EXHIBIT 10.50

                               SECURED PROMISSORY NOTE


                                                                      8/11, 1999

$417,817.95                                              Marlboro, Massachusetts

     FOR VALUE RECEIVED William Herman, who resides at 8 Cobblestone Place,
Sudbury, MA 01776 (the "Maker"), promises to pay to Viewlogic Systems, Inc.,
or order, at the offices of Viewlogic Systems, Inc. in Marlboro,
Massachusetts, or at such other place as the holder of this Note may
designate in writing, the principal sum of $417,817.95, without interest.
The entire unpaid principal amount of this Note shall be due and payable on
the earliest of the following dates:

     a.   The date which is the seventh anniversary of the date of this Note.
     b.   The date which is eighteen months after the first date, if any, on
          which the common stock of Viewlogic Systems, Inc. (or any security
          substituted therefor) is listed on a national securities exchange or
          the NASDAQ stock market.
     c.   Immediately upon the occurrence of an Event of Default hereunder or
          as defined in the Stock Pledge Agreement referenced below.
     d.   The date which is three months after the termination of the Maker's
          employment with the Company for any reason or no reason.
     e.   The date which is one month before the Final Exercise Date, as
          defined in the option agreement between the Maker and the Company
          under which the Maker acquired the collateral securing this Note.

All payments by the Maker under this Note shall be in immediately available
funds.

     Payment of this Note is secured by a security interest in certain shares of
common stock of Viewlogic Systems, Inc. owned by the Maker (the "Collateral")
pursuant to a stock pledge agreement of even date herewith between the Maker and
Viewlogic Systems, Inc. (the "Stock Pledge Agreement").

     Upon the occurrence of an Event of Default hereunder or as defined in the
Stock Pledge Agreement, the holder shall have then, or at any time thereafter,
all of the rights and remedies afforded by the Uniform Commercial Code as from
time to time in effect in the Commonwealth of Massachusetts or afforded by other
applicable law, subject to the limitations set forth is this Note or the Stock
Pledge Agreement relating to the liability of the Maker for payment of any
deficiency due hereunder or under the Stock Pledge Agreement.

     Notwithstanding anything to the contrary in this Note, the Stock Pledge
Agreement or


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otherwise, Viewlogic Systems, Inc. and each other holder of this Note
acknowledge and agree that the entire liability and obligation of the Maker
under, or in connection with, this Note is limited to the surrender of the
Collateral, plus, if the value of the Collateral at the time of any surrender
thereof is not sufficient to satisfy Maker's then outstanding liabilities and
obligations under this Note, the payment, in cash or by bank or certified
check, of an amount equal to the lesser of (a) one half of the original
principal amount of this Note and (b) the entire amount remaining unpaid
under this Note after applying the value of the Collateral.

     No reference in this Note to the Stock Pledge Agreement or any guaranty
shall impair the obligation of the Maker to pay all amounts due under this Note
strictly in accordance with the terms of this Note.

     No delay or omission on the part of the holder in exercising any right
under this Note or the Stock Pledge Agreement shall operate as a waiver of such
right or of any other right of such holder, nor shall any delay, omission or
waiver on any one occasion be deemed a bar to or waiver of the same or any other
right on any future occasion.  The Maker and every endorser or guarantor of this
Note regardless of the time, order or place of signing waives presentment,
demand, protest and notices of every kind (except as expressly set forth in this
Note or the Stock Pledge Agreement) and assents to any extension or postponement
of the time of payment or any other indulgence, to any substitution, exchange or
release of Collateral, and to the addition or release of any other party or
person primarily or secondarily liable.

     This Note may be prepaid in whole or in part at any time or from time to
time.  Any such prepayment shall be without premium or penalty.  Immediately
upon the payment or prepayment in whole of this Note, the Collateral shall be
released to Maker, free and clear of all liens, encumbrances and security
interests created or held by holder.

     None of the terms or provisions of this Note may be excluded, modified or
amended except by a written instrument duly executed on behalf of the Maker and
the holder, expressly referring to this Note and setting forth the provision so
excluded, modified or amended.

     All rights and obligations hereunder shall be governed by the laws of the
Commonwealth of Massachusetts, excluding its rules regarding conflict of laws,
and this Note is executed as an instrument under seal.


ATTEST:                                    MAKER


By:     /s/ Paula J. Cassidy               /s/ William Herman
   ----------------------------------      ----------------------------------
Title:    Paula J. Cassidy                 Print Name:  William Herman
      -------------------------------                 -----------------------
      Vice President of Human Resources


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