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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549

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

                                  SCHEDULE 13G
                                (Amendment No. )*

           INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO
              RULES 13d-1 (b), (c) AND (d) AND AMENDMENTS THERETO
                           FILED PURSUANT TO 13d-2 (b)

                                FormFactor, Inc.
--------------------------------------------------------------------------------
                                (Name of Issuer)

                                  Common Stock
--------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                   346375 10 8
--------------------------------------------------------------------------------
                                 (CUSIP Number)

                                December 31, 2003
--------------------------------------------------------------------------------
             (Date of Event Which Requires Filing of this Statement)

Check the  appropriate box to designate the rule pursuant to which this Schedule
is filed:

      |_|   Rule 13d-1(b)

      |_|   Rule 13d-1(c)

      |X|   Rule 13d-1(d)

*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).


                               Page 1 of 17 pages


CUSIP No. 346375 10 8                                         Page 2 of 17 Pages
--------------------------------------------------------------------------------
1     NAMES OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      Institutional Venture Partners VII, L.P
--------------------------------------------------------------------------------
2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                        (a)  |_|
                                                                        (b)  |X|
--------------------------------------------------------------------------------
3     SEC USE ONLY


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

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

                        1,718,636
                        --------------------------------------------------------
  NUMBER OF       6     SHARED VOTING POWER
   SHARES
BENEFICIALLY            0
  OWNED BY              --------------------------------------------------------
    EACH          7     SOLE DISPOSITIVE POWER
  REPORTING
   PERSON               1,718,636
    WITH                --------------------------------------------------------
                  8     SHARED DISPOSITIVE POWER

                        0
--------------------------------------------------------------------------------
9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      1,718,636
--------------------------------------------------------------------------------
10    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

      |_|
--------------------------------------------------------------------------------
11    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

      4.7%
--------------------------------------------------------------------------------
12    TYPE OF REPORTING PERSON*

      PN
--------------------------------------------------------------------------------
                      *SEE INSTRUCTION BEFORE FILLING OUT!


CUSIP No. 346375 10 8                                         Page 3 of 17 Pages
--------------------------------------------------------------------------------
1     NAMES OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      Institutional Venture Management VII, L.P
--------------------------------------------------------------------------------
2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                        (a)  |_|
                                                                        (b)  |X|
--------------------------------------------------------------------------------
3     SEC USE ONLY


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

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

                        9,363
                        --------------------------------------------------------
  NUMBER OF       6     SHARED VOTING POWER
   SHARES
BENEFICIALLY            0
  OWNED BY              --------------------------------------------------------
    EACH          7     SOLE DISPOSITIVE POWER
  REPORTING
   PERSON               9,363
    WITH                --------------------------------------------------------
                  8     SHARED DISPOSITIVE POWER

                        0
--------------------------------------------------------------------------------
9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      9,363
--------------------------------------------------------------------------------
10    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

      |_|
--------------------------------------------------------------------------------
11    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

      0.0%
--------------------------------------------------------------------------------
12    TYPE OF REPORTING PERSON*

      PN
--------------------------------------------------------------------------------
                      *SEE INSTRUCTION BEFORE FILLING OUT!


CUSIP No. 346375 10 8                                         Page 4 of 17 Pages
--------------------------------------------------------------------------------
1     NAMES OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      IVP Founders Fund I, L.P
--------------------------------------------------------------------------------
2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                        (a)  |_|
                                                                        (b)  |X|
--------------------------------------------------------------------------------
3     SEC USE ONLY


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

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

                        81,027
                        --------------------------------------------------------
  NUMBER OF       6     SHARED VOTING POWER
   SHARES
BENEFICIALLY            0
  OWNED BY              --------------------------------------------------------
    EACH          7     SOLE DISPOSITIVE POWER
  REPORTING
   PERSON               81,027
    WITH                --------------------------------------------------------
                  8     SHARED DISPOSITIVE POWER

                        0
--------------------------------------------------------------------------------
9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      81,027
--------------------------------------------------------------------------------
10    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

      |_|
--------------------------------------------------------------------------------
11    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

      0.2%
--------------------------------------------------------------------------------
12    TYPE OF REPORTING PERSON*

      PN
--------------------------------------------------------------------------------
                      *SEE INSTRUCTION BEFORE FILLING OUT!


CUSIP No. 346375 10 8                                         Page 5 of 17 Pages
--------------------------------------------------------------------------------
1     NAMES OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      Samuel D. Colella
--------------------------------------------------------------------------------
2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                        (a)  |_|
                                                                        (b)  |X|
--------------------------------------------------------------------------------
3     SEC USE ONLY


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

      United States
--------------------------------------------------------------------------------
                  5     SOLE VOTING POWER

                        13,467
                        --------------------------------------------------------
  NUMBER OF       6     SHARED VOTING POWER
   SHARES
BENEFICIALLY            1,809,026
  OWNED BY              --------------------------------------------------------
    EACH          7     SOLE DISPOSITIVE POWER
  REPORTING
   PERSON               13,467
    WITH                --------------------------------------------------------
                  8     SHARED DISPOSITIVE POWER

                        1,809,026
--------------------------------------------------------------------------------
9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      1,822,493
--------------------------------------------------------------------------------
10    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

      |_|
--------------------------------------------------------------------------------
11    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

      5.0%
--------------------------------------------------------------------------------
12    TYPE OF REPORTING PERSON*

      IN
--------------------------------------------------------------------------------
                      *SEE INSTRUCTION BEFORE FILLING OUT!


CUSIP No. 346375 10 8                                         Page 6 of 17 Pages
--------------------------------------------------------------------------------
1     NAMES OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      Reid W. Dennis
--------------------------------------------------------------------------------
2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                        (a)  |_|
                                                                        (b)  |X|
--------------------------------------------------------------------------------
3     SEC USE ONLY


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

      United States
--------------------------------------------------------------------------------
                  5     SOLE VOTING POWER

                        13,135
                        --------------------------------------------------------
  NUMBER OF       6     SHARED VOTING POWER
   SHARES
BENEFICIALLY            1,809,026
  OWNED BY              --------------------------------------------------------
    EACH          7     SOLE DISPOSITIVE POWER
  REPORTING
   PERSON               13,135
    WITH                --------------------------------------------------------
                  8     SHARED DISPOSITIVE POWER

                        1,809,026
--------------------------------------------------------------------------------
9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      1,822,161
--------------------------------------------------------------------------------
10    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

      |_|
--------------------------------------------------------------------------------
11    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

      5.0%
--------------------------------------------------------------------------------
12    TYPE OF REPORTING PERSON*

      IN
--------------------------------------------------------------------------------
                      *SEE INSTRUCTION BEFORE FILLING OUT!


CUSIP No. 346375 10 8                                         Page 7 of 17 Pages
--------------------------------------------------------------------------------
1     NAMES OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      Mary Jane Elmore
--------------------------------------------------------------------------------
2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                        (a)  |_|
                                                                        (b)  |X|
--------------------------------------------------------------------------------
3     SEC USE ONLY


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

      United States
--------------------------------------------------------------------------------
                  5     SOLE VOTING POWER

                        0
                        --------------------------------------------------------
  NUMBER OF       6     SHARED VOTING POWER
   SHARES
BENEFICIALLY            1,809,026
  OWNED BY              --------------------------------------------------------
    EACH          7     SOLE DISPOSITIVE POWER
  REPORTING
   PERSON               0
    WITH                --------------------------------------------------------
                  8     SHARED DISPOSITIVE POWER

                        1,809,026
--------------------------------------------------------------------------------
9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      1,809,026
--------------------------------------------------------------------------------
10    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

      |_|
--------------------------------------------------------------------------------
11    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

      4.9%
--------------------------------------------------------------------------------
12    TYPE OF REPORTING PERSON*

      IN
--------------------------------------------------------------------------------
                      *SEE INSTRUCTION BEFORE FILLING OUT!


CUSIP No. 346375 10 8                                         Page 8 of 17 Pages
--------------------------------------------------------------------------------
1     NAMES OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      Norman A. Fogelsong
--------------------------------------------------------------------------------
2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                        (a)  |_|
                                                                        (b)  |X|
--------------------------------------------------------------------------------
3     SEC USE ONLY


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

      United States
--------------------------------------------------------------------------------
                  5     SOLE VOTING POWER

                        10,676
                        --------------------------------------------------------
  NUMBER OF       6     SHARED VOTING POWER
   SHARES
BENEFICIALLY            1,809,026
  OWNED BY              --------------------------------------------------------
    EACH          7     SOLE DISPOSITIVE POWER
  REPORTING
   PERSON               10,676
    WITH                --------------------------------------------------------
                  8     SHARED DISPOSITIVE POWER

                        1,809,026
--------------------------------------------------------------------------------
9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      1,819,702
--------------------------------------------------------------------------------
10    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

      |_|
--------------------------------------------------------------------------------
11    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

      4.9%
--------------------------------------------------------------------------------
12    TYPE OF REPORTING PERSON*

      IN
--------------------------------------------------------------------------------
                      *SEE INSTRUCTION BEFORE FILLING OUT!


CUSIP No. 346375 10 8                                         Page 9 of 17 Pages
--------------------------------------------------------------------------------
1     NAMES OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      Ruthann Quindlen
--------------------------------------------------------------------------------
2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                        (a)  |_|
                                                                        (b)  |X|
--------------------------------------------------------------------------------
3     SEC USE ONLY


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

      United States
--------------------------------------------------------------------------------
                  5     SOLE VOTING POWER

                        0
                        --------------------------------------------------------
  NUMBER OF       6     SHARED VOTING POWER
   SHARES
BENEFICIALLY            1,809,026
  OWNED BY              --------------------------------------------------------
    EACH          7     SOLE DISPOSITIVE POWER
  REPORTING
   PERSON               0
    WITH                --------------------------------------------------------
                  8     SHARED DISPOSITIVE POWER

                        1,809,026
--------------------------------------------------------------------------------
9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      1,809,026
--------------------------------------------------------------------------------
10    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

      |_|
--------------------------------------------------------------------------------
11    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

      4.9%
--------------------------------------------------------------------------------
12    TYPE OF REPORTING PERSON*

      IN
--------------------------------------------------------------------------------
                      *SEE INSTRUCTION BEFORE FILLING OUT!


CUSIP No. 346375 10 8                                        Page 10 of 17 Pages
--------------------------------------------------------------------------------
1     NAMES OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      L. James Strand
--------------------------------------------------------------------------------
2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                        (a)  |_|
                                                                        (b)  |X|
--------------------------------------------------------------------------------
3     SEC USE ONLY


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

      United States
--------------------------------------------------------------------------------
                  5     SOLE VOTING POWER

                        13,938
                        --------------------------------------------------------
  NUMBER OF       6     SHARED VOTING POWER
   SHARES
BENEFICIALLY            1,809,026
  OWNED BY              --------------------------------------------------------
    EACH          7     SOLE DISPOSITIVE POWER
  REPORTING
   PERSON               13,938
    WITH                --------------------------------------------------------
                  8     SHARED DISPOSITIVE POWER

                        1,809,026
--------------------------------------------------------------------------------
9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      1,822,964
--------------------------------------------------------------------------------
10    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

      |_|
--------------------------------------------------------------------------------
11    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

      5.0%
--------------------------------------------------------------------------------
12    TYPE OF REPORTING PERSON*

      IN
--------------------------------------------------------------------------------
                      *SEE INSTRUCTION BEFORE FILLING OUT!


CUSIP No. 346375 10 8                                        Page 11 of 17 Pages
--------------------------------------------------------------------------------
1     NAMES OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      William P. Tai
--------------------------------------------------------------------------------
2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                        (a)  |_|
                                                                        (b)  |X|
--------------------------------------------------------------------------------
3     SEC USE ONLY


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

      United States
--------------------------------------------------------------------------------
                  5     SOLE VOTING POWER

                        9,585
                        --------------------------------------------------------
  NUMBER OF       6     SHARED VOTING POWER
   SHARES
BENEFICIALLY            1,727,999
  OWNED BY              --------------------------------------------------------
    EACH          7     SOLE DISPOSITIVE POWER
  REPORTING
   PERSON               9,585
    WITH                --------------------------------------------------------
                  8     SHARED DISPOSITIVE POWER

                        1,727,999
--------------------------------------------------------------------------------
9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      1,737,584
--------------------------------------------------------------------------------
10    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

      |_|
--------------------------------------------------------------------------------
11    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

      4.9%
--------------------------------------------------------------------------------
12    TYPE OF REPORTING PERSON*

      IN
--------------------------------------------------------------------------------
                      *SEE INSTRUCTION BEFORE FILLING OUT!


CUSIP No. 346375 10 8                                        Page 12 of 17 Pages
--------------------------------------------------------------------------------
1     NAMES OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      T. Peter Thomas
--------------------------------------------------------------------------------
2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                        (a)  |_|
                                                                        (b)  |X|
--------------------------------------------------------------------------------
3     SEC USE ONLY


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

      United States
--------------------------------------------------------------------------------
                  5     SOLE VOTING POWER

                        51,157
                        --------------------------------------------------------
  NUMBER OF       6     SHARED VOTING POWER
   SHARES
BENEFICIALLY            1,809,026
  OWNED BY              --------------------------------------------------------
    EACH          7     SOLE DISPOSITIVE POWER
  REPORTING
   PERSON               51,157
    WITH                --------------------------------------------------------
                  8     SHARED DISPOSITIVE POWER

                        1,809,026
--------------------------------------------------------------------------------
9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      1,860,183
--------------------------------------------------------------------------------
10    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

      |_|
--------------------------------------------------------------------------------
11    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

      5.1%
--------------------------------------------------------------------------------
12    TYPE OF REPORTING PERSON*

      IN
--------------------------------------------------------------------------------
                      *SEE INSTRUCTION BEFORE FILLING OUT!


CUSIP No. 346375 10 8                                        Page 13 of 17 Pages
--------------------------------------------------------------------------------
1     NAMES OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      Geoffrey Y. Yang
--------------------------------------------------------------------------------
2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                        (a)  |_|
                                                                        (b)  |X|
--------------------------------------------------------------------------------
3     SEC USE ONLY


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

      United States
--------------------------------------------------------------------------------
                  5     SOLE VOTING POWER

                        20,266
                        --------------------------------------------------------
  NUMBER OF       6     SHARED VOTING POWER
   SHARES
BENEFICIALLY            1,809,026
  OWNED BY              --------------------------------------------------------
    EACH          7     SOLE DISPOSITIVE POWER
  REPORTING
   PERSON               20,266
    WITH                --------------------------------------------------------
                  8     SHARED DISPOSITIVE POWER

                        1,809,026
--------------------------------------------------------------------------------
9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      1,829,292
--------------------------------------------------------------------------------
10    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

      |_|
--------------------------------------------------------------------------------
11    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

      5.0%
--------------------------------------------------------------------------------
12    TYPE OF REPORTING PERSON*

      IN
--------------------------------------------------------------------------------
                      *SEE INSTRUCTION BEFORE FILLING OUT!


CUSIP No. 346375 10 8                                        Page 14 of 17 Pages
--------------------------------------------------------------------------------

Item 1.

      (a)   Name of Issuer: FormFactor, Inc.

      (b)   Address of  Issuer's  Principal  Executive  Offices:  2140  Research
            Drive, Livermore, CA 94550

Item 2.

      (a)   Name of Persons Filing:

                  Institutional Venture Partners VII, L.P. ("IVP")
                  Institutional Venture Management VII, L.P. ("IVM")
                  IVP Founders Fund I, L.P. ("FFI")
                  Samuel D. Colella ("SDC")
                  Reid W. Dennis ("RWD")
                  Mary Jane Elmore ("MJE") Norman A. Fogelsong ("NAF")
                  Ruthann Quindlen ("RAQ")
                  L. James Strand ("LJS")
                  William P. Tai ("WPT") T. Peter Thomas ("TPT")
                  Geoffrey Y. Yang ("GYY")

IVM is the General Partner of IVP. SDC, RWD, MJE, NAF, RAQ, LJS, WPT, TPT, & GYY
are General  Partners of IVM.  SDC,  RWD,  MJE,  NAF,  RAQ,  LJS, TPT, & GYY are
General Partners of the General Partner of FFI.

      (b)   Address of Principal Business Office or, if None, Residence:

                  3000 Sand Hill Road
                  Building 2, Suite 290
                  Menlo Park, CA  94025

      (c)   Citizenship:

                  IVP, IVM and FFI:  California
                  SDC, RWD, MJE, NAF, RAQ, LJS, WPT, TPT, & GYY:  United States

      (d)   Title of Class of Securities:

                  Common Stock

      (e)   CUSIP Number: 346375 10 8

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

Not applicable

Item 4. Ownership

See Rows 5 through 11 of cover pages

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 |X|. On January 22,
2004, IVP and IVM distributed  additional  shares to their beneficial owners and
thereafter  all  reporting  persons own less than five percent of the  company's
stock.

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

Under  certain  circumstances  set  forth in IVP and IVM's  Limited  Partnership
Agreements, the General Partners and Limited Partners of each of such funds have
the right to  receive  dividends  from,  or the  proceeds  from the sale of, the
Common Stock of Issuer owned by each such fund.


CUSIP No. 346375 10 8                                        Page 15 of 17 Pages
--------------------------------------------------------------------------------

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

By signing below I certify  that,  to the best of my knowledge  and belief,  the
securities  referred to above were not acquired and are not held for the purpose
of or with the effect of  changing or  influencing  the control of the issuer of
the securities and were not acquired and are not held in connection with or as a
participant in any transaction having that purpose or effect.

EXHIBITS

A: Joint Filing Statement


CUSIP No. 346375 10 8                                        Page 16 of 17 Pages
--------------------------------------------------------------------------------

                                    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 11, 2004

INSTITUTIONAL VENTURE PARTNERS VII, L.P.
By its General Partner, Institutional Venture Management VII, L.P.

INSTITUTIONAL VENTURE MANAGEMENT VII, L.P.

IVP FOUNDERS FUND I, L.P.
By its General Partner, Institutional Venture Management VI, L.P.


----------------------------------------------------
T. Peter Thomas, General Partner


-------------------------------------
T. Peter Thomas


Samuel D. Colella
Reid W. Dennis
Mary Jane Elmore
Norman A. Fogelsong
Ruthann Quindlen
L. James Strand
William P. Tai
Geoffrey Y. Yang


-------------------------------------
Nancy E. McCroskey, Authorized Signer


CUSIP No. 346375 10 8                                        Page 17 of 17 Pages
--------------------------------------------------------------------------------

                                    EXHIBIT A

                             JOINT FILING STATEMENT

      Pursuant  to Rule  13d-1(k(1),  we, the  undersigned,  hereby  express our
agreement that the attached Schedule 13G is filed on behalf of each of us.

Date: February 11, 2004

INSTITUTIONAL VENTURE PARTNERS VII, L.P.
By its General Partner, Institutional Venture Management VII, L.P.

INSTITUTIONAL VENTURE MANAGEMENT VII, L.P.

IVP FOUNDERS FUND I, L.P.
By its General Partner, Institutional Venture Management VI, L.P.


----------------------------------------------------
T. Peter Thomas, General Partner


-------------------------------------
T. Peter Thomas


Samuel D. Colella
Reid W. Dennis
Mary Jane Elmore
Norman A. Fogelsong
Ruthann Quindlen
L. James Strand
William P. Tai
Geoffrey Y. Yang


-------------------------------------
Nancy E. McCroskey, Authorized Signer