EXHIBIT 10.23

                                   AGREEMENT
                                   ---------

          This Agreement is entered into as of June 30, 1995 by and between
Parametric Technology Corporation (the "Company"), a Massachusetts corporation
with its principal place of business at 128 Technology Drive, Waltham,
Massachusetts, 02154, and Mark J. Gallagher (the "Employee"), residing at
4 Mayflower Road, Winchester, Massachusetts, 01890.
 
          WHEREAS, the Employee has resigned his positions as Senior Vice
President of Finance and Administration, Chief Financial Officer and Treasurer
of the Company, effective June 30, 1995; and

          WHEREAS, the Company desires to continue to employ the Employee in
order to facilitate the (i) the closing of the proposed merger of Rasna
Corporation into the Company (the "Merger"), and (ii) transition to Employee's
successor.

          NOW, THEREFORE, in consideration of the foregoing recitals, the mutual
promises and covenants contained herein, and other good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged, the
Company and the Employee hereby agree as follows:

                                   ARTICLE I
                                   EMPLOYMENT

          1.1  Employment.  The Company hereby agrees to continue to employ the
               -----------                                                     
Employee to perform such specific duties as may reasonably be requested of the
Employee from time to time by the Chief Executive Officer of the Company in
order to (i) facilitate the closing of the Merger, (ii) amend internal control
policies, and (iii) comply with statutory filing requirements, for the period
commencing on June 30, 1995 and terminating on the date financial results
covering at least thirty (30) days of post-Merger combined results are released
to the public, unless (i) extended by mutual written consent of the Company and
the Employee, or (ii) earlier terminated as provided herein. The Employee hereby
accepts such continued employment for the term hereof.

                                   ARTICLE II
                           COMPENSATION AND BENEFITS

          2.1  (a)  Salary.  The Employee shall continue to receive his current
                    -------                                                    
bi-weekly salary of Six Thousand Seven Hundred Thirty Dollars and Seventy-Seven
Cents ($6,730.77) throughout the term hereof.

               (b)  Bonus.  The Employee shall receive the executive incentive
                    ------
bonus payable to the Employee on a pro-rated basis through June 30, 1995 in an
amount equal to One Hundred Thirty Thousand Dollars ($130,000) pursuant to the
Company's 1995 Executive Incentive Plan provided that the Employee remains
employed by the Company throughout the term hereof.

               (c) Benefits.  The Employee shall continue to receive his current
                   ---------                                                    
medical, dental, life and other insurance benefits and remain eligible to
participate in the Company's 401(k) Savings Plan, 1991 Employee Stock Purchase
Plan and 1987 Incentive Stock Option Plan subject to the terms and conditions of
the respective plans.

                                  ARTICLE III
                                  TERMINATION

          3.1  For Cause.  The Employee may be terminated from his employment by
               ----------                                                       
the Company only for "Cause".  For purposes hereof, Cause is defined as (i)
willful conduct by the Employee which is demonstrably and materially injurious
to the Company, (ii) the Employee's violation of Section 5.1 hereof, (iii) the
Employee's commencement of employment with another company, entity or person,
other than as an independent consultant or as a member of the board of directors
subject to the conditions set forth in Section 5.1 hereof, or (iv) for the
Employee's violation of Section 6.1 hereof.

 
          3.2  Without Cause.  The Employee may terminate his employment by the
               --------------                                                  
Company without cause by providing to the Company fourteen days' prior written
notice of such termination.

          3.3  Death.  In the event of the death of the Employee during the term
               ------
hereof, the Employee's employment shall automatically terminate as of the date
of his death.

          3.4  Merger.  The Company may terminate Employee's employment by
               -------                                                    
providing to the Employee fourteen (14) days' prior written notice of such
termination in the event that the Company fails to consummate the Merger, but in
any event not prior to August 21, 1995.

                                   ARTICLE IV
                             EFFECT OF TERMINATION

          4.1  For Cause.  Upon termination of the Employee's employment for
               ----------                                                   
cause, the Employee's salary and benefits and right to receive the executive
incentive bonus specified in Section 2.1 shall cease at the time of such
termination, provided that the Company shall pay to the Employee, within fifteen
(15) days after the date of such termination, all amounts then accrued under
Section 2.1.  Each stock option under the Company's 1987 Incentive Stock Option
Plan (the "ISO Plan") that is held by the Employee on the date of termination of
the Employee's employment, to the extent exercisable at the date of such
termination, shall expire to the extent not previously exercised ten (10) days
after the date of such termination.

          4.2  Without Cause; Merger.  In the event that the Employee terminates
               ----------------------                                           
his employment with the Company without Cause or the Company terminates the
Employee's employment pursuant to Section 3.4 hereof, the Employee shall be
entitled to receive the salary and employee benefits then in effect for a period
of fourteen (14) days following notice of termination.  Each stock option under
the ISO Plan that is held by the Employee on the date of termination of the
Employee's employment, to the extent exercisable at the date of such
termination, shall expire to the extent not previously exercised ten (10) days
after the date of such termination.

          4.3  Death.  Upon termination of the Employee's employment due to his
               ------                                                          
death, the Employee's salary and benefits specified in Section 2.1 shall cease
at the time of such termination, provided that the Company shall pay to the
Employee's estate, within fifteen (15) days after the date of such termination,
all amounts then accrued under Section 2.1.  Each stock option under the ISO
Plan then held by the Employee, to the extent exercisable at the date of such
termination, may be exercised at any time within one year after that date
(unless terminated earlier by its terms) by the person(s) to whom the Employee's
option rights pass by will or by the applicable laws of descent and
distribution.

                                   ARTICLE V
                       COMPLIANCE WITH EXISTING AGREEMENT

          5.1  Compliance with Existing Agreement.  The Employee agrees to be
               -----------------------------------                           
bound by all of the terms and conditions contained in that certain agreement
dated January 18, 1988 by and between the Company and the Employee relating to
nondisclosure, noncompetition and nonsolicitation and inventions, a copy of
which is attached hereto and made a part hereof as if fully set forth herein
(the "Employee Agreement"); provided, however, that during the term of this
Agreement, the Employee shall be permitted to act as an independent consultant
to and/or serve as a member of the board of directors of a third party so long
as such activity or service does not, in the Company's sole opinion, conflict
with the Employee's on-going obligations to the Company.


                                   ARTICLE VI
                      COMPLIANCE WITH TRADING RESTRICTIONS

          6.1  The Employee agrees to refrain from buying or selling or
otherwise reducing his risk of ownership in the common stock of the Company
until after the public release of financial results covering at least thirty
(30) days of post-Merger combined results without the prior express written
approval of the Company.  Notwithstanding anything to the contrary contained
herein, Employee may exercise options granted under the Company's 1987 Incentive
Stock Option Plan provided that Employee does not sell, 


                                       2

 
transfer or otherwise dispose of the underlying stock acquired pursuant to any
such option exercise without the prior express written approval of the Company.
The Employee's obligations under this Section 6.1 shall survive and continue
after any early termination of this Agreement pursuant to Sections 3.1, 3.2
and/or 3.3 hereof.

                                  ARTICLE VII
                             SUCCESSORS AND ASSIGNS

          7.1  Assignment.  This Agreement is personal to the Employee and
               -----------                                                
without the prior written consent of the Company shall not be assignable by the
Employee otherwise than by will or the laws of descent and distribution.

          7.2  Binding Effect.  This Agreement shall inure to the benefit of and
               ---------------                                                  
be binding upon the Company and its successors and assigns.


                                  ARTICLE VIII
                                 MISCELLANEOUS
                                        
          8.1  Governing Law.  This Agreement shall be governed by and construed
               --------------                                                   
in accordance with the laws of The Commonwealth of Massachusetts, without
reference to principles of conflict of laws.

          8.2  Amendment.  This Agreement may not be amended or modified
               ----------                                               
otherwise than by a written agreement executed by the parties hereto or their
respective successors and legal representatives.

          8.3  Notices.  All notices hereunder shall be in writing and shall be
               --------                                                        
delivered by hand delivery, by a reputable overnight courier service, or by
registered or certified mail, return receipt requested, postage prepaid, to the
parties at their respective addresses set forth above or at such other address
as either party shall have furnished to the other in writing in accordance
herewith.  Any notice shall be deemed to be delivered upon the date of hand
delivery, one day following delivery to such overnight courier service, or three
days following mailing by registered or certified mail.

          8.4  Captions.  Captions herein have been inserted solely for
               ---------                                               
convenience of reference and in no way define, limit or describe the scope or
substance of any provision of this Agreement.

          8.5  Severability.  In case any provision hereof shall, for any
               -------------                                             
reason, be held to be invalid or unenforceable in any respect, such invalidity
or unenforceability shall not effect any other provision hereof, and this
Agreement shall be construed as if such invalid or unenforceable provision had
not been included.

          8.6  Entire Agreement.  This Agreement, together with the Employee
               -----------------                                            
Agreement, constitutes the entire understanding and agreement between the
parties hereto with regard to the subject matter hereof, and supersedes all
prior understandings and agreements, whether oral or written, including, without
limitation, that certain agreement dated as of August 19, 1994 by and between
the Company and the Employee, which agreement shall be void and of no force or
effect.

          EXECUTED as of the date first above written.

PARAMETRIC TECHNOLOGY CORPORATION                    THE EMPLOYEE



By: /s/ C. Richard Harrison                          /s/ Mark J. Gallagher
    -----------------------                          ------------------------
    C. Richard Harrison                              Mark J. Gallagher
    President and Chief Operating Officer


                                       3

 
In consideration of my employment by Parametric Technology Corporation
(hereinafter referred to as "EMPLOYER"), I hereby agree as follows:

1.    I understand that my employment relationship with EMPLOYER is one whereby
      I will be exposed to confidential information and data, trade secrets,
      both tangible and intangible, confidential customer information and
      customer-related materials, know-how and related materials, all of which
      are unique, owned by and valuable to EMPLOYER.

2.    I will not disclose at any time during my employment or thereafter
      directly or indirectly, to any third party or parties any information or
      knowledge which I may acquire with respect to inventions, designs,
      methods, systems, improvements, trade secrets or other private or
      confidential matters of EMPLOYER without prior written approval of
      EMPLOYER, provided, however, that none of the foregoing shall prevent me
      from using or disclosing information of knowledge which is then generally
      known to and available within the industry automation business.

3.    I agree that all data, including drawings, prints, specifications,
      designs, notes, records, documents, reproductions and other information
      either furnished by EMPLOYER to me or prepared by me in connection with my
      employment are the sole property of EMPLOYER and I will turn over same to
      EMPLOYER upon request and in any event upon my termination of employment
      with EMPLOYER.

4.    I agree that all inventions and improvements or discoveries made by or
      conceived by me alone or in conjunction with others during the term of my
      employment relating to products or services or EMPLOYER shall belong to
      EMPLOYER, and I will promptly communicate and disclose to EMPLOYER all
      such inventions, improvements or discoveries.

5.    I will execute all papers and documents as requested by EMPLOYER to apply
      for UNITED STATES and foreign patents and copyrights relating to any such
      inventions, improvements, or discoveries in my name or EMPLOYER'S name, as
      the case may be, and to vest title to such patents of copyrights in
      EMPLOYER, or its nominee, at EMPLOYER'S expense. I also agree, if
      requested by EMPLOYER, to give testimony in the event of contested
      proceedings involving patent application or patents maturing therefrom
      upon reasonable reimbursement for time so expended.

6.    I agree that the obligations imposed herein upon me shall survive the
      termination of my employment, and further agree that for a period of one
      (1) year after I leave the employment of EMPLOYER, I shall not either
      directly or indirectly:

      (i)    Make known to any person, firm or corporation the names and
             addresses of any of the customers of EMPLOYER or any other
             information pertaining to them.

     (ii)    Take away any of the customers of EMPLOYER on whom I called, or
             with whom I dealt or became acquainted during my employment with
             EMPLOYER, either for myself or for any other person, firm or
             corporation.

     (iii)   Accept a position with, or otherwise become affiliated with any
             other person, firm or corporation for the purpose of competing with
             EMPLOYER'S business. I understand that this provision not to work
             for any of EMPLOYER'S competitors is necessary to protect its trade
             secrets, proprietary information, confidential information, and
             know-how by my avoiding such employment situations which would
             inherently create a risk of fraud with the potentiality of
             intentional and unintentional revelations of the above-mentioned
             information belonging to the EMPLOYER.

     (iv)    Interfere with the business in any manner including recruiting or
             hiring of employee of EMPLOYER or ex-employee whose employment with

 
             EMPLOYER was terminated less than one (1) year prior to the date of
             such interference.

7.   It is understood that either party may terminate the employment
     relationship at any time upon not less than fourteen (14) days notice
     unless the termination is for cause, in which event only three (3) days
     notice shall be required.

8.   This Agreement shall be binding upon the parties, their heirs, executors,
     administrators, legal representatives, successors and assigns.

9.   It is agree that this Agreement shall have the effect of a sealed
     instrument and shall be governed and construed in accordance with the laws
     of the Commonwealth of Massachusetts.

10.  I recognize that any violation by me of the provisions of the Agreement
     would cause EMPLOYER irreparable damage for which other remedies would be
     inadequate, and I therefore agree that EMPLOYER shall have the right to
     obtain, in addition to all other remedies, such injunctive and other
     equitable relief from a court of competent jurisdiction as may be necessary
     or appropriate to prevent any violation of this Agreement.

1l.  All headings and subdivisions of this Agreement are for reference only and
     shall not affect its interpretation. In the event that any provision of
     this Agreement should be held unenforceable by a court of competent
     jurisdiction, all remaining provisions shall continue in full force without
     being impaired or invalidated in any way.

IN WITNESS WHEREOF, the parties have hereunto affixed their hands and seals this
18th day of January, 1988.
----       --------    -- 


                                        /s/ Mark J. Gallagher
                                        ----------------------------------
                                        Employee Signature


                                        Parametric Technology Corporation


                                        /s/ Steven C. Walske
                                        ----------------------------------
                                        By: