WITNESSETH

                                                                   EXHIBIT 10.67

                   AMENDMENT TO EXECUTIVE SEPARATION, RELEASE
                            AND CONSULTING AGREEMENT

        This Amendment to Executive Separation, Release and Consulting Agreement
(this "Amendment") is made and entered into as of the 23rd day of August, 2002,
by and between Xxxxxx X. Xxxxxx (the "Executive") and Cadence Design Systems,
Inc. (the "Company").

                                   WITNESSETH

        WHEREAS, the Executive and the Company have entered into that certain
Executive Separation, Release and Consulting Agreement dated as of December 3,
2001 (the "Agreement"), which is incorporate herein by this reference; and

        WHEREAS, the Executive and the Company desire to amend the Agreement as
more particularly set forth herein.

        NOW, THEREFORE, for and in consideration of the premises, the mutual
covenants and agreements herein set forth, and for other good and valuable
consideration, the receipt, adequacy and sufficiency of which are hereby
expressly acknowledged by the parties hereto, the parties hereto do hereby
covenant and agree as follows:

        1.     Consulting. Section 3a of the Agreement is hereby amended and
restated in its entirety as follows:

               (X) $376,000.00, less taxes and standard withholdings required by
               law to be withheld, and deductions requested by Executive, to be
               paid out in twelve equal payments on the fifteenth of each month,
               beginning December 15, 2001; (Y) a bonus in the amount of
               $403,146.23, less taxes and withholdings required by law to be
               withheld, and amounts requested by him to be deducted, including
               (i) $ 21,855.00, representing the depreciated cost of the Halcon
               Agenda Race Track Desk, Halcon Elliptical Conference Table and
               (5) Xxxxxxxxxx leather chairs (which are currently located in
               Executive's former office at the Company's Chelmsford,
               Massachusetts campus and which the Company agrees to move, at the
               Company's cost, to Executive's property located at 0 Xxxxxxxxxxx
               Xxxx, Xxxxx, Xxxxxxxxxxxxx); and (ii) $ 53,146.23, representing
               the remaining principal and accrued interest (as of February 15,
               2002) due under the promissory note delivered by the Executive to
               the Company dated as of July 15, 2000, on or about February 15,
               2002, so long as Executive continues in his part-time employment
               capacity with the Company through that date and has not in any
               way breached this Agreement; and (Z) a bonus in the amount of
               $569,813.45 for consulting services performed during the period
               from

               December 3, 2001 through August 16, 2002, less taxes and standard
               withholdings required by law to be withheld, and deductions
               requested by Executive, to be paid on or about August 22, 2002;

        2.     Ratification. The Executive and the Company hereby ratify and
confirm the Agreement, as modified by this Amendment. In addition, the Executive
hereby releases the Company as of the date hereof in accordance with the
provisions of Section 8 of the Agreement with the same effect as if such Section
8 were restated herein in its entirety.

        IN WITNESS WHEREOF, the undersigned have caused this Amendment to be
executed and delivered as of the date first above written.

CADENCE DESIGN SYSTEMS, INC.


By: /s/ Xxxxxxx Xxxxxx
Name:    Xxxxxxx Xxxxxx
Title:  Sr. VP & CFO



/s/ Xxxxxx X. Xxxxxx
Xxxxxx X. Xxxxxx



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