SIMULATION SCIENCES INC
SC 13G, 1997-02-14
COMPUTER PROGRAMMING SERVICES
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                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                  SCHEDULE 13G


                    Under the Securities Exchange Act of 1934
                         (Amendment No._____________ )*

                            Simulation Sciences, Inc.
- --------------------------------------------------------------------------------
                                (Name of Issuer)

                          Common Stock, $.001 par value
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                   0008292131
                         -------------------------------
                                 (CUSIP Number)


*The  remainder of this cover page shall be filled out for a reporting  person's
initial filing on this form with respect to the subject class of securities, and
for any  subsequent  amendment  containing  information  which  would  alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the  Securities  Exchange  Act of
1934 ("Act") or otherwise  subject to the liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).







- --------------------------------------------------------------------------------
CUSIP No.      0008292131             13G                 Page 2  of  33  Pages
               ----------
- --------------------------------------------------------------------------------


- ------ -------------------------------------------------------------------------
  1    NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                Summit Ventures III, L.P.

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                        (a) [ ]
                                                                        (b) [ ]

- ------ -------------------------------------------------------------------------
  3    SEC USE ONLY

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  4    CITIZENSHIP OR PLACE OF ORGANIZATION

                Delaware limited partnership

- ------ -------------------------------------------------------------------------
- ----------------------- ----- --------------------------------------------------
                         5    SOLE VOTING POWER

                                       0 shares
      NUMBER OF
                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
        SHARES           6    SHARED VOTING POWER
     BENEFICIALLY
       OWNED BY                        1,278,651 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         EACH            7    SOLE DISPOSITIVE POWER
      REPORTING
        PERSON                         0 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         WITH            8    SHARED DISPOSITIVE POWER

                                       1,278,651 shares

- ----------------------- ----- --------------------------------------------------
- ------ -------------------------------------------------------------------------
  9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                1,278,651 shares

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ]


- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                13.0%

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON *

                PN

- ------ -------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!



                               Page 2 of 33 Pages







- --------------------------------------------------------------------------------
CUSIP No.      0008292131             13G                 Page 3  of  33  Pages
               ----------
- --------------------------------------------------------------------------------

- ------ -------------------------------------------------------------------------
  1    NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                Summit Partners III, L.P.

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                        (a) [ ]
                                                                        (b) [ ]

- ------
- ------ -------------------------------------------------------------------------
  3    SEC USE ONLY

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  4    CITIZENSHIP OR PLACE OF ORGANIZATION

                Delaware limited partnership

- ------ -------------------------------------------------------------------------
- ----------------------- ----- --------------------------------------------------
                         5    SOLE VOTING POWER

                                       0 shares
      NUMBER OF
                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
        SHARES           6    SHARED VOTING POWER
     BENEFICIALLY
       OWNED BY                        1,278,651 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         EACH            7    SOLE DISPOSITIVE POWER
      REPORTING
        PERSON                         0 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         WITH            8    SHARED DISPOSITIVE POWER

                                       1,278,651 shares

- ----------------------- ----- --------------------------------------------------
- ------ -------------------------------------------------------------------------
  9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                1,278,651 shares

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ]


- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                13.0%

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON *

                PN

- ------ -------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                               Page 3 of 33 Pages






- --------------------------------------------------------------------------------
CUSIP No.      0008292131             13G                  Page 4  of  33  Pages
               ----------
- --------------------------------------------------------------------------------

- ------ -------------------------------------------------------------------------
  1    NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                Summit Investors II, L.P.

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                        (a) [ ]
                                                                        (b) [ ]

- ------
- ------ -------------------------------------------------------------------------
  3    SEC USE ONLY

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  4    CITIZENSHIP OR PLACE OF ORGANIZATION

                Delaware limited partnership

- ------ -------------------------------------------------------------------------
- ----------------------- ----- --------------------------------------------------
                         5    SOLE VOTING POWER

                                       0 shares
      NUMBER OF
                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
        SHARES           6    SHARED VOTING POWER
     BENEFICIALLY
       OWNED BY                        1,278,651 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         EACH            7    SOLE DISPOSITIVE POWER
      REPORTING
        PERSON                         0 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         WITH            8    SHARED DISPOSITIVE POWER

                                       1,278,651 shares

- ----------------------- ----- --------------------------------------------------
- ------ -------------------------------------------------------------------------
  9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                1,278,651 shares

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ]


- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                13.0%

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON *

                PN

- ------ -------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                               Page 4 of 33 Pages






- --------------------------------------------------------------------------------
CUSIP No.      0008292131             13G                 Page 5  of  33  Pages
               ----------
- --------------------------------------------------------------------------------

- ------ -------------------------------------------------------------------------
  1    NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                Stamps, Woodsum & Co. III

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                         (a) [ ]
                                                                         (b) [ ]

- ------
- ------ -------------------------------------------------------------------------
  3    SEC USE ONLY

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  4    CITIZENSHIP OR PLACE OF ORGANIZATION

                Massachusetts general partnership

- ------ -------------------------------------------------------------------------
- ----------------------- ----- --------------------------------------------------
                         5    SOLE VOTING POWER

                                       0 shares
      NUMBER OF
                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
        SHARES           6    SHARED VOTING POWER
     BENEFICIALLY
       OWNED BY                        1,278,651 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         EACH            7    SOLE DISPOSITIVE POWER
      REPORTING
        PERSON                         0 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         WITH            8    SHARED DISPOSITIVE POWER

                                       1,278,651 shares

- ----------------------- ----- --------------------------------------------------
- ------ -------------------------------------------------------------------------
  9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                1,278,651 shares

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ]


- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                13.0%

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON *

                PN

- ------ -------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                               Page 5 of 33 Pages








- --------------------------------------------------------------------------------
CUSIP No.      0008292131             13G                 Page 6  of  33  Pages
               ----------
- --------------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  1    NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                E. Roe Stamps, IV

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                         (a) [ ]
                                                                         (b) [ ]

- ------
- ------ -------------------------------------------------------------------------
  3    SEC USE ONLY

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  4    CITIZENSHIP OR PLACE OF ORGANIZATION

                United States

- ------ -------------------------------------------------------------------------
- ----------------------- ----- --------------------------------------------------
                         5    SOLE VOTING POWER

                                       0 shares
      NUMBER OF
                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
        SHARES           6    SHARED VOTING POWER
     BENEFICIALLY
       OWNED BY                        1,278,651 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         EACH            7    SOLE DISPOSITIVE POWER
      REPORTING
        PERSON                         0 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         WITH            8    SHARED DISPOSITIVE POWER

                                       1,278,651 shares

- ----------------------- ----- --------------------------------------------------
- ------ -------------------------------------------------------------------------
  9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                1,278,651 shares

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ]


- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                13.0%

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON *

                IN

- ------ -------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!



                               Page 6 of 33 Pages







- --------------------------------------------------------------------------------
CUSIP No.      0008292131             13G                 Page 7  of  33  Pages
               ----------
- --------------------------------------------------------------------------------

- ------ -------------------------------------------------------------------------
  1    NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                Stephen G. Woodsum

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                         (a) [ ]
                                                                         (b) [ ]

- ------
- ------ -------------------------------------------------------------------------
  3    SEC USE ONLY

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  4    CITIZENSHIP OR PLACE OF ORGANIZATION

                United States

- ------ -------------------------------------------------------------------------
- ----------------------- ----- --------------------------------------------------
                         5    SOLE VOTING POWER

                                       0 shares
      NUMBER OF
                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
        SHARES           6    SHARED VOTING POWER
     BENEFICIALLY
       OWNED BY                        1,278,651 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         EACH            7    SOLE DISPOSITIVE POWER
      REPORTING
        PERSON                         0 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         WITH            8    SHARED DISPOSITIVE POWER

                                       1,278,651 shares

- ----------------------- ----- --------------------------------------------------
- ------ -------------------------------------------------------------------------
  9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                1,278,651 shares

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ]


- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                13.0%

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON *

                IN

- ------ -------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                               Page 7 of 33 Pages







- --------------------------------------------------------------------------------
CUSIP No.      0008292131             13G                 Page 8  of  33  Pages
               ----------
- --------------------------------------------------------------------------------

- ------ -------------------------------------------------------------------------
  1    NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                Gregory M. Avis

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                         (a) [ ]
                                                                         (b) [ ]

- ------
- ------ -------------------------------------------------------------------------
  3    SEC USE ONLY

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  4    CITIZENSHIP OR PLACE OF ORGANIZATION

                United States

- ------ -------------------------------------------------------------------------
- ----------------------- ----- --------------------------------------------------
                         5    SOLE VOTING POWER

                                       0 shares
      NUMBER OF
                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
        SHARES           6    SHARED VOTING POWER
     BENEFICIALLY
       OWNED BY                        1,278,651 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         EACH            7    SOLE DISPOSITIVE POWER
      REPORTING
        PERSON                         0 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         WITH            8    SHARED DISPOSITIVE POWER

                                       1,278,651 shares

- ----------------------- ----- --------------------------------------------------
- ------ -------------------------------------------------------------------------
  9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                1,278,651 shares

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ]


- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                13.0%

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON *

                IN

- ------ -------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                               Page 8 of 33 Pages







- --------------------------------------------------------------------------------
CUSIP No.      0008292131             13G                 Page 9  of  33  Pages
               ----------
- --------------------------------------------------------------------------------

- ------ -------------------------------------------------------------------------
  1    NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                John A. Genest

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                        (a) [ ]
                                                                        (b) [ ]

- ------
- ------ -------------------------------------------------------------------------
  3    SEC USE ONLY

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  4    CITIZENSHIP OR PLACE OF ORGANIZATION

                United States

- ------ -------------------------------------------------------------------------
- ----------------------- ----- --------------------------------------------------
                         5    SOLE VOTING POWER

                                       0 shares
      NUMBER OF
                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
        SHARES           6    SHARED VOTING POWER
     BENEFICIALLY
       OWNED BY                        1,278,651 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         EACH            7    SOLE DISPOSITIVE POWER
      REPORTING
        PERSON                         0 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         WITH            8    SHARED DISPOSITIVE POWER

                                       1,278,651 shares

- ----------------------- ----- --------------------------------------------------
- ------ -------------------------------------------------------------------------
  9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                1,278,651 shares

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ]


- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                13.0%

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON *

                IN

- ------ -------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                               Page 9 of 33 Pages






- --------------------------------------------------------------------------------
CUSIP No.      0008292131             13G                 Page 10  of  33  Pages
               ----------
- --------------------------------------------------------------------------------

- ------ -------------------------------------------------------------------------
  1    NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                Martin J. Mannion

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                        (a) [ ]
                                                                        (b) [ ]

- ------
- ------ -------------------------------------------------------------------------
  3    SEC USE ONLY

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  4    CITIZENSHIP OR PLACE OF ORGANIZATION

                United States

- ------ -------------------------------------------------------------------------
- ----------------------- ----- --------------------------------------------------
                         5    SOLE VOTING POWER

                                       0 shares
      NUMBER OF
                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
        SHARES           6    SHARED VOTING POWER
     BENEFICIALLY
       OWNED BY                        1,278,651 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         EACH            7    SOLE DISPOSITIVE POWER
      REPORTING
        PERSON                         0 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         WITH            8    SHARED DISPOSITIVE POWER

                                       1,278,651 shares

- ----------------------- ----- --------------------------------------------------
- ------ -------------------------------------------------------------------------
  9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                1,278,651 shares

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ]


- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                13.0%

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON *

                IN

- ------ -------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                              Page 10 of 33 Pages







- --------------------------------------------------------------------------------
CUSIP No.      0008292131             13G                 Page 11  of  33  Pages
               ----------
- --------------------------------------------------------------------------------

- ------ -------------------------------------------------------------------------
  1    NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                Ernest K. Jacquet

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                       (a) [ ]
                                                                       (b) [ ]

- ------
- ------ -------------------------------------------------------------------------
  3    SEC USE ONLY

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  4    CITIZENSHIP OR PLACE OF ORGANIZATION

                United States

- ------ -------------------------------------------------------------------------
- ----------------------- ----- --------------------------------------------------
                         5    SOLE VOTING POWER

                                       0 shares
      NUMBER OF
                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
        SHARES           6    SHARED VOTING POWER
     BENEFICIALLY
       OWNED BY                        1,278,651 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         EACH            7    SOLE DISPOSITIVE POWER
      REPORTING
        PERSON                         0 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         WITH            8    SHARED DISPOSITIVE POWER

                                       1,278,651 shares

- ----------------------- ----- --------------------------------------------------
- ------ -------------------------------------------------------------------------
  9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                1,278,651 shares

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ]


- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                13.0%

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON *

                IN

- ------ -------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!



                              Page 11 of 33 Pages







- --------------------------------------------------------------------------------
CUSIP No.      0008292131             13G                 Page 12  of  33  Pages
               ----------
- --------------------------------------------------------------------------------

- ------ -------------------------------------------------------------------------
  1    NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                Bruce R. Evans

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                         (a) [ ]
                                                                         (b) [ ]

- ------
- ------ -------------------------------------------------------------------------
  3    SEC USE ONLY

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  4    CITIZENSHIP OR PLACE OF ORGANIZATION

                United States

- ------ -------------------------------------------------------------------------
- ----------------------- ----- --------------------------------------------------
                         5    SOLE VOTING POWER

                                       0 shares
      NUMBER OF
                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
        SHARES           6    SHARED VOTING POWER
     BENEFICIALLY
       OWNED BY                        1,278,651 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         EACH            7    SOLE DISPOSITIVE POWER
      REPORTING
        PERSON                         0 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         WITH            8    SHARED DISPOSITIVE POWER

                                       1,278,651 shares

- ----------------------- ----- --------------------------------------------------
- ------ -------------------------------------------------------------------------
  9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                1,278,651 shares

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ]


- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                13.0%

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON *

                IN

- ------ -------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!



                              Page 12 of 33 Pages








- --------------------------------------------------------------------------------
CUSIP No.      0008292131             13G                 Page 13  of  33  Pages
               ----------
- --------------------------------------------------------------------------------

- ------ -------------------------------------------------------------------------
  1    NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                Thomas S. Roberts

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                        (a) [ ]
                                                                        (b) [ ]

- ------
- ------ -------------------------------------------------------------------------
  3    SEC USE ONLY

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  4    CITIZENSHIP OR PLACE OF ORGANIZATION

                United States

- ------ -------------------------------------------------------------------------
- ----------------------- ----- --------------------------------------------------
                         5    SOLE VOTING POWER

                                       0 shares
      NUMBER OF
                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
        SHARES           6    SHARED VOTING POWER
     BENEFICIALLY
       OWNED BY                        1,278,651 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         EACH            7    SOLE DISPOSITIVE POWER
      REPORTING
        PERSON                         0 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         WITH            8    SHARED DISPOSITIVE POWER

                                       1,278,651 shares

- ----------------------- ----- --------------------------------------------------
- ------ -------------------------------------------------------------------------
  9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                1,278,651 shares

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ]


- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                13.0%

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON *

                IN

- ------ -------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                              Page 13 of 33 Pages







- --------------------------------------------------------------------------------
CUSIP No.      0008292131             13G                 Page 14  of  33  Pages
               ----------
- --------------------------------------------------------------------------------

- ------ -------------------------------------------------------------------------
  1    NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

                Walter G. Kortschak

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                       (a) [ ]
                                                                       (b) [ ]

- ------
- ------ -------------------------------------------------------------------------
  3    SEC USE ONLY

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  4    CITIZENSHIP OR PLACE OF ORGANIZATION

                United States

- ------ -------------------------------------------------------------------------
- ----------------------- ----- --------------------------------------------------
                         5    SOLE VOTING POWER

                                       0 shares
      NUMBER OF
                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
        SHARES           6    SHARED VOTING POWER
     BENEFICIALLY
       OWNED BY                        1,278,651 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         EACH            7    SOLE DISPOSITIVE POWER
      REPORTING
        PERSON                         0 shares

                        ----- --------------------------------------------------
                        ----- --------------------------------------------------
         WITH            8    SHARED DISPOSITIVE POWER

                                       1,278,651 shares

- ----------------------- ----- --------------------------------------------------
- ------ -------------------------------------------------------------------------
  9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                1,278,651 shares

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ]


- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                13.0%

- ------ -------------------------------------------------------------------------
- ------ -------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON *

                IN

- ------ -------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                              Page 14 of 33 Pages




                                  Schedule 13G
                                  ------------


Item 1(a).        Name of Issuer:  Simulation Sciences, Inc.

Item 1(b).        Address of Issuer's Principal Executive Offices:
                  6015 Valencia Avenue, Brea, California 92621

Item 2(a).        Names of Persons  Filing:  Summit  Ventures III, L.P.,  Summit
                  Partners III, L.P., Summit Investors II, L.P., Stamps, Woodsum
                  & Co. III and Messrs.  E. Roe Stamps,  IV, Stephen G. Woodsum,
                  Gregory M. Avis, John A. Genest, Martin J. Mannion,  Ernest K.
                  Jacquet,  Bruce R.  Evans,  Thomas S.  Roberts  and  Walter G.
                  Kortschak.

                  Summit  Partners  III,  L.P.  is the sole  general  partner of
                  Summit  Ventures  III, L.P.  Stamps,  Woodsum & Co. III is the
                  sole general  partner of Summit  Partners  III,  L.P.  Messrs.
                  Stamps,  Woodsum,  Avis,  Genest,  Mannion,   Jacquet,  Evans,
                  Roberts  and  Kortschak  are  individual  general  partners of
                  Stamps, Woodsum & Co. III and Summit Investors II, L.P.

Item 2(b).        Address of Principal  Business Office or, if None,  Residence:
                  The  address  of  the  principal  business  office  of  Summit
                  Ventures  III,  L.P.,   Summit  Partners  III,  L.P.,   Summit
                  Investors  II,  L.P.,  Stamps,  Woodsum & Co. III and  Messrs.
                  Stamps, Woodsum,  Mannion,  Genest, Jacquet, Evans and Roberts
                  is Summit Partners, 600 Atlantic Avenue, Boston, Massachusetts
                  02210. The address of the principal business office of Messrs.
                  Avis and Kortschak is Summit  Partners,  499 Hamilton  Avenue,
                  Palo Alto, California 94301.

Item 2(c).        Citizenship:   Each  of  Summit  Ventures  III,  L.P.,  Summit
                  Partners III, L.P. and Summit  Investors II, L.P. is a limited
                  partnership organized under the laws of the State of Delaware.
                  Stamps,  Woodsum & Co. III is a general partnership  organized
                  under the laws of the Commonwealth of  Massachusetts.  Each of
                  Messrs.  Stamps,  Woodsum,  Avis,  Mannion,  Genest,  Jacquet,
                  Evans, Roberts and Kortschak is a United States citizen.

Item 2(d).        Title of Class of  Securities:  Common Stock,  $.001 par value
                  per share.

Item 2(e).        CUSIP Number:    0008292131

Item 3.           If this  statement  is filed  pursuant to Rules  13d-1(b),  or
                  13d-2(b), check whether the person filing is a:

                  (a)   [ ]  Broker or Dealer registered under Section 15 of the
                             Securities Exchange Act of 1934 (the "Act").


                               Page 15 of 33 Pages





                  (b)   [ ]   Bank as defined in Section 3(a)(6) of the Act.

                  (c)   [ ]  Insurance Company as defined in Section 3(a)(19) of
                             the Act.

                  (d)   [ ]  Investment  Company  registered  under Section 8 of
                             the Investment Company Act of 1940.

                  (e)   [ ]  Investment  Adviser registered under Section 203 of
                             the Investment Advisers Act of 1940.

                  (f)   [ ]  Employee  Benefit  Plan,   Pension  Fund  which  is
                             subject   to  the   provisions   of  the   Employee
                             Retirement Income Security Act of 1974 or Endowment
                             Fund; see Rule 13d-1(b)(1)(ii)(F) of the Act.

                  (g)   [ ]  Parent  Holding  Company,  in accordance  with Rule
                             13d-1(b)(ii)(G) of the Act.

                  (h)   [ ]  Group, in accordance  with Rule  13d-1(b)(1)(ii)(H)
                             of the Act.

                  Not Applicable.

Item 4.           Ownership.

                  (a)   Amount Beneficially Owned:

                        Each of Summit Ventures III, L.P.,  Summit Partners III,
                        L.P.,  Summit Investors II, L.P., and Stamps,  Woodsum &
                        Co. III  (individually  an "Entity" and collectively the
                        "Entities") may be deemed to own beneficially  1,278,651
                        shares of Common Stock as of December 31, 1996.  Each of
                        Messrs. Stamps, Woodsum, Avis, Mannion, Genest, Jacquet,
                        Evans,  Roberts  and  Kortschak  may  be  deemed  to own
                        beneficially  1,278,651  shares  of  Common  Stock as of
                        December 31, 1996.

                        As of December 31, 1996, Summit  Ventures  III, L.P. was
                        the record  owner of 1,258,149  shares of Common  Stock.
                        Summit Investors II, L.P. was the record owner of 20,502
                        shares of Common  Stock.   The  shares held of record by
                        Summit Ventures III, L.P. and Summit  Investors II, L.P.
                        are  referred  to  herein  collectively  as the  "Record
                        Shares." By virtue of the affiliate relationships among
                        the   Entities,   each  Entity  may  be  deemed  to  own
                        beneficially  all  of the  Record


                              Page 16 of 33 Pages




                        Shares.   Hence,  each  Entity  may  be  deemed  to  own
                        beneficially  1,278,651 shares of Common Stock. In their
                        capacities  as  individual  general  partners of Stamps,
                        Woodsum & Co. III and Summit Investors II, L.P., each of
                        Messrs. Stamps, Woodsum, Avis, Mannion, Genest, Jacquet,
                        Evans,  Roberts  and  Kortschak  may  be  deemed  to own
                        beneficially 1,278,651 shares of Common Stock.

                  (b)   Percent of Class:

                        Summit Ventures III, L.P.:  13.0%
                        Summit Partners III, L.P.:  13.0%
                        Summit Investors  II, L.P.:  13.0%
                        Stamps, Woodsum & Co. III:  13.0%
                        E. Roe Stamps, IV:  13.0%
                        Stephen G. Woodsum:  13.0%
                        Gregory M. Avis:  13.0%
                        Martin J. Mannion:  13.0%
                        John A. Genest:  13.0%
                        Ernest K. Jacquet:  13.0%
                        Bruce R. Evans:  13.0%
                        Walter G. Kortschak:  13.0%
                        Thomas S. Roberts:  13.0%

                        The foregoing  percentages  are calculated  based on the
                        9,471,803   shares  of  Common  Stock   reported  to  be
                        outstanding  in a  Quarterly  Report  on Form  10-Q  for
                        Simulation   Sciences,   Inc.  for  the  quarter   ended
                        September  30,  1996,  as  adjusted   pursuant  to  Rule
                        13d-3(d)(1).

                  (c)   Number of shares as to which such person has:

                        (i)    sole power to vote or to direct the vote:

                               0 shares for each reporting person

                        (ii)   shared power to vote or to direct the vote:

                               Summit Ventures III, L.P.:  1,278,651 shares
                               Summit Partners III, L.P.:  1,278,651 shares
                               Summit Investors II, L.P.:  1,278,651 shares
                               Stamps, Woodsum & Co. III:  1,278,651 shares
                               E. Roe Stamps, IV:  1,278,651 shares
                               Stephen G. Woodsum:  1,278,651 shares
                               Gregory M. Avis:  1,278,651 shares
                               Martin J. Mannion:  1,278,651 shares
                               John A. Genest:  1,278,651 shares
                               Ernest K. Jacquet:  1,278,651 shares
                               Bruce R. Evans:  1,278,651 shares
                               Walter G. Kortschak:  1,278,651 shares
                               Thomas S. Roberts:  1,278,651 shares

                        (iii)  sole power to  dispose or direct the  disposition
                               of:

                               0 shares for each reporting person

                        (iv)   shared power to dispose or direct the disposition
                               of:

                               Summit Ventures III, L.P.:  1,278,651 shares
                               Summit Partners III, L.P.:  1,278,651 shares
                               Summit Investors II, L.P.:  1,278,651 shares
                               Stamps, Woodsum & Co. III:  1,278,651 shares
                               E. Roe Stamps, IV:  1,278,651 shares
                               Stephen G. Woodsum:  1,278,651 shares
                               Gregory M. Avis:  1,278,651 shares
                               Martin J. Mannion:  1,278,651 shares
                               John A. Genest:  1,278,651 shares



                              Page 17 of 33 Pages





                               Ernest K. Jacquet:  1,278,651 shares
                               Bruce R. Evans:  1,278,651 shares
                               Walter G. Kortschak:  1,278,651 shares
                               Thomas S. Roberts:  1,278,651 shares

                  Each of the reporting persons expressly  disclaims  beneficial
                  ownership  of  any  shares  of  Common  Stock  of   Simulation
                  Sciences,Inc. except in the case of Summit Ventures III, L.P.,
                  for the  1,258,149  shares which it holds of record and in the
                  case of Summit Investors II, L.P., for the 20,502 shares which
                  it holds of record.

Item 5.           Ownership of Five Percent or Less of a Class.

                  Not Applicable

Item 6.           Ownership  of More than  Five  Percent  on  Behalf of  Another
                  Person.

                  Not Applicable.

Item 7.           Identification  and  Classification  of the  Subsidiary  which
                  Acquired the Security  Being Reported on By the Parent Holding
                  Company.

                  Not Applicable.



                              Page 18 of 33 Pages





Item 8.           Identification and Classification of Members of the Group.

                  Not  Applicable.  The  reporting  persons  expressly  disclaim
                  membership in a "group" as defined in Rule 13d-1(b)(ii)(H).

Item 9.           Notice of Dissolution of Group.

                  Not Applicable.

Item 10.          Certification.

                  Not  Applicable.  This  statement on Schedule 13G is not filed
                  pursuant to Rule 13d-1(b).



                              Page 19 of 33 Pages






                                   SIGNATURES
                                   ----------

      After reasonable  inquiry and to the best of our knowledge and belief,  we
certify that the information  set forth in this statement is true,  complete and
correct.  We also hereby agree to file this  statement  jointly  pursuant to the
Agreement listed on Exhibit 1 hereto.

Dated:  February 14, 1997

SUMMIT VENTURES III, L.P.                                   *
                                                     ---------------------------
                                                     E. Roe Stamps, IV
By:   Summit Partners III, L.P.

By:   Stamps, Woodsum & Co. III                             *
                                                     ---------------------------
                                                     Stephen G. Woodsum

      By:          *
          ---------------------------
          E. Roe Stamps, IV                                 *
          General Partner                            ---------------------------
                                                     Gregory M. Avis

SUMMIT INVESTORS II, L.P.
                                                            *
                                                     ---------------------------
                                                     Martin J. Mannion

By: /s/ John A. Genest
    ----------------------------------
    General Partner                                  /s/ John A. Genest
                                                     ---------------------------
                                                     John A. Genest

SUMMIT PARTNERS III, L.P.
                                                            *
                                                     ---------------------------
By:   Stamps, Woodsum & Co. III                      Ernest K. Jacquet


      By:            *                                      *
         -----------------------------               ---------------------------
         E. Roe Stamps, IV                           Bruce R. Evans
         General Partner

STAMPS, WOODSUM & CO. III                                   *
                                                     ---------------------------
                                                     Walter G. Kortschak


By:                  *                                      *
   -----------------------------------               ---------------------------
   E. Roe Stamps, IV                                 Thomas S. Roberts
   General Partner



                              Page 20 of 33 Pages





                                                     *By: /s/ John A. Genest
                                                         -----------------------
                                                         John A. Genest,
                                                         Attorney-in-Fact


- --------------------------------------------------------------------------------
* Pursuant to Powers of Attorney on file with the  Commission,  which  Powers of
Attorney are incorporated herein by reference. Copies of such Powers of Attorney
are attached hereto as Exhibit 2.



                              Page 21 of 33 Pages





                                                                       Exhibit 1
                                                                       ---------

                                    AGREEMENT

      Pursuant to Rule  13d-1(f)(1)  under the Securities  Exchange Act of 1934,
the undersigned hereby agree that only one statement  containing the information
required by Schedule 13G need be filed with respect to the  ownership by each of
the undersigned of shares of Common Stock of Simulation Sciences, Inc.

      This  agreement  may be  executed in any number of  counterparts,  each of
which shall be deemed an original.

      EXECUTED this 14th day of February, 1997.

SUMMIT VENTURES III, L.P.                                     *
                                                       -------------------------
                                                       E. Roe Stamps, IV
By:   Summit Partners III, L.P.
                                                              *
                                                       -------------------------
By:   Stamps, Woodsum & Co. III                        Stephen G. Woodsum

                                                              *
                                                       -------------------------
      By:         *                                    Gregory M. Avis
         --------------------------
          E. Roe Stamps, IV
          General Partner                                     *
                                                       -------------------------
                                                       Martin J. Mannion
SUMMIT INVESTORS II, L.P.
                                                       /s/ John A. Genest
                                                       -------------------------
                                                       John A. Genest

By: /s/ John A. Genest                                        *
    --------------------------------                   ------------------------
      General Partner                                  Ernest K. Jacquet

                                                              *
                                                       -------------------------
SUMMIT PARTNERS III, L.P.                              Bruce R. Evans

By:   Stamps, Woodsum & Co. III                               *
                                                       -------------------------
                                                       Walter G. Kortschak

      By:         *                                           *
          --------------------------                   -------------------------
           E. Roe Stamps, IV                           Thomas S. Roberts
           General Partner




                              Page 22 of 33 Pages




STAMPS, WOODSUM & CO. III


By:       *
    ----------------------------
    E. Roe Stamps, IV
    General Partner


                                                     *By: /s/ John A. Genest
                                                         -----------------------
                                                          John A. Genest,
                                                          Attorney-in-Fact


- --------------------------------------------------------------------------------
*     Pursuant to Powers of Attorney on file with the  Commission,  which Powers
      of Attorney are incorporated herein by reference. Copies of such Powers of
      Attorney are attached hereto as Exhibit 2.





                                                                       Exhibit 2
                                                                       ---------

                                 POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS,  that each person whose  signature  appears
below hereby constitutes and appoints each and any of E. Roe Stamps, IV, Stephen
G.  Woodsum and John A. Genest his true and lawful  attorney-in-fact  and agent,
with full power of  substitution  and  resubstitution,  for him and in his name,
place and stead,  in any and all  capacities  (until revoked in writing) to sign
any and all instruments,  certificates and documents  required to be executed on
behalf of himself  individually or on behalf of each or any of Summit  Ventures,
L.P., Summit Partners,  L.P., Stamps,  Woodsum & Co., Summit Partners' Holdings,
L.P., Summit Ventures II, L.P., Summit Partners II, L.P., Stamps,  Woodsum & Co.
II, SV Eurofund C.V., SV International,  L.P., Stamps,  Woodsum  International &
Co., Summit  Investors,  L.P.,  Summit Investors II, L.P., Summit Investors III,
L.P.,  Summit Ventures III, L.P., Summit Partners III, L.P.,  Stamps,  Woodsum &
Co. III, Summit Ventures IV, L.P., Summit Partners IV, L.P.,  Stamps,  Woodsum &
Co., IV,  Summit  Subordinated  Debt Fund,  L.P.,  Summit  Partners SD, L.P., SW
Management Corp., Summit Management Co., Summit Subordinated Debt Fund II, L.P.,
and Summit Partners SD II, LLC, pursuant to sections 13 and 16 of the Securities
Exchange  Act of  1934,  as  amended  (the  "Exchange  Act"),  and  any  and all
regulations  promulgated  thereunder,  and to file the same,  with all  exhibits
thereto,  and any other documents in connection  therewith,  with the Securities
and Exchange Commission,  and with any other entity when and if such is mandated
by the Exchange Act or by the By-laws of the National  Association of Securities
Dealers,  granting unto said attorney-in-fact and agent full power and authority
to do and perform each and every act and thing  requisite and necessary fully to
all intents and  purposes as she might or could do in person  thereby  ratifying
and confirming all that said  attorney-in-fact  and agent,  or her substitute or
substitutes, may lawfully do or cause to be done by virtue hereof.



                              Page 24 of 33 Pages








     IN WITNESS  WHEREOF, this Power of Attorney  has been signed as of the 10th
day of February, 1997.

                                             /s/ E. Roe Stamps, IV 
                                             -----------------------------------
                                             E. Roe Stamps, IV

    Commonwealth of Massachusetts   )
                                    ) ss:
    County of Suffolk               )

    

     On this  10th day of  February,  1997,  before  me  personally  came E. Roe
Stamps, IV,known to me to be the person described and who executed the foregoing
instrument that he acknowledged that he executed the same.

    [Notary Seal]
                                               /s/ Cynthia R. Freedman
                                               ---------------------------------
                                               Notary Public

                                               October 20, 2000
                                               ---------------------------------
                                               My Comission expires:




                                  Page 25 of 33





     IN WITNESS  WHEREOF, this Power of Attorney  has been signed as of the 10th
day of February, 1997.

                                             /s/ Stephen G. Woodsum
                                             -----------------------------------
                                             Stephen G. Woodsum

    Commonwealth of Massachusetts   )
                                    ) ss:
    County of Suffolk               )

    

     On this 10th day of  February,  1997,  before me  personally  came  Stephen
G.Woodsum, known to me to be the person described and who executed the foregoing
instrument that he acknowledged that he executed the same.

    [Notary Seal]
                                               
                                               /s/ Cynthia R. Freedman          
                                               ---------------------------------
                                               Notary Public                    
                                                                                
                                               October 20, 2000                 
                                               ---------------------------------
                                               My Comission expires:            



                                               
                                  Page 26 of 33



     IN WITNESS  WHEREOF, this Power of Attorney  has been signed as of the 10th
day of February, 1997.

                                             /s/ Martin J. Mannion
                                             -----------------------------------
                                             Martin J. Mannion

    Commonwealth of Massachusetts   )
                                    ) ss:
    County of Suffolk               )

    

     On this 10th day of February,  1997,  before me  personally  came Martin J.
Mannion,  known to me to be the person  described and who executed the foregoing
instrument that he acknowledged that he executed the same.

    [Notary Seal]
                                               
                                               /s/ Cynthia R. Freedman          
                                               ---------------------------------
                                               Notary Public                    
                                                                                
                                               October 20, 2000                 
                                               ---------------------------------
                                               My Comission expires:            
                                               
                                  Page 27 of 33




     IN WITNESS  WHEREOF, this Power of Attorney  has been signed as of the 10th
day of February, 1997.

                                             /s/ John A. Genest
                                             -----------------------------------
                                             John A. Genest

    Commonwealth of Massachusetts   )
                                    ) ss:
    County of Suffolk               )

    

     On this  10th day of  February,  1997,  before me  personally  came John A.
Genest,  known to me to be the person  described  and who executed the foregoing
instrument that he acknowledged that he executed the same.

    [Notary Seal]
                                               /s/ Cynthia R. Freedman          
                                               ---------------------------------
                                               Notary Public                    
                                                                                
                                               October 20, 2000                 
                                               ---------------------------------
                                               My Comission expires:            
                                               

                                  Page 28 of 33




     IN WITNESS  WHEREOF,  this Power of Attorney  has been signed as of the 3rd
day of February, 1997.

                                             /s/ Gregory M. Avis
                                             -----------------------------------
                                             Gregory M. Avis

    State of California             )
                                    ) ss:
    County of Santa Clara           )

    

     On this 3rd  day of February,  1997,  before me personally  came Gregory M.
Avis,  known to me to be the person  described  and who executed  the  foregoing
instrument that he acknowledged that he executed the same.

    [Notary Seal]
                                               /s/ Katherine C. Ely          
                                               ---------------------------------
                                               Notary Public                    
                                                                                
                                               May 28, 2000                 
                                               ---------------------------------
                                               My Comission expires:            
                                               

                                  Page 29 of 33




     IN WITNESS  WHEREOF, this Power of Attorney  has been signed as of the 10th
day of February, 1997.

                                             /s/ Ernest K. Jacquet
                                             -----------------------------------
                                             Ernest K. Jacquet

    Commonwealth of Massachusetts   )
                                    ) ss:
    County of Suffolk               )

    

     On this 10th day of February,  1997,  before me  personally  came Ernest K.
Jacquet,  known to me to be the person  described and who executed the foregoing
instrument that he acknowledged that he executed the same.

    [Notary Seal]
                                               /s/ Cynthia R. Freedman          
                                               ---------------------------------
                                               Notary Public                    
                                                                                
                                               October 20, 2000                 
                                               ---------------------------------
                                               My Comission expires:            
                                               

                                  Page 30 of 33




     IN WITNESS  WHEREOF, this Power of Attorney  has been signed as of the 10th
day of February, 1997.

                                             /s/ Thomas S. Roberts
                                             -----------------------------------
                                             Thomas S. Roberts

    Commonwealth of Massachusetts   )
                                    ) ss:
    County of Suffolk               )

    

     On this 10th day of February,  1997,  before me  personally  came Thomas S.
Roberts,  known to me to be the person  described and who executed the foregoing
instrument that he acknowledged that he executed the same.

    [Notary Seal]
                                               
                                               /s/ Cynthia R. Freedman          
                                               ---------------------------------
                                               Notary Public                    
                                                                                
                                               October 20, 2000                 
                                               ---------------------------------
                                               My Comission expires:            

                                               
                                  Page 31 of 33




     IN WITNESS  WHEREOF, this Power of Attorney  has been signed as of the 10th
day of February, 1997.

                                             /s/ Bruce R. Evans
                                             -----------------------------------
                                             Bruce R. Evans

    Commonwealth of Massachusetts   )
                                    ) ss:
    County of Suffolk               )

    

     On this 10th day of  February,  1997,  before me  personally  came Bruce R.
Evans,  known to me to be the person  described  and who executed the  foregoing
instrument that he acknowledged that he executed the same.

    [Notary Seal]
                                               
                                               /s/ Cynthia R. Freedman          
                                               ---------------------------------
                                               Notary Public                    
                                                                                
                                               October 20, 2000                 
                                               ---------------------------------
                                               My Comission expires:            
                                               


                                  Page 32 of 33




     IN WITNESS  WHEREOF,  this Power of Attorney  has been signed as of the 3rd
day of February, 1997.

                                             /s/ Walter G. Kortschak
                                             -----------------------------------
                                             Walter G. Kortschak

    State of California             )
                                    ) ss:
    County of Santa Clara           )

    

     On this 3rd day of  February,  1997,  before me  personally  came Walter G.
Kortschak, known to me to be the person described and who executed the foregoing
instrument that he acknowledged that he executed the same.

    [Notary Seal]
                                               /s/ Katherine C. Ely
                                               ---------------------------------
                                               Notary Public

                                               May 28, 2000
                                               ---------------------------------
                                               My Comission expires:




                                  Page 33 of 33

   




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