QUICKTURN DESIGN SYSTEMS INC
S-8, 1997-04-18
INSTRUMENTS FOR MEAS & TESTING OF ELECTRICITY & ELEC SIGNALS
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<PAGE>

     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON APRIL 18, 1997.
                                                    REGISTRATION NO. 333-______ 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

                         SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, D.C. 20549

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

                          QUICKTURN DESIGN SYSTEMS, INC.
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)


               DELAWARE                             77-0159619
      ------------------------          -----------------------------------
      (STATE OF INCORPORATION)          (I.R.S. EMPLOYER IDENTIFICATION NO.)

                                440 Clyde Avenue
                        Mountain View, California 94043
   (ADDRESS, INCLUDING ZIP CODE, OF REGISTRANT'S PRINCIPAL EXECUTIVE OFFICES)


                            1997 STOCK OPTION PLAN
                 1993 EMPLOYEE QUALIFIED STOCK PURCHASE PLAN 
                           (FULL TITLE OF THE PLAN)

                                 Keith R. Lobo
                    President and Chief Executive Officer
                        Quickturn Design Systems, Inc.
                                440 Clyde Avenue
                        Mountain View, California 94043
                                (415) 967-3300
(NAME, ADDRESS, AND TELEPHONE NUMBER, INCLUDING AREA CODE, OF AGENT FOR SERVICE)

                                  COPIES TO:
                           HERBERT P. FOCKLER, ESQ.
                      WILSON SONSINI GOODRICH & ROSATI
                           PROFESSIONAL CORPORATION
                              650 PAGE MILL ROAD
                           PALO ALTO, CA 94304-1050
                                (415) 493-9300

<TABLE>
<CAPTION>
                         CALCULATION OF REGISTRATION FEE
- -----------------------------------------------------------------------------------------------------
- -----------------------------------------------------------------------------------------------------
                                                     PROPOSED         PROPOSED     
                                                     MAXIMUM          MAXIMUM           AMOUNT OF  
TITLE OF SECURITIES           AMOUNT TO BE        OFFERING PRICE      AGGREGATE       REGISTRATION 
 TO BE REGISTERED             REGISTERED(1)        PER SHARE(2)     OFFERING PRICE        FEE      
- -----------------------------------------------------------------------------------------------------
<S>                           <C>                 <C>               <C>               <C>
Common Stock, $.001 par
value. . . . . . . . . . .      1,750,000             $7.125        $12,468,750.00      $3,778.41

- -----------------------------------------------------------------------------------------------------
- -----------------------------------------------------------------------------------------------------
</TABLE>
(1)  Includes 1,000,000 shares to be registered in connection with the 1997
     Stock Option Plan and 750,000 shares to be registered in connection with
     the 1993 Employee Qualified Stock Purchase Plan.
(2)  With respect to (i) 1,000,000 shares of Common Stock available for future
     grant under the 1997 Plan and (ii) 750,000 shares of Common Stock available
     for future grant under the 1993 Employee Qualified Stock Purchase Plan, the
     estimated Proposed Maximum Offering Price Per Share was estimated pursuant
     to Rule 457(c) whereby the per share price was determined by reference to
     the average between the high and low price reported in the Nasdaq National
     Market on April 16, 1997, which average was $7.125. 
                                                                                
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

<PAGE>

                         QUICKTURN DESIGN SYSTEMS, INC.

                       REGISTRATION STATEMENT ON FORM S-8


                                     PART I

                     INFORMATION REQUIRED IN THE PROSPECTUS

ITEM 1.        PLAN INFORMATION.

     Omitted pursuant to the instructions and provisions of Form S-8.

ITEM 2.        REGISTRATION INFORMATION AND EMPLOYEE PLAN ANNUAL INFORMATION.

     Omitted pursuant to the instructions and provisions of Form S-8.

                                     PART II

                 INFORMATION REQUIRED IN REGISTRATION STATEMENT

ITEM 3.   INCORPORATION OF DOCUMENTS BY REFERENCES.

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

     (1)  The Registrant's Annual Report on Form 10-K under the Securities
Exchange Act of 1934 (the "Exchange Act") for the fiscal year ended December 31,
1996.

     (2)  The description of the Registrant's Common Stock contained in the
Registrant's Registration Statement on Form 8-A dated October 29, 1993 (File No.
0-22738) filed pursuant to Section 12(g) of the Exchange Act and declared
effective in December 1993, including any amendment or report filed for the
purpose of updating such description.

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

ITEM 4.   DESCRIPTION OF SECURITIES.

     Not applicable.


ITEM 5.   INTERESTS OF NAMED EXPERTS AND COUNSEL.

     None.


                                      II-1
<PAGE>

ITEM 6.    INDEMNIFICATION OF DIRECTORS AND OFFICERS.

     The Registrant's Certificate of Incorporation limits the liability of
directors for monetary damages to the maximum extent permitted by Delaware law. 
Delaware law provides that directors of a corporation will not be personally
liable 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
that 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 Registrant's Bylaws provide that the Registrant shall indemnify its
directors and executive officers and may indemnify its other officers,
employees, agents and other agents to the fullest extent permitted by law.  The
Registrant believes that indemnification under its Bylaws covers at least
negligence and gross negligence on the part of indemnified parties.  The
Registrant's Bylaws also permit the Registrant to secure insurance on behalf of
any officer, director, employee or other agent for any liability arising out of
his or her actions in such capacity, regardless of whether the Bylaws would
permit indemnification.

     The Registrant has entered into agreements to indemnify its directors and
officers, in addition to indemnification provided for in the Registrant's
Bylaws.  These agreements, among other things, indemnify the Registrant's
directors and officers for certain expenses (including attorneys' 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 Registrant,
arising out of such person's services as a director or officer of the
Registrant, any subsidiary of the Registrant or any other company or enterprise
to which the person provides services at the request of the Registrant.

     The Registrant also maintains an insurance policy insuring its directors
and officers against liability for certain acts and omissions while acting in
their official capacities.

ITEM 7.   EXEMPTION FROM REGISTRATION CLAIMED.

     Not applicable.

ITEM 8.   EXHIBITS.

         Exhibit
         Number                 Description                    
         -------                -----------
           4.1      1997 Stock Option Plan
           4.2      1993 Employee Qualified Stock Purchase Plan
           5.1      Opinion of counsel as to legality of securities being
                    registered
          23.1      Consent of counsel (contained in Exhibit 5.1)
          23.2      Consent of Independent Accountants
          24.1      Powers of Attorney (see page II-5)



                                   II-2

<PAGE>

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. Notwithstanding the foregoing, any increase or 
decrease in volume of securities offered (if the total dollar value of 
securities offered would not exceed that which was registered) and any 
deviation from the low or high end of the estimated maximum offering range 
may be reflected in the form of prospectus filed with the Commission pursuant 
to Rule 424(b) if, in the aggregate, the changes in volume and price 
represent no more than a 20% change in the maximum aggregate offering price 
set forth in the "Calculation of Registration Fee" table in the effective 
Registration Statement.

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

          PROVIDED, HOWEVER, that paragraphs (a)(1)(i) and (a)(1)(ii) do not 
apply if the information required to be included in a post-effective 
amendment by those paragraphs is contained in periodic reports filed by the 
Registrant pursuant to section 13 or section 15(d) of the Securities Exchange 
Act of 1934 that are incorporated by reference in this Registration Statement.
    
    (2)   That, for the purpose of determining any liability under the 
Securities Act of 1933, each such post-effective amendment shall be deemed to 
be a new registration statement relating to the securities offered therein, 
and the offering of such securities at that time shall be deemed to be the 
initial bona fide offering thereof.
    
    (3)   To remove from registration by means of a post-effective amendment 
any of the securities being registered which remain unsold at the termination 
of the offering.

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

(h) 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 


                                 II-3

<PAGE>

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.


                                 II-4

<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 Mountain View, State of California, on this 11th day
of April, 1997.
                                 QUICKTURN DESIGN SYSTEMS, INC.            

                                 By: /s/ RAYMOND K. OSTBY                 
                                    ----------------------------------------
                                         Raymond K. Ostby
                                         Vice President, Finance and 
                                         Administration, Chief Financial 
                                         Officer and Secretary


                            POWER OF ATTORNEY

     KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature
appears below constitutes and appoints Keith R. Lobo and Raymond K. Ostby,
jointly and severally, as his attorneys-in-fact, each with the power of
substitution, for him in any and all capacities to sign any amendments to this
Registration Statement on Form S-8, and to file the same, with exhibits thereto
and other documents in connection therewith, with the Securities and Exchange
Commission, hereby ratifying and confirming all that each of said attorney-in-
fact, or his substitute or substitutes, may do or cause to be done by virtue
hereof.

     Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed below by the following persons on the
11th day of April, 1997 in the capacities indicated.


         SIGNATURE                             TITLE
- ---------------------------   ------------------------------------------


/s/ KEITH R. LOBO             President, Chief Executive Officer and  
- ---------------------------   Director (PRINCIPAL EXECUTIVE OFFICER)  
  Keith R. Lobo


                              Vice President, Finance and        
/s/ RAYMOND K. OSTBY          Administration, Chief Financial    
- ---------------------------   Officer and Secretary (PRINCIPAL   
  Raymond K. Ostby            FINANCIAL AND ACCOUNTING OFFICER)


/s/ GLEN M. ANTLE          
- ---------------------------   Chairman of the Board of Directors
  Glen M. Antle


/s/ RICHARD C. ALBERDING   
- ---------------------------   Director
  Richard C. Alberding


/s/ MICHAEL R. D'AMOUR     
- ---------------------------   Director
  Michael R. D'Amour


/s/ YEN-SON HUANG          
- ---------------------------   Director
  Yen-Son (Paul) Huang


/s/ DAVID K. LAM           
- ---------------------------   Director
  David K. Lam




                                      II-5
<PAGE>

                                INDEX TO EXHIBITS


           Exhibit                     
           Number                 Description 
           -------                -----------
             4.1     1997 Stock Option Plan
             4.2     1993 Employee Qualified Stock Purchase Plan
             5.1     Opinion of counsel as to legality of securities being
                      registered
            23.1     Consent of counsel (contained in Exhibit 5.1)
            23.2     Consent of Independent Accountants
            24.1     Powers of Attorney (see page II-5)




<PAGE>

                                                                 EXHIBIT 4.1


                         QUICKTURN DESIGN SYSTEMS, INC.

                             1997 STOCK OPTION PLAN



    1.  PURPOSES OF THE PLAN.  The purposes of this 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 may be Incentive Stock Options or
Nonstatutory Stock Options, as determined by the Administrator at the time of
grant.

    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 Quickturn Design Systems, 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.

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


<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 and Directors,
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. 
For purposes of Incentive Stock Options, no such leave may exceed ninety days,
unless reemployment upon expiration of such leave is guaranteed by statute or
contract.  If reemployment upon expiration of a leave of absence approved by the
Company is not so guaranteed, on the 181st day of such leave any Incentive Stock
Option held by the Optionee shall cease to be treated as an Incentive Stock
Option and shall be treated for tax purposes as a Nonstatutory Stock Option. 
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, the Fair Market
Value of a Share of Common Stock 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; or 

            (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) "INCENTIVE STOCK OPTION" means an Option intended to qualify as an
incentive stock option within the meaning of Section 422 of the Code and the
regulations promulgated thereunder.

        (o) "NONSTATUTORY STOCK OPTION" means an Option not intended to qualify
as an Incentive Stock Option.


                                     -2-

<PAGE>

        (p) "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.

        (q) "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.

        (r) "OPTION" means a stock option granted pursuant to the Plan.

        (s) "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.

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

        (u) "OPTIONED STOCK" means the Common Stock subject to an Option or
Stock Purchase Right.

        (v) "OPTIONEE" means the holder of an outstanding Option or Stock
Purchase Right granted under the Plan.

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

        (x) "PLAN" means this 1997 Stock Option Plan.

        (y) "RULE 16b-3" means Rule 16b-3 of the Exchange Act or any successor
to Rule 16b-3, as in effect when discretion is being exercised with respect to
the Plan.

        (z) "SECTION 16(b)" means Section 16(b) of the Exchange Act.

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

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

        (ac)  "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 1,000,000 Shares.  The Shares may be authorized, but unissued,
or reacquired Common Stock.  


                                     -3-

<PAGE>

        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); PROVIDED,
however, that Shares that have actually been issued under the Plan shall not be
returned to the Plan and shall not become available for future distribution
under the Plan.

    4.  ADMINISTRATION OF THE PLAN.

        (a) PROCEDURE.

            (i) MULTIPLE ADMINISTRATIVE BODIES.  The Plan may be administered
by different Committees with respect to different groups of Service Providers.

            (ii)    SECTION 162(m). To the extent that the Administrator
determines it to be desirable to qualify Options granted hereunder as
"performance-based compensation" within the meaning of Section 162(m) of the
Code, the Plan shall be administered by a Committee of two or more "outside
directors" within the meaning of Section 162(m) of the Code.

            (iii)   RULE 16b-3.  To the extent desirable to qualify transactions
hereunder as exempt under Rule 16b-3, the transactions contemplated hereunder
shall be structured to satisfy the requirements for exemption under Rule 16b-3.

            (iv)    OTHER ADMINISTRATION.  Other than as provided above, the
Plan shall be administered by (A) the Board or (B) 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:

            (i)   to determine the Fair Market Value;

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

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

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

            (v)   to determine the terms and conditions, not inconsistent
with the terms of the Plan, of any Option 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 


                                     -3-

<PAGE>

regarding any Option of the shares of Common Stock relating thereto, based in 
each case on such factors as the Administrator, in its sole discretion, shall 
determine;

            (vi)  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;

            (vii)  to institute an Option Exchange Program;

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

            (ix)   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;

            (x)    to modify or amend each Option (subject to Section 14(c) 
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;

            (xi)   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;

            (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;

            (xiii) 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.  Nonstatutory Stock Options may be granted to Service
Providers.  Incentive Stock Options may be granted only to Employees.


                                     -5-

<PAGE>

    6.  LIMITATIONS.

        (a) Each Option shall be designated in the Option Agreement as either
an Incentive Stock Option or a Nonstatutory Stock Option.  However,
notwithstanding such designation, to the extent that the aggregate Fair Market
Value of the Shares with respect to which Incentive Stock Options are
exercisable for the first time by the Optionee during any calendar year (under
all plans of the Company and any Parent or Subsidiary) exceeds $100,000, such
Options shall be treated as Nonstatutory Stock Options.  For purposes of this
Section 6(a), Incentive Stock Options shall be taken into account in the order
in which they were granted.  The Fair Market Value of the Shares shall be
determined as of the time the Option with respect to such Shares is granted.

        (b) 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.

        (c) The following limitations shall apply to grants of Options:

            (i)   No Service Provider shall be granted, in any fiscal year of 
the Company, Options to purchase more than 200,000 Shares.

            (ii)  In connection with his or her initial service, a Service 
Provider may be granted Options to purchase up to an additional 100,000 
Shares which shall not count against the limit set forth in subsection (i) 
above.

            (iii) The foregoing limitations shall be adjusted proportionately 
in connection with any change in the Company's capitalization as described in 
Section 12. 

            (iv)  If an Option is cancelled in the same fiscal year of the 
Company in which it was granted (other than in connection with a transaction 
described in Section 12), the cancelled Option will be counted against the 
limits set forth in subsections (i) and (ii) above.  For this purpose, if the 
exercise price of an Option is reduced, the transaction will be treated as a 
cancellation of the Option and the grant of a new Option.

    7.  TERM OF PLAN.  Subject to Section 18 of the Plan, the Plan shall 
become effective upon its adoption by the Board.  It shall continue in effect 
for a term of ten (10) years unless terminated earlier under Section 14 of 
the Plan.

    8.  TERM OF OPTION.  The term of each Option shall be stated in the 
Option Agreement.  In the case of an Incentive Stock Option, the term shall 
be ten (10) years from the date of grant or such shorter term as may be 
provided in the Option Agreement.  Moreover, in the case of an Incentive 
Stock Option granted to an Optionee who, at the time the Incentive Stock 
Option is granted, owns 


                                     -6-

<PAGE>

stock representing more than ten percent (10%) of the total combined voting 
power of all classes of stock of the Company or any Parent or Subsidiary, the 
term of the Incentive Stock Option shall be five (5) years from the date of 
grant or such shorter term as may be provided 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, subject to the following:

            (i) In the case of an Incentive Stock Option

                (A)  granted to an Employee who, at the time the Incentive
Stock Option is granted, owns stock representing more than ten percent (10%) of
the voting power of all classes of stock of the Company or any Parent or
Subsidiary, the per Share exercise price shall be no less than 110% of the Fair
Market Value per Share on the date of grant.

                (B)  granted to any Employee other than an Employee
described in paragraph (A) immediately above, the per Share exercise price shall
be no less than 100% of the Fair Market Value per Share on the date of grant.

            (ii) In the case of a Nonstatutory Stock Option, the per
Share exercise price shall be determined by the Administrator.  In the case of a
Nonstatutory Stock Option intended to qualify as "performance-based
compensation" within the meaning of Section 162(m) of the Code, the per Share
exercise price shall be no less than 100% of the Fair Market Value per Share on
the date of grant.

            (iii)  Notwithstanding the foregoing, Options may be granted with a
per Share exercise price of less than 100% of the Fair Market Value per Share on
the date of grant pursuant to a merger or other corporate transaction.

        (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. 

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

            (i)    cash;

            (ii)   check;



                                     -7-

<PAGE>

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

            (vi)   a reduction in the amount of any Company liability to the 
Optionee, including any liability attributable to the Optionee's 
participation in any Company-sponsored deferred compensation program or 
arrangement;

            (vii)  any combination of the foregoing methods of payment; or

            (viii) such other consideration and method of payment for the 
issuance of Shares to the extent permitted by Applicable Laws.

    10. EXERCISE OF OPTION.

        (a) PROCEDURE FOR EXERCISE; RIGHTS AS A SHAREHOLDER. 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.  Unless the Administrator provides 
otherwise, vesting of Options granted hereunder shall be tolled during any 
unpaid leave of absence. 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 
shareholder shall exist with respect to the Optioned Stock, notwithstanding 
the 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.


                                     -8-

<PAGE>

            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 within such 
period of time as is specified in the Option Agreement 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 three (3) 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 by the Administrator, the Option 
shall terminate, and the Shares covered by such Option shall revert to the 
Plan.

        (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 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.


                                     -9-

<PAGE>

    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 
shareholders 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 Administrator in its discretion may provide for an 
Optionee to 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, the Administrator may provide that any Company repurchase option 
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 


                                     -10-

<PAGE>

writing or electronically that the Option shall be fully vested and 
exercisable for a period of fifteen (15) 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 subject to the 
Option 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 subject to 
the Option, 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) SHAREHOLDER APPROVAL.  The Company shall obtain shareholder 
approval of any Plan amendment to the extent necessary and desirable to 
comply with Applicable Laws. 

        (c) 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 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.


                                     -11-

<PAGE>

        (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. SHAREHOLDER APPROVAL.  The Plan shall be subject to approval by the
shareholders of the Company within twelve (12) months after the date the Plan is
adopted.  Such shareholder approval shall be obtained in the manner and to the
degree required under Applicable Laws.


                                     -12-

<PAGE>


                             1997 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:                  ___       Incentive Stock Option

                                     ___       Nonstatutory Stock Option

    Term/Expiration Date:            _________________________


     VESTING SCHEDULE:

    This Option may be exercised, in whole or in part, in accordance with the
following schedule:

    [25% OF THE SHARES SUBJECT TO THE OPTION SHALL VEST TWELVE MONTHS AFTER THE
VESTING COMMENCEMENT DATE, AND 1/48 OF THE SHARES SUBJECT TO THE OPTION SHALL
VEST EACH MONTH THEREAFTER, SUBJECT TO THE OPTIONEE CONTINUING TO BE A SERVICE
PROVIDER ON SUCH DATES].



<PAGE>

    TERMINATION PERIOD:

    This Option may be exercised for _____ [DAYS/MONTHS] 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(c) 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.

        If designated in the Notice of Grant as an Incentive Stock Option 
("ISO"), this Option is intended to qualify as an Incentive Stock Option 
under Section 422 of the Code.  However, if this Option is intended to be an 
Incentive Stock Option, to the extent that it exceeds the $100,000 rule of 
Code Section 422(d) it shall be treated as a Nonstatutory Stock Option 
("NSO").

    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 [TITLE] 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.



                                     -2-

<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; or

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

    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.

            (i)   NONSTATUTORY STOCK OPTION.  The Optionee may incur regular 
federal income tax liability upon exercise of a 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.

            (ii)  INCENTIVE STOCK OPTION.  If this Option qualifies as an
ISO, the Optionee will have no regular federal income tax liability upon its
exercise, although the excess, if any, of the Fair Market Value of the Exercised
Shares on the date of exercise over their aggregate Exercise Price will be
treated as an adjustment to alternative minimum taxable income for federal tax
purposes and may subject the Optionee to alternative minimum tax in the year of
exercise.  In the event that the Optionee ceases to be an Employee but remains a
Service Provider, any Incentive Stock Option of the 


                                     -3-

<PAGE>

Optionee that remains unexercised shall cease to qualify as an Incentive 
Stock Option and will be treated for tax purposes as a Nonstatutory Stock 
Option on the date three (3) months and one (1) day following such change of 
status.

        (b) DISPOSITION OF SHARES.  

            (i)   NSO.  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.

            (ii)  ISO.  If the Optionee holds ISO Shares for at least one 
year after exercise and two years after the grant date, any gain realized on 
disposition of the Shares will be treated as long-term capital gain for 
federal income tax purposes.  If the Optionee disposes of ISO Shares within 
one year after exercise or two years after the grant date, any gain realized 
on such disposition will be treated as compensation income (taxable at 
ordinary income rates) to the extent of the excess, if any, of the lesser of 
(A) the difference between the Fair Market Value of the Shares acquired on 
the date of exercise and the aggregate Exercise Price, or (B) the difference 
between the sale price of such Shares and the aggregate Exercise Price.  Any 
additional gain will be taxed as capital gain, short-term or long-term 
depending on the period that the ISO Shares were held.

        (c) NOTICE OF DISQUALIFYING DISPOSITION OF ISO SHARES.  If the 
Optionee sells or otherwise disposes of any of the Shares acquired pursuant 
to an ISO on or before the later of (i) two years after the grant date, or 
(ii) one year after the exercise date, the Optionee shall immediately notify 
the Company in writing of such disposition.  The Optionee agrees that he or 
she may be subject to income tax withholding by the Company on the 
compensation income recognized from such early disposition of ISO Shares by 
payment in cash or out of the current earnings paid to the Optionee.

    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, 


                                     -4-

<PAGE>

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:                          QUICKTURN DESIGN SYSTEMS, INC.



_____________________________      _______________________________________
Signature                          By

_____________________________      ______________________________________
Print Name                         Title

_____________________________
Residence Address

_____________________________




                                     -5-

<PAGE>

                                CONSENT OF SPOUSE

    The undersigned spouse of Optionee has read and hereby approves the terms
and conditions of the Plan and this Option Agreement.  In consideration of the
Company's granting his or her spouse the right to purchase Shares as set forth
in the Plan and this Option Agreement, the undersigned hereby agrees to be
irrevocably bound by the terms and conditions of the Plan and this Option
Agreement and further agrees that any community property interest shall be
similarly bound.  The undersigned hereby appoints the undersigned's spouse as
attorney-in-fact for the undersigned with respect to any amendment or exercise
of rights under the Plan or this Option Agreement.
            
                              _______________________________________
                              Spouse of Optionee



                                     -6-

<PAGE>

                                   EXHIBIT A

                             1997 STOCK OPTION PLAN

                                 EXERCISE NOTICE


Quickturn Design Systems, Inc.
440 Clyde Avenue
Mountain View, CA  94043


Attention:  [TITLE]

    1.  EXERCISE OF OPTION.  Effective as of today, ________________, 199__, 
the undersigned ("Purchaser") hereby elects to purchase ______________ shares 
(the "Shares") of the Common Stock of Quickturn Design Systems, Inc. (the 
"Company") under and pursuant to the 1997 Stock Option Plan (the "Plan") and 
the Stock Option Agreement dated __________________, 19___ (the "Option 
Agreement").  The purchase price for the Shares shall be $______________, 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 SHAREHOLDER.  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 shareholder 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 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 



<PAGE>

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:                              QUICKTURN DESIGN SYSTEMS, INC.


__________________________________      _____________________________________
Signature                               By

__________________________________      _____________________________________
Print Name                              Its


ADDRESS:                                ADDRESS:

_________________________________       Quickturn Design Systems, Inc.
_________________________________       440 Clyde Avenue
                                        Mountain View, CA  94043

                                        _____________________________________
                                        Date Received



                                     -2-



<PAGE>


                        QUICKTURN DESIGN SYSTEMS, INC.

                  1993 EMPLOYEE QUALIFIED STOCK PURCHASE PLAN

                    (AS AMENDED THROUGH FEBRUARY 11, 1997)



    The following constitute the provisions of the 1993 Employee Qualified
Stock Purchase Plan (herein called the "Plan") of Quickturn Design Systems, Inc.
(herein called the "Company").

    1.   PURPOSE.  The purpose of the Plan is to provide employees of the
Company and its Designated Subsidiaries with an opportunity to purchase Common
Stock of the Company through accumulated payroll deductions.  It is the
intention of the Company to have the Plan qualify as an "Employee Stock Purchase
Plan" under Section 423 of the Internal Revenue Code of 1986, as amended.  The
provisions of the Plan shall, accordingly, be construed so as to extend and
limit participation in a manner consistent with the requirements of that section
of the Code.

    2.   DEFINITIONS.

         (a)  "BOARD" shall mean the Board of Directors of the Company.

         (b)  "CODE" shall mean the Internal Revenue Code of 1986, as amended.

         (c)  "COMMON STOCK" shall mean the Common Stock, $.001 par value per
share, of the Company.

         (d)  "COMPANY" shall mean Quickturn Design Systems, Inc., a Delaware
corporation, and any Designated Subsidiary of the Company.

         (e)  "COMPENSATION" shall mean all regular straight time earnings,
overtime, shift premiums, all bonuses paid pursuant to the formal Bonus Plan
sponsored by the Company, and commissions, but shall exclude incentive
compensation, incentive payments or other extraordinary compensation.

         (f)  "DESIGNATED SUBSIDIARIES" shall mean the Subsidiaries which have
been designated by the Board from time to time in its sole discretion as
eligible to participate in the Plan.

         (g)  "EMPLOYEE" shall mean any individual who is an employee of the
Company for purposes of tax withholding under the Code whose customary
employment with the Company or any Designated Subsidiary is at least twenty (20)
hours per week and more than five (5) months in any calendar year.  For purposes
of the Plan, the employment relationship shall be treated as 

<PAGE>

continuing intact while the individual is on sick leave or other leave of 
absence approved by the Company.  Where the period of leave exceeds 90 days 
and the individual's right to reemployment is not guaranteed either by 
statute or by contract, the employment relationship will be deemed to have 
terminated on the 91st day of such leave.

         (h)  "EXERCISE DATE" shall mean the date one day prior to the date six
months, twelve months, eighteen months or twenty-four months after the Offering
Date of each Offering Period.

         (i)  "EXERCISE PERIOD" shall mean a period commencing on an Offering
Date or on the day after an Exercise Date and terminating one day prior to the
date six (6) months later.

         (j)  "OFFERING PERIOD" shall mean a period of approximately 
twenty-four (24) months consisting of four approximately six-month Exercise 
Periods during which options granted pursuant to the Plan may be exercised.

         (k)  "OFFERING DATE" shall mean the first day of each Offering Period
of the Plan.

         (l)  "PLAN" shall mean this 1993 Employee Qualified Stock Purchase
Plan.

         (m)  "SUBSIDIARY" shall mean a corporation, domestic or foreign, of
which not less than 50% of the voting shares are held by the Company or a
Subsidiary, whether or not such corporation now exists or is hereafter organized
or acquired by the Company or a Subsidiary.

         (n)  "TRADING DAY" shall mean a day on which national stock exchanges
and the National Association of Securities Dealers Automated Quotation (NASDAQ)
System are open for trading.

    3.   ELIGIBILITY.

         (a)  Any Employee as defined in paragraph 2 who shall be employed by
the Company at least 30 days prior to the Offering Date shall be eligible to
participate in the Plan, subject to limitations imposed by Section 423(b) of the
Code.

         (b)  Any provisions of the Plan to the contrary notwithstanding, no
Employee shall be granted an option under the Plan (i) if, immediately after the
grant, such Employee (or any other person whose stock would be attributed to
such Employee pursuant to Section 424(d) of the Code) would own stock and/or
hold outstanding options to purchase stock possessing five percent (5%) or more
of the total combined voting power or value of all classes of stock of the
Company or of any subsidiary of the Company, or (ii) which permits his rights to
purchase stock under all employee stock purchase plans of the Company and its
subsidiaries to accrue at a rate which exceeds Twenty-Five Thousand Dollars
($25,000) of fair market value of such stock 

                                       -2-

<PAGE>

(determined at the time such option is granted) for each calendar year in 
which such option is outstanding at any time.

    4.   OFFERING PERIODS.  

         (a) GENERAL RULE.  The plan shall be implemented by consecutive and
overlapping Offering Periods of approximately twenty-four months, with a new
Offering Period beginning every six months.  

         (b) THE FIRST OFFERING PERIOD.  The first Offering Period shall begin
on the effective date of the Company's initial public offering of its Common
Stock that is registered with the Securities and Exchange Commission and end
approximately twenty-six months later, on February 17, 1996, if a Trading Day,
or the last Trading Day prior thereto.  The first Exercise Date shall be the
last Trading Day on or before August 17, 1994.  Subsequent Exercise Dates in the
First Offering Period shall be the last Trading Days on or before February 17,
1995, August 17, 1995, and February 17, 1996.  

         (c) SUBSEQUENT OFFERING PERIODS.  The second Offering Period shall
begin on the first Trading Day on or after August 18, 1994. Subsequent Offering
Periods shall begin on the first Trading Day on or after February 18 and August
18 of each year and shall end on the last Trading Day on or before February 17
or August 17, twenty-four months later.  The Plan shall continue until
terminated in accordance with paragraph 20 hereof.  Subject to the requirements
of paragraph 20, the Board of Directors of the Company shall have the power to
change the commencement, termination and duration of Offering Periods with
respect to future offerings without stockholder approval if such change is
announced at least fifteen (15) days prior to the scheduled beginning of the
first Offering Period to be affected.

    5.   PARTICIPATION.

         (a)  An eligible Employee may become a participant in the Plan by
completing a subscription agreement authorizing payroll deductions on a form
provided by the Company and filing it with the Company's payroll office at least
ten (10) business days prior to the applicable Offering Date, unless a later
time for filing the subscription agreement is set by the Board for all eligible
Employees with respect to a given offering.  For the first Offering Period under
the Plan , subscription agreements must be submitted by the close of business on
December 8, 1993.

         (b)  Payroll deductions for a participant shall commence on the first
payroll following the Offering Date and shall end on the Exercise Date of the
offering to which such authorization is applicable, unless sooner terminated by
the participant as provided in paragraph 11.

                                       -3-

<PAGE>

    6.   PAYROLL DEDUCTIONS.

         (a)  At the time a participant files his subscription agreement, he
shall elect to have payroll deductions made on each payday during the Offering
Period in an amount not exceeding ten percent (10%) of his or her Compensation. 
The aggregate of such payroll deductions during any Offering Period shall not
exceed ten percent (10%) of his aggregate Compensation during said Offering
Period.

         (b)  All payroll deductions made by a participant shall be credited to
his or her account under the Plan and will be withheld in whole percentages
only.  A participant may not make any additional payments into such account.

         (c)  A participant may discontinue his or her participation in the
Plan as provided in paragraph 11, or may increase or decrease the rate or amount
of his or her payroll deductions during the Offering Period (within the
limitations of Section 6(a)) by completing and filing with the Company a new
subscription agreement authorizing a decrease in the rate or amount of payroll
deductions; provided, however, that a participant may not decrease the rate or
amount of his or her payroll deductions more than once in any one month.  The
change in rate shall be effective fifteen (15) days following the Company's
receipt of the new authorization or such shorter period as may be permitted by
the Company.  Subject to the limitations of Section 6(a), a participant's
subscription agreement shall remain in effect for successive Offering Periods
unless revised as provided herein or terminated as provided in paragraph 11.

         (d)  Notwithstanding the foregoing, to the extent necessary to comply
with Section 423(b)(8) of the Code and paragraph 3(b) herein, a participant's
payroll deductions may be decreased to 0% at such time during any Exercise
Period which is scheduled to end during the current calendar year that the
aggregate of all payroll deductions accumulated with respect to such Exercise
Period and any other Exercise Period ending within the same calendar year equal
$21,250.  Payroll deductions shall recommence at the rate provided in such
participant's subscription agreement at the beginning of the first Exercise
Period which is scheduled to end in the following calendar year, unless
terminated by the participant as provided in paragraph 11.

         (e)  At the time the option is exercised, in whole or in part, or at
the time some or all of the Company's Common Stock issued under the Plan is
disposed of, the participant must make adequate provision for the Company's
federal, state, or other tax withholding obligations, if any, which arise upon
the exercise of the option or the dispositions, if any, which arise upon the
exercise of the option or the disposition of the Common Stock.  At any time, the
Company may, but will not be obligated to, withhold from the participant's
compensation the amount necessary for the Company to meet applicable withholding
obligations, including any withholding required to make available to the Company
any tax deductions or benefits attributable to sale or early disposition
of Common Stock by the Employee.

    7.   GRANT OF OPTION.

                                       -4-

<PAGE>

         (a)  On the Offering Date of each Offering Period, each eligible
Employee participating in such Offering Period shall be granted an option to
purchase on each Exercise Date during such Offering Period (at the per share
option price) up to a number of shares of the Company's Common Stock determined
by dividing such Employee's payroll deductions accumulated prior to such
Exercise Date and retained in the Participant's account as of the Exercise Date
by the lower of (i) eighty-five percent (85%) of the fair market value of a
share of the Company's Common Stock on the Offering Date or (ii) eighty-five
percent (85%) of the fair market value of a share of the Company's Common Stock
on the Exercise Date; provided, however, that the maximum number of Shares an
Employee may purchase during each Offering Period shall be determined at the
Offering Date by dividing $50,000 by the fair market value of a share of the
Company's Common Stock on the Offering Date, and provided further that such
purchase shall be subject to the limitations set forth in Section 3(b) and 13
hereof.  Exercise of each option during the Offering Period shall occur as
provided in Section 8, unless the participant has withdrawn pursuant to Section
11, and each option shall expire at midnight on the last day of the applicable
Exercise Period.  Fair market value of a share of the Company's Common Stock
shall be determined as provided in Section 7(b) herein.

         (b)  The option price per share of the shares offered in a given
Exercise Period shall be the lower of:  (i) 85% of the fair market value of a
share of the Common Stock of the Company on the Offering Date; or (ii) 85% of
the fair market value of a share of the Common Stock of the Company on the
Exercise Date.  The fair market value of the Company's Common Stock on a given
date shall be determined by the Board in its discretion.  However, except as
provided below, where there is a public market for the Common Stock, the fair
market value per share shall be the closing price of the Common Stock for such
date, as reported by the NASDAQ National Market System, or, in the event the
Common Stock is listed on a stock exchange, the fair market value per share
shall be the closing price on such exchange on such date, as reported in THE
WALL STREET JOURNAL.  For purposes of the Offering Date under the first Offering
Period under the Plan, the fair market value of the Common Stock shall be the
"price to public" as set forth in the final prospectus filed with the Securities
and Exchange Commission pursuant to Rule 424 under the Securities Act of 1933,
as amended.  For purposes of each subsequent Offering Date, the fair market
value shall be the closing price of the Common Stock on the prior Trading Day. 
In the event the Offering Date or the Exercise Date occurs on a weekend or legal
holiday, the fair market value shall be based on the closing bid price on the
next Trading Day.

    8.   EXERCISE OF OPTION.  Unless a participant withdraws from the Plan as
provided in paragraph 11, his or her option for the purchase of shares will be
exercised automatically on each Exercise Date of the Offering Period, and the
maximum number of full shares subject to option shall be purchased for such
participant at the applicable option price with the accumulated payroll
deductions in his or her account.  No fractional shares will be purchased and
any amount remaining in the participant's account after an Exercise Date shall
be held in the account until the next Exercise Date of the Offering Period,
unless the Offering Period has been oversubscribed or has terminated with such
Exercise Date, in which case such amount shall be refunded to the 

                                       -5-

<PAGE>

participant. During a participant's lifetime, a participant's option to 
purchase shares hereunder is exercisable only by him or her.

    9.   DELIVERY.  As promptly as practicable after the Exercise Date of each
Exercise Period, the Company shall arrange the delivery to each participant, as
appropriate, of a certificate representing the shares purchased upon exercise of
his or her option.  Any cash remaining to the credit of a participant's account
under the Plan after a purchase by him or her of shares at the termination of
each Exercise Period which is insufficient to purchase a full share of Common
Stock of the Company shall be applied to the participant's account for the next
Exercise Period.

    10.  AUTOMATIC TRANSFER TO LOW PRICE OFFERING PERIOD.  In the event that
the fair market value of the Company's Common Stock is lower on an Exercise Date
than it was on the Offering Date for that Offering Period, all Employees
participating in the Plan on the Exercise Date shall be deemed to have withdrawn
from the Offering Period immediately after the exercise of their option on such
Exercise Date and to have enrolled as participants in a new Offering Period
which begins on or about the day following such Exercise Date.  A participant
may elect to remain in the previous short Offering Period by filing a written
statement declaring such election with the Company prior to the time of the
automatic change to the new Offering Period.

    11.  WITHDRAWAL; TERMINATION OF EMPLOYMENT.

         (a)  A participant may withdraw all but not less than all the payroll
deductions credited to his or her account and not yet used to exercise his or
her option under the Plan at any time by giving written notice to the Company
pursuant to a form to be provided by the Company.  All of the participant's
payroll deductions credited to his or her account will be paid to such
participant as promptly as practicable after receipt of notice of withdrawal and
such participant's remaining option or options for the Offering Period will be
automatically terminated, and no further payroll deductions for the purchase of
shares will be made during the Offering Period.  If a participant withdraws from
an Offering Period, payroll deductions will not resume at the beginning of the
succeeding Offering Period unless the participant delivers to the Company a new
subscription agreement.

         (b)  Upon a participant's ceasing to be an Employee prior to an
Exercise Date for any reason, including retirement or death, or upon termination
of a participant's employment relationship (as described in Section 2(g)), the
payroll deductions credited to such participant's account during the Exercise
Period but not yet used to exercise the option will be returned to such
participant or, in the case of his or her death, to the person or persons
entitled thereto under paragraph 15, and such participant's remaining option or
options will be automatically terminated.

         (c)  In the event an Employee fails to remain an Employee during an
Offering Period in which the Employee is a participant, he or she will be deemed
to have elected to withdraw from the Plan and the payroll deductions credited to
his or her account will be returned to such participant and such participant's
remaining option or options terminated.

                                       -6-

<PAGE>

         (d)  A participant's withdrawal from an Offering Period will not have
any effect upon his or her eligibility to participate in any similar plan which
may hereafter be adopted by the Company or in succeeding Offering Periods which
commence after the termination of the Offering Period from which the participant
withdraws.

    12.  INTEREST.  No interest shall accrue on the payroll deductions of a
participant in the Plan.

    13.  STOCK.

         (a)  The maximum number of shares of the Company's Common Stock which
shall be made available for sale under the Plan shall be 1,200,000 shares,
subject to adjustment upon changes in capitalization of the Company as provided
in paragraph 19.  If on a given Exercise Date the number of shares with respect
to which options are to be exercised exceeds the number of shares then available
under the Plan (after deduction of all shares for which options have been
exercised or are then outstanding), the Company shall make a pro rata allocation
of the shares remaining available for option grant in as uniform a manner as
shall be practicable and as it shall determine to be equitable.  In such event,
the Company shall give written notice of such reduction of the number of shares
subject to the option to each Employee affected thereby and shall similarly
reduce the rate of payroll deductions, if necessary.

         (b)  The participant will have no interest or voting right in shares
covered by his option until such option has been exercised.

         (c)  Shares to be delivered to a participant under the Plan will be
registered in the name of the participant or in the name of the participant and
his spouse.

    14.  ADMINISTRATION.  The Plan shall be administered by the Board of
Directors of the Company or a committee appointed by the Board.  The Board or
its committee shall have full and exclusive discretionary authority to construe,
interpret and apply the terms of the Plan, to determine eligibility and to
adjudicate all disputed claims filed under the Plan.  Every finding, decision
and determination made by the Board or its committee shall, to the full extent
permitted by law, be final and binding upon all parties.  Members of the Board
who are eligible Employees are permitted to participate in the Plan, provided
that:

         (a)  Members of the Board who are eligible to participate in the Plan
may not vote on any matter affecting the administration of the Plan or the grant
of any option pursuant to the Plan.

         (b)  If a Committee is established to administer the Plan, no member
of the Board who is eligible to participate in the Plan may be a member of the
Committee.

                                       -7-

<PAGE>

         (c) RULE 16b-3 LIMITATIONS.  Notwithstanding the provisions of
Subsection (a) of this Section 13, in the event that Rule 16b-3 promulgated
under the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or
any successor provision ("Rule 16b-3") provides specific requirements for the
administrators of plans of this type, the Plan shall be only administered by
such a body and in such a manner as shall comply with the applicable
requirements of Rule 16b-3.  Unless permitted by Rule 16b-3, no discretion
concerning decisions regarding the Plan shall be afforded to any committee or
person that is not "disinterested" as that term is used in Rule 16b-3.

    15.  DESIGNATION OF BENEFICIARY.

         (a)  A participant may file a written designation of a beneficiary who
is to receive any shares and cash, if any, from the participant's account under
the Plan in the event of such participant's death subsequent to the end of the
Offering Period but prior to delivery to him of such shares and cash.  In
addition, a participant may file a written designation of a beneficiary who is
to receive any cash from the participant's account under the Plan in the event
of such participant's death prior to the Exercise Date of the offering period.

         (b)  Such designation of beneficiary may be changed by the participant
at any time by written notice.  In the event of the death of a participant and
in the absence of a beneficiary validly designated under the Plan who is living
at the time of such participant's death, the Company shall deliver such shares
and/or cash to the executor or administrator of the estate of the participant,
or if no such executor or administrator has been appointed (to the knowledge of
the Company), the Company, in its discretion, may deliver such shares and/or
cash to the spouse or to any one or more dependents or relatives of the
participant, or if no spouse, dependent or relative is known to the Company,
then to such other person as the Company may designate.

    16.  TRANSFERABILITY.  Neither payroll deductions credited to a
participant's account nor any rights with regard to the exercise of an option or
to receive shares under the Plan may be assigned, transferred, pledged or
otherwise disposed of in any way (other than by will, the laws of descent and
distribution or as provided in paragraph 15 hereof) by the participant.  Any
such attempt at assignment, transfer, pledge or other disposition shall be
without effect, except that the Company may treat such act as an election to
withdraw funds from an Offering Period in accordance with paragraph 11.

    17.  USE OF FUNDS.  All payroll deductions received or held by the Company
under the Plan may be used by the Company for any corporate purpose, and the
Company shall not be obligated to segregate such payroll deductions.

    18.  REPORTS.  Individual accounts will be maintained for each participant
in the Plan.  Statements of account will be given to participating Employees
annually, which statements will set forth the amounts of payroll deductions, the
per share purchase price, the number of shares purchased and the remaining cash
balance, if any.

                                       -8-

<PAGE>

    19.  ADJUSTMENTS UPON CHANGES IN CAPITALIZATION.  Subject to any required
action by the stockholders of the Company, the number of shares of Common Stock
covered by each option under the Plan which has not yet been exercised and the
number of shares of Common Stock which have been authorized for issuance under
the Plan but have not yet been placed under option (collectively, the
"Reserves") as well as the price per share of Common Stock covered by each
option under the Plan which has not yet been exercised, 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 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 issue 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.

    In the event of the proposed dissolution or liquidation of the Company, the
Offering Period will terminate immediately prior to the consummation of such
proposed action, unless otherwise provided by the Board.  In the event of a
proposed sale of all or substantially all of the assets of the Company, or the
merger of the Company with or into another corporation, each option under the
Plan shall be assumed or an equivalent option shall be substituted by such
successor corporation or a parent or subsidiary of such successor corporation,
unless the Board determines, in the exercise of its sole discretion and in lieu
of such assumption or substitution, to shorten the Offering Period then in
progress by setting a new Exercise Date (the "New Exercise Date").  If the Board
shortens the Offering Period then in progress in lieu of assumption or
substitution in the event of a merger or sale of assets, the Board shall notify
each participant in writing, at least thirty (30) days prior to the New Exercise
Date, that the Exercise Date for his option has been changed to the New Exercise
Date and that his option will be exercised automatically on the New Exercise
Date, unless prior to such date he has withdrawn from the Offering Period as
provided in paragraph 11.  For purposes of this paragraph, an option granted
under the Plan shall be deemed to be assumed if, following the sale of assets or
merger the option confers the right to purchase, for each share of option stock
subject to the option immediately prior to the sale of assets or merger the
consideration (whether stock, cash or other securities or property) received in
the sale of assets or merger by holders of Common Stock for each share of Common
Stock held on the effective date of the transaction (and if such holders were
offered a choice of consideration, the type of consideration chosen by the
holders of a majority of the outstanding shares of Common Stock); provided,
however, that if such consideration received in the sale of assets or merger was
not solely common stock of the successor corporation or its parent (as defined
in Section 424(e) of the Code), the Board may, with the consent of the successor
corporation, provide for the consideration to be received upon exercise of the
option 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 sale of assets or merger.

                                       -9-

<PAGE>

    The Board may, if it so determines in the exercise of its sole discretion,
also make provision for adjusting the Reserves, as well as the price per share
of Common Stock covered by each outstanding option, in the event that the
Company effects one or more reorganizations, recapitalizations, rights offerings
or other increases or reductions of shares of its outstanding Common Stock, and
in the event of the Company being consolidated with or merged into any other
corporation.

    20.  AMENDMENT OR TERMINATION.

         (a)  The Board of Directors of the Company may at any time and for any
reason terminate or amend the Plan.  Except as provided in paragraph 19, no such
termination can affect options previously granted, provided that an Offering
Period may be terminated by the Board of Directors on any Exercise Date if the
Board determines that the termination of the Plan is in the best interests of
the Company and its stockholders.  Except as provided in paragraph 19, no
amendment may make any change in any option theretofore granted which adversely
affects the rights of any participant.  To the extent necessary to comply with
Rule 16b-3 under the Securities Exchange Act of 1934, as amended, or under
Section 423 of the Code (or any successor rule or provision or any other
applicable law or regulation), the Company shall obtain stockholder approval in
such a manner and to such a degree as required.

         (b)  Without stockholder consent and without regard to whether any
participant rights may be considered to have been "adversely affected," the
Board (or its committee) shall be entitled to change the Offering Periods, limit
the frequency and/or number of changes in the amount withheld during an Offering
Period, establish the exchange ratio applicable to amounts withheld in a
currency other than U.S. dollars, permit payroll withholding in excess of the
amount designated by a participant in order to adjust for delays or mistakes in
the Company's processing of properly completed withholding elections, establish
reasonable waiting and adjustment periods and/or accounting and crediting
procedures to ensure that amounts applied toward the purchase of Common Stock
for each participant properly correspond with amounts withheld from the
participant's Compensation, and establish such other limitations or procedures
as the Board (or its committee) determines in its sole discretion advisable
which are consistent with the Plan.

    21.  NOTICES.  All notices or other communications by a participant to the
Company under or in connection with the Plan shall be deemed to have been duly
given when received in the form specified by the Company at the location, or by
the person, designated by the Company for the receipt thereof.

    22.  CONDITIONS UPON ISSUANCE OF SHARES.  Shares shall not be issued with
respect to an option unless the exercise of such option and the issuance and
delivery of such shares pursuant thereto shall comply with all applicable
provisions of law, domestic or foreign, including, without limitation, the
Securities Act of 1933, as amended, the Securities Exchange Act of 1934, as
amended, the rules and regulations promulgated thereunder, and the requirements
of any stock exchange 

                                       -10-

<PAGE>

upon which the shares may then be listed, and shall be further subject to the 
approval of counsel for the Company with respect to such compliance.

         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 by any of
the aforementioned applicable provisions of law.

    23.  TERM OF PLAN.  The Plan shall be come effective upon the earlier to
occur of its adoption by the Board of Directors or its approval by the
stockholders of the Company.  It shall continue for a term of twenty (20) years
unless sooner terminated under Section 20.

                                       -11-

<PAGE>

                                   EXHIBIT A


                        QUICKTURN DESIGN SYSTEMS, INC.

                  1993 EMPLOYEE QUALIFIED STOCK PURCHASE PLAN

                            SUBSCRIPTION AGREEMENT



____  Original Application                         Offering Date: ____________
____  Change in Payroll Deduction Rate
____  Change of Beneficiary


1.  _____________________________________________hereby elects to participate
    in the Quickturn Design Systems, Inc. 1993 Employee Qualified Stock
    Purchase Plan (the "Stock Purchase Plan") and subscribes to purchase shares
    of the Company's Common Stock in accordance with this Subscription
    Agreement and the Stock Purchase Plan.

2.  I hereby authorize payroll deductions from each paycheck in the amount of
    __________% of my Compensation on each payday (not to exceed 10% of
    Compensation) during the Offering Period in accordance with the Stock
    Purchase Plan.  (Please note that no fractional percentages are permitted). 
    Such deductions are to continue for succeeding Offering Periods under the
    Stock Purchase Plan until I give written instructions for a decrease in or
    termination of such deductions.

3.  I understand that said payroll deductions shall be accumulated for the
    purchase of shares of Common Stock at the applicable purchase price
    determined in accordance with the Stock Purchase Plan.  I further
    understand that, except as otherwise set forth in the Stock Purchase Plan,
    shares will be purchased for me automatically on each Exercise Date of the
    Offering Period unless I otherwise withdraw from the Stock Purchase Plan by
    giving written notice to the Company for such purpose.

4.  Shares purchased for me under the Stock Purchase Plan should be issued in
    the name(s) of (Employee or Employee and Spouse as Joint Tenants with Right
    of Survivorship):___________________________________________________________
    ____________________________________________________________________________
    _______.

5.  I acknowledge that, under the Internal Revenue Code, there are special tax
    "holding period" rules that govern the tax consequences of buying and
    selling shares under the Stock Purchase Plan.  I understand that if I
    dispose of shares purchased under the Plan within 

<PAGE>

    two years of the Offering Date (i.e., the first day of the Offering Period) 
    or within one year of the Exercise Date (i.e., the date the shares are 
    purchased), I will be treated for federal income tax purposes as having 
    received ordinary income at the time of the sale equal to the difference 
    between my purchase price and the market value of the stock ON THE EXERCISE 
    DATE.  Any amount in excess of that difference will be treated as capital 
    gain.  I hereby agree to notify the Company in writing within 30 days after 
    the date of any such disposition.

    I further understand that if I hold the shares for both the 2-year and
    1-year holding periods described above, at the time I dispose of the shares
    I will be treated for federal income tax purposes as having received
    ordinary income in an amount equal only to the lesser of (1) 15% of the
    fair market value of the shares on the Offering Date or (2) the difference
    between my purchase price and the actual sale price for my stock.  Any
    additional gain I receive on the sale will be treated as capital gain.

6.  I understand that my participation in the Stock Purchase Plan is in all
    respects subject to the terms of the Plan.

7.  I hereby agree to be bound by the terms of the Stock Purchase Plan.  The
    effectiveness of this Subscription Agreement is dependent upon my
    eligibility to participate in the Stock Purchase Plan.

8.  In the event of my death, I hereby designate the following as my
    beneficiary(ies) to receive all payments and shares due me under the Stock
    Purchase Plan:


    NAME:  (Please print)_______________________________________________________
                         (First)         (Middle)               (Last)

    __________________________       ___________________________________________
    Relationship

                                     ___________________________________________
                                     (Address)


    NAME:  (Please print)_______________________________________________________
                         (First)         (Middle)               (Last)

    __________________________       ___________________________________________
    Relationship

                                     ___________________________________________

                                       -2-

<PAGE>

                                     (Address)

Employee's Social
Security Number:                     ___________________________________________

Employee's Address:                       ______________________________________

                                     ___________________________________________

                                     ___________________________________________


I UNDERSTAND THAT THIS SUBSCRIPTION AGREEMENT SHALL REMAIN IN EFFECT THROUGHOUT
SUCCESSIVE OFFERING PERIODS UNLESS TERMINATED BY ME.



Dated:____________________           ___________________________________________
                                     Signature of Employee

                                       -3-

<PAGE>

                                   EXHIBIT B

                        QUICKTURN DESIGN SYSTEMS, INC.

                  1993 EMPLOYEE QUALIFIED STOCK PURCHASE PLAN

                             NOTICE OF WITHDRAWAL



    The undersigned participant in the Offering Period of the Quickturn Design
Systems, Inc. 1993 Employee Qualified Stock Purchase Plan which began on
____________, 19__ (the "Offering Date") hereby notifies the Company that he or
she hereby withdraws from the Offering Period.  He or she hereby directs the
Company to pay to the undersigned as promptly as possible all the payroll
deductions credited to his or her account with respect to such Offering Period.
The undersigned understands and agrees that his or her remaining option or
options for such Offering Period will be automatically terminated.  The
undersigned understands further that no further payroll deductions will be made
for the purchase of shares in the current Offering Period and the undersigned
shall be eligible to participate in succeeding Offering Periods only by
delivering to the Company a new Subscription Agreement.

                                  Name and Address of Participant

                                  ________________________________

                                  ________________________________

                                  ________________________________


                                  Signature


                                  ________________________________


                                  Date:__________________________


<PAGE>

                                                              EXHIBIT 5.1

                        WILSON SONSINI GOODRICH & ROSATI
                            PROFESSIONAL CORPORATION

                               650 PAGE MILL ROAD
                        PALO ALTO, CALIFORNIA  94304-1050
                 TELEPHONE 415-493-9300  FACSIMILE 415-493-6811


                                 April 18, 1997


Quickturn Design Systems, Inc.
440 Clyde Avenue
Mountain View, California  94043

     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 Quickturn Design Systems, Inc. (the 
"Registrant" or "you"), with the Securities and Exchange Commission on or 
about April 18, 1997, in connection with the registration under the 
Securities Act of 1933, as amended, of 1,000,000 shares of your Common Stock 
(the "Shares") reserved for issuance pursuant to the 1997 Stock Option Plan 
(the "1997 Plan") and 750,000 shares of your Common Stock reserved for 
issuance pursuant to the 1993 Employee Qualified Stock Purchase Plan (the 
"Purchase Plan").  The 1,000,000 shares of Common Stock reserved under the 
1997 Plan and the 750,000 shares of Common Stock reserved under the Purchase 
Plan are referred to collectively hereinafter as the "Shares," and the 1997 
Plan and the Purchase Plan are referred to collectively hereinafter as the 
"Plans."  As your legal counsel, we have examined the actions taken and 
proposed to be taken by you in connection with the proposed sale, issuance 
and payment of consideration for the Shares to be issued under the Plans.

     It is our opinion that, upon completion of the actions being taken, or 
contemplated by us as your counsel to be taken by you prior to the issuance 
of the Shares pursuant to the Registration Statement and the Plans, and upon 
completion of the actions being taken in order to permit such transactions to 
be carried out in accordance with the securities laws of the various states 
where required, the Shares will be legally and validly issued, fully paid and 
non-assessable.

     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 amendment thereto.

                              Sincerely,

                              WILSON SONSINI GOODRICH & ROSATI
                              Professional Corporation

                              /s/  Wilson Sonsini Goodrich & Rosati



<PAGE>

                                                              EXHIBIT 23.2

                     CONSENT OF INDEPENDENT ACCOUNTANTS


We consent to the incorporation by reference in this Registration Statement 
on Form S-8 pertaining to the 1997 Stock Option Plan and the 1993 Employee 
Qualified Stock Purchase Plan of our reports dated January 16, 1997, on our 
audits of the consolidated financial statements and financial statement 
schedules of Quickturn Design Systems, Inc. as of December 31, 1996 and 1995, 
and for the three years in the period ended December 31, 1996, which reports 
are incorporated by reference or are included in the Annual Report on Form 
10-K for the year ended December 31, 1996, filed with the Securities and 
Exchange Commission.

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



San Jose, California
April 17, 1997




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