VENTANA MEDICAL SYSTEMS INC
SC 13G, 1998-02-17
SURGICAL & MEDICAL INSTRUMENTS & APPARATUS
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<PAGE>
 
                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549

                                  ___________

                                 SCHEDULE 13G
                                (Rule 13d-102)

            INFORMATION STATEMENT PURSUANT TO RULES 13d-1 AND 13d-2
                   UNDER THE SECURITIES EXCHANGE ACT OF 1934
                             (Amendment No. 1)/1/


                         Ventana Medical Systems, Inc.
                         -----------------------------
                               (Name of Issuer)

                   Common Stock, $0.001 Par Value Per Share
                   ----------------------------------------
                        (Title of Class of Securities)

                                   92276H106
                            -----------------------
                                (CUSIP Number)

                                  -----------




_______________________

/1/  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 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).



                              Page 1 of 15 Pages
<PAGE>
 
- -----------------------                                  ---------------------
  CUSIP NO.  92276H106              13G                    PAGE 2 OF 15 PAGES
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                                                                                
     James E. Daverman                                                         
     ###-##-####          
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4                                 
      United States of America

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5                                                       
     NUMBER OF            None
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6       
                          1,270,420
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7       
    REPORTING             None
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8       
                          1,270,420
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9                           
      1,270,420
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10           
                                                                    [_]
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11           
      9.7%                                                               

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

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

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>
 
- -----------------------                                  ---------------------
  CUSIP NO.  92276H106              13G                    PAGE 3 OF 15 PAGES
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                                                                                
      Marquette Venture Partners, L.P.
      36-3504827                    
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

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

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5                                                       
     NUMBER OF            None
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6       
                          1,016,140
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7       
    REPORTING             None
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8       
                          1,016,140
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9                           
      1,016,140
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10           
                                                                    [_]
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11           
      7.8%                                                               

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

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

<PAGE>
 
- -----------------------                                  ---------------------
  CUSIP NO.  92276H106              13G                    PAGE 4 OF 15 PAGES
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                                                                                
      Marquette Venture Associates, L.P.
      36-3504831          
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

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

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5                                                       
     NUMBER OF            None             
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6       
                          1,016,140
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7       
    REPORTING             None
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8       
                          1,016,140
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9                           
      1,016,140
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10           
                                                                    [_]
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11           
      7.8%                                                                   

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

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

<PAGE>
 
- -----------------------                                  ---------------------
  CUSIP NO.  92276H106              13G                    PAGE 5 OF 15 PAGES
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
      
      Marquette Management Partners                                            
      36-3504830          
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

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

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5                                                       
     NUMBER OF            None
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6       
                          1,016,140
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7       
    REPORTING             None
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8       
                          1,016,140
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9                           
      1,016,140
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10           
                                                                    [_]
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11           
      7.8%                                                               

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

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

<PAGE>
 
- -----------------------                                  ---------------------
  CUSIP NO.  92276H106              13G                    PAGE 6 OF 15 PAGES
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
      
      Marquette Venture Partners II, L.P.                                      
      36-3820302          
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

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

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5                                                       
     NUMBER OF            None
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6       
                          247,218
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7       
    REPORTING             None
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8       
                          247,218
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9                           
      247,218
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10           
                                                                    [_]
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11           
      1.9%                                                                     

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

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

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>
 
- -----------------------                                  ---------------------
  CUSIP NO.  92276H106              13G                    PAGE 7 OF 15 PAGES
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                                                                                
      MVP II Affiliates Fund, L.P.
      36-3871877                    
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

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

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5                                                       
     NUMBER OF            None               
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6       
                          7,062
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7       
    REPORTING             None
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8       
                           7,062
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9                           
       7,062
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10           
                                                                    [_]
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11           
      0.1%

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

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

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>
 
- -----------------------                                  ---------------------
  CUSIP NO.  92276H106              13G                    PAGE 8 OF 15 PAGES
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
      
      Marquette General II, L.P.                                               
      36-3820303          
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

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

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5                                                       
     NUMBER OF            None
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6       
                          254,280
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7       
    REPORTING             None
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8       
                          254,280
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9                           
      254,280
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10           
                                                                    [_]
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11           
      1.9%                                                                     

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

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

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>
 
- -----------------------                                  ---------------------
  CUSIP NO.  92276H106              13G                    PAGE 9 OF 15 PAGES
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                                                                                
      Redfish Partners, L.P. (formerly known as JED Limited Partnership)
      36-3760173
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

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

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5                                                       
     NUMBER OF            None              
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6       
                          254,280
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7       
    REPORTING             None
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8       
                          254,280
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9                           
      254,280
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10           
                                                                    [_]
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11           
      1.9%                                                                    

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

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

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>
 
- -----------------------                                  ---------------------
  CUSIP NO.  92276H106              13G                   PAGE 10 OF 15 PAGES
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                                                                                
      Bluefish Partners, L.P. (formerly known as LDR Limited Partnership)
      36-3760176
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

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

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5                                                       
     NUMBER OF            None             
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6       
                          254,280
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7       
    REPORTING             None
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8       
                          254,280
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9                           
      254,280
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10           
                                                                    [_]
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11           
      1.9%

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

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

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>
 
- -----------------------                                  ---------------------
  CUSIP NO.  92276H106              13G                   PAGE 11 OF 15 PAGES
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                                                                                
      Lloyd D. Ruth
      ###-##-####
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4                                 
      United States of America

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5                                                       
     NUMBER OF            None
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6       
                          1,270,420
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7       
    REPORTING             None
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8       
                          1,270,420
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9                           
      1,270,420
- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10           
                                                                    [_]
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11           
      9.7%

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

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

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>
 
Item 1(a) Name of Issuer:
          -------------- 

          Ventana Medical Systems, Inc. ("Ventana")

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

          3865 N. Business Center Drive
          Tucson, AZ 85705

Item 2(a) Name of Person Filing:
          --------------------- 

          This Schedule 13G is being jointly filed by each of the following
          persons pursuant to Rule 13d-(1)(f) promulgated by the Securities and
          Exchange Commission pursuant to Section 13 of the Securities Exchange
          Act of 1934, as amended (the "Act"): (i) Marquette Venture Partners,
          L.P. ("MVP"), a Delaware limited partnership, by virtue of its direct
          beneficial ownership of 1,016,140 shares of common stock, par value
          $0.001 per share (the "Common Stock"), of Ventana; (ii) Marquette
          Venture Associates, L.P. ("MVA"), a Delaware limited partnership, as
          the sole general partner of MVP; (iii) Marquette Management Partners
          ("MMP"), a Delaware general partnership, as the sole general partner
          of MVA; (iv) Marquette Venture Partners II, L.P. ("MVP II"), a
          Delaware limited partnership, by virtue of its direct beneficial
          ownership of 247,218 shares of Common Stock; (v) MVP II Affiliates
          Fund, L.P. ("MVP II Affiliates"), a Delaware limited partnership, by
          virtue of its direct beneficial ownership of 7,062 shares of Common
          Stock; (vi) Marquette General II, L.P. ("MG II"), a Delaware limited
          partnership, as the sole general partner of MVP II and MVP II
          Affiliates; (vii) Redfish Partners, L.P. ("Redfish"), a Delaware
          limited partnership, as a general partner of MG II; (viii) Bluefish
          Partners, L.P. ("Bluefish"), a Delaware limited partnership, as a
          general partner of MG II; (ix) James E. Daverman ("Mr. Daverman"), an
          individual, as an affiliate of Redfish and MMP; and (x) Lloyd D. Ruth
          ("Mr. Ruth"), an individual, as an affiliate of Bluefish and MMP. MVP,
          MVA, MMP, MVP II, MVP II Affiliates, MG II, Redfish, Bluefish, Mr.
          Daverman and Mr. Ruth are hereinafter collectively referred to as the
          "Reporting Persons."

          The Reporting Persons have entered into a Joint Filing Agreement,
          dated February 13, 1997, a copy of which was previously filed with
          this Schedule 13G, pursuant to which the Reporting Persons have agreed
          to file this statement jointly in accordance with the provisions of
          Rule 13d-1(f)(1) under the Act.



                              Page 12 of 15 Pages
<PAGE>
 
Item 2(b) Address of Principal Business Office or, if none,
          Residence:
          ------------------------------------------------                      

          The address of the principal business office of each of the Reporting
          Persons is:

          Corporate 500 Centre
          520 Lake Cook Road, Suite 450
          Deerfield, Illinois 60015

Item 2(c) Citizenship
          -----------

          MVP, MVA, MVP II, MVP II Affiliates, MG II, Bluefish and Redfish are
          limited partnerships organized under the laws of Delaware. MMP is a
          general partnership organized under the laws of Illinois. Mr. Daverman
          and Mr. Ruth are United States citizens.

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

          Common Stock, $0.001 par value per share.

Item 2(e) CUSIP No.:
          --------- 

          92276H106

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

          The persons filing are not described in any category listed under this
          item.

Item 4    Ownership
          ---------

          MVA is the sole general partner of MVP; MMP is the sole general
          partner of MVA; MG II is the sole general partner of both MVP II and
          MVP II Affiliates; Bluefish and Redfish are the general partners of MG
          II; Mr. Daverman is an affiliate of Redfish and MMP; and Mr. Ruth is
          an affiliate of Bluefish and MMP. As a result of such relationships,
          (i) MVA, MMP and both Messrs. Daverman and Ruth may be deemed to share
          voting and dispositive power with respect to the shares held by MVP
          and (ii) MG II, Bluefish, Redfish and both Mr. Daverman and Mr. Ruth
          may be deemed to share voting and dispositive power with respect to
          the shares held by MVP II and MVP II Affiliates. The information set
          forth on the cover pages is hereby incorporated by reference.

          Each Reporting Person expressly disclaims beneficial ownership of any
          shares of Common Stock beneficially owned by each other Reporting
          Person.



                              Page 13 of 15 Pages

<PAGE>
 
Item 5    Ownership of Five Percent or Less of a Class:
          -------------------------------------------- 

          If this statement is being filed to report the fact that as of the
          date hereof the reporting person has ceased to be the beneficial owner
          of more than five percent of the class of securities, check the
          following [_].

Item 6    Ownership of More Than Five Percent on Behalf of
          Another Person:
          ------------------------------------------------

          No other person has the right to receive or the power to direct the
          receipt of dividends from, or other proceeds from the sale, of the
          shares.

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 14 of 15 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.

Date:  February 14, 1998

                              MARQUETTE VENTURE PARTNERS, L.P.

                              MARQUETTE VENTURE ASSOCIATES, L.P.

                              MARQUETTE MANAGEMENT PARTNERS

                              MARQUETTE VENTURE PARTNERS II, L.P.

                              MVP II AFFILIATES FUND, L.P.

                              MARQUETTE GENERAL II, L.P.
 
                              BLUEFISH PARTNERS, L.P.


                              By:  /s/  Lloyd D. Ruth
                                   --------------------
                                   Lloyd D. Ruth
                                   as authorized signatory


                              REDFISH PARTNERS, L.P.


                              By: /s/  James E. Daverman
                                  ------------------------
                                   James E. Daverman
                                   as authorized signatory


                                  /s/  James E. Daverman
                                  -------------------------
                                  JAMES E. DAVERMAN


                                  /s/ Lloyd D. Ruth
                                  -------------------
                                  LLOYD D. RUTH



                              Page 15 of 15 Pages



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