WARBURG PINCUS VENTURES LP
SC 13G, 1997-02-14
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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. __)*

                             Transition Systems, Inc.
                                (Name of Issuer)

                    Common Stock, par value $.01 per share
                         (Title of Class of Securities)

                                   893715 10 2
                                 (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  on 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).

                               Page 1 of 9 Pages

<PAGE>


- -----------------------------------  ---------  --------------------------------
CUSIP No.  893715102                    13G             Page  2  of  9  Pages

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

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

           Warburg, Pincus Ventures, L.P.           I.D. # 13-3784037
- ---------- ---------------------------------------------------------------------
        2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                  (a)
                                                                  (b) [X]
- ---------- ---------------------------------------------------------------------


        3  SEC USE ONLY

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

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

                            -0-
- --------------------------------------------------------------------------------
     NUMBER OF           6  SHARED VOTING POWER
      SHARES
   BENEFICIALLY             6,125,000
     OWNED BY
       EACH          ------ ----------------------------------------------------
     REPORTING           7  SOLE DISPOSITIVE POWER
      PERSON
       WITH                 -0-
                     ------ ----------------------------------------------------
                         8  SHARED DISPOSITIVE POWER

                            6,125,000
- ---------- ---------------------------------------------------------------------
        9  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           6,125,000
- ---------- ---------------------------------------------------------------------
       10  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
           CERTAIN SHARES*     [ ]
- ---------- ---------------------------------------------------------------------
       11  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

           36.3%
- ---------- ---------------------------------------------------------------------
       12  TYPE OF REPORTING PERSON*

           PN
- ---------- ---------------------------------------------------------------------

                      *SEE INSTRUCTION BEFORE FILLING OUT!

<PAGE>




- -----------------------------------  ---------  --------------------------------
CUSIP No.  893715102                    13G             Page  3  of  9  Pages

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

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

           Warburg, Pincus & Co.                  I.D. # 13-6358475

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

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

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

           New York
- -------------------- ------ ----------------------------------------------------
                         5  SOLE VOTING POWER

                            -0-
                     ------ ----------------------------------------------------
     NUMBER OF           6  SHARED VOTING POWER
      SHARES
   BENEFICIALLY               6,125,000
     OWNED BY
       EACH          ------ ----------------------------------------------------
     REPORTING           7  SOLE DISPOSITIVE POWER
      PERSON
       WITH                 -0-
                     ------ ----------------------------------------------------
                         8  SHARED DISPOSITIVE POWER

                            6,125,000
- ---------- ---------------------------------------------------------------------
        9  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           6,125,000
- ---------- ---------------------------------------------------------------------
       10  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
           CERTAIN SHARES*      [ ]
- ---------- ---------------------------------------------------------------------
       11  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

           36.3%
- ---------- ---------------------------------------------------------------------
       12  TYPE OF REPORTING PERSON*

           PN
- ---------- ---------------------------------------------------------------------

                      *SEE INSTRUCTION BEFORE FILLING OUT!

<PAGE>




- -----------------------------------  ---------  --------------------------------
CUSIP No.  893715102                    13G             Page  4  of  9  Pages

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

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

           E.M. Warburg, Pincus & Co., LLC                  I.D. # 13-3536050

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

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

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

           New York
- -------------------- ------ ----------------------------------------------------
                         5  SOLE VOTING POWER

                            -0-
                     ------ ----------------------------------------------------
     NUMBER OF           6  SHARED VOTING POWER
      SHARES
   BENEFICIALLY             6,125,000
     OWNED BY
       EACH          ------ ----------------------------------------------------
     REPORTING           7  SOLE DISPOSITIVE POWER
      PERSON
       WITH                 -0-
                     ------ ----------------------------------------------------
                         8  SHARED DISPOSITIVE POWER

                            6,125,000
- ---------- ---------------------------------------------------------------------
        9  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           6,125,000
- ---------- ---------------------------------------------------------------------
       10  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
           CERTAIN SHARES*     [ ]
- ---------- ---------------------------------------------------------------------
       11  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

           36.3%
- ---------- ---------------------------------------------------------------------
       12  TYPE OF REPORTING PERSON*

           OO
- ---------- ---------------------------------------------------------------------


<PAGE>



Item 1(a).                    Name of Issuer:

                              Transition Systems, Inc. (the "Issuer")

Item 1(b).                    Address of Issuer's Principal Executive Offices:

                              One Boston Place
                              Boston, MA  02108-4423

Items 2(a)                    Name of Person Filing; Address of Principal
and (b).                      Business Office:

                              This  statement  is filed by and on behalf of
                              (a)  Warburg,   Pincus   Ventures,   L.P.,  a
                              Delaware  limited  partnership  ("WPV");  (b)
                              Warburg,  Pincus & Co.,  a New  York  general
                              partnership  ("WP");  and (c)  E.M.  Warburg,
                              Pincus  &  Co.,   LLC,  a  New  York  limited
                              liability company ("EMW LLC"),  which manages
                              WPV. WP, as the sole general  partner of WPV,
                              has a 20%  interest  in the  profits  of WPV.
                              Lionel I. Pincus is the  managing  partner of
                              WP and the managing member of EMW LLC and may
                              be deemed to control both WP and EMW LLC. The
                              members of EMW LLC are substantially the same
                              as the partners of WP. The  business  address
                              of each  of the  foregoing  is 466  Lexington
                              Avenue, New York, New York 10017.

Item 2(c).                    Citizenship:

                              Not Applicable

Item 2(d).                    Title of Class of Securities:

                              Common Stock, par value $.01 per share
                              (the "Common Stock")

Item 2(e).                    CUSIP Number:

                              893715102

Item 3.                       Not Applicable

Item 4.                       Ownership:

                               (a)     6,125,000 shares of Common Stock, as
                                       of December 31, 1996.

                               (b)     36.3%


                               Page 5 of 9 Pages

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                               (c)     (i)      -0-
                                      (ii)      6,125,000
                                      (iii)     -0-
                                      (iv)      6,125,000

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

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

                              Not Applicable

Item 9.                       Notice of Dissolution of Group:

                              Not Applicable

Item 10.                      Certification:

                              Not Applicable


                               Page 6 of 9 Pages

<PAGE>


                                    SIGNATURE

         After reasonable  inquiry and to the best of my knowledge and belief, I
certify that the information  set forth in this statement is true,  complete and
correct.

Dated:  February 14, 1997


                                            WARBURG, PINCUS VENTURES, L.P.

                                            By:      Warburg, Pincus & Co.,
                                                     General Partner


                                            By:  /s/ Stephen Distler
                                                     Stephen Distler, Partner



                                            WARBURG, PINCUS & CO.


                                            By:  /s/ Stephen Distler
                                                     Stephen Distler, Partner



                                           E.M. WARBURG, PINCUS & CO., LLC


                                            By:  /s/ Stephen Distler
                                                     Stephen Distler, Member


                               Page 7 of 9 Pages

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                                 EXHIBITS

Exhibit 1         Joint Filing Agreement, dated February 14, 1997,
                  among the signatories to this Schedule 13G.


                               Page 8 of 9 Pages



<PAGE>

                                                                Exhibit 1

                             JOINT FILING AGREEMENT
                          PURSUANT TO RULE 13d-1(f)(1)

           The undersigned acknowledge and agree that the foregoing statement on
Schedule  13G is  filed  on  behalf  of each of the  undersigned  and  that  all
subsequent amendments to this statement on Schedule 13G shall be filed on behalf
of each of the  undersigned  without the  necessity of filing  additional  joint
filing  agreements.  The undersigned  acknowledge that each shall be responsible
for the timely filing of such amendments,  and for the completeness and accuracy
of the information concerning it contained therein, but shall not be responsible
for the  completeness  and accuracy of the  information  concerning  the others,
except  to the  extent  that  it  knows  or has  reason  to  believe  that  such
information  is  inaccurate.  This  Agreement  may be  executed in any number of
counterparts  and all of such  counterparts  taken together shall constitute one
and the same instrument.

Dated:  February 14, 1997


                                            WARBURG, PINCUS VENTURES, L.P.

                                            By:      Warburg, Pincus & Co.,
                                                     General Partner


                                            By:  /s/ Stephen Distler
                                                     Stephen Distler, Partner



                                            WARBURG, PINCUS & CO.


                                            By:  /s/ Stephen Distler
                                                     Stephen Distler, Partner



                                            E.M. WARBURG, PINCUS & CO., LLC


                                            By:  /s/ Stephen Distler
                                                 Stephen Distler, Member



                                Page 9 of 9 Pages



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