monroe Street
         Chicago, Illinois 60661
         Attn:    Matthew S. Brown, Esq.


         (g) Severability.  If any term,  provision,  covenant or restriction of
this Agreement is held by a court of competent  jurisdiction  or other authority
to be  invalid,  void,  unenforceable  or against  its  regulatory  policy,  the
remainder of the terms, provisions, covenants and restrictions of this Agreement
will remain in full force and effect and will in no way be affected, impaired or
invalidated.

         (h) Specific  Performance.  The parties  hereto agree that  irreparable
damage  would  occur  in the  event  any  provision  of this  Agreement  was not
performed  in  accordance  with the terms  hereof and that the  parties  will be
entitled to the remedy of specific  performance of the terms hereof, in addition
to any other remedy at law or equity.

         (i) No Waiver.  The failure of any party  hereto to exercise any right,
power or remedy provided under this Agreement or otherwise  available in respect
hereof at law or in 
                                       6
<PAGE>
equity,  or to  insist  upon  compliance  by any  other  party  hereto  with its
obligations  hereunder,  and any custom or  practice  of the parties at variance
with the terms hereof,  will not  constitute a waiver by such party of its right
to  exercise  any such or  other  right,  power  or  remedy  or to  demand  such
compliance.

         (j) No Third Party  Beneficiaries.  This  Agreement  is not intended to
confer  upon any person  other than the  parties  hereto any rights or  remedies
hereunder.

         (k)  Governing  Law. This  Agreement  will be governed and construed in
accordance with the laws of the State of Delaware,  without giving effect to the
principles of conflict of laws thereof.

         (l)  Jurisdiction.   Each  party  hereby  irrevocably  submits  to  the
exclusive  jurisdiction of the Court of Chancery in the State of Delaware in any
action, suit or proceeding arising in connection with this Agreement, and agrees
that any such action, suit or proceeding will be brought only in such court (and
waives any objection  based on forum non  conveniens  or any other  objection to
venue therein);  provided, however, that no such consent to jurisdiction of said
court or in the State of Delaware  shall be valid other than for such  purposes.
Each party  hereby  waives any right to a trial by jury in  connection  with any
such action, suit or proceeding.

         (m) Description Headings.  The description headings used herein are for
reference  purposes  only  and  will  not  affect  in any  way  the  meaning  or
interpretation of this Agreement.

         (n) Counterparts.  This Agreement may be executed in counterparts, each
of which will be considered one and the same agreement and will become effective
when such  counterparts have been signed by each of the parties and delivered to
the other parties,  it being  understood that all parties need not sign the same
counterpart.

         (o)  Certain  Sales and  Transfers.  Anything  to the  contrary in this
Agreement  notwithstanding,  the Stockholder may (i) sell, transfer or otherwise
dispose of all or any portion of the Parent Common Stock which it may acquire in
the  Merger  or which it may  otherwise  own and (ii)  reorganize  its  internal
structure and  composition  and/or transfer all or any portion of the Securities
which it owns for tax,  securities or estate planning  purposes,  for charitable
donation  purposes or to another  stockholder,  as long as the  recipient of the
voting  and  dispositive  power  with  respect  to such  Securities  under  this
subsection  (ii) agrees to abide by the provisions of and become a party to this
Agreement.

         (p) Option Shares. Nothing contained herein shall require or compel the
Stockholder to exercise any option to purchase shares of Company Capital Stock.
                                       7
<PAGE>
         IN WITNESS WHEREOF,  Parent, Merger Sub and the Stockholder have caused
this Agreement to be duly executed as of the day and year first above written.

                                   PLATINUM technology, inc.


                                   By:
                                       ------------------------------------
                                            Name:
                                            Title:

                                   PT Acquisition Corporation I


                                   By:
                                       ------------------------------------
                                            Name:
                                            Title:


                                   STOCKHOLDER:
                                   ------------


                                   By:
                                       ------------------------------------
                                   Name:
                                        -----------------------------------


                                   Number of Existing Shares:
                                                              -------------

                                   Address:


                                   ----------------------------------------
                                   ----------------------------------------
                                   ----------------------------------------
                                       8


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