CADENCE DESIGN SYSTEMS INC
S-8 POS, 1999-06-07
PREPACKAGED SOFTWARE
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<PAGE>

      AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON JUNE 7, 1999
                                                      REGISTRATION NO. 333-69589
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                                  ------------
                       POST- EFFECTIVE AMENDMENT NO. 1 ON
                              FORM S-8 TO FORM S-4
                             REGISTRATION STATEMENT
                                      Under
                           The Securities Act of 1933
                                  ------------

                          CADENCE DESIGN SYSTEMS, INC.
             (Exact name of registrant as specified in its charter)

            DELAWARE                                  77-0148231
  (State or Other Jurisdiction           (I.R.S. Employer Identification No.)
of Incorporation or Organization)

                          2655 SEELY AVENUE, BUILDING 5
                           SAN JOSE, CALIFORNIA 95134
               (Address of Principal Executive Offices) (Zip Code)
                             ----------------------

                 OPTIONS ASSUMED BY CADENCE DESIGN SYSTEMS, INC.
                          ORIGINALLY GRANTED UNDER THE
              QUICKTURN DESIGN SYSTEMS, INC. 1988 STOCK OPTION PLAN
                 PI DESIGN SYSTEMS, INC. 1990 STOCK OPTION PLAN
       QUICKTURN DESIGN SYSTEMS, INC. 1992 KEY EXECUTIVE STOCK OPTION PLAN
   QUICKTURN DESIGN SYSTEMS, INC. 1993 EMPLOYEE QUALIFIED STOCK PURCHASE PLAN
     QUICKTURN DESIGN SYSTEMS, INC. 1996 SUPPLEMENTAL STOCK PLAN, AS AMENDED
        QUICKTURN DESIGN SYSTEMS, INC. 1997 STOCK OPTION PLAN, AS AMENDED
     QUICKTURN DESIGN SYSTEMS, INC. 1994 OUTSIDE DIRECTOR STOCK OPTION PLAN
        SPEEDSIM, INC. 1995 INCENTIVE AND NONQUALIFIED STOCK OPTION PLAN
                        OF QUICKTURN DESIGN SYSTEMS, INC.
                           (Full titles of the Plans)
                             ----------------------

                              R.L. SMITH MCKEITHEN
              SENIOR VICE PRESIDENT, GENERAL COUNSEL AND SECRETARY
                          CADENCE DESIGN SYSTEMS, INC.
            2655 SEELY AVENUE, BUILDING 5, SAN JOSE, CALIFORNIA 95134
                     (Name and Address of Agent for Service)
                                 (408) 943-1234

          (Telephone number, including area code, of agent for service)
                             ----------------------
                                   COPIES TO:

                              KENNETH R. LAMB, ESQ.
                           GIBSON, DUNN & CRUTCHER LLP
                        ONE MONTGOMERY STREET, 26TH FLOOR
                         SAN FRANCISCO, CALIFORNIA 94104
                                 (415) 393-8200


<PAGE>

                         CALCULATION OF REGISTRATION FEE
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                    Proposed Maximum       Proposed Maximum         Amount of
Title of Securities to        Amount to be           Offering Price            Aggregate          Registration
    be Registered           Registered (1)(2)         per Share (3)        Offering Price (3)       Fee(3)(4)
    -------------           ----------                ---------            --------------           ---------
<S>                         <C>                     <C>                    <C>                    <C>
Common Stock, par           3,768,800 shares             $7.5424              $28,425,797               $0
value $.01 per share

</TABLE>

- --------------------------------------------------------------------------------
(1)      Shares subject to Options assumed as of May 25, 1999. Pursuant to Rule
         416(a), this Registration Statement shall also cover any additional
         shares of Common Stock which become issuable under the Quickturn Design
         Systems, Inc. 1988 Stock Option Plan, Pi Design Systems, Inc. 1990
         Stock Option Plan, Quickturn Design Systems, Inc. 1992 Key Executive
         Stock Option Plan, Quickturn Design Systems, Inc. 1993 Employee
         Qualified Stock Purchase Plan, Quickturn Design Systems, Inc. 1996
         Supplemental Stock Plan, as amended, Quickturn Design Systems, Inc.
         1997 Stock Option Plan, as amended, Quickturn Design Systems, Inc. 1994
         Outside Director Stock Option Plan, and/or SpeedSim, Inc. 1995
         Incentive and Nonqualified Stock Option Plan (collectively, the
         "Assumed Option Plans") by reason of any stock dividend, stock split,
         recapitalization or other similar transaction effected without the
         receipt of consideration which results in an increase in the number of
         the outstanding shares of Cadence Design Systems, Inc. Common Stock.

(2)      The Registrant previously registered 11,800,000 shares of its common
         stock, par value $.01 per share, under its Registration Statement on
         Form S-4 (No. 333-69589) (the "Original Form S-4"), which was declared
         effective on April 20, 1999 and 23,604,575 shares of its common stock,
         par value $.01 per share, under its Registration Statement on Form S-4
         (No. 333-69589) (the "Successor S-4"), which was declared effective on
         May 7, 1999. The number of shares registered under the Successor S-4,
         combined with the number of shares registered under the Original Form
         S-4, was based on the aggregate number of outstanding shares of
         Quickturn Design Systems, Inc. ("Quickturn") common stock, par value
         $.001 per share, and the number of shares of Quickturn common stock
         issuable upon exercise of outstanding options and warrants to acquire
         shares of Quickturn common stock, multiplied by an assumed exchange
         ratio (representing a value of $15 per share of Quickturn common stock)
         of 1.5 shares of common stock, par value $.01 per share, of the
         Registrant, based on an assumed per share price of the Registrant's
         common stock of $10.

(3)      Weighted average exercise price of outstanding options assumed as of
         May 25, 1999. Calculated solely for purposes of this offering under
         Rule 457(h) of the Securities Act of 1933, as amended, on the basis of
         the maximum offering price per share that such options may be
         exercised.

(4)      A registration fee of $91,885.31 was previously paid in connection with
         the registration of 11,800,000 shares of the Registrant's common stock
         under the Original Form S-4. The registration fee paid under the
         Original Form S-4 was calculated pursuant to Rules 457(f) and 457(c)
         under the Securities Act of 1933, as amended (the "Securities Act"),
         based on the average of the high and low sales prices of Quickturn
         common stock, as reported by the Nasdaq National Market System on April
         30, 1999 ($13.9375), the proposed maximum offering price under the
         Successor S-4 was $328,967,509.38. Because that amount was less than
         the proposed maximum offering price of $330,622,711.75 set forth on the
         facing page of the Original Form S-4, no registration fee was payable
         with the Successor S-4. As the shares subject to options assumed by the
         Registrant were included in the Successor S-4 at a proposed maximum
         offering price per share of $13.9375 and a proposed maximum aggregate
         offering price of $328,967,509.38 for which a registration fee of
         $91,885.31 was paid with the Original S-4, no fee is payable herewith.

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

<PAGE>

The shares of common stock subject to options registered hereunder have been
assumed by Cadence Design Systems, Inc. ("Cadence" or the "Registrant") pursuant
to an Agreement and Plan of Merger, dated as of December 8, 1998, as amended,
among Cadence, CDSI Acquisition, Inc., a Delaware corporation and wholly-owned
subsidiary of Cadence, and Quickturn Design Systems, Inc., a Delaware
corporation ("Quickturn"). These options were originally granted to directors,
employees and consultants of Quickturn and/or Quickturn's subsidiaries under the
Assumed Option Plans.
 .

<PAGE>

                                     PART II

               INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

Item 3.  INCORPORATION OF DOCUMENTS BY REFERENCE

         The Registrant hereby incorporates by reference into this Registration
Statement the following documents previously filed with the Securities and
Exchange Commission (the "Commission"):

                  (a)      The Registrant's Annual Report on Form 10-K for the
                           fiscal year ended January 2, 1999, including all
                           material incorporated by reference therein;

                  (b)      The Registrant's Quarterly Report on Form 10-Q for
                           the fiscal quarter ended April 3, 1999, including all
                           material incorporated by reference therein;

                  (c)      The Registrant's Current Report on Form 8-K filed
                           with the Commission on May 6, 1999;

                  (d)      The Registrant's Current Report on Form 8-K filed
                           with the Commission on May 26, 1999;

                  (e)      The Registrant's Current Report on Form 8-K/A filed
                           with the Commission on January 6, 1999;

                  (f)      The Registrant's Current Report on Form 8-K/A filed
                           with the Commission on May 20, 1999;

                  (g)      The description of the Registrant's Common Stock to
                           be offered hereby contained in the Registrant's
                           Registration Statement on Form 8-A filed with the
                           Commission on August 29, 1990;

                  (h)      The description of the Registrant's Preferred Share
                           Purchase Rights set forth in Exhibit 1A, 1B and 1C to
                           the Registrant's Current Report on Form 8-A filed
                           with the Commission on February 16, 1996.

         All documents filed pursuant to Sections 13(a), 13(c), 14 or 15(d) of
the Securities Exchange Act of 1934, as amended (the "1934 Act") after the date
of this Registration Statement and prior to the filing of a post-effective
amendment which indicates that all securities offered hereby have been sold or
which deregisters all securities then remaining unsold shall be deemed to be
incorporated by reference into this Registration Statement and to be a part
hereof from the date of filing of such documents.

         Any document, and any statement contained in a document, incorporated
or deemed to be incorporated by reference herein shall be deemed to be modified
or superseded for purposes of this Registration Statement to the extent that a
statement contained herein, or in any other subsequently filed document that
also is incorporated or deemed to be incorporated by reference herein, modifies
or supersedes such document or statement. Any such document or statement so
modified or superseded shall not be deemed, except as so modified or superseded,
to constitute a part of this Registration Statement. Subject to the foregoing,
all information appearing in this Registration Statement is qualified in its
entirety by the information appearing in the documents incorporated by
reference.

Item 4.  DESCRIPTION OF SECURITIES

         Not Applicable.

                                     II-1
<PAGE>

Item 5.  INTERESTS OF NAMED EXPERTS AND COUNSEL

         Not Applicable.

Item 6.  INDEMNIFICATION OF DIRECTORS AND OFFICERS

         Section 145 of the Delaware General Corporation Law permits a
corporation to indemnify any of its directors or officers who was or is a party
or is threatened to be made a party to any third party proceeding by reason of
the fact that such person is or was a director or officer of the corporation
against expenses (including attorneys' fees), judgments, fines and amounts paid
in settlement actually and reasonably incurred by such person in connection with
such action, suit or proceeding, if such person acted in good faith and in a
manner such person reasonably believed to be in or not opposed to the best
interests of the corporation, and, with respect to any criminal action or
proceeding, had no reasonable cause to believe that such person's conduct was
unlawful. In a derivative action, i.e., one by or in the right of a corporation,
the corporation is permitted to indemnify any of its directors or officers
against expenses (including attorneys' fees) actually and reasonably incurred by
such person in connection with the defense or settlement of such action or suit
if such person acted in good faith and in a manner such person reasonably
believed to be in or not opposed to the best interests of the corporation,
except that no indemnification shall be made if such person shall have been
adjudged liable to the corporation, unless and only to the extent that the court
in which such action or suit was brought shall determine upon application that
such person is fairly and reasonably entitled to indemnity for such expenses
despite such adjudication of liability.

         Article VII of the Registrant's currently effective Certificate of
Incorporation eliminates the personal liability of its directors for monetary
damages for breach of fiduciary duty as a director, except for liability (i) for
any breach of the director's duty of loyalty to the corporation or its
stockholders, (ii) for acts or omissions not in good faith or which involve
intentional misconduct or a knowing violation of law, (iii) under Section 174 of
the Delaware General Corporation Law or (iv) for any transaction from which the
director derived an improper personal benefit. In addition, as permitted by
Section 145 of the Delaware General Corporation Law, the Bylaws of the
Registrant provide that: (a) the Registrant is required to indemnify its
directors and officers and persons serving in such capacities in other business
entities (including, for example, subsidiaries of the Registrant) at the
Registrant's request (such directors, officers and other persons are
collectively, "Covered Persons"), to the fullest extent permitted by Delaware
law, including those circumstances in which indemnification would otherwise be
discretionary; (b) the Registrant is required to advance expenses, as incurred
to such Covered Persons in connection with defending a proceeding; (c) the
indemnitee(s) of the Registrant have the right to bring suit, and to be paid the
expenses of prosecuting such suit if successful, to enforce the rights to
indemnification under the Bylaws or to advancement of expenses under the Bylaws;
(d) the rights conferred in the Bylaws are not exclusive and the Registrant is
authorized to enter into indemnification agreements with such directors,
officers and employees; (e) the Registrant is required to maintain director and
officer liability insurance to the extent reasonably available; and (f) the
Registrant may not retroactively amend the Bylaws indemnification provision in a
way that is adverse to such Covered Persons.

         The Registrant has entered into indemnity agreements with each of its
executive officers and directors that provide the maximum indemnity allowed to
officers and directors by Section 145 of the Delaware General Corporation Law
and the Bylaws, as well as certain additional procedural protections. The
Registrant also maintains a limited amount of director and officer insurance.
The indemnification provision in the Bylaws, and the indemnity agreements
entered into between the Registrant and its officers or directors, may be
sufficiently broad to permit indemnification of the Registrant's officers and
directors for liability arising under the Securities Act of 1933, as amended
(the "1933 Act").

Item 7.  EXEMPTION FROM REGISTRATION CLAIMED

         Not Applicable.

                                     II-2

<PAGE>

Item 8.  EXHIBITS

<TABLE>
<CAPTION>
EXHIBIT NUMBER                EXHIBIT
<S>                           <C>
         4.1(a)               The description of the Registrant's Common Stock.
                              Reference is made to the Registrant's
                              Registration Statement on Form 8-A filed with the
                              Commission on August 29, 1990 incorporated
                              by reference pursuant to Item 3(g);

            (b)               The description of the Registrant's Preferred
                              Share Purchase Rights. Reference is made to
                              Exhibit 1A, 1B and 1C to the Registrant's Current
                              Report on Form 8-A filed with the Commission on
                              February 16, 1996 incorporated by reference
                              pursuant to Item 3(h).
         4.2                  Specimen Certificate of the Registrant's Common
                              Stock (incorporated by reference to Exhibit 4.01
                              of the Registrant's Registration Statement on Form
                              S-4 (33-43400)).
         4.3                  Rights Agreement, dated as of February 9, 1996,
                              between the Registrant and Harris Trust and
                              Savings Bank which includes as exhibits thereto
                              the Certificate of Designation for the Series A
                              Junior Participating Preferred Stock, the form
                              of Rights Certificate, and the Summary of
                              Rights to Purchase Preferred Shares
                              (incorporated by reference to Exhibit 1A, 1B,
                              and 1C to the Registrant's Current Report on
                              Form 8-K filed on February 16, 1996).
         5                    Opinion and consent of Gibson, Dunn & Crutcher
                              LLP.
         23.1                 Consent of Arthur Andersen LLP, Independent Public
                              Accountants.
         23.2                 Consent of Gibson, Dunn & Crutcher LLP (contained
                              in Exhibit 5).
         99.1                 Quickturn Design Systems, Inc. 1988 Stock Option
                              Plan, as amended and Form of 1988 Stock Option
                              Agreement for the 1988 Stock Option Plan, as
                              amended.
         99.2                 Pi Design Systems, Inc. 1990 Stock Option Plan, as
                              amended.
         99.3                 Quickturn Design Systems, Inc. 1992 Key Executive
                              Stock Option Plan, as amended and Form of
                              Incentive Stock Option Agreement, as amended.
         99.4                 Quickturn Design Systems, Inc. 1993 Employee
                              Qualified Stock Purchase Plan, as amended and
                              Form of Subscription Agreement for the 1993
                              Employee Qualified Stock Purchase Plan, as
                              amended.
         99.5                 Quickturn Design Systems, Inc. 1996 Supplemental
                              Stock Plan, as amended and Form of Stock Option
                              Agreement for 1996 Supplemental Stock Plan, as
                              amended.
         99.6                 Quickturn Design Systems, Inc. 1997 Stock Option
                              Plan, as amended and Form of 1997 Stock Option
                              Agreement for the 1997 Stock Option Plan, as
                              amended.
         99.7                 Quickturn Design Systems, Inc. 1994 Outside
                              Director Stock Option Plan and Form of Director
                              Nonstatutory Stock Option Agreement.
         99.8                 SpeedSim, Inc. 1995 Incentive and Nonqualified
                              Stock Option Plan.

</TABLE>

Item 9.  UNDERTAKING

         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 1933 Act; (ii) to reflect in the prospectus any facts or events
arising after the effective date of this 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 this
Registration Statement; and (iii) to include any material information with
respect to the plan of distribution not previously disclosed in this
Registration Statement or any material change to such information in this
Registration Statement; PROVIDED, HOWEVER, that clauses (1)(i) and (l)(ii) shall
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 1934 Act that are
incorporated by reference into this Registration Statement; (2) that for the
purpose of determining any liability under the 1933 Act, 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, and
(3) to remove from

                                     II-3

<PAGE>

registration by means of a post-effective amendment any of the securities being
registered which remain unsold upon the termination of the offering under the
Assumed Stock Plans.

         B. The undersigned Registrant hereby undertakes that, for purposes of
determining any liability under the 1933 Act, each filing of the Registrant's
annual report pursuant to Section 13(a) or Section 15(d) of the 1934 Act that is
incorporated by reference into this Registration Statement shall be deemed to be
a new registration statement relating to the securities offered therein, and the
offering of such securities at that time shall be deemed to be the initial BONA
FIDE offering thereof.

         C. Insofar as indemnification for liabilities arising under the 1933
Act may be permitted to directors, officers or controlling persons of the
Registrant pursuant to the indemnity provisions incorporated by reference in
Item 6, or otherwise, the Registrant has been advised that in the opinion of the
Commission such indemnification is against public policy as expressed in the
1933 Act and is, therefore, unenforceable. In the event that a claim for
indemnification against such liabilities (other than the payment by the
Registrant of expenses incurred or paid by a director, officer or controlling
person of the Registrant in the successful defense of any action, suit or
proceeding) is asserted by such director, officer or controlling person in
connection with the securities being registered, the Registrant will, unless in
the opinion of its counsel the matter has been settled by controlling precedent,
submit to a court of appropriate jurisdiction the question whether such
indemnification by it is against public policy as expressed in the 1933 Act 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, as amended,
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 San Jose, State of California, on this 3rd day
of June, 1999.

                               CADENCE DESIGN SYSTEMS, INC.

                               By:______________________________*
                               H. Raymond Bingham
                               President, Chief Executive Officer and Director

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

<TABLE>
<CAPTION>

               SIGNATURE                                  TITLE                                  DATE
<S>                                      <C>                                                 <C>
     *                                   President,  Chief Executive Officer and             June 3, 1999
- ----------------------------------       Director (Principal Executive Officer)
     H. Raymond Bingham

     *                                   Senior Vice President,  Chief Financial             June 3, 1999
- -----------------------------------      Officer  (Principal  Financial  Officer
     William Porter                      and Principal Accounting Officer)

     *                                   Director                                            June 3, 1999
- -----------------------------------
     Carol A. Bartz

     *                                   Director                                            June 3, 1999
- -----------------------------------
     Dr. Leonard Y.W. Liu

     *                                   Director                                            June 3, 1999
- -----------------------------------
     Donald L. Lucas

     *                                   Director                                            June 3, 1999
- -----------------------------------
     Dr. Alberto Sangiovanni-
     Vincentelli

     *                                   Director                                            June 3, 1999
- -----------------------------------
     George M. Scalise

     *                                   Director                                            June 3, 1999
- -----------------------------------
     Dr. John B. Shoven

     *                                   Director                                            June 3, 1999
- -----------------------------------
     Roger S. Siboni

By:  /s/R.L. Smith McKeithen
- -----------------------------------
     R.L. Smith McKeithen
     Attorney-in-Fact

</TABLE>

                                     II-5


<PAGE>

                                  EXHIBIT INDEX

<TABLE>
<CAPTION>

Exhibit Number             Exhibit
- --------------             -------
<S>                        <C>
4.1(a)                     The description of the Registrant's Common Stock.
                           Reference is made to the Registrant's Registration
                           Statement on Form 8-A filed with the Commission on
                           August 29, 1990 incorporated by reference pursuant to
                           Item 3(g).

   (b)                     The description of the Registrant's Preferred Share
                           Purchase Rights. Reference is made to Exhibit 1A, 1B
                           and 1C to the Registrant's Current Report on Form 8-A
                           filed with the Commission on February 16, 1996
                           incorporated by reference pursuant to Item 3(h).

4.2                        Specimen Certificate of the Registrant's Common Stock
                           (incorporated by reference to Exhibit 4.01 of the
                           Registrant's Registration Statement on Form S-4
                           (33-43400)).

4.3                        Rights Agreement, dated as of February 9, 1996,
                           between the Registrant and Harris Trust and Savings
                           Bank which includes as exhibits thereto the
                           Certificate of Designation for the Series A Junior
                           Participating Preferred Stock, the form of Rights
                           Certificate, and the Summary of Rights to Purchase
                           Preferred Shares (incorporated by reference to
                           Exhibit 1A, 1B, and 1C to the Registrant's Current
                           Report on Form 8-K filed on February 16, 1996).

5                          Opinion and consent of Gibson, Dunn & Crutcher LLP.

23.1                       Consent of Arthur Andersen LLP, Independent Public
                           Accountants.

23.2                       Consent of Gibson, Dunn & Crutcher LLP (contained in
                           Exhibit 5).

99.1                       Quickturn Design Systems, Inc. 1988 Stock Option
                           Plan, as amended and Form of 1988 Stock Option
                           Agreement for the 1988 Stock Option Plan, as
                           amended.

99.2                       Pi Design Systems, Inc. 1990 Stock Option Plan, as
                           amended.

99.3                       Quickturn Design Systems, Inc. 1992 Key Executive
                           Stock Option Plan, as amended and Form of Incentive
                           Stock Option Agreement for the 1992 Key Executive
                           Stock Option Plan, as amended.

99.4                       Quickturn Design Systems, Inc. 1993 Employee
                           Qualified Stock Purchase Plan, as amended and Form
                           of Subscription Agreement to the 1993 Employee
                           Qualified Stock Purchase Plan, as amended.

99.5                       Quickturn Design Systems, Inc. 1996 Supplemental
                           Stock Plan, as amended and Form of Stock Option
                           Agreement for 1996 Supplemental Stock Plan, as
                           amended.

99.6                       Quickturn Design Systems, Inc. 1997 Stock Option
                           Plan, as amended and Form of the Stock Option
                           Agreement for the 1997 Stock Option Plan, as amended.

99.7                       Quickturn Design Systems, Inc. 1994 Outside Director
                           Stock Option Plan and Form of Director Nonstatutory
                           Stock Option Agreement.

99.8                       SpeedSim, Inc. 1995 Incentive and Nonqualified Stock
                           Option Plan.

</TABLE>



<PAGE>

                                                                       EXHIBIT 5

                   [Letterhead of Gibson, Dunn & Crutcher LLP]

                                   June 7,1999

Cadence Design Systems, Inc.
2655 Seely Avenue, Building 5
San Jose, CA 95134

         Re:      Post-Effective Amendment No. 1 Registration Statement on
                  Form S-8 to Form S-4 of Cadence Design Systems, Inc.
                  ----------------------------------------------------

Ladies and Gentlemen:

     We refer to the post-effective amendment No. 1 to registration statement on
Form S-8 to Form S-4 ("Registration Statement"), under the Securities Act of
1933, as amended (the "Securities Act") filed by Cadence Design Systems, Inc., a
Delaware corporation (the "Company"), with respect to the proposed offering by
the Company of up to 3,725,168 shares (the "Shares") of the common stock of the
Company, $.01 par value per share (the "Common Stock"), subject to issuance by
the Company upon exercise of options granted under the Quickturn Design Systems,
Inc. 1988 Stock Option Plan, the Pi Design Systems, Inc. 1990 Stock Option Plan,
the Quickturn Design Systems, Inc. 1992 Key Executive Stock Option Plan, the
Quickturn Design Systems, Inc. 1993 Employee Qualified Stock Purchase Plan, the
Quickturn Design Systems, Inc. 1996 Supplemental Stock Plan, as amended, the
Quickturn Design Systems, Inc. 1997 Stock Option Plan, as amended, the Quickturn
Design Systems, Inc. 1994 Outside Director Stock Option Plan, and the SpeedSim,
Inc. 1995 Incentive and Nonqualified Stock Option Plan (the "Plans") assumed by
the Company pursuant to the terms of the Agreement and Plan of Merger, dated as
of December 8, 1998 among the Company, CDSI Acquisition, Inc., a Delaware
corporation and wholly-owned subsidiary of the Company, and Quickturn Design
Systems, Inc., a Delaware corporation.

     We have examined the originals or certified copies of such corporate
records, certificates of officers of the Company and/or public officials and
such other documents and have made such other factual and legal investigations
as we have deemed relevant and necessary as the basis for the opinions set forth
below. In such examination, we have assumed the genuineness of all signatures,
the authenticity of all documents submitted to us as originals, the conformity
to original documents of all documents submitted to us as conformed or
photostatic copies and the authenticity of the originals of such copies.

     Based on our examination mentioned above, subject to the assumptions stated
above and relying on the statements of fact contained in the documents that we
have examined, we are of the opinion that (i) the issuance by the Company of the
Shares has been duly authorized and (ii) when issued in accordance with the
terms of the Plans, the Shares will be duly and validly issued, fully paid and
non-assessable shares of Common Stock.

     We are admitted to practice in the State of California, and are not
admitted to practice in the State of Delaware. However, for the limited purposes
of our opinion set forth above, we are generally familiar with the General
Corporation Law of the State of Delaware (the "DGCL") as presently in effect and
have made such inquiries as we consider necessary to render this opinion with
respect to a Delaware corporation. This opinion letter is limited to the laws of
the State of California and, to the limited extent set forth above, the DGCL, as
such laws presently exist and to the facts as they presently exist. We express
no opinion with respect to the effect or applicability of the laws of any other
jurisdiction. We assume no obligation to revise or supplement this opinion
letter should the laws of such jurisdictions be changed after the date hereof by
legislative action, judicial decision or otherwise.

<PAGE>

     We hereby consent to the filing of this opinion as an exhibit to the
Registration Statement. In giving this consent, we do not admit that we are
within the category of persons whose consent is required under Section 7 of the
Securities Act or the General Rules and Regulations of the Securities and
Exchange Commission.

                                            Very truly yours,

                                            /s/ GIBSON, DUNN & CRUTCHER LLP


<PAGE>

                                                                    EXHIBIT 23.1

         CONSENT OF ARTHUR ANDERSEN LLP, INDEPENDENT PUBLIC ACCOUNTANTS

As independent public accountants, we hereby consent to the incorporation by
reference in this Registration Statement of our report dated January 23, 1998
included in Cadence Design Systems, Inc.'s Form 10-K for the year ended January
2, 1999 (as amended by Form 10-K/A) and to all references to our Firm included
in this Registration Statement.

                               /s/ Arthur Andersen LLP
                               Arthur Andersen LLP


San Jose, California
June 4, 1999



<PAGE>

                                                                    Exhibit 99.1
                            QUICKTURN DESIGN SYSTEMS, INC.

                               1988 STOCK OPTION PLAN
                       (As amended through September 13, 1996)

     1.   PURPOSES OF THE PLAN.  The purposes of this Stock Option Plan are to
attract and retain the best available personnel for positions of substantial
responsibility, to provide additional incentive to the Employees and Consultants
of the Company and to promote the success of the Company's business.

          Options granted hereunder may be either Incentive Stock Options (as
defined in Section 422 of the Code) or Nonstatutory Stock Options, as determined
by the Administrator at the time of grant of an option and subject to the
applicable provisions of Section 422 of the Code, as amended, and the
regulations promulgated thereunder.

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

          (a)  "ADMINISTRATOR" shall mean the Board or any of its committees
appointed pursuant to Section 4 of the Plan.

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

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

          (d)  "COMMITTEE" shall mean the Committee appointed by the Board of
Directors in accordance with paragraph (a) of Section 4 of the Plan.

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

          (f)  "COMPANY" shall mean Quickturn Design Systems, Inc., a Delaware
corporation.

          (g)  "CONSULTANT" means any person, including an advisor, engaged by
the Company or a Parent or Subsidiary to render services and who is compensated
for such services, and any non-employee director of the Company."

          (h)  "CONTINUOUS STATUS AS AN EMPLOYEE OR CONSULTANT" shall mean the
absence of any interruption or termination of the employment relationship by the
Company or any Subsidiary.  Continuous Status as an Employee or Consultant shall
not be considered interrupted in the case of sick leave, military leave, or any
other leave of absence approved by the Board; provided that such leave is for a
period of not more than 90 days or reemployment upon the expiration of such
leave is guaranteed by contract or statute, or unless provided otherwise
pursuant to Company policy.

          (i)  "EMPLOYEE" shall mean any person, including Officers and
directors, employed by the Company or any Parent or Subsidiary of the Company.
The payment of a director's fee by the Company shall not be sufficient to
constitute "employment" by the Company.

          (j)  "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 National
market System of the National Association of Securities Dealers, Inc.  Automated
Quotation ("NASDAQ") System, its Fair Market Value shall be the closing sales
price for such stock (or the closing bid, if no sales were reported), as quoted
on such system or exchange for the last market



<PAGE>

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 quoted on the NASDAQ System (but not
on the National Market System thereof) or regularly quoted by a recognized
securities dealer but selling prices are not reported, its Fair Market Value
shall be the mean between the high and low asked prices for the Common Stock or;

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

          (k)  "INCENTIVE STOCK OPTION" shall mean an Option intended to qualify
as an incentive stock option within the meaning of Section 422 of the Code.

          (1)  "NONSTATUTORY STOCK OPTION" shall mean an Option not intended to
qualify as an Incentive Stock Option.

          (m)  "OFFICER" shall mean 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.

          (n)  "OPTION" shall mean a stock option granted pursuant to the Plan.

          (o)  "OPTIONED STOCK" shall mean the Common Stock subject to an
Option.

          (p)  "OPTIONEE" shall mean an Employee or Consultant who receives an
Option.

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

          (r)  "PLAN" shall mean this 1988 Stock Option Plan.

          (s)  "SHARE" shall mean a share of the Common Stock, as adjusted in
accordance with Section 11 of the Plan.

          (t)  "SUBSIDIARY" shall mean 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 11 of
the Plan, the maximum aggregate number of shares which may be optioned and sold
under the Plan is two million nine hundred eighty-six thousand (2,986,000)
shares of Common Stock.  The Shares may be authorized, but unissued, or
reacquired Common Stock.

          If an Option should expire or become unexercisable for any reason
without having been exercised in full, the unpurchased Shares which were subject
thereto shall, unless the Plan shall have been terminated, become available for
future grant under the Plan.

     4.   ADMINISTRATION OF THE PLAN.

          (a)  PROCEDURE.

               (i)   ADMINISTRATION WITH RESPECT TO DIRECTORS AND OFFICERS.
With respect to grants of Options to Employees who are also Officers or
directors of the Company, the Plan shall be administered by (A) the Board if the
Board may administer the Plan in compliance with Rule 16b-3 promulgated under
the Exchange Act or any successor thereto ("Rule 16b-3") with respect to a plan
intended to qualify thereunder as a discretionary plan, or (B) a committee
designated by the Board to administer the Plan, which committee shall be
constituted in such a


                                          2
<PAGE>

manner as to permit the Plan to comply with Rule 16b-3 with respect to a plan
intended to qualify thereunder as a discretionary plan.  Once appointed, such
committee shall continue to serve in its designated capacity until otherwise
directed by the Board.  From time to time the Board, may increase the size of
the committee and appoint additional members thereof, remove members (with or
without cause) and appoint new members in substitution therefor, fill vacancies,
however caused, and remove all members of the committee and thereafter directly
administer the Plan, all to the extent permitted by Rule 1 6b-3 with respect to
a plan intended to qualify thereunder as a discretionary plan.

               (ii)  MULTIPLE ADMINISTRATIVE BODIES.  If permitted by Rule 16b-
3, the Plan may be administered by different bodies with respect to directors,
non-director Officers and Employees who are neither directors nor Officers.

               (iii) ADMINISTRATION WITH RESPECT TO CONSULTANTS AND OTHER
EMPLOYEES.  With respect to grants of Options to Employees or Consultants who
are neither directors nor Officers of the Company, the Plan shall be
administered by (A) the Board or (B) a Committee designated by the Board, which
Committee shall be constituted in such a manner as to satisfy the legal
requirements relating to the administration of incentive stock option plans, if
any, of California corporate and securities laws and of the Code (the
"Applicable Laws").  Once appointed, such Committee shall continue to serve in
its designated capacity until otherwise directed by the Board.  From time to
time the Board may increase the size of the Committee and appoint additional
members thereof, remove members (with or without cause) and appoint new members
in substitution therefor, fill vacancies, however caused, and remove all members
of the Committee and thereafter directly administer the Plan, all to the extent
permitted by the Applicable Laws.

          (b)  POWERS OF THE ADMINISTRATOR.  Subject to the provisions of the
Plan and in the case of a Committee, 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 of the Common Stock, in
accordance with Section 2(j) of the Plan;

               (ii)  to select the Consultants and Employees to whom Options may
from time to time be granted hereunder;

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

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

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

               (vi)  to determine the terms and conditions, not inconsistent
with the terms of the Plan, of any award granted hereunder;

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

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

     5.   ELIGIBILITY.

          (a)  Nonstatutory Stock Options may be granted only to Employees and
Consultants.  Incentive Stock Options may be granted only to Employees.  An
Employee or Consultant who has been granted an Option may, if he is otherwise
eligible, be granted an additional Option or Options.


                                          3
<PAGE>

          (b)  Each Option shall be designated in the written option agreement
as either an Incentive Stock Option or a Nonstatutory Stock Option.  However,
notwithstanding such designations, to the extent that the aggregate Fair Market
Value of the Shares with respect to which Options designated as Incentive Stock
Options are exercisable for the first time by any Optionee during any calendar
year (under all plans of the Company or any Parent or Subsidiary) exceeds
$100,000, such excess Options shall be treated as Nonstatutory Stock Options.

          (c)  For purposes of Section 5(b), Incentive Stock Options shall be
taken into account in the order in which they were granted, and the Fair Market
Value of the Shares shall be determined as of the time the Option with respect
to such Shares is granted.

          (d)  The Plan shall not confer upon any Optionee any right with
respect to continuation of employment or consulting relationship with the
Company, nor shall it interfere in any way with his right or the Company's right
to terminate his employment or consulting relationship at any time, with or
without cause.

     6.   TERM OF PLAN.  The Plan shall become effective upon the earlier to
occur of its adoption by the Board of Directors or its approval by the
stockholders of the Company as described in Section 17 of the Plan.  It shall
continue in effect for a term of ten (10) years unless sooner terminated under
Section 13 of the Plan.

     7.   TERM OF OPTION.  The term of each Option shall be ten (10) years from
the date of grant thereof or such shorter term as may be provided in the Option
Agreement.  However, in the case of an Option granted to an Optionee who, at the
time the 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 term of the Option shall be five (5) years from the date of
grant thereof or such shorter term as may be provided in the Option Agreement.

     8.   EXERCISE PRICE AND CONSIDERATION.

          (a)  The per Share exercise price for the Shares to be issued pursuant
to exercise of an Option shall be such price as is determined by the Board, but
shall be subject to the following:

               (i)   In the case of an Incentive Stock Option

                     (A) granted to an Employee who, at the time of the grant of
such Incentive Stock Option, 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, 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.

          (b)  The consideration to be paid for the Shares to be issued upon
exercise of an Option, including the method of payment, shall be determined by
the Administrator and may consist entirely of(1) cash, (2) check, (3) promissory
note, (4) other Shares of Common Stock which (x) have been owned by the Optionee
for more than six (6) months on the date of surrender and (y) 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, (5) delivery of a properly
executed exercise notice together with such documentation as the Administrator
and the broker, if applicable, shall require to effect, an exercise of the
Option and delivery to the Company of the sale or loan proceeds required to pay
the exercise price, or (6) any combination of such methods of payment.  In
making its determination as to the type of consideration to accept, the Board
shall consider if acceptance of such consideration may be reasonably expected to
benefit the Company.

     9.   EXERCISE OF OPTION.


                                          4
<PAGE>

          (a)  PROCEDURE FOR EXERCISE RIGHTS AS A STOCKHOLDER.  Any Option
granted hereunder shall be exercisable at such times and under such conditions
as determined by the Board, including performance criteria with respect to the
Company and/or the Optionee, and as shall be permissible under the terms of the
Plan.

               An Option may not be exercised for a fraction of a Share.

               An Option shall be deemed to be exercised when written notice of
such exercise has been given to the Company in accordance with the terms of the
Option by the person entitled to exercise the Option and full payment for the
Shares with respect to which the Option is exercised has been received by the
Company.  Full payment may, as authorized by the Board, consist of any
consideration and method of payment allowable under Section 8(b) of the Plan.
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 stock
certificate evidencing such Shares, no right to vote or receive dividends or any
other rights as a stockholder shall exist with respect to the Optioned Stock,
notwithstanding the exercise of the Option.  The Company shall issue (or cause
to be issued) such stock certificate promptly upon exercise of the Option.

               Exercise of an Option in any manner shall result in a decrease in
the number of Shares which thereafter may be 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 STATUS AS AN EMPLOYEE OR CONSULTANT.  In the event
of termination of an Optionee's Continuous Status as an Employee or Consultant
(as the case may be), such Optionee may, but only within thirty (30) days (or
such other period of time, not exceeding three (3) months in the case of an
Incentive Stock Option as is determined by the Board, with such determination in
the case of an Incentive Stock Option being made at the time of grant of the
Option) after the date of such termination (but in no event later than the date
of expiration of the term of such Option as set forth in the Option Agreement),
exercise his Option to the extent that he was entitled to exercise it at the
date of such termination.  To the extent that he was not entitled to exercise
the Option at the date of such termination, or if he does not exercise such
Option (which he was entitled to exercise) within the time specified herein, the
Option shall terminate.

          (c)  DISABILITY OF OPTIONEE.  Notwithstanding the provisions of
Section 9(b) above, in the event of termination of an Optionee's Continuous
Status.  as an Employee or Consultant as a result of his total and permanent
disability (as defined in Section 22(e)(3) of the Code), he may, but only within
six (6) months (or such other period of time not exceeding twelve (12) months as
is determined by the Board, with such determination in the case of an Incentive
Stock Option being made at the time of grant of the Option) from the date of
such termination (but in no event later than the date of expiration of the term
of such Option as set forth in the Option Agreement), exercise his Option to the
extent he was entitled to exercise it at the date of such termination.  To the
extent that he was not entitled to exercise the Option at the date of
termination, or if he does not exercise such Option (which he was entitled to
exercise) within the time specified herein, the Option shall terminate.

          (d)  DEATH OF OPTIONEE.  In the event of the death of an Optionee
during the term of the Option who is at the time of his death an Employee or
Consultant of the Company and who shall have been in Continuous Status as an
Employee or Consultant since the date of grant of the Option, the Option may be
exercised, at any time within six (6) months following the date of death (but in
no event later than the date of expiration of the term of such Option as set
forth in the Option Agreement), by the Optionee's estate or by a person who
acquired the right to exercise the Option by bequest or inheritance, but only to
the extent of the right to exercise at the date of death.

          (e)  RULE 16b-3.  Options granted to persons subject to Section 16(b)
of the Exchange Act must comply with Rule 16b-3 and shall contain such
additional conditions or restrictions as may be required thereunder to qualify
for the maximum exemption from Section 16 of the Exchange Act with respect to
Plan transactions.


                                          5
<PAGE>

     10.  NON-TRANSFERABILITY OF OPTIONS.  The 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.

     11.  ADJUSTMENTS UPON CHANGES IN CAPITALIZATION OR MERGER.

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

          (b)  DISSOLUTION OR LIQUIDATION.  In the event of the proposed
dissolution or liquidation of the Company, the Board shall notify the Optionee
at least fifteen (15) days prior to such proposed action.  To the extent it has
not been previously exercised, the Option will terminate immediately prior to
the consummation of such proposed action.

          (c)  MERGER.  In the event of a merger of the Company with or into
another corporation, unless the Option is assumed or an equivalent option
substituted by the successor corporation or a parent or subsidiary of such
successor corporation, the Option shall terminate as of the date of the closing
of the merger; provided, however, that in the case of options granted prior to
October 30, 1992 or after the date upon which Company registers any class of any
equity security pursuant to Section 12 of the Exchange Act, if no such
assumption or substitution is granted by the successor corporation, the Board
shall, in lieu of such assumption or substitution, provide for the Optionee to
have the right to exercise the Option as to all of the Optioned Stock, including
Shares as to which the Option would not otherwise be exercisable.  If the Board
makes an Option fully exercisable in lieu of assumption or substitution in the
event of a merger, the Board shall notify the Optionee that the Option shall be
fully exercisable for a period of fifteen (15) days from the date of such
notice, and the Option will terminate upon the expiration of such period.

     12.  TIME OF GRANTING OPTIONS.  The date of grant of an Option shall, for
all purposes, be the date on which the Administrator makes the determination
granting such Option or such other date as is determined by the Administrator.
Notice of the determination shall be given to each Employee or Consultant to
whom an Option is so granted within a reasonable time after the date of such
grant.

     13.  AMENDMENT AND TERMINATION OF THE PLAN.

          (a)  AMENDMENT AND TERMINATION.  The Board may at any time amend,
alter, suspend or discontinue the Plan, but no amendment, alteration, suspension
or discontinuation shall be made which would impair the rights of any Optionee
under any grant theretofore made, without his or her consent.  In addition, to
the extent necessary and desirable to comply with Rule 16b-3 under the Exchange
Act or with Section 422 of the Code (or any other applicable law or regulation,
including the requirements of the NASD or an established stock exchange), the
Company shall obtain stockholder approval of any Plan amendment in such a manner
and to such a degree as required.

          (b)  EFFECT OF AMENDMENT OR TERMINATION.  Any such amendment or
termination of the Plan shall not affect Options already granted and such
Options shall remain in full force and effect as if this Plan had not


                                          6
<PAGE>

been amended or terminated, unless mutually agreed otherwise between the
Optionee and the Board, which agreement must be in writing and signed by the
Optionee and the Company.

     14.  CONDITIONS UPON ISSUANCE OF SHARES.  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 pursuant thereto shall comply with all
relevant provisions of law, including, without limitation, the Securities Act of
1933, as amended, the Exchange Act, the rules and regulations promulgated
thereunder, and the requirements of any stock exchange 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 relevant provisions of law.

     15.  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.

          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.

     16.  OPTION AGREEMENT.  Options shall be evidenced by written option
agreements in such form as the Board shall approve.

     17.  STOCKHOLDER APPROVAL.  Continuance of the Plan shall be subject to
approval by the stockholders of the Company within twelve (12) months before or
after the date the Plan is adopted.  Such stockholder approval shall be obtained
in the degree and manner required under applicable state and federal law.



                                          7
<PAGE>

                            QUICKTURN DESIGN SYSTEMS. INC.

                               1988 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

NAME

     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:
                                             -------------

     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.

     TERMINATION PERIOD:

     This Option may be exercised for 30 days after termination of the
Optionee's employment or consulting relationship with the Company.  Upon the
death or disability of the Optionee, this Option may be exercised for such
longer period as provided in the Plan.  In the event of the Optionee's change in
status from Employee to Consultant or Consultant to Employee, this Option
Agreement shall remain in effect.  In no event shall this Option be exercised
later than the Term/Expiration Date as provided above.


                                          1
<PAGE>

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 13(b) of the Plan, in the event of a conflict between the terms and
conditions of the Plan and the terms and conditions of this Option Agreement,
the terms and conditions of the Plan shall prevail.

     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, to the extent that the ISO 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.  In the event of
Optionee's death, disability or other termination of Optionee's employment or
consulting relationship, the exercisability of the Option is governed by 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 signed by
the Optionee and shall be delivered in person or by certified mail to the
Secretary 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 all relevant provisions of law and the
requirements of any stock exchange or quotation service upon which the Shares
are then listed.  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.

     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; or

          (b)  check;

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

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

          (e)  delivery of Optionee's promissory note (the "Note") in the form
attached hereto as EXHIBIT C, in the amount of the aggregate Exercise Price of
the Exercised Shares together with the execution and delivery by the Optionee of
the Security Agreement attached hereto as EXHIBIT B.  The Note shall bear
interest at a rate no less than the "applicable federal rate" prescribed under
the Code and its regulations at time of purchase, and shall be secured by a
pledge of the Shares purchased by the Note pursuant to the Security Agreement.


                                          2
<PAGE>

     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 tile 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 and state 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 and state 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, 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 equal to a percentage of this compensation income
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 or state 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 undergoes a change of status from Employee
to Consultant, any Incentive Stock Option of the Optionee that remains
unexercised shall cease to qualify as an Incentive Stock Option and will be
treated for tax purposes as a Non statutory Stock Option on the ninety-first
(91st) 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.

          (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.


                                          3
<PAGE>

     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.

                                        By:
- ------------------------------------         Keith R. Lobo, President & CEO
Signature

- ------------------------------------
Residence Address

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



                                          4

<PAGE>

                                                                    Exhibit 99.2

                               PI DESIGN SYSTEMS, INC.

                               1990 STOCK OPTION PLAN

                 Adopted by the Board of Directors on June 7, 1990
                 Approved by the Shareholders on September 19, 1990
                Amended by the Board of Directors on January 2, 1991
                  Approved by the Shareholders on January 3, 1991
               Amended by the Board of Directors on February 19, 1991
                   Approved by the Shareholders on March 4, 1991
              Amended by the Board of Directors on September 23, 1991
                  Approved by the Shareholders on October 16, 1991
                 Amended by the Board of Directors on April 9, 1992
                  Amended by the Board of Directors on May 1, 1992

     1.   PURPOSE.

          (a)  The purpose of the Plan is to provide a means by which selected
key employees and directors (if declared eligible under paragraph 4) of and
consultants to Pi Design Systems, Inc. a California corporation (the "Company"),
and its Affiliates, as defined in subparagraph 1(b), may be given an opportunity
to purchase stock of the Company.

          (b)  The word "Affiliate" as used in the Plan means any parent
corporation or subsidiary corporation of the Company, as those terms are defined
in Sections 425(e) and (f), respectively, of the Internal Revenue Code of 1986,
as amended from time to time (the "Code").

          (c)  The Company, by means of the Plan, seeks to retain the services
of persons now employed by or serving as consultants or directors to the
Company, to secure and retain the services of new employees/persons capable of
filling such positions, and to provide incentives for such persons to exert
maximum efforts for the success of the Company.

          (d)  The Company intends that the options issued under the Plan shall,
in the discretion of the Board of Directors of the Company (the "Board") or any
committee to which responsibility for administration of the Plan has been
delegated pursuant to subparagraph 2(c), be either incentive stock options as
that term is used in Section 422A of the Code ("Incentive Stock Options"), or
options which do not qualify as incentive stock options ("Supplemental Stock
Options").  All options shall be separately designated Incentive Stock Options
or Supplemental Stock Options at the time of grant, and in such form as issued
pursuant to paragraph 5, and a separate certificate or      -certificates shall
be issued for shares purchased on exercise of each type of option.  An option
designated as a Supplemental Stock Option shall not be treated as an incentive
stock option.

     2.   ADMINISTRATION.

          (a)  The Plan shall be administered by the Board unless and until the
Board delegates administration to a committee, as provided in subparagraph 2(c)
Whether or not the Board has delegated administration, the Board shall have the
final power to determine all questions of policy and expediency that may arise
in the administration of the Plan.

          (b)  The Board shall have the power, subject to, and within the
limitations of, the express provisions of the Plan:

               (1)  To determine from time to time which of the persons eligible
under the Plan shall be granted options; when and how the option shall be
granted; whether the option will be an Incentive Stock Option or a Supplemental
Stock Option; the provisions of each option granted (which need not be
identical),


<PAGE>

including the time or times during the term of each option within which all or
portions of such option may be exercised; and the number of shares for which an
option shall be granted to each such person.

               (2)  To construe and interpret the Plan and options granted under
it, and to establish, amend and revoke rules and regulations for its
administration.  The Board, in the exercise of this power, may correct any
defect, omission or inconsistency in the Plan or in any option agreement, in a
manner and to the extent it shall deem necessary or expedient to make the Plan
fully effective.

               (3)  To amend the Plan as provided in paragraph 10.

               (4)  Generally, to exercise such powers and to perform such acts
as the Board deems necessary or expedient to promote the best interests of the
Company.

          (c)  The Board may delegate administration of the Plan to a committee
composed of not fewer than three (3) members (the "Committee"), all of the
members of which Committee shall be disinterested persons, if required and as
defined by the provisions of subparagraph 2(d).  If administration is delegated
to a Committee, the Committee shall have, in connection with the administration
of the Plan, the powers theretofore possessed by the Board, subject, however, to
such resolutions, not inconsistent with the provisions of the Plan, as may be
adopted from time to time by the Board.  The Board may abolish the Committee at
any time and revest in the Board the administration of the Plan.  Additionally,
and notwithstanding anything to the contrary contained herein, the Board may
expressly determine that the requirement that the Committee be composed of three
(3) members be waived and may delegate administration of the Plan to any person
or persons and the term "Committee" shall apply to any person or persons to whom
such authority has been delegated.

          (d)  The term "disinterested person," as used in this Plan, shall mean
an administrator of the Plan, whether a member of the Board or of any Committee
to which responsibility for administration of the Plan has been delegated
pursuant to subparagraph 2(c):  (i) who is not at the time he or she exercises
discretion in administering the Plan eligible and has not at any time within one
year prior thereto been eligible for selection as a person to whom stock may be
allocated or to whom stock options or stock appreciation rights may be granted
pursuant to the Plan or any other plan of the Company or any of its affiliates
entitling the participants therein to acquire stock, stock options or stock
appreciation rights of the Company or any of its affiliates; or (ii) who is
otherwise considered to be a "disinterested person" in accordance with the
rules, regulations or interpretations of the Securities and Exchange Commission.
Any such person shall otherwise comply with the requirements of Rule 16b-3
promulgated under the Securities Exchange Act of 1934, as amended (the "Exchange
Act").

          (e)  Any requirement that an administrator of the Plan be a
"disinterested person" shall not apply [(i) prior to the date of the first
registration of an equity security of the Company under Section 12 of the
Exchange Act, or (ii)) if the Board or the Committee expressly declares that
such requirement shall not apply.

     3.   SHARES SUBJECT TO THE PLAN.

          (a)  Subject to the provisions of paragraph 9 relating to adjustments
upon changes in stock, the stock that may be sold pursuant to options granted
under the Plan shall not exceed in the aggregate one million seven hundred
twenty-five thousand (1,725,000) shares of the Company's common stock.  If any
option granted under the Plan shall for any reason expire or otherwise terminate
without having been exercised in full, the stock not purchased under such option
shall again become available for the Plan.

          (b)  The stock subject to the Plan may be unissued shares or
reacquired shares, bought on the market or otherwise.

          (c)  An Incentive Stock Option may be granted to an eligible person
under the Plan only if the aggregate fair market value (determined at the time
the option is granted) of the stock with respect to which incentive stock
options (as defined in the Code) granted after 1986 are exercisable for the
first time by such optionee during any calendar year under all incentive stock
option plans of the Company and its Affiliates does not exceed one


                                          2
<PAGE>

hundred thousand dollars ($100,000).  Should it be determined that an option
granted under the Plan exceeds such maximum for any reason other than the
failure of a good faith attempt to value the stock subject to the option, such
option shall be considered a Supplemental Stock Option to the extent, but only
to the extent, of such excess; provided, however, that should it be determined
that an entire option or any portion thereof does not qualify for treatment as
an incentive stock option by reason of exceeding such maximum, such option or
the applicable portion shall be considered a Supplemental Stock Option.

     4.   ELIGIBILITY.

          (a)  Incentive Stock Options may be granted only to employees
(including officers) of the Company or its Affiliates.  A director of the
Company shall not be eligible to receive Incentive Stock Options unless such
director is also an employee (including an officer) of the Company or any
Affiliate.  Supplemental Stock Options may be granted only to key employees
(including officers) of, directors of or consultants to the Company or its
Affiliates.  A director of the Company shall not be eligible for a Supplemental
Stock Option unless such director is also a key employee (including an officer)
of or consultant to the Company or any Affiliate.

          (b)  A director shall in no event be eligible for the benefits of the
Plan unless and until such director is expressly declared eligible to
participate in the Plan by action of the Board or the Committee, and only if, at
any time discretion is exercised by the Board in the selection of a director as
a person to whom options may be granted, or in the determination of the number
of shares which may be covered by options granted to a director:  (i) a majority
of the Board and a majority of the directors acting in such matter are
disinterested persons, as defined in subparagraph 2(d); (ii) the Committee
consists solely of "disinterested persons" as defined in subparagraph 2(d); or
(iii) the Plan otherwise complies with the requirements of Rule 16b-3
promulgated under the Exchange Act, as from time to time in effect.  The Board
shall otherwise comply with the requirements of Rule 16b-3 promulgated under the
Exchange Act, as from time to time in effect.  This subparagraph 4(b) shall not
apply prior to the date of the first registration of an equity security of the
Company under Section 12 of the Exchange Act.

          (c)  No person shall be eligible for the grant of an option under the
Plan if, at the time of grant, such person owns (or is deemed to own pursuant to
Section 425(d) of the Code) stock possessing more than ten percent (10%) of the
total combined voting power of all classes of stock of the Company or of any of
its Affiliates unless the exercise price of such option is at least one hundred
ten percent (110%) of the fair market value of such stock at the date of grant
and the term of the option does not exceed five (5) years from the date of
grant.

     5.   OPTION PROVISIONS.

     Each option shall be in such form and shall contain such terms and
conditions as the Board or the Committee shall deem appropriate.  The provisions
of separate options need not be identical, but each option shall include
(through incorporation of provisions hereof by reference in the option or
otherwise) the substance of each of the following provisions:

          (a)  The term of any option shall not be greater than ten (10) years
from the date it was granted.

          (b)  The exercise price of each Incentive Stock Option shall be not
less than one hundred percent (100%) of the fair market value of the stock
subject to the option on the date the option is granted.  The exercise price of
each Supplemental Stock Option shall be not less than eighty-five percent (85%)
of the fair market value of the stock subject to the option on the date the
option is granted.

          (c)  The purchase price of stock acquired pursuant to an option shall
be paid, to the extent permitted by applicable statutes and regulations, either
(i) in cash at the time the option is exercised, or (ii) at the discretion of
the Board or the Committee, either at the time of the grant or exercise of the
option, (A) by delivery to the Company of other common stock of the Company, (B)
according to a deferred payment or other arrangement (which may include, without
limiting the generality of the foregoing, the use of other common stock of the
Company)


                                          3
<PAGE>

with the person to whom the option is granted or to whom the option is
transferred pursuant to subparagraph 5(d), or (C) in any other form of legal
consideration that may be acceptable to the Board or the Committee.

     In the case of any deferred payment arrangement, interest shall be payable
at least annually and shall be charged at the minimum rate of interest necessary
to avoid the treatment as interest, under any applicable provisions of the Code,
of any amounts other than amounts stated to be interest under the deferred
payment arrangement.

          (d)  An option shall not be transferable except by will or by the laws
of descent and distribution, and shall be exercisable during the lifetime of the
person to whom the option is granted only by such person.

          (e)  The total number of shares of stock subject to an option may, but
need not, be allotted in periodic installments (which may, but need not, be
equal).  From time to time during each of such installment periods, the option
may become exercisable ("vest") with respect to some or all of the shares
allotted to that period, and may be exercised with respect to some or all of the
shares allotted to such period and/or any prior period as to which the option
was not fully exercised.  During the remainder of the term of the option (if its
term extends beyond the end of the installment periods)  the option may be
exercised from time to time with respect to any shares then remaining subject to
the option.  The provisions of this subparagraph 5(e) are subject to any option
provisions governing the minimum number of shares as to which an option may be
exercised.

          (f)  The Company may require any optionee, or any person to whom an
option is transferred under subparagraph 5(d), as a condition of exercising any
such option, (1) to give written assurances satisfactory to the Company as to
the optionee 5 knowledge and experience in financial and business matters and/or
to employ a purchaser representative reasonably satisfactory to the Company who
is knowledgeable and experienced in financial and business matters, and that he
or she is capable of evaluating, alone or together with the purchaser
representative, the merits and risks of exercising the option; and (2) to give
written assurances satisfactory to the Company stating that such person is
acquiring the stock subject to the option for such person's own account and not
with any present intention of selling or otherwise distributing the stock.
These requirements, and any assurances given pursuant to such requirements,
shall be inoperative if (i) the issuance of the shares upon the exercise of the
option has been registered under a then currently effective registration
statement under the Securities Act of 1933, as amended (the "Securities Act"),
or (ii) as to any particular requirement, a determination is made by counsel for
the Company that such requirement need not be met in the circumstances under the
then applicable securities laws.

          (g)  An option shall terminate three (3) months after termination of
the optionee's employment or relationship as a consultant or director with the
Company or an Affiliate, unless (i) such termination is due to such person's
permanent and total disability, within the meaning of Section 422A(c)(7) of the
Code, in which case the option may, but need not, provide that it may be
exercised at any time within one (1) year following such termination of
employment or relationship as a consultant or director; or (ii) the optionee
dies while in the employ of or while serving as a consultant or director to the
Company or an Affiliate, or within not more than three (3) months after
termination of such relationship, in which case the option may, but need not,
provide that it may be exercised at any time within eighteen (18) months
following the death of the optionee by the person or persons to whom the
optionee's rights under such option pass by will or by the laws of descent and
distribution; or -(iii) the option by its terms specifies either (a) that it
shall terminate sooner than three (3) months after termination of the optionee's
employment or relationship as a consultant or director, or (b) that it may be
exercised more than three (3) months after termination of such relationship with
the Company or an Affiliate.  This subparagraph 5(g) shall not be construed to
extend the term of any option or to permit anyone to exercise the option after
expiration of its term, nor shall it be construed to increase the number of
shares as to which any option is exercisable from the amount exercisable on the
date of termination of the optionee's employment or relationship as a consultant
or director.

          (h)  The option may, but need not, include a provision whereby the
optionee may elect at any time during the term of his or her employment or
relationship as a consultant or director with the Company or any Affiliate to
exercise the option as to any part or all of the shares subject to the option
prior to the stated vesting date of the option or of any installment or
installments specified in the option.  Any shares so purchased from any


                                          4
<PAGE>

unvested installment or option may be subject to a repurchase right in favor of
the Company or to any other restriction the Board or the Committee determines to
be appropriate.

          (i)  To the extent provided by the terms of an option, the optionee
may satisfy any federal, state or local tax withholding obligation relating to
the exercise of such option by any of the following means or by a combination of
such means:

               (1) tendering a cash payment; (2) authorizing the Company to
withhold from the shares of the common stock otherwise issuable to the
participant as a result of the exercise of the stock option a number of shares
having a fair market value less than or equal to the amount of the withholding
tax obligation; or (3) delivering to the Company owned and unencumbered shares
of the common stock having a fair market value less than or equal to the amount
of the withholding tax obligation.

     6.   COVENANTS OF THE COMPANY.

          (a)  During the terms of the options granted under the Plan, the
Company shall keep available at all times the number of shares of stock required
to satisfy such options.

          (b)  The Company shall seek to obtain from each regulatory commission
or agency having jurisdiction over the Plan such authority as may be required to
issue and sell shares of stock upon exercise of the options granted under the
Plan; provided, however, that this undertaking shall not require the Company to
register under the Securities Act either the Plan, any option granted under the
Plan or any stock issued or issuable pursuant to any such option.  If, after
reasonable efforts, the Company is unable to obtain from any such regulatory
commission or agency the authority which counsel for the Company deems necessary
for the lawful issuance and sale of stock under the Plan, the Company shall be
relieved from any liability for failure to issue and sell stock upon exercise of
such options unless and until such authority is obtained.

     7    USE OF PROCEEDS FROM STOCK.

     Proceeds from the sale of stock pursuant to options granted under the Plan
shall constitute general funds of the Company.

     8.   MISCELLANEOUS.

          (a)  Neither an optionee nor any person to whom an option is
transferred under subparagraph 5(d) shall be deemed to be the holder of, or to
have any of the rights of a holder with respect to, any shares subject to such
option unless and until such person has satisfied all requirements for exercise
of the option pursuant to its terms.

          (b)  Throughout the term of any option granted pursuant to the Plan,
the Company shall make available to the holder of such option, not later than
one hundred twenty (120) days after the close of each of the Company's fiscal
years during the option term, upon request, such financial and other information
regarding the Company as comprises the annual report to the shareholders of the
Company provided for in the bylaws of the Company.

          (c)  Nothing in the Plan or any instrument executed or option granted
pursuant thereto shall confer upon any eligible employee or optionee any right
to continue in the employ of the Company or any Affiliate (or to continue acting
as a consultant or director) or shall affect the right of the Company or any
Affiliate to terminate the employment or consulting relationship or directorship
of any eligible employee or optionee with or without cause.  In the event that
an optionee is permitted or otherwise entitled to take a leave of absence, the
Company shall have the unilateral right to (i) determine whether such leave of
absence will be treated as a termination of employment for purposes of
paragraph 5(g) hereof and corresponding provisions of any outstanding options,
and (ii) suspend or otherwise delay the time or times at which the shares
subject to the option would otherwise vest.


                                          5
<PAGE>

     9.   ADJUSTMENTS UPON CHANGES IN STOCK.

          (a)  If any change is made in the stock subject to the Plan, or
subject to any option granted under the Plan (through merger, consolidation,
reorganization, recapitalization, stock dividend, dividend in property other
than cash, stock split, liquidating dividend, combination of shares, exchange of
shares, change in corporate structure or otherwise), the Plan and outstanding
options will be appropriately adjusted in the class(es) and maximum number of
shares subject to the Plan and the class(es) and number of shares and price per
share of stock subject to outstanding options.

     (b)  In the event of:  (1) a merger or consolidation in which the Company
is not the surviving corporation; or (2) a reverse merger in which the Company
is the surviving corporation but the shares of the Company's common stock
outstanding immediately preceding the merger are converted by virtue of the
merger into other property, whether in the form of securities, cash or otherwise
then to the extent permitted by applicable law:  (i) any surviving corporation
shall assume any options outstanding under the Plan or shall substitute similar
options for those outstanding under the Plan, or (ii) such options shall
continue in full force and effect.  In the event any surviving corporation
refuses to assume or continue such options, or to substitute similar options for
those outstanding under the Plan, then, with respect to options held by persons
then performing services as employees or as consultants or directors for the
Company, as the case may be, the time during which such options may be exercised
shall be accelerated and the options terminated if not exercised prior to such
event.

     10.  AMENDMENT OF THE PLAN.

          (a)  The Board at any time, and from time to time, may amend the Plan.
However, except as provided in paragraph 9 relating to adjustments upon changes
in stock, no amendment shall be effective unless approved by the shareholders of
the Company within twelve (12) months before or after the adoption of the
amendment, where the amendment will:

               (i)   Increase the number of shares reserved for options under
the Plan;

               (ii)  Modify the requirements as to eligibility for participation
in the Plan (to the extent such modification requires shareholder approval in
order for the Plan to satisfy the requirements of Section 422A(b) of the Code);
or

               (iii) Modify the Plan in any other way if such modification
requires shareholder approval in order for the Plan to satisfy the requirements
of Section 422A(b) of the Code or to comply with the requirements of Rule 16b-3
promulgated under the Exchange Act.

          (b)  It is expressly contemplated that the Board may amend the Plan in
any respect the Board deems necessary or advisable to provide optionees with the
maximum benefits provided or to be provided under the provisions of the Code and
the regulations promulgated thereunder relating to employee incentive stock
options and/or to bring the Plan and/or incentive stock options granted under it
into compliance therewith.

          (c)  Rights and obligations under any option granted before amendment
of the Plan shall not be altered or impaired by any amendment of the Plan unless
(i) the Company requests the consent of the person to whom the option was
granted and (ii) such person consents in writing.

     11.  TERMINATION OR SUSPENSION OF THE PLAN.

          (a)  The Board may suspend or terminate the Plan at any time   Unless
sooner terminated, the Plan shall terminate ten (10) years from the date the
Plan is adopted by the Board or approved by the shareholders of the Company,
whichever is earlier.  No options may be granted under the Plan while the Plan
is suspended or after it is terminated.


                                          6
<PAGE>

          (b)  Rights and obligations under any option granted while the Plan is
in effect shall not be altered or impaired by suspension or termination of the
Plan, except with the consent of the person to whom the option was granted.

     12.  EFFECTIVE DATE OF PLAN.

     The Plan shall become effective as determined by the Board, but no options
granted under the Plan shall be exercised unless and until the Plan has been
approved by the shareholders of the Company, and, if required, an appropriate
permit has been issued by the Commissioner of Corporations of the State of
California.




                                          7

<PAGE>

                                                                    Exhibit 99.3

                            QUICKTURN DESIGN SYSTEMS, INC.

                          KEY EXECUTIVE STOCK OPTION PLAN

                       (As amended through October 15, 1993)

     1.   PURPOSES OF THE PLAN.  The purposes of this Stock Option Plan are (1)
to retain and reward the Company's key executives whose performance is necessary
to produce results which contribute to the long term growth and development of
the Company, and (2) to incentivize the Company's achievement of its revenue and
operating targets.

     Options granted hereunder may be either Incentive Stock Options (as defined
in Section 422 of the Code) or Nonstatutory Stock Options, as determined by the
Administrator at the time of grant of an option and subject to the applicable
provisions of Section 422 of the Code, as amended, and the regulations
promulgated thereunder.

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

          (a)  "ADMINISTRATOR" shall mean the Board or any of its committees
appointed pursuant to Section 4 of the Plan.

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

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

          (d)  "COMMITTEE" shall mean a committee appointed by the Board of
Directors in accordance with paragraph (a) of Section 4 of the Plan.

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

          (f)  "COMPANY" shall mean Quickturn Design Systems, Inc., a Delaware
corporation.

          (g)  "CONTINUOUS STATUS AS A KEY EXECUTIVE" shall mean the absence of
any interruption or termination of the employment relationship by the Company or
any Subsidiary.  Continuous Status as a Key Executive shall not be considered
interrupted in the case of sick leave, military leave, or any other leave of
absence approved by the Board; provided that such leave is for a period of not
more than 90 days or reemployment upon the expiration of such leave is
guaranteed by contract or statute, or unless provided otherwise pursuant to
Company policy.

          (h)  "KEY EXECUTIVE" shall mean an executive officer employed by the
Company or any Parent or Subsidiary of the Company.

          (i)  "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 National
market System of the National Association of Securities Dealers, Inc.  Automated
Quotation ("NASDAQ") System, its Fair Market Value shall be the closing sales
price for such stock (or the closing bid, if no sales were reported, as quoted
on such system or exchange 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;


<PAGE>

               (ii)   If the Common Stock is quoted on the NASDAQ System (but
not on the National Market System thereof) or regularly quoted by a recognized
securities dealer but selling prices are not reported, its Fair Market Value
shall be the mean between the high and low asked prices for the Common Stock or;

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

          (j)  "INCENTIVE STOCK OPTION" shall mean an Option intended to qualify
as an incentive stock option within the meaning of Section 422 of the Code.

          (k)  "NONSTATUTORY STOCK OPTION" shall mean an Option not intended to
qualify as an Incentive Stock Option.

          (1)  "OPTION" shall mean a stock option granted pursuant to the Plan.

          (m)  "OPTIONED STOCK" shall mean the Common Stock subject to an
Option.

          (n)  "OPTIONEE" shall mean a Key Executive who receives an Option.

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

          (p)  "PLAN" shall mean this Key Executive Stock Option Plan.

          (q)  "SHARE" shall mean a share of the Common Stock, as adjusted in
accordance with Section 11 or the Plan.

          (r)  "SUBSIDIARY" shall mean 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 11 of
the Plan, the maximum aggregate number of shares which may be optioned and sold
under the Plan is four hundred fifty thousand (450,000) shares of Common Stock.
The Shares may be authorized, but unissued, or reacquired Common Stock.

     If an Option should expire or become unexercisable for any reason without
having been exercised in full, the unpurchased Shares which were subject thereto
shall, unless the Plan shall have been terminated, become available for future
grant under the Plan.

     4.   ADMINISTRATION OF THE PLAN.

          (a)  Procedure.

               (i)    The Plan shall be administered by (A) the Board if the
Board may administer the Plan in compliance with Rule 16b-3 promulgated under
the Securities Exchange Act of 1934, as amended (the "Exchange Act") or any
successor thereto ("Rule 16b-3") with respect to a plan intended to qualify
thereunder as a discretionary plan, or (B) a committee designated by the Board
to administer the Plan, which committee shall be constituted in such a manner as
to permit the Plan to comply with Rule 16b-3 with respect to a plan intended to
qualify thereunder as a discretionary plan.  Once appointed, such committee
shall continue to serve in its designated capacity until otherwise directed by
the Board.  From time to time the Board, may increase the size of the committee
and appoint additional members thereof, remove members (with or without cause)
and appoint new members in substitution therefor, fill vacancies, however
caused, and remove all members of the committee and thereafter directly
administer the Plan, all to the extent permitted by Rule 16b-3 with respect to a
plan intended to qualify thereunder as a discretionary plan.


                                          2

<PAGE>

          (b)  POWERS OF THE ADMINISTRATOR.  Subject to the provisions of the
Plan and in the case of a Committee, 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 of the Common Stock, in
accordance with Section 2(i) of the Plan;

               (ii)   to select the Key Executives to whom Options may from time
to time be granted hereunder;

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

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

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

               (vi)   to determine the terms and conditions, not inconsistent
with the terms of the Plan, of any award granted-hereunder;

               (vii)  to determine the terms of vesting or to accelerate the
vesting of any Option granted under the Plan;

               (viii) 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.

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

     5.   ELIGIBILITY.

          (a)  A Key Executive may be granted either Nonstatutory Stock Options
or Incentive Stock Options.  A Key Executive who has been granted an Option may,
if he is otherwise eligible, be granted an additional Option or Options.

          (b)  Each Option shall be designated in the written option agreement
as either an Incentive Stock Option or a Nonstatutory Stock Option.  However,
notwithstanding such designations, to the extent that the aggregate Fair Market
Value of the Shares with respect to which Options designated as Incentive Stock
Options are exercisable for the first time by any Optionee during any calendar
year (under all plans of the Company or any Parent or Subsidiary) exceeds
$100,000, such excess Options shall be treated as Nonstatutory Stock Options.

          (c)  For purposes of Section 5(b), Incentive Stock Options shall be
taken into account in the order in which they were granted, and the Fair Market
Value of the Shares shall be determined as of the time the Option with respect
to such shares is granted.

          (d)  The Plan shall not confer upon any Optionee any right with
respect to continuation of employment with the Company, nor shall it interfere
in any way with his right or the Company's right to terminate his employment at
any time, with or without cause.

     6.   TERM OF PLAN.  The Plan shall become effective upon the earlier to
occur of its adoption by the Board of Directors or its approval by the
stockholders of the Company as described in Section 17 of the Plan.  It shall
continue in effect for a term of ten (10) years unless sooner terminated under
Section 13 of the Plan.


                                          3
<PAGE>

     7.   TERM OF OPTION.  The term of each Option shall be ten (10) years from
the date of grant thereof or such shorter term as may be provided in the Option
Agreement.  However, in the case of an Option granted to an Optionee who, at the
time the 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 term of the Option shall be five (5) years from the date of
grant thereof or such shorter term as may be provided in the Option Agreement.

     8.   EXERCISE PRICE AND CONSIDERATION.

          (a)  The per Share exercise price for the Shares to be issued pursuant
to exercise of an Option shall be such price as is determined by the Board, but
shall be subject to the following:

               (i)    In the case of an Incentive Stock Option

                      (A) granted to a Key Executive who, at the time of the
grant of such Incentive Stock Option, 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 Key Executive, 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

                      (A) granted to a Key Executive who, at the time of the
grant of such Option, 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 the grant.

                      (B) granted to any Key Executive, the per Share exercise
price shall be no less than 85% of the Fair Market Value per Share on the date
of grant.

          (b)  The consideration to be paid for the Shares to be issued upon
exercise of an Option, including the method of payment, shall be determined by
the Administrator and may consist entirely of (1) cash, (2) check, (3)
promissory note, (4) other Shares of Common Stock which (x) have been owned by
the Optionee for more than six (6) months on the date of surrender and (y) 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, (5)
authorization from the Company to retain from the total number of shares as to
which the Option is exercised that number of Shares having a Fair Market Value
on the date of exercise equal to the exercise price for the total number of
Shares as to which the Option is exercised, (6) delivery of a properly executed
exercise notice together with such documentation as the Administrator and the
broker, if applicable, shall require to effect, an exercise of the Option and
delivery to the Company of the sale or loan proceeds required to pay the
exercise price, or (7) any combination of such methods of payment, or (8) such
other consideration and method of payment for the issuance of Shares to the
extent permitted under applicable laws.  In making its determination as to the
type of consideration to accept, the Administrator shall consider if acceptance
of such consideration may be reasonably expected to benefit the Company.

     9.   EXERCISE OF OPTION.

          (a)  PROCEDURE FOR EXERCISE: RIGHTS AS A STOCKHOLDERS.  Any Option
granted hereunder shall be exercisable at such times and under such conditions
as determined by the Board, including performance criteria with respect to the
Company and/or the Optionee, and as shall be permissible under the terms of the
Plan.

          An Option may not be exercised for a fraction of a Share.


                                          4
<PAGE>

          An Option shall be deemed to be exercised when written notice of such
exercise has been given to the Company in accordance with the terms of the
Option by the person entitled to exercise the Option and full payment for the
Shares with respect to which the Option is exercised has been received by the
Company.  Full payment may, as authorized by the Board, consist of any
consideration and method of payment allowable under Section 8(b) of the Plan.
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 stock
certificate evidencing such Shares, no right to vote or receive dividends or any
other rights as a stockholder shall exist with respect to the Optioned Stock,
notwithstanding the exercise of the Option.  The Company shall issue (or cause
to be issued) such stock certificate promptly upon exercise of the Option.

          Exercise of an Option in any manner shall result in a decrease in the
number of Shares which thereafter may be 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 STATUS AS A KEY EXECUTIVE.  In the event of
termination of an Optionee's Continuous Status as a Key Executive, such Optionee
may, but only within thirty (30) days (or such other period of time, not
exceeding three (3) months in the case of an Incentive Stock Option as is
determined by the Board, with such determination in the case of an Incentive
Stock Option being made at the time of grant of the Option) after the date of
such termination (but in no event later than the date of expiration of the term
of such Option as set forth in the Option Agreement), exercise his Option to the
extent that he was entitled to exercise it at the date of such termination.  To
the extent that he was not entitled to exercise the Option at the date of such
termination, or if he does not exercise such Option (which he was entitled to
exercise) within the time specified herein, the Option shall terminate.

          (c)  DISABILITY OF OPTIONEE.  Notwithstanding the provisions of
Section 9(b) above, in the event of termination of an Optionee's Continuous
Status as a Key Executive as a result of his total and permanent disability (as
defined in Section 22(e)(3) of the Code), he may, but only within six (6) months
(or such other period of time not exceeding twelve (12) months as is determined
by the Board, with such determination in the case of an Incentive Stock Option
being made at the time of grant of the Option) from the date of such termination
(but in no event later than the date of expiration of the term of such Option as
set forth in the Option Agreement), exercise his Option to the extent he was
entitled to exercise it at the date of such termination.  To the extent that he
was not entitled to exercise the Option at the date of termination, or if he
does not exercise such Option (which he was entitled to exercise) within the
time specified herein, the Option shall terminate.

          (d)  DEATH OF OPTIONEE.  In the event of the death of an Optionee
during the term of the Option who is at the time of his death a Key Executive of
the Company and who shall have been in continuous Status as an Key Executive
since the date of grant of the Option, the Option may be exercised, at any time
within six (6) months following the date of death (but in no event later than
the date of expiration of the term of such Option as set forth in the Option
Agreement), by the Optionee's estate or by a person who acquired the right to
exercise the Option by bequest or inheritance, but only to the extent of the
right to exercise that would have accrued as of the date of death; provided,
however, that in the event of the death of the Optionee during the first twelve
(12) months of employment, Option shall be vested through the date of death at
the rate of 1/48 of the Shares per month.

          (e)  RULE 16b-3.  Options granted to persons subject to Section 16(b)
of the Exchange Act must comply with Rule 16b-3 and shall contain such
additional conditions or restrictions as may be required thereunder to qualify
for the maximum exemption from Section 16 of the Exchange Act with respect to
Plan transactions.

     10.  NON-TRANSFERABILITY OF OPTIONS.  The 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.


                                          5
<PAGE>

     11.  ADJUSTMENTS UPON CHANGES IN CAPITALIZATION OR MERGER.

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

          (b)  DISSOLUTION OR LIQUIDATION.  In the event of the proposed
dissolution or liquidation of the Company, the Board shall notify the Optionee
at least fifteen (15) days prior to such proposed action.  To the extent it has
not been previously exercised, the Option will terminate immediately prior to
the consummation of such proposed action.

          (c)  MERGER.  In the event of a merger of the Company with or into
another corporation, unless the Option is assumed or an equivalent option
substituted by the successor corporation or a parent or subsidiary of such
successor corporation, the Option shall terminate as of the date of the closing
of the merger.

     12.  TIME OF GRANTING OPTIONS.  The date of grant of an Option shall, for
all purposes, be the date on which the Administrator makes the determination
granting such Option or such other date as is determined by the Administrator.
Notice of the determination shall be given to each Key Executive to whom an
Option is so granted within a reasonable time after the date of such grant.

     13.  AMENDMENT AND TERMINATION OF THE PLAN.

          (a)  AMENDMENT AND TERMINATION.  The Board may at any time amend,
alter, suspend or discontinue the Plan, but no amendment, alteration, suspension
or discontinuation shall be made which would impair the rights of any Optionee
under any grant theretofore made, without his or her consent.  In addition, to
the extent necessary and desirable to comply with Rule 16b-3 under the Exchange
Act or with Section 422A of the Code (or any other applicable law or regulation,
including the requirements of the NASD or an established stock exchange), the
Company shall obtain stockholder approval of any Plan amendment in such a manner
and to such a degree as required.

          (b)  EFFECT OF AMENDMENT OR TERMINATION.  Any such amendment or
termination of the Plan shall not affect Options already granted and such
Options shall remain in full force and effect as if this Plan had not been
amended or terminated, unless mutually agreed otherwise between the Optionee and
the Board, which agreement must be in writing and signed by the Optionee and the
Company.

     14.  CONDITIONS UPON ISSUANCE OF SHARES.  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 pursuant thereto shall comply with all
relevant provisions of law, including, without limitation, the Securities Act of
1933, as amended, the Exchange Act, the rules and regulations promulgated
thereunder, and the requirements of any stock exchange upon which the Shares may
then be listed, and shall be further subject to the 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


                                          6
<PAGE>

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 relevant provisions of law.

     15.  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.

     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.

     16.  OPTION AGREEMENT.  Options shall be evidenced by written option
agreements in such form as the Board shall approve.

     17.  STOCKHOLDER APPROVAL.

          (a)  Continuance of the Plan shall be subject to approval by the
stockholders of the Company within twelve (12) months before or after the date
the Plan is adopted.  Such stockholder approval shall be obtained in the degree
and manner required under applicable state and federal law.

     18.  INFORMATION TO OPTIONEES.  The Company shall provide to each Optionee,
during the period for which such Optionee has one or more Options outstanding,
and to each individual who acquired shares pursuant to the exercise of an
option, copies of all annual reports and other information which are provided to
all stockholders of the Company.  The Company shall not be required to provide
such information if the issuance of Options under the Plan is limited to Key
Executives whose duties in connection with the Company assure their access to
equivalent information.


                                          7
<PAGE>

                               QUICKTURN SYSTEMS, INC.

                          INCENTIVE STOCK OPTION AGREEMENT

     Quickturn Systems, Inc., a California corporation (the "Company"), has
granted to _________ (the "Optionee"), an option (the "Option") to purchase a
total of _______ shares of Common Stock (the "Shares"), at the price determined
as provided herein, and in all respects subject to the terms, definitions and
provisions of the Key Executive Stock Option Plan (the "Plan") adopted by the
Company, which is incorporated herein by reference.  Unless otherwise defined
herein, the terms defined in the Plan shall have the same defined meanings
herein.

     1.   NATURE OF THE OPTION.  This Option is intended to qualify as an
Incentive Stock Option as defined in Section 422 of the Code.

     2.   EXERCISE PRICE.  The exercise price is ______ for each share of Common
Stock, which price is not less than the fair market value per share of the
Common Stock on the date of grant.

     3.   EXERCISE OF OPTION.  This Option shall be exercisable during its term
in accordance with the provisions of Section 9 of the Plan as follows:

          (i)   RIGHT TO EXERCISE.

                (a)  Subject to subsections 3(i)(b), (c), (d) and (e) below,
this Option shall be exercisable cumulatively, to the extent of 1/6 of the
Shares subject to the Option on the date 12 months after ______________ (the
"Vesting Commencement Date") and 1/72 of the Shares subject to the Option for
each one-month period thereafter; provided, however, that such vesting schedule
shall be adjusted to provide that this Option shall be exercisable cumulatively,
to the extent of 1/4 of the Shares subject to the Option on the date 12 months
after the Vesting Commencement Date and 1/48 of the Shares subject to the Option
for each one-month period thereafter in the event any one of the following
occurs:  (i) achievement by the Company of its projected revenue and operating
profit goals set forth in the 1993 Operating Plan approved by the Board of
Directors or in any Operating Plan for a subsequent fiscal year which has been
approved by the Board of Directors, (ii) a Change of Control (as defined in
subsection (e) below) or (iii) involuntary termination of Optionee's employment
without Cause (as defined in subsection (e) below).  This Option may be
exercised in whole or in part at any time, as to Shares which have not yet
vested under the above vesting schedule; provided, however, that the Optionee
shall execute, as a condition to such exercise of this Option, the Restricted
Stock Purchase Agreement attached hereto as Exhibit A.

                (b)  This Option may not be exercised for a fraction of a share.

                (c)  In the event of Optionee's death, disability or other
termination of employment, the exercisability of the Option is governed by
Sections 7, 8 and 9 below, subject to the limitations contained in subsection
3(i) (d)

                (d)  In no event may this Option be exercised after the date of
expiration of the term of this Option as set forth in Section 11 below.

                (e)  If, within 12 months after a Change of Control, Optionee's
employment is involuntarily terminated other than for Cause or Constructively
Terminated, then Optionee's stock options shall be accelerated with respect to
that number of Shares which would have vested after 24 months of additional
employment.  For purposes of the foregoing, termination "for Cause" shall mean
(i) the willful failure by Optionee substantially to perform Optionee's material
duties after a written demand for substantial performance is delivered to
Optionee by the Board of Directors which specifically identifies the manner in
which the Board of Directors believes that Optionee has not substantially
performed Optionee's duties, (ii) the failure (in a material respect) by
Optionee to follow reasonable policies or directives established by the Board of
Directors of the Company after written notice to Optionee by the Board of
Directors that Optionee is not following such policies or directives, (iii) bad
faith conduct


<PAGE>

that is materially detrimental to the Company, or (iv) the conviction of
Optionee of any crime involving the property or business of the Company or its
affiliates.  For purposes of the foregoing, a "Change of Control" shall be
deemed to have occurred if (i) the Company sells or otherwise disposes of all or
substantially all of its assets; (ii) there is a merger or consolidation of the
Company with any other entity, provided that the shareholders of the Company, as
a group, do not hold, immediately after such event, at least 50% of the voting
power of the surviving or successor entity; (iii) any person or entity,
including any "person" as such term is used in Section 13(d) (3) of the
Securities Exchange Act of 1934, as amended (the "Exchange Act"), becomes the
"beneficial owner" (as defined in the Exchange Act) of Common Stock of the
Company representing 50% or more of the combined voting power of the voting
securities of the Company (exclusive of persons who are no officers or directors
of the Company) .  For purposes of the foregoing, Optionee's employment with the
Company shall be deemed to have been "Constructively Terminated" in the event of
a material decrease in Optionee's responsibility or authority.

          (ii)  METHOD OF EXERCISE.  This Option shall be exercisable by written
notice which shall state the election to exercise the Option, the number of
Shares in respect of which the Option is being exercised, and such other
representations and agreements as to the holder's investment intent with respect
to such shares of Common Stock as may be required by the Company pursuant to the
provisions of the Plan.  Such written notice shall be signed by the Optionee and
shall be delivered in person or by certified mail to the Secretary of the
Company.  The written notice shall be accompanied by payment of the Exercise
Price.  This Option shall be deemed to be exercised upon receipt by the Company
of such written notice accompanied by the Exercise Price

     No Shares will be issued pursuant to the exercise of an Option unless such
issuance and such exercise shall comply with all relevant provisions of law and
the requirements of any stock exchange upon which the Shares may then be listed.
Assuming such compliance, for income tax purposes the Shares shall be considered
transferred to the Optionee on the date on which the Option is exercised with
respect to such Shares.

     4.   OPTIONEE'S REPRESENTATIONS.  In the event the Shares purchasable
pursuant to the exercise of this Option have not been registered under the
Securities Act of 1933, as amended, at the time this Option is exercised,
Optionee shall, concurrently with the exercise of all or any portion of this
Option, deliver to the Company his Investment Representation Statement in the
form attached hereto as Exhibit B, and shall read the applicable rules of the
Commissioner of Corporations attached to such Investment Representation
Statement.

     5.   METHOD OF PAYMENT.  Payment of the exercise price shall be by any of
the following, or a combination thereof, at the election of the Optionee:

          (i)   cash;

          (ii)  check;

          (iii) surrender of other shares of Common Stock of the Company which
(A) in the case of Shares acquired pursuant to the exercise of a Company option,
have been owned by the Optionee for more than six (6) months on the date of
surrender, and (B) have a Fair Market Value on the date of surrender equal to
the Exercise Price of the Shares as to which the Option is being exercised; or

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

     6.   RESTRICTIONS ON EXERCISE.  This Option may not be exercised until such
time as the Plan has been approved by the shareholders of the Company, or if the
issuance of such Shares upon such exercise or the method of payment of
consideration for such shares would constitute a violation of any applicable
federal or state securities or other law or regulation, including any rule under
Part 207 of Title 12 of the Code of Federal Regulations ("Regulation G") as
promulgated by the Federal Reserve Board.  As a condition to the exercise of
this Option, the Company may require Optionee to make any representation and
warranty to the Company as may be required by any applicable law or regulation.


                                          2
<PAGE>

     7.   TERMINATION OF STATUS AS AN EMPLOYEE.  In the event of termination of
Optionee's Continuous Status as an Employee or Consultant, he may, but only
within ninety (90) days after the date of such termination (but in no event
later than the date of expiration of the term of this Option as set forth in
Section 11 below), exercise this Option to the extent that he was entitled to
exercise it at the date of such termination.  To the extent that he was not
entitled to exercise this Option at the date of such termination, or if he does
not exercise this Option within the time specified herein, the Option shall
terminate.

     8.   DISABILITY OF OPTIONEE.  Notwithstanding the provisions of Section 7
above, in the event of termination of Optionee's Continuous Status as an
Employee or Consultant as a result of his total and permanent disability (as
defined in Section 22(e)(3) of the Code), he may, but only within six months
from the date of termination of employment (but in no event later than the date
of expiration of the term of this Option as set forth in Section 11 below),
exercise his Option to the extent he was entitled to exercise it at the date of
such termination.  To the extent that he was not entitled to exercise the Option
at the date of termination, or if he does not exercise such Option (which he was
entitled to exercise) within the time specified herein, the Option shall
terminate.

     9.   DEATH OF OPTIONEE.  In the event of the death of Optionee the Option
may be exercised, at any time within six (6) months following the date of death
(but in no event later than the date of expiration of the term of this Option as
set forth in Section 11 below), by Optionee's estate or by a person who acquired
the right to exercise the Option by bequest or inheritance, but only to the
extent of the right to exercise that had accrued at the date of death; provided,
however, in the event of the death of Optionee during the first twelve (12)
months after the Vesting Commencement Date, this Option shall be vested through
the date of death at the rate of 1/48th of the Shares for each month elapsed
after the Vesting Commencement Date.

     10.  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 him.  The terms of this
Option shall be binding upon the executors, administrators, heirs, successors
and assigns of the Optionee.

     11.  TERM OF OPTION.  This Option may not be exercised more than ten (10)
years (five years if Optionee owns, immediately before this Option is granted,
stock representing more than 10 percent of the total combined voting power of
all classes of stock of the Company or of any Parent or Subsidiary) from the
date of grant of this Option, and may be exercised during such term only in
accordance with the Plan and the terms of this Option.

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

               (i)   EXERCISE OF ISO.  If this Option qualifies as an ISO, there
will be no regular federal income tax liability or California income tax
liability upon the exercise of the Option, although the excess, if any, of the
Fair Market Value of the Shares on the date of exercise over the Exercise Price
will be treated as an adjustment to the alternative minimum tax for federal tax
purposes and may subject the Optionee to the alternative minimum tax in the year
of exercise.

               (ii)  EXERCISE OF NONSTATUTORY STOCK OPTIONS.   If this Option
does not qualify as an ISO, there may be a regular federal income tax liability
and a California income tax liability upon the exercise of the Option.  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 Shares on the date of exercise over the Exercise Price.  If Optionee is
an employee, the Company will be required to withhold from Optionee's
compensation or collect from Optionee and pay to the applicable taxing
authorities an amount equal to a percentage of this compensation income at the
time of exercise.


                                          3
<PAGE>

               (iii) DISPOSITION OF SHARES.  In the case of an NSO, if Shares
are held for at least one year, any gain realized on disposition of the Shares
will be treated as long-term capital gain for federal and California income tax
purposes.  In the case of an ISO, if Shares transferred pursuant to the Option
are held for at least one year after exercise and are disposed of at least two
years after the Date of Grant, any gain realized on disposition of the Shares
will also be treated as long-term capital gain for federal and California income
tax purposes.  If Shares purchased under an ISO are disposed of within such
one-year period or within two years after the Date of Grant, any gain realized
on such disposition will be treated as compensation income (taxable at ordinary
income rates) to the extent of the excess, if any, of the Fair Market Value of
the Shares on the date of exercise over the Exercise Price.

               (iv)  NOTICE OF DISQUALIFYING DISPOSITION OF ISO SHARES.  If the
Option granted to Optionee herein is an ISO, and if Optionee sells or otherwise
disposes of any of the Shares acquired pursuant to the ISO on or before the
later of (1) the date two years after the Date of Grant, or (2) the date one
year after the date of exercise, the Optionee shall immediately notify the
Company in writing of such disposition.  Optionee agrees that Optionee may be
subject to income tax withholding by the Company on the compensation income
recognized by the Optionee from the early disposition by payment in cash or out
of the current earnings paid to the Optionee.

DATE OF GRANT:
                                        QUICKTURN SYSTEMS, INC.,
                                        a California corporation

                                        By:
                                           -------------------------------------

                                        Title:
                                              ----------------------------------


                                          4
<PAGE>

     OPTIONEE ACKNOWLEDGES AND AGREES THAT THE VESTING OF SHARES PURSUANT TO
SECTION 3 HEREOF IS EARNED ONLY BY CONTINUING EMPLOYMENT AT THE WILL OF THE
COMPANY (NOT THROUGH THE ACT OF BEING HIRED, BEING GRANTED THIS OPTION OR
ACQUIRING SHARES HEREUNDER).  OPTIONEE FURTHER ACKNOWLEDGES AND AGREES THAT
NOTHING IN THIS AGREEMENT, NOR IN THE COMPANY'S STOCK OPTION PLAN WHICH IS
INCORPORATED HEREIN BY REFERENCE, SHALL CONFER UPON OPTIONEE ANY RIGHT WITH
RESPECT TO CONTINUATION OF EMPLOYMENT BY THE COMPANY, NOR SHALL IT INTERFERE IN
ANY WAY WITH HIS RIGHT OR THE COMPANY'S RIGHT TO TERMINATE HIS EMPLOYMENT AT ANY
TIME, WITH OR WITHOUT CAUSE.

     Optionee acknowledges receipt of a copy of the Plan and certain information
related thereto and represents that he is familiar with the terms and provisions
thereof, and hereby accepts this Option subject to all of the terms and
provisions thereof.  Optionee has reviewed the Plan and this Option in their
entirety, has had an opportunity to obtain the advice of counsel prior to
executing this Option and fully understands all provisions of the Option.
Optionee hereby agrees to accept as binding, conclusive and final all decisions
or interpretations of the Board upon any questions arising under the Plan.
Optionee further agrees to notify the Company upon any change in the residence
address indicated below.

Dated:
       ----------------------
                                        -----------------------------
                                        Optionee

                                        Residence Address:

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

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




                                          5

<PAGE>


                                                                 EXHIBIT 99.4

                           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 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.

<PAGE>

               (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 (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.

                                          7
<PAGE>


     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.

     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.


                                          8
<PAGE>

     7.   GRANT OF OPTION.

               (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 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.


                                          9
<PAGE>

     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.

               (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.


                                          10
<PAGE>

               (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.

               (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.


                                          11
<PAGE>

     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.

     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.

     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.


                                          12
<PAGE>

     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 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.


                                          13
<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 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.


                                          14
<PAGE>

     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

                ___________________________________________
               (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


                                          15
<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:__________________________


                                          16


<PAGE>

                                                                 EXHIBIT 99.5

                           QUICKTURN DESIGN SYSTEMS, INC.

                            1996 SUPPLEMENTAL STOCK 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 key Employees, Directors and
Consultants, and

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

          Options granted under the Plan will be Nonstatutory Stock Options.

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

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

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

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

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

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


                                      17

<PAGE>

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

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

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

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

          (n)  "NONSTATUTORY STOCK OPTION" means an Option not intended to
qualify as an incentive stock option within the meaning of Section 422 of the
Code and the regulations promulgated thereunder.

          (o)  "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.

          (p)  "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.

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

          (r)  "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.

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

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

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

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

          (w)  "PLAN" means this 1996 Supplemental Stock Plan.

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

          (y)  "SHARE" means a share of the Common Stock, as adjusted in
accordance with Section 13 of the Plan.

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


                                          18
<PAGE>

     3.   STOCK SUBJECT TO THE PLAN.  Subject to the provisions of Section 13 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.  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).  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, except that if unvested Shares are repurchased by the Company at
their original purchase price, such Shares shall become available for future
grant under the Plan.

     4.   ADMINISTRATION OF THE PLAN.

          (a)  PROCEDURE.  The Plan shall be administered by (A) the Board or
(B) a Committee, which committee shall be constituted to satisfy Applicable
Laws.

          (b)  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.

          (c)  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 of the Common Stock, in
accordance with Section 2(m)  of the Plan;

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

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

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

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

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

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

               (viii) to institute an Option Exchange Program;

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

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


                                          19
<PAGE>

               (xi)   to modify or amend each Option (subject to Section 15(b)
of the Plan), including the discretionary authority to extend the post-
termination exercisability period of Options longer than is otherwise provided
for in the Plan;

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

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

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

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

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

     5.   ELIGIBILITY.  Options may be granted to Service Providers.

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

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

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

     9.   OPTION EXERCISE PRICE AND CONSIDERATION.

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

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

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

               (I)    cash;

               (ii)   check;

               (iii)  promissory note;



                                          20
<PAGE>

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

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

     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.  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 13 of the Plan.

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

          (b)  TERMINATION OF RELATIONSHIP AS A SERVICE PROVIDER.  If an
Optionee ceases to be a Service Provider, other than upon the Optionee's death
or Disability, the Optionee may exercise his or her Option, but only within such
period of time as is specified in the Option Agreement, and only to the extent
that the Option is vested on the date of termination (but in no event later than
the expiration of the term of such Option as set forth in the Option Agreement).
In the absence of a specified time in the Option Agreement, the Option shall
remain exercisable for 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.


                                          21
<PAGE>

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.

     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.


                                          22
<PAGE>

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

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

     14.  AMENDMENT AND TERMINATION OF THE PLAN.

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

          (b)  EFFECT OF AMENDMENT OR TERMINATION.  No amendment, alteration,
suspension or termination of the Plan shall impair the rights of any Optionee,
unless mutually agreed otherwise between the Optionee and the Administrator,
which agreement must be in writing and signed by the Optionee and the Company.
Termination of the Plan shall not affect the Administrator's ability to exercise
the powers granted to it hereunder with respect to options granted under the
Plan prior to the date of such termination.

     15.  CONDITIONS UPON ISSUANCE OF SHARES.

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

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

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

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


                                          23
<PAGE>

                           QUICKTURN DESIGN SYSTEMS, INC.

                            1996 SUPPLEMENTAL STOCK PLAN

                               STOCK OPTION AGREEMENT

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

I.   NOTICE OF STOCK OPTION GRANT

[Optionee's Name and Address]

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

     Grant Number                             _______________________

     Date of Grant                           _______________________

     Vesting Commencement Date           _______________________

     Exercise Price per Share       $_______________________

     Total Number of Shares Granted           _______________________

     Total Exercise Price                     $_______________________

     Type of Option:               Nonstatutory Stock Option

     Term/Expiration Date:                   _______________________

     VESTING SCHEDULE:

     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 your continuing to be a Service Provider
on such dates.

     TERMINATION PERIOD:

     This Option may be exercised for 30 days after Optionee ceases to be a
Service Provider.  Upon the death or Disability of the Optionee, this Option may
be exercised for such longer period as provided in the Plan.  In no event shall
this Option be exercised later than the Term/Expiration Date as provided above.

II.  AGREEMENT

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


                                          24
<PAGE>

by reference.  Subject to Section 15(b) of the Plan, in the event of a conflict
between the terms and conditions of the Plan and the terms and conditions of
this Option Agreement, the terms and conditions of the Plan shall prevail.

     2.   EXERCISE OF OPTION.

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

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

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

          (a)  cash;

          (b)  check;

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

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

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

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

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

          (a)  EXERCISING THE OPTION.  The Optionee may incur regular federal
income tax liability upon exercise of an NSO.  The Optionee will be treated as
having received compensation income (taxable at ordinary income tax rates) equal
to the excess, if any, of the Fair Market Value of the Exercised Shares on the
date of exercise over their aggregate Exercise Price.  If the Optionee is an
Employee or a former Employee, the Company


                                          25
<PAGE>

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.

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

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

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

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

     OPTIONEE:                          QUICKTURN DESIGN SYSTEMS, INC.

     ______________________________     ______________________________________
     Signature                          By

     ______________________________     ______________________________________
     Print Name                         Title

     ______________________________
     Residence Address

     ______________________________


                                          26
<PAGE>

                                     EXHIBIT A

                            1996 SUPPLEMENTAL STOCK PLAN

                                  EXERCISE NOTICE

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

Attention:     Secretary

     1.   EXERCISE OF OPTION. Effective as of today, ________________, 199__,
the undersigned ("Purchaser") hereby elects to purchase ______________ shares
(the "Shares") of the Common Stock of Quickturn Design Systems, Inc. (the
"Company") under and pursuant to the 1996 Supplemental Stock 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 13 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.


                                          27
<PAGE>

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

 Submitted by:                           Accepted by:

 PURCHASER:                              QUICKTURN DESIGN SYSTEMS, INC.

 __________________________________      _____________________________________
 Signature                               By:


 __________________________________      _____________________________________
 Print Name                              Its:

 Address:                                Address:


 _________________________________       440 Clyde Avenue
 _________________________________       Mountain View, CA  94043


                       _____________________________________
                                    Date Received




                                          28

<PAGE>

                                                                 EXHIBIT 99.6

                           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.

          (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

                                       29

<PAGE>

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.

          (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.


                                          30
<PAGE>

          (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.

          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;

                                          31
<PAGE>

               (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 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,
provided that no such action shall be taken unless and until the approval of the
Company's stockholders shall have been obtained;

               (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.

     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


                                          32
<PAGE>

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 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.


                                          33
<PAGE>

               (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;

               (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


                                          34
<PAGE>

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.

          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.

     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.


                                          35
<PAGE>

          (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 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.


                                          36
<PAGE>

          (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.

          (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.



                                          37
<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].

     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


                                          38
<PAGE>

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.

     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.


                                          39
<PAGE>

               (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 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, AND SHALL
NOT


                                          40
<PAGE>

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


                                          41
<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



                                          42

<PAGE>

                                                                   Exhibit 99.7

                                     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
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.


                                          1
<PAGE>

 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.

                      1994 OUTSIDE DIRECTOR STOCK OPTION PLAN

     1.   PURPOSES OF THE PLAN.  The purposes of this 1994 Outside Director
Stock Option Plan are to attract and retain the best available personnel for
service as Outside Directors (as defined herein) of the Company, to provide
additional incentive to the Outside Directors of the Company to serve as
Directors, and to encourage their continued service on the Board.

          All options granted hereunder shall be "nonstatutory stock options."

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

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

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

          (c)  "COMMON STOCK" means the common stock, $.001 par value, of the
Company.

          (d)  "COMPANY" means Quickturn Design Systems, Inc., a Delaware
corporation.

          (e)  "CONTINUOUS STATUS AS A DIRECTOR" means the absence of any
interruption or termination of service as a Director.

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

          (g)  "EMPLOYEE" means any person, including officers and Directors,
employed by the Company or any Parent or Subsidiary of the Company.  The payment
of a Director's fee by the Company shall not be sufficient in and of itself to
constitute "employment" by the Company.

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

          (i)  "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, 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 system or exchange (or the exchange with the
greatest volume of trading in Common Stock) on the last market trading day prior
to the date of determination, as reported in The Wall Street Journal or such
other source as the Board deems reliable;

               (ii)   If the Common Stock is quoted on the National Association
of Securities Dealers, Inc.  Automated Quotation System (but not on the Nasdaq
National Market thereof) or 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 bid and 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 Board deems reliable, or;

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

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


                                          1
<PAGE>

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

          (1)  "OPTIONEE" means an Outside Director who receives an Option.

          (m)  "OUTSIDE DIRECTOR" means a Director who is not an Employee.

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

          (o)  "PLAN" means this 1994 Outside Director Stock Option Plan.

          (p)  "SHARE" means a share of the Common Stock, as adjusted in
accordance with Section 10 of the Plan.

          (q)  "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 10 of
the Plan, the maximum aggregate number of Shares which may be optioned and sold
under the Plan is 150,000 Shares (the "Pool") of Common Stock.  The Shares may
be authorized but unissued, or reacquired Common Stock.

          If an Option should expire or become unexercisable for any reason
without having been exercised in full, the unpurchased Shares which were subject
thereto shall, unless the Plan shall have been terminated, become available for
future grant under the Plan.

     4.   ADMINISTRATION OF AND GRANTS OF OPTIONS UNDER THE PLAN.

          (a)  PROCEDURE FOR GRANTS.  The provisions set forth in this
Section 4(a) shall not be amended more than once every six months, other than to
comport with changes in the Code, the Employee Retirement Income Security Act of
1974, as amended, or the rules thereunder.  All grants of Options to Outside
Directors under this Plan shall be automatic and non-discretionary and shall be
made strictly in accordance with the following provisions:

               (i)    No person shall have any discretion to select which
Outside Directors shall be granted Options or to determine the number of Shares
to be covered by Options granted to Outside Directors.

               (ii)   Each Outside Director shall be automatically granted an
Option to purchase 20,000 Shares (the "FIRST OPTION") on the date on which the
later of the following events occurs: (A) the effective date of this Plan, as
determined in accordance with Section 6 hereof or (B) the date of the first
meeting in which such person first participates in as a Director, whether
elected by the stockholders of the Company or appointed by the Board to fill a
vacancy.

               (iii)  Beginning on the four-year anniversary of the grant date
of a First Option to an Outside Director, such Outside Director shall thereafter
be automatically granted an Option to purchase 3,500 Shares (a "SUBSEQUENT
OPTION") on each anniversary of the grant date of such First Option.

               (iv)   Notwithstanding the provisions of subsections (ii) and
(iii) hereof any exercise of an Option made before the Company has obtained
stockholder approval of the Plan in accordance with Section 16 hereof shall be
conditioned upon obtaining such stockholder approval of the Plan in accordance
with Section 16 hereof.

               (v)    The terms of a First Option granted hereunder shall be as
follows:

                      (A) the term of the First Option shall be ten (10) years.


                                          2
<PAGE>

                      (B) the First Option shall be exercisable only while the
Outside Director remains a Director of the Company, except as set forth in
Section 8 hereof.

                      (C) the exercise price per Share shall be 100% of the fair
market value per Share on the date of grant of the First Option.

                      (D) the First Option shall become exercisable in monthly
installments cumulatively as to 1/48th of the Shares subject to the First Option
at the end of each one-month period following the grant date of such option.

               (vi)   The terms of a Subsequent Option granted hereunder shall
be as follows:

                      (A) the term of the Subsequent Option shall be ten (10)
years.

                      (B) the Subsequent Option shall be exercisable only while
the Outside Director remains a Director of the Company, except as set forth in
Section 8 hereof.

                      (C) the exercise price per Share shall be 100% of the fair
market value per Share on the date of grant of the Subsequent Option.

                      (D) the Subsequent Option shall become exercisable in
monthly installments cumulatively as to 1/12th of the Shares subject to the
Subsequent Option at the end of each one-month period following the grant date
of such option.

               (vii)  In the event that any Option granted under the Plan would
cause the number of Shares subject to outstanding Options plus the number of
Shares previously purchased under Options to exceed the Pool, then the remaining
Shares available for Option grant shall be granted under Options to the Outside
Directors on a pro rata basis.  No further grants shall be made until such time,
if any, as additional Shares become available for grant under the Plan through
action of the stockholders to increase the number of Shares which may be issued
under the Plan or through cancellation or expiration of Options previously
granted hereunder.

     5.   ELIGIBILITY.  Options may be granted only to Outside Directors.  All
Options shall be automatically granted in accordance with the terms set forth in
Section 4 hereof.  An Outside Director who has been granted an Option may, if he
is otherwise eligible, be granted an additional Option or Options in accordance
with such provisions.

          The Plan shall not confer upon any Optionee any right with respect to
continuation of service as a Director or nomination to serve as a Director, nor
shall it interfere in any way with any rights which the Director or, the Company
may have to terminate his or her directorship at any time.

     6.   TERM OF PLAN.  The Plan shall become effective upon the earlier to
occur of its adoption by the Board or its approval by the stockholders of the
Company as described in Section 16 of the Plan.  It shall continue in effect for
a term often (10) years unless sooner terminated under Section 11 of the Plan.

     7.   FORM OF CONSIDERATION.  The consideration to be paid for the Shares to
be issued upon exercise of an Option, including the method of payment, shall
consist of (i) cash, (ii) check, (iii) 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 (6) 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, (iv) delivery of a properly
executed exercise notice together with such other documentation as the Company
and the broker, if applicable, shall require to effect an exercise of the Option
and delivery to the Company of the sale or loan proceeds required to pay the
exercise price, or (v) any combination of the foregoing methods of payment.


                                          3
<PAGE>

     8.   EXERCISE OF OPTION.

          (a)  PROCEDURE FOR EXERCISE: RIGHTS AS A STOCKHOLDER.  Any Option
granted hereunder shall be exercisable at such times as are set forth in
Section 4 hereof; provided, however, that no Options shall be exercisable until
stockholder approval of the Plan in accordance with Section 16 hereof has been
obtained.

          An Option may not be exercised for a fraction of a Share.

          An Option shall be deemed to be exercised when written notice of such
exercise has been given to the Company in accordance with the terms of the
Option by the person entitled to exercise the Option and full payment for the
Shares with respect to which the Option is exercised has been received by the
Company.  Full payment may consist of any consideration and method of payment
allowable under Section 7 of the Plan.  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 stock certificate evidencing such Shares, no right
to vote or receive dividends or any other rights as a stockholder shall exist
with respect to the Optioned Stock, notwithstanding the exercise of the Option.
A share certificate for the number of 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 the stock certificate is issued, except as provided in Section 10 of
the Plan.

          Exercise of an Option in any manner shall result in a decrease in the
number of Shares which thereafter may be 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)  RULE 16b-3.  Options granted to Outside Directors must comply
with the applicable provisions of Rule 16b-3 promulgated under the Exchange Act
or any successor thereto and shall contain such additional conditions or
restrictions as may be required thereunder to qualify for the maximum exemption
from Section 16 of the Exchange Act with respect to Plan transactions.

          (c)  TERMINATION OF CONTINUOUS STATUS AS A DIRECTOR.  In the event an
Optionee's Continuous Status as a Director terminates (other than upon the
Optionee's death or total and permanent disability (as defined in
Section 22(e)(3) of the Code)), the Optionee may exercise his or her Option, but
only within three (3) months from the date of such termination, and only to the
extent that the Optionee was entitled to exercise it at the date of such
termination (but in no event later than the expiration of its ten (10) year
term).  To the extent that the Optionee was not entitled to exercise an Option
at the date of such termination, and to the extent that the Optionee does not
exercise such Option (to the extent otherwise so entitled) within the time
specified herein, the Option shall terminate.

          (d)  DISABILITY OF OPTIONEE.  In the event Optionee's Continuous
Status as a Director terminates as a result of total and permanent disability
(as defined in Section 22(e)(3) of the Code), the Optionee may exercise his or
her Option, but only within twelve (12) months from the date of such
termination, and only to the extent that the Optionee was entitled to exercise
it at the date of such termination (but in no event later than the expiration of
its ten (10) year term).  To the extent that the Optionee was not entitled to
exercise an Option at the date of termination, or if he or she does not exercise
such Option (to the extent otherwise so entitled) within the time specified
herein, the Option shall terminate.

          (e)  DEATH OF OPTIONEE.  In the event of an Optionee's death, the
Optionee' s estate or a person who acquired the right to exercise the Option by
bequest or inheritance may exercise the Option, but only within twelve (12)
months following the date of death, and only to the extent that the Optionee was
entitled to exercise it at the date of death (but in no event later than the
expiration of its ten (10) year term).  To the extent that the Optionee was not
entitled to exercise an Option at the date of death, and to the extent that the
Optionee's estate or a person who acquired the right to exercise such Option
does not exercise such Option (to the extent otherwise so entitled) within the
time specified herein, the Option shall terminate.


                                          4
<PAGE>

     9.   NON-TRANSFERABILITY OF OPTIONS.  The 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.

     10.  ADJUSTMENTS UPON CHANGES IN CAPITALIZATION DISSOLUTION MERGER,
ASSET SALE OR CHANGE OF CONTROL.

          (a)  CHANGES IN CAPITALIZATION.  Subject to any required action by the
stockholders of the Company, the number of Shares covered by each outstanding
Option and the number of Shares 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 covered by each such outstanding Option, shall be
proportionately adjusted for any increase or decrease in the number of issued
Shares 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 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." 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
subject to an Option.

          (b)  DISSOLUTION OR LIQUIDATION.  In the event of the proposed
dissolution or liquidation of the Company, to the extent that an Option has not
been previously exercised, it 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
shall be substituted by the successor corporation or a Parent or Subsidiary of
the successor corporation.  In the event that the successor corporation does not
agree to assume the Option or to substitute an equivalent option, each
outstanding Option shall become fully vested and exercisable, including as to
Shares as to which it would not otherwise be exercisable, unless the Board, in
its discretion, determines otherwise.  If an Option becomes fully vested and
exercisable in the event of a merger or sale of assets, the Board shall notify
the Optionee that the Option shall be fully exercisable for a period of thirty
(30) days from the date of such notice, and the Option will 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, 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).

     11.  AMENDMENT AND TERMINATION OF THE PLAN.

          (a)  AMENDMENT AND TERMINATION.  Except as set forth in Section 4, the
Board may at any time amend, alter, suspend, or discontinue the Plan, but no
amendment, alteration, suspension, or discontinuation shall be made which would
impair the rights of any Optionee under any grant theretofore made, without his
or her consent.  In addition, to the extent necessary and desirable to comply
with Rule 16b-3 under the Exchange Act (or any other applicable law or
regulation), the Company shall obtain stockholder approval of any Plan amendment
in such a manner and to such a degree as required.

          (b)  EFFECT OF AMENDMENT OR TERMINATION.  Any such amendment or
termination of the Plan shall not affect Options already granted and such
Options shall remain in full force and effect as if this Plan had not been
amended or terminated.

     12.  TIME OF GRANTING OPTIONS.  The date of grant of an Option shall, for
all purposes, be the date determined in accordance with Section 4 hereof.
Notice of the determination shall be given to each Outside Director to whom an
Option is so granted within a reasonable time after the date of such grant.


                                          5
<PAGE>

     13.  CONDITIONS UPON ISSUANCE OF SHARES.  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 pursuant thereto shall comply with all
relevant provisions of law, including, without limitation, the Securities Act of
1933, as amended, the Exchange Act, the rules and regulations promulgated
thereunder, state securities laws, and the requirements of any stock exchange
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 relevant provisions of law.

          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.

     14.  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.

     15.  OPTION AGREEMENT.  Options shall be evidenced by written option
agreements in such form as the Board shall approve.

     16.  STOCKHOLDER APPROVAL.  Continuance of the Plan shall be subject to
approval by the stockholders of the Company at or prior to the first annual
meeting of stockholders held subsequent to the granting of an Option hereunder.
Such stockholder approval shall be obtained in the degree and manner required
under applicable state and federal law.


                                          6

<PAGE>

                                                                 EXHIBIT 99.8

                                   SPEEDSIM, INC.

                 1995 INCENTIVE AND NONQUALIFIED STOCK OPTION PLAN

     SECTION 1.     PURPOSE

     This 1995 Incentive and Nonqualified Stock Option Plan (the "Plan") of
SpeedSim, Inc., a Delaware corporation (the "Company"), is designed to provide
additional incentive to executives, key employees and consultants of the
Company, its parent and subsidiaries by affording them an opportunity to acquire
or increase their proprietary interest in the Company through the acquisition of
shares of its Common Stock.  The Company intends that, unless the Board of
Directors shall otherwise determine, options issued to employees under the Plan
will qualify as incentive stock options ("Incentive Stock Options") as defined
in Section 422A of the Internal Revenue Code of 1986, as amended (the "Code"),
and the terms of the Plan shall be interpreted in accordance with this
intention.  Nonqualified stock options ("Nonqualified Stock Options") may also
be granted under the Plan.  The terms "parent" and "subsidiary" shall have the
respective meanings set forth in Section 425 of the Code.

     SECTION 2.     ADMINISTRATION

     2.1.  AUTHORITY.  The Plan shall be administered by the Board of Directors
of the Company (the "Board").  The Board may, to the full extent permitted by
law, delegate any or all of its powers under the Plan, other than its power to
modify, revise or terminate the Plan under Section 13 hereof, to a committee of
not fewer than three Directors (the "Committee") appointed by the Board.  Action
by the Board or the Committee, as the case may be, shall require the affirmative
vote of a majority of all members thereof.

     2.2.  POWERS.  Subject to the terms and conditions of the Plan, the Board
shall have the power:

           (a) To determine from time to time the persons eligible to receive
options and the options to be granted to such persons under the Plan and to
prescribe the terms, conditions, restrictions, if any, and provisions (which
need not be identical) of each option granted under the Plan to such persons;

           (b) To construe and interpret the Plan and options granted thereunder
and to establish, amend, and revoke rules and regulations for administration of
the Plan.  In this connection, the Board may correct any defect, supply any
omission, or reconcile any inconsistency in the Plan or in any option agreement
in the manner and to the extent it shall deem necessary or expedient to make the
Plan fully effective.  All decisions and determinations by the Board in the
exercise of this power shall be final and binding upon the Company and
optionees; and

           (c) Generally, to exercise such powers and to perform such acts as
the Board shall deem necessary or expedient to promote the best interests of the
Company with respect to the Plan.

           To the extent that any section of the Plan refers to the exercise by
the Board of any of the powers set forth above in this section, reference in
that section to the Board shall also constitute a reference to the Committee.

     SECTION 3.     STOCK

     3.1.  COMMON STOCK.  The stock subject to the options granted under the
Plan shall be shares of the Company's authorized but unissued common stock, or
shares of the Company's common stock held in treasury, $.001 par value (the
"Common Stock").  The total number of shares that may be issued pursuant to
options granted under the Plan shall not exceed an aggregate of 980,000 shares
of Common Stock; provided, however, that the class and


                                          1
<PAGE>

aggregate number of shares that may be subject to options granted under the Plan
shall be subject to adjustment as provided in Section 10 hereof.

     3.2.  TERMINATED OPTIONS.  Whenever any outstanding option under the Plan
expires, is cancelled or is otherwise terminated (other than by exercise), the
shares of Common Stock allocable to the unexercised portion of such option may
again be the subject of options under the Plan.

     SECTION 4.     ELIGIBILITY

     4.1.  ELIGIBLE EMPLOYEES.  Incentive Stock Options under the Plan may be
granted only to executives and other key employees of the Company or its parent
or subsidiaries.  Nonqualified Options may be granted to officers or other
employees of the Company or its parent or subsidiaries, to Directors of the
Company or its parent or subsidiaries, and to other individuals providing
services to the Company or its parent or subsidiaries.

     4.2.  LIMITATION ON OPTIONS TO 10% HOLDERS.  No Incentive Stock Option
shall be granted to an individual who, at the time the option is granted, owns
(including ownership attributed pursuant to Section 425 of the Code) more than
ten percent (10%) of the total combined voting power of all classes of stock of
the Company or any parent or subsidiary (a "greater-than-ten-percent
stockholder"), unless such option provides that (i) the purchase price per share
shall not be less than one hundred ten percent (110%) of the fair market value
of the Common Stock at the time such option is granted, and (ii) such option
shall not be exercisable to any extent after the expiration of five (5) years
from the date it is granted.

     4.3.  DOLLAR LIMITATION.  The aggregate fair market value (determined at
the time the option is granted) of the Common Stock with respect to which
Incentive Stock Options are exercisable for the first time by any optionee
during any calendar year (under the Plan and any other plans of the Company or
any parent or subsidiary for the issuance of incentive stock options) shall not
exceed $100,000.

     SECTION 5.     PRICE AND BASIC TERMS OF OPTIONS

     5.1.  EXPIRATION.  Notwithstanding any other provision of the Plan or of
any option agreement, but subject in each case to Section 5.4 of this Plan, each
option shall expire on the date specified in the relevant option agreement or
grant, which date shall not be later than the tenth anniversary (fifth
anniversary in the case of an Incentive Stock Option granted to a greater-than-
ten-percent stockholder) of the date on which the option was granted.

     5.2.  EXERCISE.  Each option may be exercised, so long as it is valid and
outstanding from time to time, in part or as a whole, subject to any limitations
with respect to the number of shares for which the option may be exercised at a
particular time and to such other conditions as the Board in its discretion may
specify upon granting the option.

     5.3.  PURCHASE PRICE.  The purchase price per share under each option shall
be determined by the Board and, in the case of Incentive Stock Options, shall
not be less than the fair market value of the Common Stock on the date the
option is granted (110% of the fair market value in the case of a greater-than-
ten-percent stockholder), such fair market value to be determined by the Board.

     5.4.  TERMINATION OF EMPLOYMENT OR DEATH OF OPTIONEE.

           (a) Except as may be otherwise expressly provided herein, options
shall terminate on the earlier of

               (i)   the date of expiration thereof,

               (ii)  one (1) day after termination of the employment
relationship or consulting relationship between the Company and the optionee for
cause as determined by the Company,


                                          2
<PAGE>

               (iii) thirty (30) days after termination of the employment or
consulting relationship between the Company and the optionee by the Company
without cause, or

               (iv)  one (1) day after termination of the employment
relationship or consulting relationship between the Company and the optionee at
the volition of the employee, other than by reason of death, permanent
disability or retirement in good standing from the employ of the Company for
reasons of age or disability under the then established rules of the Company.

               An employment relationship or consulting relationship, as the
case may be, between the Company and the optionee shall be deemed to exist
during any period in which the optionee is employed by or providing services to,
as the case may be, the Company or its parent or any subsidiary. Whether a
particular authorized leave of absence or absence on military or government
service shall constitute termination of the employment or consulting
relationship between the Company and the optionee shall be determined by the
Board at the time thereof. As used herein, "cause" shall be determined by the
Company.

           (b) In the event of the death or permanent disability of an optionee
while in the employ of the Company (as an employee or consultant) and before the
date of expiration of such optionee's options, such option shall terminate on
the earlier of such date of expiration or 180 days following the date of such
death or permanent disability.  After the death or permanent disability of the
optionee, the optionee's executors, administrators or any person or persons to
whom the optionee's option may be transferred by will or by the laws of descent
and distribution, shall have the right, at any time prior to such termination,
to exercise the option to the extent the optionee was entitled to exercise such
option immediately prior to the optionee's death or permanent disability.

           (c) If, before the date of expiration of the option, the optionee
shall be retired in good standing from the employ of the Company for reasons of
age or disability under the then established rules of the Company, the option
shall terminate on the earlier of such date of expiration or 30 days after the
date of such retirement.  In the event of such retirement, the optionee shall
have the right prior to the termination of such option to exercise the option to
the extent to which the optionee was entitled to exercise such option
immediately prior to such retirement.

           (d) If an optionee holding an Incentive Stock Option ceases to be an
employee and thereafter immediately becomes a consultant to the Company upon
ceasing to be an employee, such Incentive Stock Option may, at the election of
the Company, convert to a nonqualified stock option.

     5.5.  TRANSFERABILITY OF OPTIONS.  Options and the rights and privileges
conferred thereby shall not be assigned, pledged, hypothecated or otherwise
transferred in any manner other than by will or under the laws of descent and
distribution, and shall not be subject to execution, attachment or similar
process.  Options shall be exercisable, during the optionee's lifetime, only by
the optionee.

     5.6        RIGHTS OF OPTIONEES.  No optionee shall be deemed for any
purpose to be the owner of any shares of Common Stock subject to any option
unless and until the option shall have been exercised pursuant to the terms
thereof and the Company shall have issued and delivered certificates
representing the shares to the optionee.

     SECTION 6.      OPTION AGREEMENTS; AMENDMENTS.

           Each option granted hereunder shall be embodied in a written option
agreement which shall be subject to the terms and conditions of the Plan and
shall contain such terms, conditions, restrictions, if any, and provisions as
the Board shall deem advisable at the time of grant; PROVIDED THAT such
additional provisions, or such amendments as may be agreed to by the Company and
the Optionee, shall not be inconsistent with any other term or condition of the
Plan and such additional or amended provisions shall not cause any Incentive
Stock Option granted under the Plan to fail to qualify as an incentive option
within the meaning of Section 422A of the Code.  Option agreements need not be
identical, but each option agreement by appropriate language shall include the
substance of all of the provisions of Section 5 of the Plan.  Each option
agreement shall be signed by the President or


                                          3
<PAGE>

the Treasurer or, if authorized by the Board, by any Vice President of the
Company for and in the name and on behalf of the Company.

     SECTION 7.      REPURCHASE RIGHTS AND RIGHTS OF FIRST REFUSAL.

     The Board may in its discretion provide upon the grant of any option
hereunder that the Company shall have an option to repurchase, upon such terms
and conditions as are determined by the Board, all or any number of shares
purchased upon exercise of such option.  The repurchase price per share payable
by the Company shall be such amount or be determined by such formula as is fixed
by the Board at the time the option for the shares subject to repurchase is
granted.  The Board may also provide that the Company shall have the right of
first refusal with respect to the transfer or proposed transfer after exercise
of shares purchased under an option granted hereunder.  In the event the Board
shall grant options subject to the Company's repurchase option or rights of
first refusal, the certificates representing the shares purchased pursuant to
such option shall carry a legend satisfactory to counsel for the Company
referring to the Company's repurchase option or right of first refusal.

     SECTION 8.      "LOCKUP" AGREEMENT.

     The Board of Directors may in its discretion specify upon granting an
option that as a condition to exercise of the option, the optionee shall agree
in writing that for a period of time (not to exceed 180 days) from the effective
date of any registration of securities of the Company (upon request of the
Company or the underwriters managing any underwritten offering of the Company's
securities), the optionee will not sell, make any short sale of, loan, grant any
option for the purchase of, or otherwise dispose of any shares issued pursuant
to the exercise of such option, without the prior written consent of the Company
or such underwriters, as the case may be.

     SECTION 9.      METHOD OF EXERCISE; PAYMENT OF PURCHASE PRICE.

     9.1.  NOTICE OF EXERCISE.     Any option granted under the Plan may be
exercised by the optionee by delivering to the Company on any business day a
written notice specifying the number of shares of Common Stock the optionee then
desires to purchase and specifying the address to which the certificates for
such shares are to be mailed (the "Notice"), accompanied by payment for such
shares and any documents required under Section 11 or any other provision of the
Plan.

     9.2.  DELIVERY OF PAYMENT.  Payment for the shares of Common Stock
purchased pursuant to the exercise of an option shall be made either by (i)
cash, certified check, bank draft or postal or express money order equal to the
option price for the number of shares specified in the Notice, or (ii) with the
consent of the Board, shares of Common Stock of the Company having a fair market
value equal to the option price of such shares, or (iii) with the consent of the
Board, a combination of (i) and (ii).  For the purpose of the preceding
sentence, the fair market value per share of Common Stock so delivered to the
Company shall be determined by the Board.  As promptly as practicable after
receipt of the Notice, the accompanying payment and any documents required by
Section 11 hereof or any other provision of the Plan, the Company shall deliver
to the optionee certificates for the number of shares with respect to which such
option has been so exercised, issued in the optionee's name; provided, however,
that such delivery shall be deemed effected for all purposes when the Company or
a stock transfer agent of the Company shall have deposited such certificates in
the United States mail, addressed to the optionee, at the address specified in
the Notice.

     SECTION 10.     CHANGES IN COMPANY'S CAPITAL STRUCTURE.

     10.1. RIGHTS OF COMPANY. The existence of outstanding options shall not
affect in any way the right or power of the Company or its stockholders to make
or authorize, without limitation, any or all adjustments, recapitalizations,
reorganizations or other changes in the Company's capital structure or its
business, or any merger or consolidation of the Company, or any issue of Common
Stock, or any issue of bonds, debentures, preferred or prior preference stock or
other capital stock ahead of or affecting the Common Stock or the rights
thereof, or the dissolution or liquidation of the Company, or any sale or
transfer of all or any part of its assets or business, or any other corporate
act or proceeding, whether of a similar character or otherwise.


                                          4
<PAGE>

     10.2. RECAPITALIZATION, STOCK SPLITS AND DIVIDENDS.    If the Company shall
effect a subdivision or consolidation of shares or other capital readjustment,
the payment of a stock dividend, or other increase or reduction of the number of
shares of the Common Stock outstanding, in any such case without receiving
compensation therefor in money, services or property, then (i) the number,
class, and price per share of shares of stock subject to outstanding options
hereunder shall be appropriately adjusted in such a manner as to entitle an
optionee to receive upon exercise of an option, for the same aggregate cash
consideration, the same total number and class of shares as the optionee would
have received as a result of the event requiring the adjustment had the optionee
exercised such option in full immediately prior to such event; and (ii) the
number and class of shares with respect to which options may be granted under
the Plan shall be adjusted by substituting for the total number of shares of
Common Stock then reserved for issuance under the Plan that number and class of
shares of stock that the owner of an equal number of outstanding shares of
Common Stock would own as the result of the event requiring the adjustment.

     10.3. MERGER WITHOUT CHANGE OF CONTROL.  After a merger or consolidation of
the Company and one or more corporations in which the stockholders of the
Company immediately prior to such merger or consolidation own after such merger
or consolidation shares representing at least fifty percent (50%) of the voting
power of the Company or the surviving or resulting corporation, as the case may
be, each holder of an outstanding option shall, at no additional cost, be
entitled upon exercise of such option to receive, in lieu of shares of Common
Stock, the shares of stock or other securities or property (including, without
limitation, shares of stock or other securities of another corporation) to which
such holder would have been entitled pursuant to the terms of the merger or
consolidation if, immediately prior to such merger or consolidation, such holder
had been the holder of record of a number of shares of Common Stock equal to the
number of shares for which such holder wishes to exercise the option.

     10.4. SALE OR MERGER WITH CHANGE OF CONTROL.  If the Company is merged or
consolidated with another corporation under circumstances in which the
stockholders of the Company immediately prior to such merger or consolidation do
not own after such merger or consolidation shares representing at least fifty
percent (50%) of the voting power of the Company or the surviving or resulting
corporation, as the case may be, or if the Company is liquidated, or sells or
otherwise disposes of substantially all of its assets, in any such case while
unexercised options remain outstanding under the Plan, (i) subject to the
provisions of clauses (ii) and (iii) below, after the effective date of such
merger, consolidation, liquidation, sale or disposition, as the case may be,
each holder of an outstanding option shall be entitled, upon exercise of such
option, to receive, in lieu of shares of Common Stock, the shares of stock or
other securities, cash or property (including, without limitation, shares of
stock or other securities of another corporation) to which such holder would
have been entitled pursuant to the terms of the merger, consolidation,
liquidation, sale or disposition if, immediately prior to such event, such
holder had been the holder of record of a number of shares of Common Stock equal
to the number for which such holder wishes to exercise the option; (ii) the
Board may accelerate the time for exercise of all unexercised and unexpired
options to a date prior to the effective date of such merger, consolidation,
liquidation, sale or disposition, as the case may be, specified by the Board; or
(iii) all outstanding options may be cancelled by the Board as of the effective
date of such merger, consolidation, liquidation, sale or disposition provided
that (x) notice of such cancellation shall be given to each holder of an option
and (y) each holder of an option shall have the right to exercise such option to
the extent that the same is then exercisable or, if the Board shall have
accelerated the time for exercise of all unexercised and unexpired options, in
full during the 30-day period preceding the effective date of such merger,
consolidation, liquidation, sale or disposition.

     10.5. ADJUSTMENTS TO COMMON STOCK SUBJECT TO OPTIONS.  Except as
hereinbefore expressly provided, the issuance by the Company of shares of stock
of any class, or securities convertible into shares of stock of any class, for
cash or property, or for labor or services, either upon direct sale or upon the
exercise of rights or warrants to subscribe therefor, or upon conversion of
shares or obligations of the Company convertible into such shares or other
securities shall not affect, and no adjustment by reason thereof shall be made
with respect to, the number or price of shares of Common Stock then subject to
outstanding options.

     10.6. MISCELLANEOUS.  Adjustments under this Section 10 shall be determined
by the Board and such determinations shall be conclusive.  No fractional shares
of Common Stock shall be issued under the Plan on account of any adjustment
specified above.


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<PAGE>

     SECTION 11.     GENERAL RESTRICTIONS.

     11.1. INVESTMENT REPRESENTATIONS.  The Company may require any person to
whom an option is granted, as a condition of exercising such option, to give
written assurances in substance and form satisfactory to the Company to the
effect that such person is acquiring the Common Stock subject to the option for
the person's own account for investment and not for, with a view to or in
connection with any resale or distribution thereof, and to such other effects as
the Company deems necessary or appropriate in order to comply with federal and
applicable state securities laws.

     11.2. COMPLIANCE WITH SECURITIES LAWS.  The Company shall not be required
to sell or issue any shares under any option if the issuance of such shares
shall constitute a violation by the optionee or by the Company of any provision
of any law or regulation of any governmental authority.  In addition, in
connection with the Securities Act of 1933, as now in effect or hereafter
amended (the "Act"), upon exercise of any option, the Company shall not be
required to issue such shares unless the Board has received evidence
satisfactory to it to the effect that the holder of such option will not
transfer such shares except pursuant to a registration statement in effect under
the Act or unless an opinion of counsel satisfactory to the Company has been
received by the Company to the effect that such registration is not required.
Any determination in this connection by the Board or the Committee, as the case
may be, shall be final, binding and conclusive.  In the event the shares
issuable on exercise of an option are not registered under the Act, the Company
may imprint upon any certificate representing shares so issued the following
legend or any other legend which counsel for the Company considers necessary or
advisable to comply with the Act and with applicable state securities laws:

           The shares of stock represented by this certificate have not been
registered under the Securities Act of 1933 or under the securities laws of any
State and may not be pledged, hypothecated, sold or otherwise transferred unless
the registration requirements of such Act and all such laws have been complied
with or unless the Corporation has received an opinion of counsel satisfactory
to the Corporation, in form and substance satisfactory to the Corporation, that
such registration is not required for such transfer.

           The Company may, but shall in no event be obligated to, register any
securities covered by the Plan pursuant to the Act; and in the event any shares
are so registered the Company may remove any legend on certificates representing
such shares.  The Company shall not be obligated to take any affirmative action
in order to cause the exercise of an option or the issuance of shares pursuant
thereto to comply with any law or regulation of any governmental authority.

     SECTION 12.     NO EMPLOYMENT OBLIGATION.

     The granting of any option shall not impose upon the Company any obligation
to employ or continue to employ any optionee as an employee or consultant; and
the right of the Company to terminate the employment of any officer or other
employee or consultant shall not be diminished or affected by reason of the fact
that an option has been granted to such officer, employee or consultant.

     SECTION 13.     AMENDMENT OR TERMINATION OF THE PLAN.

     The Board of Directors may modify, revise or terminate the Plan at any time
and from time to time, except that the class of employees eligible to receive
Incentive Stock Options and the aggregate number of shares issuable pursuant to
the Plan shall not be changed or increased, other than by operation of
Section 10 hereof, without the consent of the stockholders of the Company.
Except as provided in Section 10 hereof, rights and obligations under any option
granted before any amendment of the Plan shall not be altered or impaired by
such amendment without the consent of the optionee.

     SECTION 14.     NONEXCLUSIVITY OF THE PLAN.

     Neither the adoption of the Plan by the Board of Directors nor the
submission of the Plan to the stockholders of the Company for approval shall be
construed as creating any limitations on the power of the Board of


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<PAGE>

Directors to adopt such other incentive arrangements as it may deem desirable,
including, without limitation, the granting of stock options otherwise than
under the Plan, and such arrangements may be either applicable generally or only
in specific cases.

     SECTION 15.     EFFECTIVE DATE AND DURATION OF PLAN.

     The Plan shall become effective upon its adoption by the Board of
Directors.  The Plan shall terminate (i) when the total amount of Common Stock
with respect to which options may be granted shall have been issued upon the
exercise of options or (ii) by action of the Board of Directors pursuant to
Section 13 hereof, whichever shall first occur.

     SECTION 16.     GOVERNING LAW.

     The Plan and all options issued under it shall be governed by, and
construed and enforced in accordance with, the substantive laws of The
Commonwealth of Massachusetts.

                                  * * * * * * * *



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