SUMMIT DESIGN INC
S-8, 1997-07-31
PREPACKAGED SOFTWARE
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                      SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON D.C. 20549

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

                                   FORM S-8
                            REGISTRATION STATEMENT
                                     UNDER
                          THE SECURITIES ACT OF 1933

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

                               SUMMIT DESIGN, INC.
               (Exact name of Registrant as specified in its charter)


            DELAWARE                                   93-1137888
            --------                                   ----------
  (State or Other Jurisdiction           (I.R.S. Employer Identification Number)
of Incorporation or Organization)

               9305 S. W. GEMINI DRIVE, BEAVERTON, OREGON 97008
                   (Address of Principal Executive Officer)

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

                       TRIQUEST DESIGN AUTOMATION, INC.
                            1995 STOCK OPTION PLAN

                            (Full Title of the Plan)

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

                                LARRY J. GERHARD
                    PRESIDENT AND CHIEF EXECUTIVE OFFICER
                              SUMMIT DESIGN, INC.
                            9305 S. W. GEMINI DRIVE
                            BEAVERTON, OREGON 97008
                                (503) 643-9281
         (Name, address, including zip code, and telephone number,
                  including area code, of agent for service)

                           ------------------------
                                    Copy to:
                             STEVEN V. BERNARD, ESQ.
                       WILSON SONSINI GOODRICH & ROSATI
                           PROFESSIONAL CORPORATION
                               650 PAGE MILL ROAD
                            PALO ALTO, CA 94304-1050


                        CALCULATION OF REGISTRATION FEE
<TABLE>
<CAPTION>
- ----------------------------------------------------------------------------------------------------------------------------
                                                          PROPOSED MAXIMUM
                                          AMOUNT TO BE    OFFERING PRICE PER      PROPOSED MAXIMUM              AMOUNT OF 
  TITLE OF SECURITIES TO BE REGISTERED    REGISTERED(1)         SHARE(2)      AGGREGATE OFFERING PRICE       REGISTRATION FEE
- ----------------------------------------------------------------------------------------------------------------------------
<S>                                        <C>                <C>                    <C>                           <C>
Common Stock, $0.01 par value               196,538            $0.7145                $140,427                      $43

- ----------------------------------------------------------------------------------------------------------------------------
</TABLE>

(1)   Pursuant to the Agreement and Plan of Reorganization dated as of 
February 17, 1997, by and among Summit Design, Inc. (the "Registrant"), NYE 
Acquisition, Inc. and TriQuest Design Automation, Inc., the Registrant 
assumed all of the outstanding options to purchase Common Stock of TriQuest 
under the TriQuest Design Automation, Inc. 1995 Stock Option Plan, and such 
options became exercisable to purchase shares of Registrant's Common Stock, 
with appropriate adjustments to the number of shares and exercise price of 
each assumed option.

(2)   Computed in accordance with Rule 457(h) of the Securities Act of 
1933 solely for the purpose of calculating the filing fee based upon the 
weighted average exercise price of $0.7145 per share.


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<PAGE>

                              SUMMIT DESIGN, INC.

                     REGISTRATION STATEMENT ON FORM S-8

                                    PART II

ITEM 3.  INCORPORATION OF DOCUMENTS BY REFERENCE.

    There are hereby incorporated by reference into this Registration 
Statement the following documents and information heretofore filed with the 
Securities and Exchange Commission (the "Commission") by the Registrant:

    1.  The Registrant's Annual Report on Form 10-K for the fiscal year ended 
        December 31, 1996, filed pursuant to Section 13(a) of the Securities
        Exchange Act of 1934, as amended (the "Exchange Act").

    2.  The Registrant's Current Report on Form 8-K dated February 28, 1997, 
        filed pursuant to Section 13(a) of the Exchange Act.

    3.  The Registrant's Quarterly Report on Form 10-Q for the fiscal quarter 
        ended March 31, 1997, filed pursuant to Section 13(a) of the Exchange
        Act.

    4.  The Registrant's Current Report on Form 8-K dated July 11, 1997, 
        filed pursuant to Section 13(a) of the Exchange Act.

    5.  The description of Registrant's Common Stock contained in the 
        Registrant's Registration Statement on Form 8-A dated October 9, 1996,
        filed pursuant to Section 12(g) of the Exchange Act and declared 
        effective on October 17, 1996, including any amendment or report filed 
        for the purpose of updating such description.

    All documents filed by Registrant pursuant to Sections 13(a), 13(c), 14 
and 15(d) of the Exchange Act after the date hereof, and prior to the filing 
of a post-effective amendment which indicates that all securities offered 
hereunder have been sold or which deregisters all securities then remaining 
unsold under this registration statement, shall be deemed to be incorporated 
by reference herein and to be part hereof from the date of filing of such 
documents.

ITEM 4.  DESCRIPTION OF SECURITIES.

    Not Applicable.

ITEM 5.  INTERESTS OF NAMED EXPERTS AND COUNSEL.

    Not Applicable.

ITEM 6.  INDEMNIFICATION OF DIRECTORS AND OFFICERS.

    The Company's Amended and Restated Certificate of Incorporation limits 
the liability of directors to the maximum extent permitted by Delaware law. 
Delaware law provides that a corporation's certificate of incorporation may 
contain a provision eliminating or limiting the personal liability of a 
director for monetary damages for breach of their fiduciary duties as
directors, except for liability (i) for any breach of their duty of loyalty 
to the corporation or its stockholders, (ii) for acts or omissions not in 
good faith or which involve intentional misconduct or a knowing violation of 
law, (iii) for unlawful payments of dividends or unlawful stock repurchases 
or redemptions as provided in Section 174 of the Delaware General Corporation 
Law or (iv) for any transaction from which the director derived an improper 
personal benefit.


                                      -2-
<PAGE>


    The Company's Amended and Restated Bylaws provide that the Company shall 
indemnify its directors and officers and may indemnify its employees and 
agents to the fullest extent permitted by law. The Company believes that 
indemnification under its Amended and Restated Bylaws covers at least 
negligence and gross negligence on the part of indemnified parties.

    The Company has entered into agreements to indemnify its directors and 
officers in addition to the indemnification provided for in the Company's 
Amended and Restated Bylaws. These agreements, among other things, indemnify 
the Company's directors and officers for certain expenses (including 
attorney's fees), judgments, fines and settlement amounts incurred by any 
such person in any action or proceeding, including any action by or in the 
right of the Company, arising out of such person's services as a director or 
officer of the Company, any subsidiary of the Company or any other company or 
enterprise to which the person provides services at the request of the 
Company.

ITEM 7.    EXEMPTION FROM REGISTRATION CLAIMED.

    Not applicable.

ITEM 8.    INDEX TO EXHIBITS.


<TABLE>
<CAPTION>
   Exhibit 
    Number                 Description of Document
- --------------       -------------------------------------
<S>                 <C>
  4.1                TriQuest Design Automation, Inc. 1995 Stock Option Plan and form of agreement thereto

  5.1                Opinion of Counsel as to legality of securities being registered

 23.1                Consent of Coopers & Lybrand L.L.P.

 23.2                Consent of Counsel (contained in Exhibit 5.1)

 24.1                Power of Attorney (see page 5)

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

</TABLE>

ITEM 9.    UNDERTAKINGS.

    (a)    The undersigned Registrant hereby undertakes:

           (1)  To file, during any period in which offers or sales are being 
made, a post-effective amendment to this registration statement:

                (i)  To include any prospectus required by section 10(a)(3) 
of the Securities Act of 1933.

                (ii)  To reflect in the prospectus any facts or events 
arising after the effective date of the registration statement (or the most 
recent post-effective amendment thereof) which, individually or in the 
aggregate, represent a fundamental change in the information set forth in the 
registration statement; and





                                     -3-
<PAGE>


                (iii)   To include any material information with respect to 
the plan of distribution not previously disclosed in the registration 
statement or any material change to such information in the registration 
statement.

           PROVIDED, HOWEVER, that paragraphs (a)(1)(i) and (a)(1)(ii) do not 
apply if the information required to be included in a post-effective 
amendment by those paragraphs is contained in periodic reports filed by the 
Registrant pursuant to section 13 or section 15(d) of the Securities Exchange 
Act of 1934 that are incorporated by reference in this registration statement.

           (2) That, for the purpose of determining any liability under the 
Securities Act of 1933, each such post-effective amendment shall be deemed to 
be a new registration statement relating to the securities offered therein, 
and the offering of such securities at that time shall be deemed to be the 
initial bona fide offering thereof.

           (3) To remove from registration by means of a post-effective 
amendment any of the securities being registered which remain unsold at the 
termination of the offering.

    (b) The undersigned Registrant hereby undertakes that, for purposes of 
determining any liability under the Securities Act of 1933, each filing of 
the Registrant's annual report pursuant to section 13(a) or section 15(d) of 
the Securities Exchange Act of 1934 (and, where applicable, each filing of an 
employee benefit plan's annual report pursuant to section 15(d) of the 
Securities Exchange Act of 1934) that is incorporated by reference in the 
registration statement shall be deemed to be a new registration statement 
relating to the securities offered therein, and the offering of such 
securities at that time shall be deemed to be the initial bona fide offering 
thereof.

    (c) Insofar as indemnification for liabilities arising under the 
Securities Act of 1933 may be permitted to directors, officers and 
controlling persons of the Registrant pursuant to the foregoing provisions, 
or otherwise, the Registrant has been advised that in the opinion of the 
Securities and Exchange Commission such indemnification is against public 
policy as expressed in the Act and is, therefore, unenforceable. In the event 
that a claim for indemnification against such liabilities (other than the 
payment by the Registrant of expenses incurred or paid by a director, officer 
or controlling person of the Registrant in the successful defense of any 
action, suit or proceeding) is asserted by such director, officer or 
controlling person in connection with the securities being registered, the 
Registrant will, unless in the opinion of its counsel the matter has been 
settled  by controlling precedent, submit to a court of appropriate 
jurisdiction the question whether such indemnification by it is against public
policy as expressed in the Securities Act of 1933 and will be governed by the 
final adjudication of such issue.



                                      -4-
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                                  SIGNATURES

     Pursuant to the requirements of the Securities Act of 1933, the 
Registrant certifies that it has reasonable grounds to believe that it meets 
all of the requirements for filing on Form S-8 and has duly caused this 
Registration Statement to be signed on its behalf by the undersigned, 
thereunto duly authorized, in the City of Beaverton, State of Oregon on this 
31st day of July 1997.


                                  SUMMIT DESIGN, INC.

                                  By:   /s/ Larry J. Gerhard
                                        ----------------------------
                                        Larry J. Gerhard
                                        President and Chief Executive Officer


                               POWER OF ATTORNEY

     KNOW ALL PERSONS BY THESE PRESENTS, that each of the undersigned hereby 
constitutes and appoints, jointly and severally, Larry J. Gerhard and C. 
Albert Koob, or any of them (with full power to each of them to act alone), 
as his true and lawful attorneys-in-fact and agents, each with full power of 
substitution and resubstitution, for him and on his behalf to sign, execute 
and file this Registration Statement and any or all amendments (including, 
without limitation, post-effective amendments) to this Registration 
Statement, and to file the same, with all exhibits thereto and any all 
documents required to be filed with respect therewith, with the Securities 
and Exchange Commission or any regulatory authority, granting unto such 
attorneys-in-fact and agents, and each of them, full power and authority to 
do and perform each and every act and thing requisite and necessary to be 
done in connection therewith and about the premises in order to effectuate the 
same as fully to all intents and purposes as he might or could do if 
personally present, hereby ratifying and confirming all that such 
attorneys-in-fact and agents, or any of them, or his or their substitute or 
substitutes, may lawfully do or cause to be done.

     Pursuant to the requirements of the Securities Act of 1933, this 
Registration Statement has been signed by the following persons in the 
capacities and on the dates indicated.


<TABLE>
<CAPTION>
           Signatures                      Title                                  Date
- ----------------------------   -------------------------------------   --------------------------
<S>                            <C>                                           <C>
/s/ Larry J. Gerhard           Chairman of the Board, President and          July 31, 1997
- ----------------------------   Chief Executive Officer (Principal
Larry J. Gerhard               Executive Officer)

/s/ C. Albert Koob             Vice President - Finance, Chief               July 31, 1997
- ----------------------------   Financial Officer and Secretary
C. Albert Koob                 (Principal Financial and Accounting
                               Officer)

/s/ Amihai Ben-David           Director                                      July 31, 1997
- ----------------------------
Amihai Ben-David

/s/ William V. Botts           Director                                      July 31, 1997
- ----------------------------
William V. Botts

/s/ Steven P. Erwin            Director                                      July 31, 1997
- ----------------------------
Steven P. Erwin

/s/ Barbara M. Karmel          Director                                      July 31, 1997
- ----------------------------
Barbara M. Karmel

</TABLE>



                                       5
<PAGE>

                               INDEX TO EXHIBITS

<TABLE>
<CAPTION>

 Exhibit
 Number                     Description of Document
- ---------   -------------------------------------------------------------------------------------
  <S>       <C>
   4.1      TriQuest Design Automation, Inc. 1995 Stock Option Plan and form of agreement thereto

   5.1      Opinion of Counsel as to legality of securities being registered

  23.1      Consent of Coopers & Lybrand L.L.P

  23.2      Consent of Counsel (contained in Exhibit 5.1)

  24.1      Power of Attorney (see page 5)

- -------------------
</TABLE>








                                       6

<PAGE>

                                                                  Exh. 4.1



                  TRIQUEST DESIGN AUTOMATION, INC.
                                  
                       1995 STOCK OPTION PLAN
                                  
       As Adopted April 17, 1995 and Amended February 27, 1996
                                  

    1.   PURPOSE.  The purpose of the Plan is to provide incentives to attract,
retain and motivate eligible persons whose present and potential contributions
are important to the success of the Company, its Parent, Subsidiaries and
Affiliates, by offering them an opportunity to participate in the Company's
future performance through awards of stock options.  Capitalized terms not
defined in the text are defined in Section 21.

    2.   SHARES SUBJECT TO THE PLAN.

         2.1  NUMBER OF SHARES AVAILABLE.  Subject to Sections 2.2 and 16, the
total number of Shares reserved and available for grant and issuance pursuant to
Awards under the Plan shall be 5,907,031.  Subject to Sections 2.2 and 16,
Shares shall again be available for grant and issuance in connection with future
Awards under the Plan if such Shares cease to be subject to an Award.

         2.2  ADJUSTMENT OF SHARES.  In the event that the number of
outstanding Shares is changed by a stock dividend, recapitalization, stock
split, reverse stock split, subdivision, combination, reclassification or
similar change in the capital structure of the Company without consideration, or
by a Corporate Transaction (as defined in Section 16.1) then, unless such change
results in the termination of all outstanding Awards as a result of the
Corporate Transaction, (a) the number of Shares reserved for issuance under the
Plan and (b) the Exercise Prices of and number of Shares subject to outstanding
Awards shall be proportionately adjusted, subject to any required action by the
Board or the shareholders of the Company and compliance with applicable
securities laws; PROVIDED, HOWEVER, that fractions of a Share shall not be
issued but shall either be paid in cash at Fair Market Value or shall be rounded
up to the nearest Share, as determined by the Committee.

    3.   ELIGIBILITY.  ISOs (as defined in Section 5 below) may be granted only
to employees (including officers and directors who are also employees) of the
Company or of a Parent or Subsidiary of the Company.  NQSOs (as defined in
Section 5 below) may be granted to employees, officers, directors, consultants,
independent contractors and advisors of the Company or any Parent, Subsidiary or
Affiliate of the Company; PROVIDED such consultants, independent contractors and
advisors render bona fide services not in connection with the offer and sale of
securities in a capital-raising transaction.  A person may be granted more than
one Award under the Plan.


<PAGE>

4.  ADMINISTRATION.

         4.1  COMMITTEE AUTHORITY.  The Plan shall be administered by the
Committee.  Subject to the general purposes, terms and conditions of the Plan,
the Committee shall have full power to implement and carry out the Plan.  The
Committee shall have the authority to:

         (a)  construe and interpret the Plan, any Stock Option Agreement and
              any other agreement or document executed pursuant to the Plan; 

         (b)  prescribe, amend and rescind rules and regulations relating to
              the Plan; 

         (c)  select persons to receive Awards;

         (d)  determine the form and terms of Awards;

         (e)  determine the number of Shares subject to Awards;

         (f)  determine whether Awards will be granted in replacement of, or 
              as alternatives to, other Awards under the Plan or any other 
              incentive or compensation plan of the Company or any Parent, 
              Subsidiary or Affiliate of the Company;

         (g)  grant waivers of Plan or Award conditions;

         (h)  determine the vesting and exercisability of Awards;

         (i)  correct any defect, supply any omission, or reconcile any
              inconsistency in the Plan, any Award or any Stock Option
              Agreement;

         (j)  determine the disposition of Awards in the event of a
              Participant's divorce or dissolution of marriage; and

         (k)  make all other determinations necessary or advisable for the
              administration of the Plan.

                                       2
<PAGE>

         4.2  COMMITTEE DISCRETION.  Any determination made by the Committee
with respect to any Award shall be made in its sole discretion at the time of
grant of the Award or, unless in contravention of any express term of the Plan
or Award, at any later time, and such determination shall be final and binding
on the Company and all persons having an interest in any Award under the Plan. 
The Committee may delegate to one or more officers of the Company the authority
to grant an Award under the Plan to Participants who are not Insiders of the
Company.

         4.3  EXCHANGE ACT REQUIREMENTS.  If the Company is subject to the
Exchange Act, the Company will take appropriate steps to comply with the
disinterested director requirements of Section 16(b) of the Exchange Act,
including but not limited to, the appointment by the Board of a Committee
consisting of not less than two persons (who are members of the Board), each of
whom is a Disinterested Person.

    5.   STOCK OPTIONS.  The Committee may grant Awards to eligible persons and
shall determine whether such Awards shall be Incentive Stock Options within the
meaning of the Code ("ISOs") or Nonqualified Stock Options ("NQSOs"), the number
of Shares subject to the Award, the Exercise Price of the Award, the period
during which the Award may be exercised, and all other terms and conditions of
the Award, subject to the following:

         5.1  FORM OF OPTION GRANT.  Each Award granted under the Plan shall be
evidenced by a Stock Option Agreement which shall expressly identify the Award
as an ISO or NQSO, and be in such form and contain such provisions (which need
not be the same for each Participant) as the Committee shall from time to time
approve, and which shall comply with and be subject to the terms and conditions
of the Plan.

         5.2  DATE OF GRANT.  The date of grant of an Award shall be the date
on which the Committee makes the determination to grant such Award, unless
otherwise specified by the Committee.  The Stock Option Agreement and a copy of
the Plan will be delivered to the Participant within a reasonable time after the
granting of the Award.

         5.3  EXERCISE PERIOD.  Awards shall be exercisable within the times or
upon the events determined by the Committee as set forth in the Stock Option
Agreement; PROVIDED, HOWEVER, that no Award shall be exercisable after the
expiration of ten (10) years from the date the Award is granted; and provided
further that no ISO granted to a person who directly or by attribution owns more
than ten percent (10%) of the total combined voting power of all classes of
stock of the Company or any Parent or Subsidiary of the Company
("TEN PERCENT SHAREHOLDER") shall be exercisable after the expiration of five
(5) years from the date the Award is granted.  The Committee 

                                       3

<PAGE>

also may provide for the exercise of Awards to become exercisable at one time 
or from time to time, periodically or otherwise, in such number or percentage 
as the Committee determines.

         5.4  EXERCISE PRICE.  The Exercise Price shall be determined by the
Committee when the Award is granted and shall be not less than 100% of the Fair
Market Value of the Shares on the date of grant for ISO's and 85% of Fair Market
Value of the Shares on the date of grant on NQSO's; provided that the Exercise
Price of any ISO granted to a Ten Percent Shareholder shall not be less than
110% of the Fair Market Value of the Shares on the date of grant.  Payment for
the Shares purchased may be made in accordance with Section 6 of the Plan.

         5.5  METHOD OF EXERCISE.  Awards may be exercised only by delivery to
the Company of a written exercise agreement (the "EXERCISE AGREEMENT") in a form
approved by the Committee (which need not be the same for each Participant),
stating the number of Shares being purchased, the restrictions imposed on the
Shares, if any, and such representations and agreements regarding Participant's
investment intent and access to information and other matters, if any, as may be
required or desirable by the Company to comply with applicable securities laws,
together with payment in full of the Exercise Price for the number of Shares
being purchased.

         5.6  TERMINATION.  Notwithstanding the exercise periods set forth in
the Stock Option Agreement, exercise of an Award shall always be subject to the
following:

         (a)  If the Participant is Terminated for any reason except death or 
              Disability, then Participant may exercise such Participant's 
              Awards only to the extent that such Awards would have been 
              exercisable upon the Termination Date no later than three (3) 
              months after the Termination Date (or such longer time period not
              exceeding five  years as may be determined by the Committee), 
              but in any event, no later than the expiration date of the Awards.

         (b)  If the Participant is terminated because of death or Disability 
              (or the Participant dies within three months of such termination),
              then Participant's Awards would have been exercisable by 
              Participant on the Termination Date and must be exercised by 
              Participant (or  Participant's legal representative or authorized
              assignee) no later than (i) twelve (12) months after the 
              Termination Date in the case of disability or (ii) eighteen (18)
              months after the Termination Date in the case of death (or such 
              longer time period not exceeding five 

                                       4

<PAGE>

              years as may be determined by the Committee), but in any event 
              no later than the expiration date of the Awards.

         5.7  LIMITATIONS ON EXERCISE.  The Committee may specify a reasonable
minimum number of Shares that may be purchased on any exercise of an Award;
provided that such minimum number will not prevent Participant from exercising
the Award for the full number of Shares for which it is then exercisable.

         5.8  LIMITATIONS ON ISOs.  The aggregate Fair Market Value 
(determined as of the date of grant) of Shares with respect to which ISOs are 
exercisable for the first time by a Participant during any calendar year 
(under the Plan or under any other incentive stock option plan of the Company 
or any Affiliate, Parent or Subsidiary of the Company) shall not exceed 
$100,000.  If the Fair Market Value of Shares on the date of grant with 
respect to which ISOs are exercisable for the first time by a Participant 
during any calendar year exceeds $100,000, the Awards for the first $100,000 
worth of Shares to become exercisable in such calendar year shall be ISOs and 
the Awards for the amount in excess of $100,000 that become exercisable in 
that calendar year shall be NQSOs. In the event that the Code or the 
regulations promulgated thereunder are amended after the Effective Date of 
the Plan to provide for a different limit on the Fair Market Value of Shares 
permitted to be subject to ISOs, such different limit shall be automatically 
incorporated herein and shall apply to any Awards granted after the effective 
date of such amendment.

          5.9  MODIFICATION, EXTENSION OR RENEWAL.  The Committee may modify,
extend or renew outstanding Awards and authorize the grant of new Awards in
substitution therefor; provided that any such action may not, without the
written consent of Participant, impair any of Participant's rights under any
Award previously granted.  Any outstanding ISO that is modified, extended,
renewed or otherwise altered shall be treated in accordance with Section 424(h)
of the Code.  The Committee may reduce the Exercise Price of outstanding Awards
without the consent of Participants affected by a written notice to them;
PROVIDED, HOWEVER, that the Exercise Price may not be reduced below the minimum
Exercise Price that would be permitted under Section 5.4 of the Plan for Awards
granted on the date the action is taken to reduce the Exercise Price.

         5.10  NO DISQUALIFICATION.  Notwithstanding any other provision in the
Plan, no term of the Plan relating to ISOs shall be interpreted, amended or
altered, nor shall any discretion or authority granted under the Plan be
exercised, so as to disqualify the Plan under Section 422 of the Code or,
without the consent of the Participant affected, to disqualify any ISO under
Section 422 of the Code.

                                       5

<PAGE>

    6.   PAYMENT FOR SHARE PURCHASES.  

         6.1  PAYMENT.  Payment for Shares purchased pursuant to the Plan may
be made in cash (by check) or, where expressly approved for the Participant by
the Committee and where permitted by law:

         (a)  by cancellation of indebtedness of the Company to the
              Participant;

         (b)  by surrender of Shares that either: (1) have been owned by
              Participant for more than six (6) months and have been paid 
              for within the meaning of SEC Rule 144 (and, if such shares were
              purchased from the Company by use of a promissory note, such note
              has been fully paid with respect to such Shares); or (2) were
              obtained by Participant in the public market;

         (c)  by tender of a full recourse promissory note having such terms as
              may be approved by the Committee and bearing interest at a rate
              sufficient to avoid imputation of income under Sections 483 and
              1274 of the Code; PROVIDED, HOWEVER, that Participants who are not
              employees of the Company shall not be entitled to purchase Shares
              with a promissory note unless the note is adequately secured by 
              collateral other than the Shares;

         (d)  by waiver of compensation due or accrued to Participant for 
              services rendered;

         (e)  by tender of property;

         (f)  with respect only to purchases upon exercise of an Award, and
              provided that a public market for the Company's stock exists:

                      (1)  through a "same day sale" commitment from    
                           Participant and a broker-dealer that is a member of
                           the National Association of Securities Dealers 
                           (a "NASD DEALER") whereby the Participant irrevocably
                           elects to exercise the Award and to sell a portion of
                           the Shares so purchased in order to pay for the
                           Exercise Price, and whereby the NASD 

                                       6

<PAGE>

                           Dealer irrevocably commits upon receipt of such 
                           Shares to forward the Exercise Price directly to the
                           Company; or

                      (2)  through a "margin" commitment from Participant and a
                           NASD Dealer whereby Participant irrevocably elects to
                           exercise the Award and to pledge the Shares so 
                           purchased to the NASD Dealer in a margin account as
                           security for a loan from the NASD Dealer in the
                           amount of the Exercise Price, and whereby the NASD 
                           Dealer irrevocably commits upon receipt of such 
                           Shares to forward the exercise price directly to the
                           Company; or

         (g)  by any combination of the foregoing.

         6.2  LOAN GUARANTEES.  The Committee may help the Participant pay for
Shares purchased under the Plan by authorizing a guarantee by the Company of a
third-party loan to the Participant.

    7.   WITHHOLDING TAXES.

         7.1  WITHHOLDING GENERALLY.  Whenever Shares are to be issued in
satisfaction of Awards granted under the Plan, the Company may require the
Participant to remit to the Company an amount sufficient to satisfy federal,
state and local withholding tax requirements prior to the delivery of any
certificate or certificates for such Shares.  Whenever, under the Plan, payments
in satisfaction of Awards are to be made in cash, such payment shall be net of
an amount sufficient to satisfy federal, state, and local withholding tax
requirements.

         7.2  STOCK WITHHOLDING.  When, under applicable tax laws, a
Participant incurs tax liability in connection with the exercise or vesting of
any Award that is subject to tax withholding and the Participant is obligated to
pay the Company the amount required to be withheld, the Committee may allow the
Participant to satisfy the minimum withholding tax obligation by electing to
have the Company withhold from the Shares to be issued that number of Shares
having a Fair Market Value equal to the minimum amount required to be withheld,
determined on the date that the amount of tax to be withheld is to be determined
(the "TAX DATE").  All elections by a Participant 

                                       7

<PAGE>

to have Shares withheld for this purpose shall be made in writing in a form 
acceptable to the Committee and shall be subject to the following restrictions:

         (a)  the election must be made on or prior to the applicable Tax Date;

         (b)  once made, then except as provided below, the election shall be
              irrevocable as to the particular Shares as to which the election
              is   made;

         (c)  all elections shall be subject to the consent or disapproval of
              the Committee;

         (d)  if the Participant is an Insider and if the Company is subject to
              Section 16(b) of the Exchange Act:  (1) the election may not be
              made within six (6) months of the date of grant of the Award,
              except as otherwise permitted by SEC Rule 16b-3(e) under the
              Exchange Act, and (2) either (A) the election to use stock 
              withholding must be irrevocably made at least six (6) months prior
              to the Tax Date (although such election may be revoked at any
              time at least six (6) months prior to the Tax Date) or (B) the
              exercise of the Award or election to use stock withholding must
              be made in the ten (10) day period beginning on the third day
              following the release of the Company's quarterly or annual
              summary statement of sales or earnings; and 

         (e)  in the event that the Tax Date is deferred until six (6) months
              after the delivery of Shares under Section 83(b) of the Code, the
              Participant shall receive the full number of Shares with respect
              to which the exercise occurs, but such Participant shall be 
              unconditionally obligated to tender back to the Company the 
              proper number of Shares on the Tax Date.

    8.   PRIVILEGES OF STOCK OWNERSHIP.

         8.1  PAYMENT.  Payment for Shares purchased pursuant to the Plan may
be made in cash (by check) or, where expressly approved for the Participant by
the Committee and where permitted by law.

                                       8

<PAGE>

         8.2  VOTING AND DIVIDENDS.  No Participant shall have any of the
rights of a shareholder with respect to any Shares until the Shares are issued
to the Participant.  After Shares are issued to the Participant, the Participant
shall be a shareholder and have all the rights of a shareholder with respect to
such Shares, including the right to vote and receive all dividends or other
distributions made or paid with respect to such Shares.

         8.3  FINANCIAL STATEMENTS.  The Company shall provide financial
statements to each Participant prior to such Participant's purchase of Shares
under the Plan, and to each Participant annually during the period such
Participant has Awards outstanding; PROVIDED, HOWEVER, the Company shall not be
required to provide such financial statements to Participants whose services in
connection with the Company assure them access to equivalent information.

    9.   TRANSFERABILITY.  Subject to Section 4.1(j), Awards granted under the
Plan, and any interest therein, shall not:  (a) be transferable or assignable by
the Participant, (b) be made subject to execution, attachment or similar
process, otherwise than by will or by the laws of descent and distribution or as
consistent with the specific Plan and Stock Option Agreement provisions relating
thereto or (c) during the lifetime of the Participant, be exercisable  by anyone
other than the Participant, and any elections with respect to an Award, may be
made only by the Participant.

    10.  RESTRICTIONS ON SHARES.  At the discretion of the Committee, the
Company may reserve to itself and/or its assignee(s) in the Stock Option
Agreement (a) a right of first refusal to purchase all Shares that a Participant
(or a subsequent transferee) may propose to transfer to a third party, and/or
(b) a right to repurchase all Shares held by a Participant following such
Participant's Termination at any time within ninety (90) days after the later of
Participant's Termination Date and the date Participant purchases Shares under
the Plan, for cash or cancellation of purchase money indebtedness, at:  (A) with
respect to Shares that are "Vested" (as defined in the Stock Option Agreement),
the higher of:  (l) Participant's original Purchase Price, or (2) the Fair
Market Value of such Shares on Participant's Termination Date, PROVIDED, such
right of repurchase terminates when the Company's securities become publicly
traded; or (B) with respect to Shares that are not "Vested" (as defined in the
Stock Option Agreement), at the Participant's original Purchase Price, PROVIDED,
that the right to repurchase at the original Purchase Price lapses at the rate
of at least 20% per year over 5 years from the date the Shares were purchased,
and if the right to repurchase is assignable, the assignee must pay the Company,
upon assignment of the right to repurchase, cash equal to the excess of the Fair
Market Value of the Shares over the original Purchase Price.

    11.  CERTIFICATES.  All certificates for Shares or other securities
delivered under the Plan shall be subject to such stock transfer orders, legends
and other restrictions as the Committee 

                                       9

<PAGE>

may deem necessary or advisable, including restrictions under any applicable 
federal, state or foreign securities law, or any rules, regulations and other 
requirements of the SEC or any stock exchange or automated quotation system 
upon which the Shares may be listed.

    12.  ESCROW; PLEDGE OF SHARES.  To enforce any restrictions on a 
Participant's Shares, the Committee may require the Participant to deposit 
all certificates representing Shares, together with stock powers or other 
instruments of transfer approved by the Committee, appropriately endorsed in 
blank, with the Company or an agent designated by the Company to hold in 
escrow until such restrictions have lapsed or terminated, and the Committee 
may cause a legend or legends referencing such restrictions to be placed on 
the certificates.  Any Participant who is permitted to execute a promissory 
note as partial or full consideration for the purchase of Shares under the 
Plan shall be required to pledge and deposit with the Company all or part of 
the Shares so purchased as collateral to secure the payment of Participant's 
obligation to the Company under the promissory note; PROVIDED, HOWEVER, that 
the Committee may require or accept other or additional forms of collateral 
to secure the payment of such obligation and, in any event, the Company shall 
have full recourse against the Participant under the promissory note 
notwithstanding any pledge of the Participant's Shares or other collateral.  
In connection with any pledge of the Shares, Participant shall be required to 
execute and deliver a written pledge agreement in such form as the Committee 
shall from time to time approve. The Shares purchased with the promissory 
note may be released from the pledge on a prorata basis as the promissory 
note is paid.

    13.  SECURITIES LAW AND OTHER REGULATORY COMPLIANCE.  An Award shall not 
be effective unless such Award is in compliance with all applicable federal 
and state securities laws, rules and regulations of any governmental body, 
and the requirements of any stock exchange or automated quotation system upon 
which the Shares may then be listed, as they are in effect on the date of 
grant of the Award and also on the date of exercise or other issuance.  
Notwithstanding any other provision in the Plan, the Company shall have no 
obligation to issue or deliver certificates for Shares under the Plan prior 
to (a) obtaining any approvals from governmental agencies that the Company 
determines are necessary or advisable, and/or (b) completion of any 
registration or other qualification of such shares under any state or federal 
law or ruling of any governmental body that the Company determines to be 
necessary or advisable.  The Company shall be under no obligation to register 
the Shares with the SEC or to effect compliance with the registration, 
qualification or listing requirements of any state securities laws, stock 
exchange or automated quotation system, and the Company shall have no 
liability for any inability or failure to do so.

    14.  NO OBLIGATION TO EMPLOY.  Nothing in the Plan or any Award granted
under the Plan shall confer or be deemed to confer on any Participant any right
to continue in the employ of, or to continue any other relationship with, the
Company or any Parent, Subsidiary or

                                       10

<PAGE> 

Affiliate of the Company or limit in any way the right of the Company
or any Parent, Subsidiary or Affiliate of the Company to terminate
Participant's employment or other relationship at any time, with or without
cause.

    15.  EXCHANGE AND BUYOUT OF AWARDS.  The Committee may, at any time or 
from time to time, authorize the Company, with the consent of the respective 
Participants, to issue new Awards in exchange for the surrender and 
cancellation of any or all outstanding Awards.  The Committee may at any time 
buy from a Participant an Award previously granted with payment in cash, 
Shares or other consideration, based on such terms and conditions as the 
Committee and the Participant shall agree.

    16.  CORPORATE TRANSACTIONS.

         16.1 ASSUMPTION OR REPLACEMENT OF AWARDS BY SUCCESSOR.  In the event 
of (a) a merger or consolidation in which the Company is not the surviving 
corporation (other than a merger or consolidation with a wholly-owned 
subsidiary, a reincorporation of the Company in a different jurisdiction, or 
other transaction in which there is no substantial change in the shareholders 
of the Company and the Awards granted under the Plan are assumed or replaced 
by the successor corporation, which assumption shall be binding on all 
Participants), (b) a dissolution or liquidation of the Company, (c) the sale 
of substantially all of the assets of the Company, or (d) any other 
transaction which qualifies as a "corporate transaction" under Section 424(a) 
of the Code wherein the shareholders of the Company give up all of their 
equity interest in the Company (EXCEPT for the acquisition, sale or transfer 
of all or substantially all of the outstanding shares of the Company), any or 
all outstanding Awards may be assumed or replaced by the successor 
corporation (if any), which assumption or replacement shall be binding on all 
Participants.  In the alternative, the successor corporation may substitute 
equivalent Awards or provide substantially similar consideration to 
Participants as was provided to shareholders (after taking into account the 
existing provisions of the Awards).  The successor corporation may also 
issue, in place of outstanding Shares of the Company held by the Participant, 
substantially similar shares or other property subject to repurchase 
restrictions no less favorable to the Participant.

         In the event such successor corporation (if any) refuses to assume or
substitute Awards, as provided above, pursuant to a transaction described in
this Subsection 16.1, such Awards shall expire on such transaction at such time
and on such conditions as the Board shall determine.

         16.2 OTHER TREATMENT OF AWARDS.  Subject to any greater rights granted
to Participants under the foregoing provisions of this Section 16, in the event
of the occurrence of any transaction described in Section 16.1, any outstanding
Awards shall be treated as provided in the 

                                       11

<PAGE>

applicable agreement or plan of merger, consolidation, dissolution, 
liquidation, sale of assets or other "corporate transaction."

         16.3 ASSUMPTION OF AWARDS BY THE COMPANY.  The Company, from time to 
time, also may substitute or assume outstanding awards granted by another 
company, whether in connection with an acquisition of such other company or 
otherwise, by either (a) granting an Award under the Plan in substitution of 
such other company's award, or (b) assuming such award as if it had been 
granted under the Plan if the terms of such assumed award could be applied to 
an Award granted under the Plan.  Such substitution or assumption shall be 
permissible if the holder of the substituted or assumed award would have been 
eligible to be granted an Award under the Plan if the other company had 
applied the rules of the Plan to such grant.  In the event the Company 
assumes an award granted by another company, the terms and conditions of such 
award shall remain unchanged (EXCEPT that the exercise price and the number 
and nature of Shares issuable upon exercise of any such option will be 
adjusted appropriately pursuant to Section 424(a) of the Code).  In the event 
the Company elects to grant a new Award rather than assuming an existing 
option, such new Award may be granted with a similarly adjusted Exercise 
Price.

    17.  ADOPTION AND SHAREHOLDER APPROVAL.  The Plan shall become effective 
on the date that it is adopted by the Board (the "EFFECTIVE DATE").  The Plan 
shall be approved by the shareholders of the Company (excluding Shares issued 
pursuant to this Plan), consistent with applicable laws, within twelve months 
before or after the Effective Date.  Upon the Effective Date, the Board may 
grant Awards pursuant to the Plan; PROVIDED, HOWEVER, that: (a) no Award may 
be exercised prior to initial shareholder approval of the Plan, and (b) no 
Award granted pursuant to an increase in the number of Shares approved by the 
Board shall be exercised prior to the time such increase has been approved by 
the shareholders of the Company.  For so long as and whenever the Company is 
subject to Section 16(b) of the Exchange Act, the Company will comply with 
the requirements of Rule 16b-3 (or its successor), as amended, with respect 
to shareholder approval.

    18.  TERM OF PLAN.  The Plan will terminate ten (10) years from the 
Effective Date or, if earlier, the date of shareholder approval.

    19.  AMENDMENT OR TERMINATION OF PLAN.  The Board may at any time terminate
or amend the Plan in any respect, including without limitation amendment of any
form of Stock Option Agreement or instrument to be executed pursuant to the
Plan; PROVIDED, HOWEVER, that the Board shall not, without the approval of the
shareholders of the Company, amend the Plan in any manner that requires such
shareholder approval pursuant to the Code or the regulations promulgated
thereunder as such provisions apply to ISO plans or pursuant to the Exchange Act

                                       12

<PAGE>

or Rule 16b-3 (or its successor), as amended, thereunder; provided further, 
that no amendment may be made to outstanding Awards without the consent of 
the Participant.  

    20.  NONEXCLUSIVITY OF THE PLAN.  Neither the adoption of the Plan by the 
Board, the submission of the Plan to the shareholders of the Company for 
approval, nor any provision of the Plan shall be construed as creating any 
limitations on the power of the Board to adopt such additional compensation 
arrangements as it may deem desirable, including, without limitation, the 
granting of stock options otherwise than under the Plan, and such 
arrangements may be either generally applicable or applicable only in 
specific cases.

    21.  DEFINITIONS.  As used in the Plan, the following terms shall have 
the following meanings:

         "AFFILIATE" means any corporation that directly, or indirectly 
through one or more intermediaries, controls or is controlled by, or is under 
common control with the Company where "control" (including the terms 
"controlled by" and "under common control with") means the possession, direct 
or indirect, of the power to cause the direction of the management and 
policies of the corporation, whether through the ownership of voting 
securities, by contract or otherwise.

         "AWARD" means an award of an option to purchase Shares.

         "STOCK OPTION AGREEMENT" means, with respect to each Award, the signed
written agreement between the Company and the Participant setting forth the
terms and conditions of the Award.

         "BOARD" means the Board of Directors of the Company.

         "CODE" means the Internal Revenue Code of 1986, as amended.

         "COMMITTEE" means the committee appointed by the Board to administer
the Plan, or if no committee is appointed, the Board.

         "COMPANY" means TriQuest Design Automation, Inc., a corporation
organized under the laws of the State of California, or any successor
corporation.

         "DISABILITY" means a disability, whether temporary or permanent,
partial or total, within the meaning of Section 22(e)(3) of the Code, as
determined by the Committee.

                                       13

<PAGE>

         "DISINTERESTED PERSON" means a director who has not, during the 
period that person is a member of the Committee and for one year prior to 
service as a member of the Committee, been granted or awarded equity 
securities pursuant to the Plan or any other plan of the Company or any 
Parent, Subsidiary or Affiliate of the Company, except in accordance with the 
requirements set forth in Rules as promulgated by the SEC under Section 16(b) 
of the Exchange Act, as such Rules are amended from time to time and as 
interpreted by the SEC.

         "EXCHANGE ACT" means the Securities Exchange Act of 1934, as amended.

         "EXERCISE PRICE" means the price at which a holder of an Award may 
purchase the Shares issuable upon exercise of the Award.

         "FAIR MARKET VALUE" means, the value of a share of the Company's 
Common Stock determined as follows:

         (a)  if such Common Stock is then quoted on the Nasdaq National Market
              the closing price on the Nasdaq National Market on the trading day
              immediately preceding the date on which Fair Market Value is 
              determined, or, if no such reported sale takes place on such date,
              the closing price on the next preceding trading date on which a 
              reported sale occurred;

         (b)  if such Common Stock is publicly traded and is then listed on a
              national securities exchange, the closing price or, if no 
              reported sale takes place on such date, the closing price on 
              the next preceding trading day on which a reported sale occurred;

         (c)  if such Common Stock is publicly traded but is not quoted on the 
              Nasdaq National Market nor listed or admitted to trading on a 
              national securities exchange, the average of the closing bid and
              asked prices on such date, as reported by The Wall Street Journal,
              for the over-the-counter market; or

         (d)  if none of the foregoing is applicable, by the Board in good
              faith.

         "INSIDER" means an officer or director of the Company or any other
person whose transactions in the Company's Common Stock are subject to Section
16 of the Exchange Act.

                                       14

<PAGE>


         "PARENT" means any corporation (other than the Company) in an 
unbroken chain of corporations ending with the Company, if at the time of the 
granting of an Award under the Plan, each of such corporations other than the 
Company owns stock possessing 50% or more of the total combined voting power 
of all classes of stock in one of the other corporations in such chain.

         "PARTICIPANT" means a person who receives an Award under the Plan.

         "PLAN" means this TriQuest Design Automation, Inc. 1995 Stock Option 
Plan, as amended from time-to-time.

         "SEC" means the Securities and Exchange Commission.

         "SECURITIES ACT" means the Securities Act of 1933, as amended.

         "SHARES" means shares of the Company's Common Stock reserved for 
issuance under the Plan, as adjusted pursuant to Sections 2 and 16, and any 
successor security.

         "SUBSIDIARY" means any corporation (other than the Company) in an 
unbroken chain of corporations beginning with the Company if, at the time of 
granting of the Award, each of the corporations other than the last 
corporation in the unbroken chain owns stock possessing 50% or more of the 
total combined voting power of all classes of stock in one of the other 
corporations in such chain.

         "TERMINATION" or "TERMINATED" means, for purposes of the Plan with 
respect to a Participant, that the Participant has ceased to provide services 
as an employee, director, consultant, independent contractor or advisor, to 
the Company or a Parent, Subsidiary or Affiliate of the Company, except in 
the case of sick leave, military leave, or any other leave of absence 
approved by the Committee, PROVIDED, that such leave is for a period of not 
more than ninety (90) days, or reinstatement upon the expiration of such 
leave is guaranteed by contract or statute.  The Committee shall have sole 
discretion to determine whether a Participant has ceased to provide services 
and the effective date on which the Participant ceased to provide services 
(the "TERMINATION DATE").

                                       15
<PAGE>

                       TRIQUEST DESIGN AUTOMATION, INC.
                                  
                            1995 STOCK OPTION PLAN
                                  
                            STOCK OPTION AGREEMENT
                                  

    This Stock Option Agreement ("AGREEMENT") is made and entered into as of
the date of grant set forth below (the "DATE OF GRANT") by and between TriQuest
Design Automation, Inc., a California corporation (the "COMPANY"), and the
participant named below ("PARTICIPANT").  Capitalized terms not defined herein
shall have the meaning ascribed to them in the Company's 1995 Stock Option Plan
(the "PLAN").


PARTICIPANT:                           ________________________________________

SOCIAL SECURITY NUMBER:                ________________________________________

ADDRESS:                               ________________________________________

                                       ________________________________________

TOTAL OPTION SHARES:                   ________________________________________

EXERCISE PRICE PER SHARE:              ________________________________________

DATE OF GRANT:                         ________________________________________

VESTING COMMENCEMENT DATE:             ________________________________________

FIRST VESTING DATE:                    ________________________________________

EXPIRATION DATE:                       ________________________________________

TYPE OF STOCK OPTION                   ________________________________________

(CHECK ONE):                           [  ] INCENTIVE STOCK OPTION

                                       [  ] NONQUALIFIED STOCK OPTION


    1.  GRANT OF OPTION.  The Company hereby grants to Participant an option 
(the "OPTION") to purchase the total number of shares of Common Stock of the 
Company set forth above (the "SHARES") at the Exercise Price Per Share set 
forth above (the "EXERCISE PRICE"), subject to all of the terms and 
conditions of this Agreement and the Plan.  If designated as an Incentive 
Stock Option above, the Option is intended to qualify as an "incentive stock 
option" ("ISO") within the meaning of Section 422 of the Internal Revenue 
Code of 1986, as amended (the "CODE").

<PAGE>


    2.  EXERCISE PERIOD.
                                  
        2.1  EXERCISE PERIOD OF OPTION.  The Option shall be immediately 
exercisable upon Date of Grant.  Unvested Shares (as determined herein) shall 
be subject to the Company's Repurchase Option (as defined in Section 8 of the 
Exercise Agreement) at the Exercise Price (proportionally adjusted to reflect 
any stock dividend, stock split, reverse stock split or recapitalization of 
the Common Stock of the Company after the Date of Grant).  The Shares subject 
to the Option shall vest over four (4) years and be deemed "VESTED SHARES" as 
follows, provided that the Participant continuously provides services to the 
Company or any Subsidiary Parent or Affiliate of the Company at all times 
between the Vesting Commencement Date and the vesting dates specified 
hereafter:  on the First Vesting Date one-eighth (1/8) of the Shares will 
become Vested Shares; and thereafter, an additional one-forty-eighth (1/48) 
of the Shares will become Vested Shares upon the expiration of each 
successive month after the First Vesting Date, until the Shares are fully 
vested.  The vesting shall occur regardless of whether or not this Option has 
been exercised in whole or in part.  Until the Shares have vested, 
Participant shall have no right to transfer or convey the Shares.  No Shares 
will become Vested Shares after the Termination Date and no Unvested Shares 
may be exercised after the Termination Date.  Shares that are not Vested 
Shares shall be referred to as "UNVESTED SHARES".  The number of Shares that 
are Vested Shares or Unvested Shares will be proportionally adjusted to 
reflect any stock dividend, stock split, reverse stock split or 
recapitalization of the Common Stock of the Company occurring after the Date 
of Grant.  If application of the vesting fraction causes a fractional Share, 
such Share shall be rounded down to a whole Share.  

        2.2  EXPIRATION.  Subject to Section 3 below, the Option shall expire 
on the Expiration Date set forth above and must be exercised, if at all, on 
or before the Expiration Date.

    3.  TERMINATION.  

        3.1  TERMINATION FOR ANY REASON EXCEPT DEATH OR DISABILITY.  If 
Participant is Terminated for any reason, except death or Disability, the 
Option, to the extent (and only to the extent) that it would have been 
exercisable by Participant on the date of Termination, may be exercised by 
Participant no later than thirty (30) days after the date of Termination, but 
in any event no later than the Expiration Date.

        3.2  TERMINATION BECAUSE OF DEATH OR DISABILITY.  If Participant is 
Terminated because of death or Disability of Participant, the Option, to the 
extent that it is exercisable by Participant on the date of Termination, may 
be exercised by Participant (or Participant's legal representative) no later 
than twelve (12) months after the date of Termination in the case of 
Disability or eighteen (18) months in the case of death, but in any event no 
later than the Expiration Date.

        3.3  NO OBLIGATION TO EMPLOY.  Nothing in the Plan or this Agreement 
shall confer on Participant any right to continue in the employ of, or other 
relationship with, the Company or any Parent, Subsidiary or Affiliate of the 
Company, or limit in any way the right of the Company or 


                                      -2-
<PAGE>

any Parent, Subsidiary or Affiliate of the Company to terminate Participant's 
employment or other relationship at any time, with or without cause.

    4.  MANNER OF EXERCISE.

        4.1  STOCK OPTION EXERCISE AGREEMENT.  To exercise this Option, 
Participant (or in the case of exercise after Participant's death, 
Participant's executor, administrator, heir or legatee, as the case may be) 
must deliver to the Company an executed stock option exercise agreement 
substantially in the form attached hereto as EXHIBIT A, or in such other form 
as may be approved by the Company from time to time (the "EXERCISE 
AGREEMENT"), which shall set forth, INTER ALIA, Participant's election to 
exercise the Option, the number of Shares being purchased, any restrictions 
imposed on the Shares and any representations, warranties and agreements 
regarding Participant's investment intent and access to information as may be 
required by the Company to comply with applicable securities laws.  If 
someone other than Participant exercises the Option, then such person must 
submit documentation reasonably acceptable to the Company that such person 
has the right to exercise the Option.

        4.2  LIMITATIONS ON EXERCISE.  The Option may not be exercised unless 
such exercise is in compliance with all applicable federal and state 
securities laws, as they are in effect on the date of exercise.  The Option 
may not be exercised as to fewer than 100 Shares unless it is exercised as to 
all Shares as to which the Option is then exercisable.

        4.3  PAYMENT.  The Exercise Agreement shall be accompanied by full 
payment of the Exercise Price for the Shares being purchased (a) in cash, (b) 
by check, (c) by cancellation of indebtedness of the Company to the 
Participant, or (d) by any combination of the foregoing.

        4.4  TAX WITHHOLDING.  Prior to the issuance of the Shares upon 
exercise of the Option, Participant must pay or provide for any applicable 
federal or state withholding obligations of the Company.  If the Committee 
permits, Participant may provide for payment of withholding taxes upon 
exercise of the Option by requesting that the Company retain Shares with a 
Fair Market Value equal to the minimum amount of taxes required to be 
withheld.  In such case, the Company shall issue the net number of Shares to 
the Participant by deducting the Shares retained from the Shares issuable 
upon exercise.  

        4.5  ISSUANCE OF SHARES.  Provided that the Exercise Agreement and 
payment are in form and substance satisfactory to counsel for the Company, 
the Company shall issue the Shares registered in the name of Participant, 
Participant's authorized assignee, or Participant's legal representative, and 
shall deliver certificates representing the Shares with the appropriate 
legends affixed thereto.

    5.  NOTICE OF DISQUALIFYING DISPOSITION OF ISO SHARES.  If the Option is 
an ISO, and if Participant sells or otherwise disposes of any of the Shares 
acquired pursuant to the ISO on or 


                                      -3-
<PAGE>

before the later of (1) the date two years after the Date of Grant, and (2) 
the date one year after transfer of such Shares to Participant upon exercise 
of the Option, Participant shall immediately notify the Company in writing of 
such disposition.  Participant agrees that Participant may be subject to 
income tax withholding by the Company on the compensation income recognized 
by Participant from the early disposition by payment in cash or out of the 
current wages or other compensation payable to Participant.

    6.  COMPLIANCE WITH LAWS AND REGULATIONS.  The exercise of the Option and 
the issuance and transfer of Shares shall be subject to compliance by the 
Company and Participant with all applicable requirements of federal and state 
securities laws and with all applicable requirements of any stock exchange on 
which the Company's Common Stock may be listed at the time of such issuance 
or transfer.  Participant understands that the Company is under no obligation 
to register or qualify the Shares with the Securities and Exchange 
Commission, any state securities commission or any stock exchange to effect 
such compliance.

    7.  NONTRANSFERABILITY OF OPTION.  The Option may not be transferred in 
any manner other than by will or by the laws of descent and distribution and 
may be exercised during the lifetime of Participant only by Participant.  The 
terms of the Option shall be binding upon the executors, administrators, 
successors and assigns of Participant.

    8.  TAX CONSEQUENCES.  Set forth below is a brief summary as of the Date 
of Grant of some of the federal and California tax consequences of exercise 
of the Option and disposition of the Shares.  THIS SUMMARY IS NECESSARILY 
INCOMPLETE, AND THE TAX LAWS AND REGULATIONS ARE SUBJECT TO CHANGE.  
PARTICIPANT SHOULD CONSULT A TAX ADVISER BEFORE EXERCISING THE OPTION OR 
DISPOSING OF THE SHARES.

        8.1  EXERCISE OF ISO.  If the Option qualifies as an ISO, there will 
be no regular federal or California income tax liability upon the exercise of 
the Option, although the excess, if any, of the fair market value of the 
Shares on the date of exercise over the Exercise Price will be treated as a 
tax preference item for federal income tax purposes and may subject the 
Participant to the alternative minimum tax in the year of exercise, as 
discussed further in Section 8.4 below.  

        8.2  EXERCISE OF NONQUALIFIED STOCK OPTION.  If the Option does not 
qualify as an ISO, there may be a regular federal and California income tax 
liability upon the exercise of the Option.  Participant will be treated as 
having received compensation income (taxable at ordinary income tax rates) 
equal to the excess, if any, of the fair market value of the Shares on the 
date of exercise over the Exercise Price.  The Company will be required to 
withhold from Participant's compensation or collect from Participant and pay 
to the applicable taxing authorities an amount equal to a percentage of this 
compensation income at the time of exercise.

        8.3  DISPOSITION OF SHARES.  If the Shares are held for more than 
twelve (12) months after the date of the transfer of the Shares pursuant to 
the exercise of the Option for Vested 


                                      -4-
<PAGE>

Shares (or for more then twelve (12) months after the date of transfer of the 
Shares pursuant to the exercise of an Option for Unvested Shares for which a 
Section 83(b) election has been made) and, in the case of an ISO, are 
disposed of more than two years after the Date of Grant, any gain realized on 
disposition of the Shares will be treated as long term capital gain for 
federal and California income tax purposes.  If Shares purchased under an ISO 
are disposed of within the applicable one or two year period, any gain 
realized on such disposition will be treated as compensation income (taxable 
at ordinary income rates) to the extent of the excess, if any, of the Fair 
Market Value of the Shares on the date of exercise over the Exercise Price.  
The Company will be required to withhold from Participant's compensation or 
collect from Participant and pay to the applicable taxing authorities an 
amount equal to a percentage of this compensation income at the time of 
exercise.

        8.4  SECTION 83(b) ELECTION FOR UNVESTED SHARES. With respect to 
Unvested Shares, which are subject to the Repurchase Option, unless an 
election is filed by the Participant with the Internal Revenue Service (and, 
if necessary, the proper state taxing authorities), WITHIN 30 DAYS of the 
purchase of the Unvested Shares, electing pursuant to Section 83(b) of the 
Internal Revenue Code (and similar state tax provisions, if applicable) to be 
taxed currently on any difference between the Exercise Price of the Unvested 
Shares and their Fair Market Value on the date of purchase, there may be a 
recognition of taxable income (including, where applicable, alternative 
minimum tax) to the Participant, measured by the excess, if any, of the Fair 
Market Value of the Unvested Shares, at the time they cease to be Unvested 
Shares, over the Exercise Price of such Shares.

    9.  PRIVILEGES OF STOCK OWNERSHIP.  Participant shall not have any of the 
rights of a shareholder with respect to any Shares until Participant 
exercises the Option and pays the Exercise Price.

    10. INTERPRETATION.  Any dispute regarding the interpretation of this 
Agreement shall be submitted by Participant or the Company to the Committee 
for review.  The resolution of such a dispute by the Committee shall be final 
and binding on the Company and Participant.

    11. ENTIRE AGREEMENT.  The Plan is incorporated herein by reference.  
This Agreement and the Plan constitute the entire agreement of the parties 
and supersede all prior undertakings and agreements with respect to the 
subject matter hereof.

    12. NOTICES.  Any notice required to be given or delivered to the Company 
under the terms of this Agreement shall be in writing and addressed to the 
Corporate Secretary of the Company at its principal corporate offices.  Any 
notice required to be given or delivered to Participant shall be in writing 
and addressed to Participant at the address indicated above or to such other 
address as such party may designate in writing from time to time to the 
Company.  All notices shall be deemed to have been given or delivered upon:  
personal delivery; three (3) days after deposit in the United States mail by 
certified or registered mail (return receipt requested); one (1) business day 
after deposit with any return receipt express courier (prepaid); or one (1) 
business day after transmission by rapifax or telecopier.


                                      -5-

<PAGE>

     13. SUCCESSORS AND ASSIGNS.  The Company may assign any of its rights 
under this Agreement.  This Agreement shall be binding upon and inure to the 
benefit of the successors and assigns of the Company.  Subject to the 
restrictions on transfer set forth herein, this Agreement shall be binding 
upon Participant and Participant's heirs, executors, administrators, legal 
representatives, successors and assigns.

    14. GOVERNING LAW.  This Agreement shall be governed by and construed in 
accordance with the laws of the State of California as such laws are applied 
to agreements between California residents entered into and to be performed 
entirely within California.

    15. ACCEPTANCE.  Participant hereby acknowledges receipt of a copy of the 
Plan and this Agreement.  Participant has read and understands the terms and 
provisions thereof, and accepts the Option subject to all the terms and 
conditions of the Plan and this Agreement.  Participant acknowledges that 
there may be adverse tax consequences upon exercise of the Option or 
disposition of the Shares and that Participant should consult a tax adviser 
prior to such exercise or disposition.







          [REMAINDER OF THIS PAGE LEFT BLANK INTENTIONALLY]

















                                      -6-

<PAGE>

    IN WITNESS WHEREOF, the Company has caused this Agreement to be executed 
in duplicate by its duly authorized representative and Participant has 
executed this Agreement in duplicate as of the Date of Grant.


TRIQUEST DESIGN AUTOMATION, INC.         PARTICIPANT

By:______________________________        _____________________________________
                                         (Signature)

_________________________________        _____________________________________
(Please print name)                      (Please print name)

_________________________________
(Please print title)







  [SIGNATURE PAGE TO TRIQUEST DESIGN AUTOMATION, INC. STOCK OPTION AGREEMENT]














                                      -7-


<PAGE>

                                                             Exh. 5.1


                                July 31, 1997

Summit Design, Inc.
9305 S.W. Gemini Drive
Beaverton, OR 97008


    RE:   REGISTRATION STATEMENT ON FORM S-8


Ladies and Gentlemen:


    We have examined the Registration Statement on Form S-8 (the 
"Registration Statement") to be filed by Summit Design, Inc., a Delaware 
corporation (the "Registrant" or "you"), with the Securities and Exchange 
Commission on or about July 31, 1997, in connection with the registration 
under the Securities Act of 1933, as amended (the "1933 Act"), of an 
aggregate of 196,538 shares of your Common Stock, $0.01 par value (the 
"Shares"), reserved for issuance pursuant to the TriQuest Design Automation, 
Inc. 1995 Stock Option Plan (the "Plan"). As your legal counsel, we have 
examined the proceedings taken and are familiar with the proceedings proposed 
to be taken by you in connection with the sale and issuance of the Shares by 
the Registrant under the Plan.

    It is our opinion that the Shares will be, when issued and sold in the 
manner referred to in the Plan, legally issued, fully paid and nonassessable.

    We consent to the use of this opinion as an exhibit to the Registration 
Statement, and further consent to the use of our name wherever appearing in 
the Registration Statement and any subsequent amendment thereto.


                                Very truly yours, 

                                WILSON SONSINI GOODRICH & ROSATI
                                Professional Corporation

                                /s/ Wilson Sonsini Goodrich & Rosati


<PAGE>

                                                             Exh. 23.1

                      CONSENT OF INDEPENDENT ACCOUNTANTS



We consent to the incorporation by reference in this Registration Statement 
of Summit Design, Inc. on Form S-8 (i) of our report dated February 20, 1997 
on the financial statements of TriQuest Design Automation, Inc. as of 
December 31, 1996 and 1995 and for the year ended December 31, 1996 and for 
the period from inception, February 15, 1995, to December 31, 1995, which 
report is included in the Current Report on Form 8-K dated February 28, 1997 
and (ii) of our report dated January 24, 1997, except for Note 14, for which 
the date is February 28, 1997, on our audits of the consolidated financial 
statements and financial statement schedule of Summit Design, Inc, and its 
subsidiaries as of December 31, 1996 and 1995 and for each of the three years 
in the period ended December 31, 1996, which report is included in the Annual 
Report on Form 10-K for the year ended December 31, 1996.




                                             /s/ Coopers & Lybrand L.L.P.



Portland Oregon
July 31, 1997



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