SUMMIT DESIGN INC
S-8, 1998-03-09
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<PAGE>

     As filed with the Securities and Exchange Commission on March 9, 1998
                                           Registration Statement No. 333-_____
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------

                       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 of                                              (I.R.S. Employer
 Incorporation or                                              Identification
  Organization)                                                   Number)

                9305 S.W. Gemini Drive, Beaverton, Oregon 97008
                (Address of Principal Executive Officer)                       
                                                          
                            -----------------------

                               1997 NONSTATUTORY
                               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        Proposed
                                            Maximum         Maximum
                             Amount to      Offering        Aggregate         Amount of
 Title of Securities to be      be          Price Per       Offering         Registration
         Registered          Registered     Share (1)        Price               Fee
- -----------------------------------------------------------------------------------------
<S>                             <C>         <C>              <C>              <C>
Common Stock, $0.01 par         250,000     $10.16/$13.69    $2,592,950.00    $764.92
value                           shares                            

Reserved and outstanding
under the 1997 NonStatutory
Stock Option Plan
- -----------------------------------------------------------------------------------------
</TABLE>

(1)  Computed in accordance with Rule 457(h) and 457(c) under the Securities
     Act of 1933.  Such computation is based on the weighted average exercise
     price of $10.16 per share covering 235,000 outstanding options and the
     estimated exercise price of $13.69 per share covering 15,000 authorized
     but unissued shares.  The estimated exercise price of $13.69 per share
     was computed in accordance with Rule 457 by averaging the high and low
     prices of a share of Summit Design, Inc. Common Stock as reported in the
     Nasdaq National Market on March 3, 1998.
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
<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 Registrant's Quarterly Report on Form 10-Q for the fiscal quarter
          ended June 30, 1997, filed pursuant to Section 13(a) of the Exchange
          Act.

     6.   The Registrant's Current Report on Form 8-K dated September 9, 1997,
          filed pursuant to Section 13(a) of the Exchange Act.

     7.   The Registrant's Quarterly Report on Form 10-Q for the fiscal quarter
          ended September 30, 1997, filed pursuant to Section 13(a) of the
          Exchange Act.

     8.   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 Securities Exchange Act of
          1934, as amended (the "Exchange Act"), which was 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.


                                      -2-
<PAGE>

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.

     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.


                                     -3-
<PAGE>

ITEM 8.        INDEX TO EXHIBITS.
<TABLE>
<CAPTION>

 Exhibit
  Number                         Description of Document
- --------  ---------------------------------------------------------------------
<S>       <C>
 4.1      1997 Nonstatutory 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 6)
</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

               (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 

                                 -4-
<PAGE>

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.


                                     -5-
<PAGE>

                                     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 6th day of  March,
1998.

                              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.


        Signatures                   Title                  Date
- -----------------------   -----------------------   ------------------------

/s/ Larry J. Gerhard      Chairman of the Board,          March 6, 1998
- -----------------------   President and Chief
Larry J. Gerhard          Executive Officer
                          (Principal Executive
                          Officer)

/s/ C. Albert Koob        Vice President - Finance,       March 6, 1998
- ----------------------    Chief Financial Officer
C. Albert Koob            and Secretary (Principal
                          Financial and Accounting
                          Officer)

/s/ William V. Botts      Director                        March 6, 1998
- ----------------------
William V. Botts

/s/ Amihai Ben-David      Director                        March 6, 1998
- ----------------------
Amihai Ben-David

/s/ Steven P. Erwin       Director                        March 6, 1998
- ----------------------
Steven P. Erwin

/s/ Barbara M. Karmel     Director                        March 6, 1998
- ----------------------
Barbara M. Karmel


                                      -6-
<PAGE>

                                INDEX TO EXHIBITS
                                -----------------
<TABLE>
<CAPTION>

 Exhibit
  Number                        Description of Document
- --------  ---------------------------------------------------------------------
 <S>      <C>
  4.1     1997 NonStatutory 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 6)
</TABLE>
__________________


                                    -7-

<PAGE>

                                                                  EXHIBIT 4.1


                              SUMMIT DESIGN, INC.

                      1997 NONSTATUTORY STOCK OPTION PLAN



     1.   PURPOSES OF THE PLAN.  The purposes of this Nonstatutory Stock 
Option Plan are:

          -    to attract and retain the best available personnel for 
               positions of substantial responsibility, 

          -    to provide additional incentive to Employees, Directors and 
               Consultants, and 

          -    to promote the success of the Company's business.  

          Options granted under the Plan will be nonstatutory stock options.  

     2.   DEFINITIONS.  As used herein, the following definitions shall apply:

          (a)  "ADMINISTRATOR" means the Board or any of its Committees as 
shall be administering the Plan, in accordance with Section 4 of the Plan.

          (b)  "APPLICABLE LAWS" means the requirements relating to the 
administration of stock option plans under U.S. state corporate laws, U.S. 
federal and state securities laws, the Code, any stock exchange or quotation 
system on which the Common Stock is listed or quoted and the applicable laws 
of any foreign country or jurisdiction where Options are, or will be, granted 
under the Plan.

          (c)  "BOARD" means the Board of Directors of the Company.

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

          (e)  "COMMITTEE"  means a committee of Directors appointed by the 
Board in accordance with Section 4 of the Plan.

          (f)  "COMMON STOCK" means the Common Stock of the Company.

          (g)  "COMPANY" means Summit Design, Inc., a Delaware corporation.

          (h)  "CONSULTANT" means any person, including an advisor, engaged 
by the Company or a Parent or Subsidiary to render services to such entity, 
and any director of the Company whether compensated for such services or not.

          (i)  "DIRECTOR" means a member of the Board.


                                     -9-
<PAGE>

          (j)  "DISABILITY" means total and permanent disability as defined 
in Section 22(e)(3) of the Code.

          (k)  "EMPLOYEE" means any person, including Officers, employed by 
the Company or any Parent or Subsidiary of the Company.  A Service Provider 
shall not cease to be an Employee in the case of (i) any leave of absence 
approved by the Company or (ii) transfers between locations of the Company or 
between the Company, its Parent, any Subsidiary, or any successor.  Neither 
service as a Director nor payment of a director's fee by the Company shall be 
sufficient to constitute "employment" by the Company.

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

          (m)  "FAIR MARKET VALUE" means, as of any date, the value of Common 
Stock determined as follows:

               (i)   If the Common Stock is listed on any established stock 
exchange or a national market system, including without limitation the Nasdaq 
National Market or The Nasdaq SmallCap Market of The Nasdaq Stock Market, its 
Fair Market Value shall be the closing sales price for such stock (or the 
closing bid, if no sales were reported) as quoted on such exchange or system 
for the last market trading day prior to the time of determination, as 
reported in THE WALL STREET JOURNAL or such other source as the Administrator 
deems reliable;

               (ii)  If the Common Stock is regularly quoted by a recognized 
securities dealer but selling prices are not reported, the Fair Market Value 
of a Share of Common Stock shall be the mean between the high bid and low 
asked prices for the Common Stock on the last market trading day prior to the 
day of determination, as reported in THE WALL STREET JOURNAL or such other 
source as the Administrator deems reliable;

               (iii) In the absence of an established market for the Common 
Stock, the Fair Market Value shall be determined in good faith by the 
Administrator.

          (n)  "NOTICE OF GRANT" means a written or electronic notice 
evidencing certain terms and conditions of an individual Option grant.  The 
Notice of Grant is part of the Option Agreement.

          (o)  "OFFICER" means a person who is an officer of the Company 
within the meaning of Section 16 of the Exchange Act and the rules and 
regulations promulgated thereunder.

          (p)  "OPTION" means a nonstatutory stock option granted pursuant to 
the Plan, that is not intended to qualify as an incentive stock option within 
the meaning of Section 422 of the Code and the regulations promulgated 
thereunder.


                                     -10-
<PAGE>

          (q)  "OPTION AGREEMENT" means an agreement between the Company and 
an Optionee evidencing the terms and conditions of an individual Option 
grant.  The Option Agreement is subject to the terms and conditions of the 
Plan. 

          (r)  "OPTION EXCHANGE PROGRAM" means a program whereby outstanding 
options are surrendered in exchange for options with a lower exercise price.

          (s)  "OPTIONED STOCK" means the Common Stock subject to an Option.

          (t)  "OPTIONEE" means the holder of an outstanding Option granted 
under the Plan.

          (u)  "PARENT" means a "parent corporation," whether now or 
hereafter existing, as defined in Section 424(e) of the Code.

          (v)  "PLAN" means this 1997 Nonstatutory Stock Option Plan.

          (w)  "SERVICE PROVIDER" means an Employee, Consultant or Director.

          (x)  "SHARE" means a share of the Common Stock, as adjusted in 
accordance with Section 12 of the Plan.

          (y)  "SUBSIDIARY" means a "subsidiary corporation," whether now or 
hereafter existing, as defined in Section 424(f) of the Code.

     3.   STOCK SUBJECT TO THE PLAN.  Subject to the provisions of Section 12 
of the Plan, the maximum aggregate number of Shares which may be optioned and 
sold under the Plan is 250,000 Shares.  The Shares may be authorized, but 
unissued, or reacquired Common Stock.

          If an Option expires or becomes unexercisable without having been 
exercised in full, or is surrendered pursuant to an Option Exchange Program, 
the unpurchased Shares which were subject thereto shall become available for 
future grant or sale under the Plan (unless the Plan has terminated).

     4.   ADMINISTRATION OF THE PLAN.

     (a)  ADMINISTRATION.  The Plan shall be administered by (i) the Board or 
(ii) a Committee, which committee shall be constituted to satisfy Applicable 
Laws. 

     (b)  POWERS OF THE ADMINISTRATOR.  Subject to the provisions of the 
Plan, and in the case of a Committee, subject to the specific duties 
delegated by the Board to such Committee, the Administrator shall have the 
authority, in its discretion:


                                   -11-
<PAGE>

          (i)    to determine the Fair Market Value of the Common Stock;

          (ii)   to select the Service Providers to whom Options may be 
granted hereunder;

          (iii)  to determine whether and to what extent Options are granted 
hereunder;

          (iv)   to determine the number of shares of Common Stock to be 
covered by each Option granted hereunder;

          (v)    to approve forms of agreement for use under the Plan;

          (vi)   to determine the terms and conditions, not inconsistent with 
the terms of the Plan, of any award granted hereunder.  Such terms and 
conditions include, but are not limited to, the exercise price, the time or 
times when Options may be exercised (which may be based on performance 
criteria), any vesting acceleration or waiver of forfeiture restrictions, and 
any restriction or limitation regarding any Option  or the shares of Common 
Stock relating thereto, based in each case on such factors as the 
Administrator, in its sole discretion, shall determine;

          (vii)  to reduce the exercise price of any Option to the then 
current Fair Market Value if the Fair Market Value of the Common Stock 
covered by such Option shall have declined since the date the Option was 
granted;

          (viii) to institute an Option Exchange Program;

          (ix)   to construe and interpret the terms of the Plan and awards 
granted pursuant to the Plan;

          (x)    to prescribe, amend and rescind rules and regulations 
relating to the Plan, including rules and regulations relating to sub-plans 
established for the purpose of qualifying for preferred tax treatment under 
foreign tax laws;

          (xi)   to modify or amend each Option (subject to Section 14(b) of 
the Plan), including the discretionary authority to extend the 
post-termination exercisability period of Options longer than is otherwise 
provided for in the Plan;

          (xii)  to authorize any person to execute on behalf of the Company 
any instrument required to effect the grant of an Option previously granted 
by the Administrator;


                                     -12-
<PAGE>

          (xiii) to determine the terms and restrictions applicable to Options; 

          (xiv)  to allow Optionees to satisfy withholding tax obligations by 
electing to have the Company withhold from the Shares to be issued upon 
exercise of an Option that number of Shares having a Fair Market Value equal 
to the amount required to be withheld.  The Fair Market Value of the Shares 
to be withheld shall be determined on the date that the amount of tax to be 
withheld is to be determined.  All elections by an Optionee to have Shares 
withheld for this purpose shall be made in such form and under such 
conditions as the Administrator may deem necessary or advisable; and

          (xv)   to make all other determinations deemed necessary or 
advisable for administering the Plan.

     (c)  EFFECT OF ADMINISTRATOR'S DECISION.  The Administrator's decisions, 
determinations and interpretations shall be final and binding on all 
Optionees and any other holders of Options.

     5.   ELIGIBILITY.  Options may be granted to Service Providers; 
provided, however, that notwithstanding anything to the contrary contained in 
the Plan, no greater than 25,000 Options may be granted to Directors and 
persons considered to be "officers" by the Nasdaq Stock Market.

     6.   LIMITATION.  Neither the Plan nor any Option shall confer upon an 
Optionee any right with respect to continuing the Optionee's relationship as 
a Service Provider with the Company, nor shall they interfere in any way with 
the Optionee's right or the Company's right to terminate such relationship at 
any time, with or without cause.

     7.   TERM OF PLAN.  The Plan shall become effective upon its adoption by 
the Board.  It shall continue in effect for ten (10) years, unless sooner 
terminated under Section 14 of the Plan. 

     8.   TERM OF OPTION.  The term of each Option shall be stated in the 
Option Agreement. 

     9.   OPTION EXERCISE PRICE AND CONSIDERATION.

          (a)  EXERCISE PRICE.  The per share exercise price for the Shares 
to be issued pursuant to exercise of an Option shall be determined by the 
Administrator.

          (b)  WAITING PERIOD AND EXERCISE DATES.  At the time an Option is 
granted, the Administrator shall fix the period within which the Option may 
be exercised and shall determine any conditions which must be satisfied 
before the Option may be exercised.


                                      -13-
<PAGE>

          (c)  FORM OF CONSIDERATION.  The Administrator shall determine the 
acceptable form of consideration for exercising an Option, including the 
method of payment.  Such consideration may consist entirely of:

               (i)   cash;

               (ii)  check;

               (iii) promissory note;

               (iv)  other Shares which (A) in the case of Shares acquired 
upon exercise of an option, have been owned by the Optionee for more than six 
months on the date of surrender, and (B) have a Fair Market Value on the date 
of surrender equal to the aggregate exercise price of the Shares as to which 
said Option shall be exercised;

               (v)   delivery of a properly executed exercise notice together 
with such other documentation as the Administrator and the broker, if 
applicable, shall require to effect an exercise of the Option and delivery to 
the Company of the sale or loan proceeds required to pay the exercise price; 

               (vi)  such other consideration and method of payment for the 
issuance of Shares to the extent permitted by Applicable Laws; or

               (vii) any combination of the foregoing methods of payment.

     10.  EXERCISE OF OPTION.

          (a)  PROCEDURE FOR EXERCISE; RIGHTS AS A STOCKHOLDER. Any Option 
granted hereunder shall be exercisable according to the terms of the Plan and 
at such times and under such conditions as determined by the Administrator 
and set forth in the Option Agreement.  An Option may not be exercised for a 
fraction of a Share.

               An Option shall be deemed exercised when the Company receives: 
(i) written or electronic notice of exercise (in accordance with the Option 
Agreement) from the person entitled to exercise the Option, and (ii) full 
payment for the Shares with respect to which the Option is exercised.  Full 
payment may consist of any consideration and method of payment authorized by 
the Administrator and permitted by the Option Agreement and the Plan.  Shares 
issued upon exercise of an Option shall be issued in the name of the Optionee 
or, if requested by the Optionee, in the name of the Optionee and his or her 
spouse.  Until the Shares are issued (as evidenced by the appropriate entry 
on the books of the Company or of a duly authorized transfer agent of the 
Company), no right to vote or receive dividends or any other rights as a 
stockholder shall exist with respect to the Optioned Stock, notwithstanding 
the 


                                    -14-
<PAGE>

exercise of the Option.  The Company shall issue (or cause to be issued) such 
Shares promptly after the Option is exercised.  No adjustment will be made 
for a dividend or other right for which the record date is prior to the date 
the Shares are issued, except as provided in Section 12 of the Plan.

               Exercising an Option in any manner shall decrease the number 
of Shares thereafter available, both for purposes of the Plan and for sale 
under the Option, by the number of Shares as to which the Option is exercised.

          (b)  TERMINATION OF RELATIONSHIP AS A SERVICE PROVIDER.  If an 
Optionee ceases to be a Service Provider, other than upon the Optionee's 
death or Disability, the Optionee may exercise his or her Option, but only 
within such period of time as is specified in the Option Agreement, and only 
to the extent that the Option is vested on the date of termination (but in no 
event later than the expiration of the term of such Option as set forth in 
the Option Agreement). In the absence of a specified time in the Option 
Agreement, the Option shall remain exercisable for sixty (60) days following 
the Optionee's termination. If, on the date of termination, the Optionee is 
not vested as to his or her entire Option, the Shares covered by the unvested 
portion of the Option shall revert to the Plan.  If, after termination, the 
Optionee does not exercise his or her Option within the time specified by the 
Administrator, the Option shall terminate, and the Shares covered by such 
Option shall revert to the Plan. Notwithstanding the above provisions of this 
Section 10(b), in the event of an Optionee's change of status from Employee 
to Consultant or Consultant to Employee, an Optionee's Option shall not 
automatically terminate solely as a result of such change of status.

          (c)  DISABILITY OF OPTIONEE.  If an Optionee ceases to be a Service 
Provider as a result of the Optionee's Disability, the Optionee may exercise 
his or her Option within such period of time as is specified in the Option 
Agreement, to the extent the Option is vested on the date of termination (but 
in no event later than the expiration of the term of such Option as set forth 
in the Option Agreement).  In the absence of a specified time in the Option 
Agreement, the Option shall remain exercisable for twelve (12) months 
following the Optionee's termination.  If, on the date of termination, the 
Optionee is not vested as to his or her entire Option, the Shares covered by 
the unvested portion of the Option shall revert to the Plan.  If, after 
termination, the Optionee does not exercise his or her Option within the time 
specified herein, the Option shall terminate, and the Shares covered by such 
Option shall revert to the Plan.

          (d)  DEATH OF OPTIONEE.  If an Optionee dies while a Service 
Provider, the Option may be exercised within such period of time as is 
specified in the Option Agreement (but in no event later than the expiration 
of the term of such Option as set forth in the Notice of Grant), by the 
Optionee's estate or by a person who acquires the right to exercise the 
Option by bequest or inheritance, but only to the extent that the Option is 
vested on the date of death.  In the absence of a specified time in the 
Option Agreement, the Option shall remain exercisable for twelve (12) months 
following the Optionee's termination.  If, at the time of death, the Optionee 
is not vested as to his or her entire Option, the Shares covered by the 


                                     -15-
<PAGE>

unvested portion of the Option shall immediately revert to the Plan.  The 
Option may be exercised by the executor or administrator of the Optionee's 
estate or, if none, by the person(s) entitled to exercise the Option under 
the Optionee's will or the laws of descent or distribution.  If the Option is 
not so exercised within the time specified herein, the Option shall 
terminate, and the Shares covered by such Option shall revert to the Plan.

          (e)  BUYOUT PROVISIONS.  The Administrator may at any time offer to 
buy out for a payment in cash or Shares, an Option previously granted based 
on such terms and conditions as the Administrator shall establish and 
communicate to the Optionee at the time that such offer is made.

     11.  NON-TRANSFERABILITY OF OPTIONS .  Unless determined otherwise by 
the Administrator, an Option may not be sold, pledged, assigned, 
hypothecated, transferred, or disposed of in any manner other than by will or 
by the laws of descent or distribution and may be exercised, during the 
lifetime of the Optionee, only by the Optionee.  If the Administrator makes 
an Option transferable, such Option shall contain such additional terms and 
conditions as the Administrator deems appropriate.

     12.  ADJUSTMENTS UPON CHANGES IN CAPITALIZATION, DISSOLUTION, MERGER OR 
          ASSET SALE. 

          (a)  CHANGES IN CAPITALIZATION.  Subject to any required action by 
the stockholders of the Company, the number of shares of Common Stock covered 
by each outstanding Option, and the number of shares of Common Stock which 
have been authorized for issuance under the Plan but as to which no Options 
have yet been granted or which have been returned to the Plan upon 
cancellation or expiration of an Option, as well as the price per share of 
Common Stock covered by each such outstanding Option, shall be 
proportionately adjusted for any increase or decrease in the number of issued 
shares of Common Stock resulting from a stock split, reverse stock split, 
stock dividend, combination or reclassification of the Common Stock, or any 
other increase or decrease in the number of issued shares of Common Stock 
effected without receipt of consideration by the Company; provided, however, 
that conversion of any convertible securities of the Company shall not be 
deemed to have been "effected without receipt of consideration."  Such 
adjustment shall be made by the Board, whose determination in that respect 
shall be final, binding and conclusive. Except as expressly provided herein, 
no issuance by the Company of shares of stock of any class, or securities 
convertible into shares of stock of any class, shall affect, and no 
adjustment by reason thereof shall be made with respect to, the number or 
price of shares of Common Stock subject to an Option. 

          (b)  DISSOLUTION OR LIQUIDATION.  In the event of the proposed 
dissolution or liquidation of the Company, the Administrator shall notify 
each Optionee as soon as practicable prior to the effective date of such 
proposed transaction. The Optionee shall have the right to exercise his or 
her Option until ten (10) days prior to such transaction as to all of the 
Optioned Stock covered thereby, including Shares as to which the Option would 
not otherwise be exercisable.  In addition, any Company repurchase option 


                                      -16-
<PAGE>

applicable to any Shares purchased upon exercise of an Option shall lapse as 
to all such Shares, provided the proposed dissolution or liquidation takes 
place at the time and in the manner contemplated.  To the extent it has not 
been previously exercised, an Option will terminate immediately prior to the 
consummation of such proposed action.

          (c)  MERGER OR ASSET SALE.  In the event of a merger of the Company 
with or into another corporation, or the sale of substantially all of the 
assets of the Company, each outstanding Option shall be assumed or an 
equivalent option or right substituted by the successor corporation or a 
Parent or Subsidiary of the successor corporation.  In the event that the 
successor corporation refuses to assume or substitute for the Option, the 
Optionee shall fully vest in and have the right to exercise the Option as to 
all of the Optioned Stock, including Shares as to which it would not 
otherwise be vested or exercisable.  If an Option becomes fully vested and 
exercisable in lieu of assumption or substitution in the event of a merger or 
sale of assets, the Administrator shall notify the Optionee in writing or 
electronically that the Option shall be fully vested and exercisable for a 
period of ten (10) days from the date of such notice, and the Option shall 
terminate upon the expiration of such period.  For the purposes of this 
paragraph, the Option shall be considered assumed if, following the merger or 
sale of assets, the option or right confers the right to purchase or receive, 
for each Share of Optioned Stock, immediately prior to the merger or sale of 
assets, the consideration (whether stock, cash, or other securities or 
property) received in the merger or sale of assets by holders of Common Stock 
for each Share held on the effective date of the transaction (and if holders 
were offered a choice of consideration, the type of consideration chosen by 
the holders of a majority of the outstanding Shares); provided, however, that 
if such consideration received in the merger or sale of assets is not solely 
common stock of the successor corporation or its Parent, the Administrator 
may, with the consent of the successor corporation, provide for the 
consideration to be received upon the exercise of the Option, for each Share 
of Optioned Stock to be solely common stock of the successor corporation or 
its Parent equal in fair market value to the per share consideration received 
by holders of Common Stock in the merger or sale of assets.

     13.  DATE OF GRANT.  The date of grant of an Option shall be, for all 
purposes, the date on which the Administrator makes the determination 
granting such Option, or such other later date as is determined by the 
Administrator. Notice of the determination shall be provided to each Optionee 
within a reasonable time after the date of such grant. 

     14.  AMENDMENT AND TERMINATION OF THE PLAN.

          (a)  AMENDMENT AND TERMINATION.  The Board may at any time amend, 
alter, suspend or terminate the Plan.  

          (b)  EFFECT OF AMENDMENT OR TERMINATION.  No amendment, alteration, 
suspension or termination of the Plan shall impair the rights of any 
Optionee, unless mutually agreed otherwise between the Optionee and the 
Administrator, which agreement must be in writing and signed by the Optionee 
and 


                                    -17-
<PAGE>

the Company. Termination of the Plan shall not affect the Administrator's 
ability to exercise the powers granted to it hereunder with respect to 
options granted under the Plan prior to the date of such termination.

     15.  CONDITIONS UPON ISSUANCE OF SHARES.  

          (a)  LEGAL COMPLIANCE.  Shares shall not be issued pursuant to the 
exercise of an Option unless the exercise of such Option and the issuance and 
delivery of such Shares shall comply with Applicable Laws and shall be 
further subject to the approval of counsel for the Company with respect to 
such compliance.

          (b)  INVESTMENT REPRESENTATIONS.  As a condition to the exercise of 
an Option the Company may require the person exercising such Option  to 
represent and warrant at the time of any such exercise that the Shares are 
being purchased only for investment and without any present intention to sell 
or distribute such Shares if, in the opinion of counsel for the Company, such 
a representation is required.

     16.  INABILITY TO OBTAIN AUTHORITY.  The inability of the Company to 
obtain authority from any regulatory body having jurisdiction, which 
authority is deemed by the Company's counsel to be necessary to the lawful 
issuance and sale of any Shares hereunder, shall relieve the Company of any 
liability in respect of the failure to issue or sell such Shares as to which 
such requisite authority shall not have been obtained.

     17.  RESERVATION OF SHARES.  The Company, during the term of this Plan, 
will at all times reserve and keep available such number of Shares as shall 
be sufficient to satisfy the requirements of the Plan.

     18.  ADDENDUM TO THE 1997 SUMMIT DESIGN, INC. NONSTATUTORY STOCK OPTION 
PLAN.  This Addendum shall apply to any person who is granted an Option under 
the 1997 Summit Design, Inc. Nonstatutory Stock Option Plan (the "Plan") and 
is an employee or consultant of Summit Design (EDA) Ltd. and is a resident of 
the State of Israel, or is otherwise subject to the laws of the State of 
Israel (such persons are referred to collectively hereinafter as the 
"Israelis").

          The Summit Design, Inc. Option Agreements delivered to the Israelis 
pursuant to the Options granted to the Israelis (each an "Israeli Option") 
shall contain certain terms and conditions as is required by applicable 
Israeli law or approved by the Company, including, but not limited to the 
following: 

          (a)  The Common Stock issuable upon exercise of an Israeli Option 
that is not yet vested shall be held in escrow and trust in Israel for the 
benefit of the Company and the applicable Israeli Optionee as required by 
Israeli law.


                                    -18-
<PAGE>

          (b)  To the fullest extent possible, all terms and conditions 
necessary to qualify each Israeli Option intended by the Company to be taxed 
as the Israeli equivalent of a Nonstatutory Option, to be so taxed by the 
State of Israel.

          (c)  All applicable foreign currency control requirements of any 
Israeli governmental entity.


                                    -19-
<PAGE>

                             SUMMIT DESIGN, INC.

                     1997 NONSTATUTORY STOCK OPTION PLAN

                           STOCK OPTION AGREEMENT


     Unless otherwise defined herein, the terms defined in the Plan shall 
have the same defined meanings in this Option Agreement.

I.   NOTICE OF STOCK OPTION GRANT

     [OPTIONEE'S NAME AND ADDRESS]

     You have been granted an option to purchase Common Stock of the Company, 
subject to the terms and conditions of the Plan and this Option Agreement, as 
follows:

     Grant Number                                      

     Date of Grant                                     

     Vesting Commencement Date                              

     Exercise Price per Share           $                   

     Total Number of Shares Granted                         

     Total Exercise Price               $                   

     Type of Option:                    Nonstatutory Stock Option

     Term/Expiration Date:                                  


     VESTING SCHEDULE:

     Subject to the Optionee continuing to be a Service Provider on such 
dates, this Option shall vest and become exercisable in accordance with the 
following schedule:

<PAGE>

     
[25% OF THE SHARES SUBJECT TO THE OPTION SHALL VEST TWELVE MONTHS AFTER THE 
VESTING COMMENCEMENT DATE, AND 1/48TH OF THE SHARES SUBJECT TO THE OPTION 
SHALL VEST UPON THE LAST DAY OF EACH MONTH THEREAFTER.]

     TERMINATION PERIOD:

     This Option may be exercised for 60 days after Optionee ceases to be a 
Service Provider.  Upon the death or Disability of the Optionee, this Option 
may be exercised for such longer period as provided in the Plan.  In no event 
shall this Option be exercised later than the Term/Expiration Date as 
provided above.

II.  AGREEMENT

     1.  GRANT OF OPTION.  The Plan Administrator of the Company hereby 
grants to the Optionee named in the Notice of Grant attached as Part I of 
this Agreement (the "Optionee") an option (the "Option") to purchase the 
number of Shares, as set forth in the Notice of Grant, at the exercise price 
per share set forth in the Notice of Grant (the "Exercise Price"), subject to 
the terms and conditions of the Plan, which is incorporated herein by 
reference.  Subject to Section 14(b) of the Plan, in the event of a conflict 
between the terms and conditions of the Plan and the terms and conditions of 
this Option Agreement, the terms and conditions of the Plan shall prevail.

     2.   EXERCISE OF OPTION.

          (a)  RIGHT TO EXERCISE.  This Option is exercisable during its term 
in accordance with the Vesting Schedule set out in the Notice of Grant and 
the applicable provisions of the Plan and this Option Agreement.

          (b)  METHOD OF EXERCISE.  This Option is exercisable by delivery of 
an exercise notice, in the form attached as Exhibit A (the "Exercise 
Notice"), which shall state the election to exercise the Option, the number 
of Shares in respect of which the Option is being exercised (the "Exercised 
Shares"), and such other representations and agreements as may be required by 
the Company pursuant to the provisions of the Plan.  The Exercise Notice 
shall be completed by the Optionee and delivered to the Stock Administrator 
of the Company.  The Exercise Notice shall be accompanied by payment of the 
aggregate Exercise Price as to all Exercised Shares.  This Option shall be 
deemed to be exercised upon receipt by the Company of such fully executed 
Exercise Notice accompanied by such aggregate Exercise Price.

          No Shares shall be issued pursuant to the exercise of this Option 
unless such issuance and exercise complies with Applicable Laws.  Assuming 
such compliance, for income tax purposes the Exercised Shares shall be 
considered transferred to the Optionee on the date the Option is exercised 
with respect to such Exercised Shares.

<PAGE>

     3.   METHOD OF PAYMENT.  Payment of the aggregate Exercise Price shall 
be by any of the following, or a combination thereof, at the election of the 
Optionee:

          (a)  cash;

          (b)  check;

          (c)  consideration received by the Company under a cashless 
exercise program implemented by the Company in connection with the Plan; or 

          (d)  surrender of other Shares which (i) in the case of Shares 
acquired upon exercise of an option, have been owned by the Optionee for more 
than six (6) months on the date of surrender, AND (ii) have a Fair Market 
Value on the date of surrender equal to the aggregate Exercise Price of the 
Exercised Shares.

     4.   NON-TRANSFERABILITY OF OPTION.  This Option may not be transferred 
in any manner otherwise than by will or by the laws of descent or 
distribution and may be exercised during the lifetime of Optionee only by the 
Optionee.  The terms of the Plan and this Option Agreement shall be binding 
upon the executors, administrators, heirs, successors and assigns of the 
Optionee.

     5.   TERM OF OPTION.  This Option may be exercised only within the term 
set out in the Notice of Grant, and may be exercised during such term only in 
accordance with the Plan and the terms of this Option Agreement.

     6.   TAX CONSEQUENCES.  Some of the federal tax consequences relating to 
this Option, as of the date of this Option, are set forth below.  THIS 
SUMMARY IS NECESSARILY INCOMPLETE, AND THE TAX LAWS AND REGULATIONS ARE 
SUBJECT TO CHANGE.  THE OPTIONEE SHOULD CONSULT A TAX ADVISER BEFORE 
EXERCISING THIS OPTION OR DISPOSING OF THE SHARES.

          (a)  EXERCISING THE OPTION.  The Optionee may incur regular federal 
income tax liability upon exercise of an NSO.  The Optionee 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 Exercised Shares 
on the date of exercise over their aggregate Exercise Price.  If the Optionee 
is an Employee or a former Employee, the Company will be required to withhold 
from his or her compensation or collect from Optionee and pay to the 
applicable taxing authorities an amount in cash equal to a percentage of this 
compensation income at the time of exercise, and may refuse to honor the 
exercise and refuse to deliver Shares if such withholding amounts are not 
delivered at the time of exercise.


                                      -3-
<PAGE>

          (b)  DISPOSITION OF SHARES.  If the Optionee holds NSO Shares for 
at least one year, any gain realized on disposition of the Shares will be 
treated as long-term capital gain for federal income tax purposes.

     7.   ENTIRE AGREEMENT; GOVERNING LAW.  The Plan is incorporated herein 
by reference.  The Plan and this Option Agreement constitute the entire 
agreement of the parties with respect to the subject matter hereof and 
supersede in their entirety all prior undertakings and agreements of the 
Company and Optionee with respect to the subject matter hereof, and may not 
be modified adversely to the Optionee's interest except by means of a writing 
signed by the Company and Optionee.  This agreement is governed by the 
internal substantive laws, but not the choice of law rules, of California. 

     8.   NO GUARANTEE OF CONTINUED SERVICE.  OPTIONEE ACKNOWLEDGES AND 
AGREES THAT THE VESTING OF SHARES PURSUANT TO THE VESTING SCHEDULE HEREOF IS 
EARNED ONLY BY CONTINUING AS A SERVICE PROVIDER AT THE WILL OF THE COMPANY 
(AND NOT THROUGH THE ACT OF BEING HIRED, BEING GRANTED AN OPTION OR 
PURCHASING SHARES HEREUNDER).  OPTIONEE FURTHER ACKNOWLEDGES AND AGREES THAT 
THIS AGREEMENT, THE TRANSACTIONS CONTEMPLATED HEREUNDER AND THE VESTING 
SCHEDULE SET FORTH HEREIN DO NOT CONSTITUTE AN EXPRESS OR IMPLIED PROMISE OF 
CONTINUED ENGAGEMENT AS A SERVICE PROVIDER FOR THE VESTING PERIOD, FOR ANY 
PERIOD, OR AT ALL, AND SHALL NOT INTERFERE WITH OPTIONEE'S RIGHT OR THE 
COMPANY'S RIGHT TO TERMINATE OPTIONEE'S RELATIONSHIP AS A SERVICE PROVIDER AT 
ANY TIME, WITH OR WITHOUT CAUSE.

     By your signature and the signature of the Company's representative 
below, you and the Company agree that this Option is granted under and 
governed by the terms and conditions of the Plan and this Option Agreement.  
Optionee has reviewed the Plan and this Option Agreement in their entirety, 
has had an opportunity to obtain the advice of counsel prior to executing 
this Option Agreement and fully understands all provisions of the Plan and 
Option Agreement. Optionee hereby agrees to accept as binding, conclusive and 
final all decisions or interpretations of the Administrator upon any 
questions relating to the Plan and Option Agreement.  Optionee further agrees 
to notify the Company upon any change in the residence address indicated 
below.

OPTIONEE                               SUMMIT DESIGN, INC.



___________________________________    _______________________________________
Signature                              By


                                     -4-
<PAGE>

____________________________________   ______________________________________
Print Name                             Title

____________________________________
Residence Address

____________________________________

____________________________________
Tax I.D. Number/Social Security Number


                                      -5-
<PAGE>

                                    EXHIBIT A


                               SUMMIT DESIGN, INC.

                       1997 NONSTATUTORY STOCK OPTION PLAN

                                EXERCISE NOTICE


Summit Design, Inc.
9305 S.W. Gemini Drive
Beaverton, OR 97005-7158

Attention:  Corporate Secretary

     1.   EXERCISE OF OPTION.  Effective as of today, ________________, 
199__, the undersigned ("Purchaser") hereby elects to purchase ______________ 
shares (the "Shares") of the Common Stock of Summit Design, Inc. (the 
"Company") under and pursuant to the 1997 Nonstatutory Stock Option Plan (the 
"Plan") and the Stock Option Agreement dated ____________, 19___ for Grant 
Number __________ (the "Option Agreement").  The purchase price for the 
Shares shall be $_______ per share totalling $_________, as required by the 
Option Agreement.

     2.   DELIVERY OF PAYMENT.  Purchaser herewith delivers to the Company 
the full purchase price for the Shares.

     3.   REPRESENTATIONS OF PURCHASER.  Purchaser acknowledges that 
Purchaser has received, read and understood the Plan and the Option Agreement 
and agrees to abide by and be bound by their terms and conditions.

     4.   RIGHTS AS STOCKHOLDER.  Until the issuance (as evidenced by the 
appropriate entry on the books of the Company or of a duly authorized 
transfer agent of the Company) of the Shares, no right to vote or receive 
dividends or any other rights as a stockholder shall exist with respect to 
the Optioned Stock, notwithstanding the exercise of the Option.  The Shares 
so acquired shall be issued to the Optionee as soon as practicable after 
exercise of the Option. No adjustment will be made for a dividend or other 
right for which the record date is prior to the date of issuance, except as 
provided in Section 12 of the Plan.

     5.   TAX CONSULTATION.  Purchaser understands that Purchaser may suffer 
adverse tax consequences as a result of Purchaser's purchase or disposition 
of the Shares.  Purchaser represents that Purchaser has 

<PAGE>

consulted with any tax consultants Purchaser deems advisable in connection 
with the purchase or disposition of the Shares and that Purchaser is not 
relying on the Company for any tax advice.

     6.   ENTIRE AGREEMENT; GOVERNING LAW.  The Plan and Option Agreement are 
incorporated herein by reference.  This Agreement, the Plan and the Option 
Agreement constitute the entire agreement of the parties with respect to the 
subject matter hereof and supersede in their entirety all prior undertakings 
and agreements of the Company and Purchaser with respect to the subject 
matter hereof, and may not be modified adversely to the Purchaser's interest 
except by means of a writing signed by the Company and Purchaser.  This 
agreement is governed by the internal substantive laws, but not the choice of 
law rules, of California.

Submitted by:                          Accepted by:

PURCHASER                              SUMMIT DESIGN, INC.


__________________________________     _____________________________________
Signature                              By

__________________________________     _____________________________________
Print Name                             Title

__________________________________
                                       Date Received


ADDRESS:                               ADDRESS:  9305 S.W. Gemini Drive
                                                 Beaverton, OR 97005-7158

<PAGE>

                                                                   EXHIBIT 5.1




                                    March 6, 1998

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 March 6, 1998, in connection with the registration 
under the Securities Act of 1933, as amended (the "1933 Act"), of an 
aggregate of 250,000 shares of your Common Stock, $0.01 par value (the 
"Shares"), reserved for issuance pursuant to the 1997 NonStatutory 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>


                                                                  EXHIBIT 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 August 
21, 1997 on our audits of the financial statements of Simulation 
Technologies, Corp. as of December 31, 1995 and 1996 and June 30, 1997 and 
for each of the two years in the period ended December 31, 1996, and the six 
months ended June 30, 1997, which report is included in the Current Report on 
Form 8-K dated September 9, 1997, (ii) of our report dated February 20, 1997 
on our audits of the financial statements of TriQuest Design Automation, 
Inc., as of December 31, 1995 and 1996 and for the period from inception, 
February 15, 1995, to December 31, 1995, and for the year ended December 31, 
1996 which report is included in the Current Report on Form 8-K dated 
February 28, 1997 and (iii) 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, 1995 and 1996 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
March 6, 1998                              


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