SUMMIT DESIGN INC
S-8, 1998-03-06
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<PAGE>


         As filed with the Securities and Exchange Commission on March 6, 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)
                                                         
                          -----------------------------

                          SIMULATION TECHNOLOGIES CORP.
                             1994 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      Proposed Maximum
                                                   Amount to be       Offering Price Per    Aggregate Offering        Amount of
     Title of Securities to be Registered         Registered (1)           Share (2)              Price           Registration Fee
- ----------------------------------------------------------------------------------------------------------------------------------
<S>                                               <C>                 <C>                   <C>                   <C>        
Common Stock, $0.01 par value                        657,122                $.9821             $645,359.52             $190.38
</TABLE>
(1)  Pursuant to the Agreement and Plan of Reorganization dated as of 
     September 5, 1997, by and among Summit Design, Inc. (the "Registrant"), 
     Star Acquisition, Inc. and Simulation Technologies Corp. ("SimTech"), the
     Registrant assumed all of the outstanding options to purchase Common Stock
     of SimTech under the Simulation Technologies Corp. 1994 Stock Option Plan,
     and such options became exercisable to purchase shares of Registrant's
     Common Stock, with 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 $.9821 per share. 


<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.

Exhibit
Number              Description of Document
- -------             -----------------------

4.1  Simulation Technologies Corp. 1994 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)
__________________


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 and     
 C. Albert Koob                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                                                 


<PAGE>
                                  Index to Exhibits

Exhibit
Number              Description of Document
- -------             ---------------------------------------------------------
4.1  Simulation Technologies 1994 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)     
__________________



<PAGE>


                         SIMULATION TECHNOLOGIES CORP.
                            1994 STOCK OPTION PLAN
                                       


1.  PURPOSE OF PLAN.  This Plan shall be known as the "Simulation 
Technologies Corp. 1994 Stock Option Plan," and is hereinafter referred to as 
the "Plan".  The purpose of the Plan is to aid in maintaining and developing 
personnel capable of assuring the future success of Simulation Technologies 
Corp., a Minnesota corporation (the "Company"), to offer such personnel 
additional incentives to put forth maximum efforts for the success of the 
business, and to afford them an opportunity to acquire a proprietary interest 
in the Company through stock options as provided herein.  Options granted 
under this Plan may be either incentive stock options ("Incentive Stock 
Options") within the meaning of Section 422 of the Internal Revenue Code of 
1986 (the "Code"), or options which do not qualify as Incentive Stock Options.

2.  STOCK SUBJECT TO PLAN.  Subject to the provisions of Section 12 hereof, 
the stock to be subject to options under the Plan shall be the Company's 
authorized common stock, no par value per share (the "Common Stock").  Such 
shares may be either authorized but unissued shares, or issued shares which 
have been reacquired by the Company.  Subject to adjustment as provided in 
Section 15 hereof, the maximum number of shares on which options may be 
exercised under this Plan shall be two million five hundred thousand 
(2,500,000) shares.  If an option under the Plan expires, or for any reason 
is terminated or unexercised with respect to any shares, such shares shall 
again be available for options thereafter granted during the term of the Plan.

3.  ADMINISTRATION OF PLAN.

    (a)  The Plan shall be administered by the Board of Directors of the 
Company or a committee thereof.  The members of any such committee shall be 
appointed by and serve at the pleasure of the Board of Directors.  (The group 
administering the Plan shall hereinafter be referred to as the "Committee".)
  
    (b)  The Committee shall have plenary authority in its discretion, but 
subject to the express provisions of the Plan:

                                       -1-
<PAGE>

          (i) to determine the purchase price of the Common Stock covered by
          each option,
          
          (ii) to determine the employees to whom and the time or times at
          which such options shall be granted and the number of shares to be
          subject to each,

          (iii) to determine the terms of exercise of each option,

          (iv) to accelerate the time at which all or any part of an option may
          be exercised,

          (v) to amend or modify the terms of any option with the consent of
          the optionee,

          (vi) to interpret the Plan,

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

          (viii) to determine the terms and provisions of each option agreement
          under the Plan (which agreements need not be identical), including
          the designation of those options intended to be Incentive Stock
          Options, and

          (ix) to make all other determinations necessary or advisable for the
          administration of the Plan, subject to the exclusive authority of the
          Board of Directors under Section 13 herein to amend or terminate the
          Plan.

The Committee's determinations on the foregoing matters, unless otherwise
disapproved by the Board of Directors of the Company, shall be final and
conclusive.

    (c)  The Committee shall select one of its members as its Chair and shall
hold its meetings at such times and places as it may determine.  A majority of
its members shall constitute a quorum.  All determinations of the Committee
shall be made by not less than a majority of its members.  Any decision or
determination reduced to writing and signed by all of the members of the
Committee shall be fully effective as if it had been made by a majority vote at
a meeting duly called and held.  The grant of an option shall be effective only
if a written agreement shall have been duly executed and delivered by and on
behalf of the Company following such grant.  The Committee may appoint a
Secretary and may make such rules and regulations for the conduct of its
business as it shall deem advisable.

4.  ELIGIBILITY.  Incentive Stock Options may only be granted under this Plan 
to any full or part-time employee (which term as used herein includes, but is 
not limited to, officers and directors who are also employees) of the


                                      -2-
<PAGE>


Company and of its present and future subsidiary corporations within the 
meaning of Section 424(f) of the Code (herein called "subsidiaries"). Full or 
part-time employees, consultants or independent contractors to the Company or 
one of its subsidiaries shall be eligible to receive options which do not 
qualify as Incentive Stock Options.  In determining the persons to whom 
options shall be granted and the number of shares subject to each, the 
Committee may take into account the nature of services rendered by the 
respective employees or consultants, their present and potential 
contributions to the success of the Company and such other factors as the 
Committee in its discretion shall deem relevant.  A person who has been 
granted an option under this Plan may be granted additional options under the 
Plan if the Committee shall so determine; provided, however, that for 
Incentive Stock Options granted after December 31, 1986, to the extent the 
aggregate fair market value (determined at the time the Incentive Stock 
Option is granted) of the Common Shares with respect to which all Incentive 
Stock Options are exercisable for the first time by an employee during any 
calendar year (under all plans described in subsection (d) of Section 422 of 
the Code of his employer corporation and its parent and subsidiary 
corporations) exceeds $100,000, such options shall be treated as options 
which do not qualify as Incentive Stock Options.  Nothing in the Plan or in 
any agreement thereunder shall confer on any employee any right to continue 
in the employ of the Company or any of its subsidiaries or affect, in any 
way, the right of the Company or any of its subsidiaries to terminate his or 
her employment at any time.

5.  PRICE.  The option price for all Incentive Stock Options granted under 
the Plan shall be determined by the Committee but shall not be less than 100% 
of the fair market value of the Common Shares at the date of grant of such 
option.  The option price for options granted under the Plan which do not 
qualify as Incentive Stock Options shall also be determined by the Committee. 
 For purposes of the preceding sentence and for all other valuation purposes 
under the Plan, the fair market value of the Common Shares shall be as 
reasonably determined in good faith by the Committee.

6.  TERM.  Each option and all rights and obligations thereunder shall  
expire on the date determined by the Committee and specified in the option 
agreement.  The Committee shall be under no duty to provide terms of like 
duration for options granted under the Plan, but the term of an Incentive 
Stock Option may not extend more than ten

                                           -3-
<PAGE>

(10) years from the date of grant of such option and the term of options 
granted under the Plan which do not qualify as Incentive Stock Options may 
not extend more than fifteen (15) years from the date of granting of such 
option.

7.  EXERCISE OF OPTION.

    (a)  The Committee shall have full and complete authority to determine 
whether an option will be exercisable in full at any time or from time to 
time during the term thereof, or to provide for the exercise thereof in such 
installments, upon the occurrence of such events (such as termination of 
employment for any reason) and at such times during the term of the option as 
the Committee may determine and specify in the option agreement.
  
   (b)  The exercise of any option granted hereunder shall only be effective 
at such time that the sale of Common Stock pursuant to such exercise will not 
violate any state or federal securities or other laws.
  
   (c)  An optionee electing to exercise an option shall give written notice 
to the Company of such election and of the number of shares subject to such 
exercise.  The full purchase price of such shares shall be tendered with such 
notice of exercise.  Payment shall he made to the Company in cash (including 
bank check, certified check, personal check, or money order), or, at the 
discretion of the Committee and as specified by the Committee,
  
          (i)  by delivering certificates for shares of Common Stock already
          owned by the optionee having a fair market value as of the date of
          grant equal to the full purchase price of the shares, or

          ii)  by delivering the optionee's promissory note, which shall
          provide for interest at a rate not less than the minimum rate
          required to avoid the imputation of income, original issue discount
          or a below-market-rate loan pursuant to Sections 483, 1274 or 7872 of
          the Code or any successor provisions thereto, or

          (iii)  by a combination of cash, shares and the optionee's promissory
          note.
          The fair market value of tendered shares shall be determined as
          provided in Section 5 herein.  The optionee's promissory note shall
          be a full recourse liability of the optionee and may, at the
          discretion of the Committee, be secured by a pledge of the shares
          being purchased.  Until such person has been issued the shares
          subject to such exercise, he or she shall possess no rights as a
          shareholder with respect to such shares.


                                          -4-
<PAGE>

8.  INCOME TAX WITHHOLDING AND TAX BONUSES.

    (a)  In order to comply with all applicable federal or state income tax 
laws or regulations, the Company may take such action as it deems appropriate 
to ensure that all applicable federal or state payroll, withholding, income 
or other taxes, which are the sole and absolute responsibility of an optionee 
under the Plan, are withheld or collected from such optionee.  In order to 
assist an optionee in paying all federal and state taxes to be withheld or 
collected upon exercise of an option which does not qualify as an Incentive 
Stock Option hereunder, the Committee, in its absolute discretion and subject 
to such additional terms and conditions as it may adopt, shall permit the 
optionee to satisfy such tax obligation by:
  
          (i)  electing to have the Company withhold a portion of the shares
          otherwise to be delivered upon exercise of such option with a fair
          market value, determined in accordance with Section 5 herein, equal
          to such taxes, or

          (ii)  delivering to the Company shares of Common Stock other than the
          shares issuable upon exercise of such option with a fair market
          value, determined in accordance with Section 5, equal to such taxes.

   (b)  The Committee shall have the authority, at the time of grant of an 
option under the Plan or at any time thereafter, to approve tax bonuses to 
designated optionees to be paid upon their exercise of options granted 
hereunder.  The amount of any such payments shall be determined by the 
Committee.  The Committee shall have full authority in its absolute 
discretion to determine the amount of any such tax bonus and the terms and 
conditions affecting the vesting and payment thereafter.

9.  ADDITIONAL RESTRICTIONS.  The Committee shall have full and complete 
authority to determine whether all or any part of the shares of Common Stock 
acquired upon exercise of any of the options granted under the Plan shall be 
subject to restrictions on the transferability thereof or any other 
restrictions affecting in any manner the optionee's rights with respect 
thereto, but any such restriction shall be contained in the agreement 
relating to such options.

10. TEN PERCENT SHAREHOLDER RULE.  Notwithstanding any other provision in the 
Plan, if at the time an option is otherwise to be granted pursuant to the 
Plan the optionee owns directly or indirectly (within the meaning of Section


                                     -5-
<PAGE>

424(d) of the Code) shares of Common Stock possessing more than ten percent 
(10%) of the total combined voting power of all classes of stock of the 
Company or its parent or subsidiary corporations, if any (within the meaning 
of Section 422(b)(6) of the Code), then any Incentive Stock Option to be 
granted to such optionee pursuant to the Plan shall satisfy the requirements 
of Section 422(c)(5) of the Code, and the option price shall be not less than 
110% of the fair market value of the shares of Common Stock determined as 
described herein, and such option by its terms shall not be exercisable after 
the expiration of five (5) years from the date such option is granted.

11. NON-TRANSFERABILITY.  No option granted under the Plan shall be 
transferable by an optionee, otherwise than by will or the laws of descent or 
distribution.  Except as otherwise provided in an option agreement, during 
the lifetime of an optionee, the option shall be exercisable only by such 
optionee.

12. DILUTION OR OTHER ADJUSTMENTS.  If there shall be any change in the 
Common Stock through merger, consolidation, reorganization, recapitalization, 
dividend in the form of stock (of whatever amount), stock split or other 
change in the Company's corporate structure, appropriate adjustments in the 
Plan and outstanding options shall be made by the Committee. In the event of 
any such changes, adjustments shall include, where appropriate, changes in 
the aggregate number of shares subject to the Plan, the number of shares and 
the price per share subject to outstanding options, in order to prevent 
dilution or enlargement of option rights.

13. AMENDMENT OR DISCONTINUANCE OF PLAN.  The Board of Directors may amend or 
discontinue the Plan at any time.  Subject to the provisions of Section 12, 
no amendment of the Plan shall without shareholder approval:

    (a)  increase the maximum number of shares under the Plan as provided in 
Section 2 herein,
  
    (b)  decrease the minimum price provided in Section 5 herein,
  
    (c)  extend the maximum term under Section 6, or
  
    (d)  modify the eligibility requirements for participation in the Plan.
  
The Board of Directors shall not alter or impair any option theretofore granted
under the Plan without the consent of the holder of the option.


                                      -6-
<PAGE>

14. TIME OF GRANTING.  Nothing contained in the Plan or in any resolution 
adopted or to be adopted by the Board of Directors or by the shareholders of 
the Company, and no action taken by the Committee or the Board of Directors 
(other than the execution and delivery of an option agreement), shall 
constitute the granting of an option hereunder.

15. EFFECTIVE DATE AND TERMINATION OF PLAN.

    (a)  The Plan was approved by the Board of Directors onNovember 21, 1994, 
and shall be approved by the shareholders of the Company within twelve (12) 
months thereof.
  
    (b)  Unless the Plan shall have been discontinued as provided in Section 
16 hereof, the Plan shall terminate November 20, 2004.  No option may be 
granted after such termination, but termination of the Plan shall not, 
without the consent of the optionee, alter or impair any rights or 
obligations under any option theretofore granted.

                                         -7-
<PAGE>

                       INCENTIVE STOCK OPTION AGREEMENT
                                       

     THIS AGREEMENT, made this  __ day of _________, 199_, by and between
Simulation Technologies Corp., a Minnesota corporation (the "Company"), and
___________________________________("Employee").

     WITNESSETH, THAT:

     WHEREAS, the Company pursuant to its 1994 Stock Option Plan wishes to
grant this stock option to Employee.

     NOW, THEREFORE, in consideration of the premises and of the mutual
covenants herein contained, the parties hereto hereby agree as follows:

     1.  GRANT OF OPTION.  The Company hereby grants to Employee, on the date 
set forth above, the right and option (hereinafter called "the option") to 
purchase all or any part of an aggregate of  _______ shares of the Company's 
Common Stock, no par value per share (the "Common Stock"), at the price of 
_______ (__) cents ($___) per share on the terms and conditions set forth 
herein.  This option is intended to be an incentive stock option within the 
meaning of Section 422 of the Internal Revenue Code of 1986, as amended (the 
"Code").
     
     2.  DURATION AND EXERCISABILITY
     
         (a) This option shall in all events terminate ten (10) years after 
the date of grant.  Subject to the terms and conditions set forth herein, 
this option may be exercised by Employee in cumulative installments as 
follows:


                                       -8-
<PAGE>

                                             Cumulative percentage
                    On or after each of      of shares as to which
                    the following dates      option is exercisable
                    -------------------      ---------------------

                                                    25%
                    -------------------             ---

                                                    25%
                    -------------------             ---

                                                    25%
                    -------------------             ---

                                                    25%
                    -------------------             ---


        (b) During the lifetime of Employee, the option shall be exercisable
only by Employee and shall not be assignable or transferable by Employee, other
than by will or the laws of descent and distribution.

        (c) Employee understands that to the extent that the aggregate fair
market value (determined at the time the option was granted) of the shares of
Common Stock with respect to which all options that are incentive stock options
within the meaning of Section 422 of the Code are exercisable for the first
time by Employee during any calendar year exceed $100,000, in accordance with
Section 422(d) of the Code, such options shall be treated as options that do
not qualify as incentive stock options.

     3. EFFECT OF TERMINATION OF EMPLOYMENT.
     
        (a) If Employee shall cease to be employed by the Company or its
subsidiaries, if any, for any reason other than Employee's serious misconduct
or Employee's death or disability (as such term is defined in Section 3(c)
hereof), Employee shall have the right to exercise the option at any time
within one (1) month after such termination of employment to the extent of the
full number of shares Employee was entitled to purchase under the option on the
date of termination, subject to the condition that no option shall be
exercisable after the expiration of the term of the option.

        (b)  If Employee shall cease to be employed by the Company or its
subsidiaries, if any, by reason of Employee's serious misconduct during the
course of employment, including but not limited to wrongful appropriation of
the Company's funds, the option shall be terminated as of the date of the
misconduct.

        (c)  If Employee shall die while in the employ of the Company or a
subsidiary, if any, or within one (1) month after termination of employment for
any reason other than serious misconduct or if employment is terminated because
Employee has become disabled (within the meaning of Code Section 22(e)(3))
while in the employ of the Company or a subsidiary, if any, and Employee shall
not have fully exercised the option, such option


                                    -9-
<PAGE>

may be exercised at any time within twelve (12) months after Employee's death 
or date of termination of employment for disability by Employee, personal 
representatives or administrators, or guardians of Employee, as applicable, 
or by any person or persons to whom the option is transferred by will or the 
applicable laws of descent and distribution, to the extent of the full number 
of shares Employee was entitled to purchase under the option on the date of 
death, termination of employment, if earlier, or date of termination for such 
disability and subject to the condition that no option shall be exercisable 
after the expiration of the term of the option.

     4. MANNER OF EXERCISE.
     
        (a)  The option can be exercised only by Employee or other proper party
by delivering within the option period written notice to the Company at its
principal office.  The notice shall state the number of shares as to which the
option is being exercised and be accompanied by payment in full of the option
price for all shares designated in the notice.

        (b)  Employee may pay the option price in cash, by check (bank check,
certified check or personal check), by money order, or with the approval of the
Company

            (i)  by delivering to the Company for cancellation shares of Common
        Stock with a fair market value as of the date of exercise equal to the
        option price or the portion thereof being paid by tendering such
        shares,
            
            (ii)  by delivering to the Company the full option price in a
        combination of cash and Employee's full recourse liability promissory
        note with a principal amount not to exceed eighty percent (80%) of the
        option price and a term not to exceed five (5) years, which promissory
        note shall provide for interest on the unpaid balance thereof which at
        all times is not less than the minimum rate required to avoid the
        imputation of income, original issue discount or a below-market rate
        loan pursuant to Sections 483, 1274 or 7872 of the Code or any
        successor provisions thereto or
            
            (iii) by delivering to the Company a combination of cash,
        Employee's promissory note and shares of Common Stock with an aggregate
        fair market value and a principal amount equal to the option price.
            
For these purposes, the fair market value of the Common Stock as of any date
shall be as reasonably determined by the Company pursuant to the Plan.


                                        -10-
<PAGE>

     5. MISCELLANEOUS.
     
       (a) This option is issued pursuant to the Company's 1994 Stock Option
Plan and is subject to its terms.  The terms of the Plan are available for
inspection during business hours at the principal offices of the Company.

       (b) This Agreement shall not confer on Employee any right with respect
to continuance of employment by the Company or any of its subsidiaries, nor
will it interfere in any way with the right of the Company to terminate such
employment at any time.  Employee shall have none of the rights of a
shareholder with respect to shares subject to this option until such shares
shall have been issued to Employee upon exercise of this option.

       (c) The exercise of all or any parts of this option shall only be
effective at such time that the sale of the shares of Common Stock pursuant to
such exercise will not violate any state or federal securities or other laws.

       (d) If there shall be any change in the Common Stock through merger,
consolidation, reorganization, recapitalization, dividend in the form of stock
(of whatever amount), stock split or other change in the Company's corporate
structure, and all or any portion of the option shall then be unexercised and
not yet expired, then appropriate adjustments in the outstanding option shall
be made by the Company, in order to prevent dilution or enlargement of option
rights.  Such adjustments shall include, where appropriate, changes in the
number of shares of Common Stock and the price per share subject to the
outstanding option.

       (e) The Company shall at all times during the term of the option
reserve and keep available such number of shares as will be sufficient to
satisfy the requirements of this Agreement.

       (f) If Employee shall dispose of any of the shares of Common Stock
acquired by Employee pursuant to the exercise of the option within two (2)
years from the date this option was granted or within one (1) year after the
transfer of any such shares to Employee upon exercise of this option, then, in
order to provide the Company with the opportunity to claim the benefit of any
income tax deduction which may be available to it under the circumstances,
Employee shall promptly notify the Company of the dates of acquisition and
disposition of such shares, the number of shares so disposed of, and the
consideration, if any, received for such shares.  In order to comply with all
applicable federal or state income tax laws or regulations, the Company may
take such action as it deems appropriate to insure:


                                       -11-
<PAGE>


            (i) notice to the Company of any disposition of the shares of
        Common Stock within the time periods described above and
            
            (ii) that, if necessary, all applicable federal or state payroll,
        withholding, income or other taxes are withheld or collected from
        Employee.
            


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


SIMULATION TECHNOLOGIES CORP.


By:    ___________________________
Name:  Richard Davenport
Its:   President


"EMPLOYEE"

______________________________


                                     -12-

<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 657,122 shares of your
Common Stock, $0.01 par value (the "Shares"), reserved for issuance pursuant to
the Simulation Technologies Corp. 1994 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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