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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. 1)

                               On Assignment, Inc.
- --------------------------------------------------------------------------------
                                (Name of Issuer)
                                  Common Stock
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)
                                    682159108
- --------------------------------------------------------------------------------
                                 (CUSIP Number)

                                December 31, 1999
- --------------------------------------------------------------------------------
             (Date of Event Which Requires Filing of this Statement)

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

           [ X ]  Rule 13d-1(b)

           [   ]  Rule 13d-1(c)

           [   ]  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 9 PAGES

<PAGE>

<TABLE>
<CAPTION>

                 <S>                                       <C>                                   <C>

- -----------------------------------------                                        --------------------------------------
CUSIP No.   682159108                                      13G                   Page  2  of  9  Pages
- -----------------------------------------                                        --------------------------------------

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

           John Hancock Mutual Life Insurance Company
           I.R.S. No. 04-1414660

- ---------- -------------------------------------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                      (a)  |_|
                                                                                  (b)  |_|
           N/A

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

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

           Commonwealth of Massachusetts

- ---------- -------------------------------------------------------------------------------------------------------------
                       5     SOLE VOTING POWER
    Number of
      Shares                 -0-

                    -------- -------------------------------------------------------------------------------------------
   Beneficially        6     SHARED VOTING POWER
     Owned by
       Each                  -0-

                    -------- -------------------------------------------------------------------------------------------
    Reporting          7     SOLE DISPOSITIVE POWER
      Person
       With                  -0-

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

                             -0-

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

           None, except through its indirect, wholly-owned subsidiary, John Hancock Advisers, Inc.

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

           N/A

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

           See line 9, above.

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

           IC, IA, HC

- ---------- -------------------------------------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
                                PAGE 2 OF 9 PAGES


<PAGE>



- -----------------------------------------                                        --------------------------------------
CUSIP No.   682159108                                      13G                   Page  3  of  9  Pages
- -----------------------------------------                                        --------------------------------------

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

           John Hancock Subsidiaries, Inc.
           I.R.S. No. 04-2687223

- ---------- -------------------------------------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                      (a)  |_|
                                                                                  (b)  |_|
           N/A

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

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

           Delaware

- ---------- -------------------------------------------------------------------------------------------------------------
                       5     SOLE VOTING POWER
    Number of
      Shares                 -0-

                    -------- -------------------------------------------------------------------------------------------
   Beneficially        6     SHARED VOTING POWER
     Owned by
       Each                  -0-

                    -------- -------------------------------------------------------------------------------------------
    Reporting          7     SOLE DISPOSITIVE POWER
      Person
       With                  -0-

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

                             -0-

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

           None, except through its indirect, wholly-owned subsidiary, John Hancock Advisers, Inc.

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

           N/A

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

           See line 9, above.

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

           HC

- ---------- -------------------------------------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
                                PAGE 3 OF 9 PAGES


<PAGE>


- -----------------------------------------                                        --------------------------------------
CUSIP No.   682159108                                      13G                   Page  4  of  9  Pages
- -----------------------------------------                                        --------------------------------------

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

           The Berkeley Financial Group, Inc.
           I.R.S. No. 04-3145626

- ---------- -------------------------------------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                      (a)  |_|
                                                                                  (b)  |_|
           N/A

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

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

           Delaware

- ---------- -------------------------------------------------------------------------------------------------------------
                       5     SOLE VOTING POWER
    Number of
      Shares                 -0-

                    -------- -------------------------------------------------------------------------------------------
   Beneficially        6     SHARED VOTING POWER
     Owned by
       Each                  -0-

                    -------- -------------------------------------------------------------------------------------------
    Reporting          7     SOLE DISPOSITIVE POWER
      Person
       With                  -0-

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

                             -0-

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

           None, except through its indirect, wholly-owned subsidiary, John Hancock Advisers, Inc.

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

           N/A

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

           See line 9, above.

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

           HC

- ---------- -------------------------------------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
                                PAGE 4 OF 9 PAGES


<PAGE>


- -----------------------------------------                                        --------------------------------------
CUSIP No.   682159108                                      13G                   Page  5  of  9  Pages
- -----------------------------------------                                        --------------------------------------

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

           John Hancock Advisers, Inc.
           I.R.S. No. 04-2441573

- ---------- -------------------------------------------------------------------------------------------------------------
    2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                      (a)  |_|
                                                                                  (b)  |_|
           N/A

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

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

           Delaware

- ---------- -------------------------------------------------------------------------------------------------------------
                       5     SOLE VOTING POWER
    Number of
      Shares                 194,965

                    -------- -------------------------------------------------------------------------------------------
   Beneficially        6     SHARED VOTING POWER
     Owned by
       Each                  -0-

                    -------- -------------------------------------------------------------------------------------------
    Reporting          7     SOLE DISPOSITIVE POWER
      Person
       With                  194,965

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

                             -0-

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

           194,965

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

           N/A

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

           1.8%

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

           IA

- ---------- -------------------------------------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
                                PAGE 5 OF 9 PAGES


<PAGE>


         The original statement shall be signed by each person on whose behalf
the statement is filed or his authorized representative. If the statement is
signed on behalf of a person by his authorized representative other than an
executive officer or general partner of the filing person, evidence of the
representative's authority to sign on behalf of such person shall be filed with
the statement, provided, however, that a power of attorney for this purpose
which is already on file with the Commission may be incorporated by reference.
The name and any title of each person who signs the statement shall be typed or
printed beneath his signature.

Note: Schedules filed in paper format shall include a signed original and five
copies of the schedule, including all exhibits. See Sec. 240.13d-7 for other
parties for whom copies are to be sent.

         Attention: Intentional misstatements or omissions of fact constitute
Federal criminal violations (See 18 U.S.C. 1001)

         Item 1(a)    Name of Issuer:
                      On Assignment, Inc.

         Item 1(b)    Address of Issuer's Principal Executive Offices:
                      26651 West Agoura Rd
                      Calabasas, CA  91302

         Item 2(a)    Name of Person Filing:
                      This filing is made on behalf of John Hancock  Mutual Life
                      Insurance Company ("JHMLICO"), JHMLICO's direct,
                      wholly-owned subsidiary, John Hancock Subsidiaries, Inc.
                      ("JHSI"),JHSI's direct,wholly-owned subsidiary, The
                      Berkeley Financial Group, Inc. ("TBFG") and TBFG's
                      wholly-owned subsidiary, John Hancock Advisers, Inc.
                      ("JHA").

         Item 2(b)    Address of the Principal Offices:
                      The principal business offices of JHMLICO and JHSI are
                      located at John Hancock Place, P.O. Box 111, Boston, MA
                      02117. The principal business offices of TBFG and JHA are
                      located at 101 Huntington Avenue, Boston, Massachusetts
                      02199.

         Item 2(c)    Citizenship:
                      JHMLICO was organized and exists under the laws of the
                      Commonwealth of Massachusetts. JHSI, TBFG and JHA were
                      organized and exist under the laws of the State of
                      Delaware.

         Item 2(d)    Title of Class of Securities:
                      Common Stock

         Item 2(e)    CUSIP Number:
                      682159108

         Item 3       If the Statement is being filed pursuant to Rule
                      13d-1(b), or 13d-2(b), check whether the person filing is
                      a:

                      JHMLICO:      (c) (X) Insurance Company as defined in
                                            ss.3(a)(19) of the Act.

                                    (e) (X) Investment Adviser registered
                                            under ss.203 of the Investment
                                            Advisers Act of 1940.

                                    (g) (X) Parent Holding Company, in
                                            accordance with ss.240.13d-1(b)
                                            (ii)(G).

                      JHSI:         (g) (X) Parent Holding Company, in
                                            accordance with ss.240.13d-1(b)
                                            (ii)(G).

                      TBFG:         (g) (X) Parent Holding Company, in
                                            accordance with ss.240.13d-1(b)
                                            (ii)(G).

                      JHA:          (e) (X) Investment Adviser registered under
                                            ss.203 of the Investment Advisers
                                            Act of 1940.

                                PAGE 6 OF 9 PAGES
<PAGE>



         Item 4       Ownership:

                      (a)  Amount Beneficially Owned: JHA has direct beneficial
                           ownership of 194,965 shares of Common Stock.  Through
                           their parent-subsidiary relationship to JHA, JHMLICO,
                           JHSI and TBFG have indirect, beneficial ownership of
                           these same shares.

                      (b)  Percent of Class: 1.8%

                      (c) (i)   sole power to vote or to direct the vote:
                                JHA has sole power to vote or to direct the
                                vote of 194,965 shares of Common Stock under
                                the Advisory Agreements as follows:
                                                                                                      Date of
                                                                                    Number            Advisory
                                Fund Name                                           of Shares         Agreement
                                ---------                                           ---------         ---------
                                John Hancock Small Cap - Pension                    13,400            November 1, 1998
                                John Hancock V.A. Small Cap Growth Fund             2,900             August 29, 1996
                                John Hancock Small Capitalization Growth Fund       700               December 11, 1995
                                John Hancock Small Cap Growth Fund                  135,900           December 2, 1996
                                John Hancock Variable Series Trust I - Small Cap    27,700            March 29, 1996
                                Growth Portfolio
                                Indosuez North America Smaller Companies            3,665             March 15, 1999
                                Portfolio
                                Maritime Life Discovery Fund                        10,700            May 11, 1994

                          (ii)  shared power to vote or to direct the vote:  -0-

                          (iii) sole power to dispose or to direct the disposition of:
                                JHA has sole  power to dispose or to direct
                                the disposition of 194,965 shares of Common
                                Stock under the Advisory Agreements noted in
                                Item 4(c)(i) above.

                          (iv)  shared power to dispose or to direct the
                                disposition of:  -0-

         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].

         Item 6       Ownership of More than Five Percent on Behalf of Another Person:
                      See Item 4.

         Item 7       Identification and Classification of the Subsidiary
                      which Acquired the Security Being Reported on by the
                      Parent Holding Company:
                      See Items 3 and 4 above.

         Item 8       Identification and Classification of Members of the Group:
                      Not applicable.

         Item 9       Notice of Dissolution of a Group:
                      Not applicable.

         Item 10      Certification:
                      By signing below the undersigned certifies that, to the
                      best of its knowledge and belief, the securities referred
                      to above were acquired in the ordinary course of business
                      and were not acquired for the purpose of and do not have
                      the effect of changing or influencing the control of the
                      issuer of such securities and were not acquired in
                      connection with or as a participant in any transaction
                      having such purpose or effect.
</TABLE>


                                PAGE 7 OF 9 PAGES


<PAGE>



                                    SIGNATURE

         After reasonable inquiry and to the best of its knowledge and belief,
each of the undersigned certifies that the information set forth in this
statement is true, complete and correct.


                                   John Hancock Mutual Life Insurance Company

                                   By:      /s/Gregory P. Winn
                                            -----------------------------------
                                   Name:    Gregory P. Winn
Dated: January 14, 2000            Title:   Vice President and Treasurer

                                   John Hancock Subsidiaries, Inc.

                                   By:      /s/Gregory P. Winn
                                            -----------------------------------
                                   Name:    Gregory P. Winn
Dated: January 14, 2000            Title:   Treasurer


                                   The Berkeley Financial Group, Inc.

                                   By:      /s/Susan S. Newton
                                            -----------------------------------
                                   Name:    Susan S. Newton
Dated: January 14, 2000            Title:   Vice President


                                   John Hancock Advisers, Inc.

                                   By:      /s/Susan S. Newton
                                            -----------------------------------
                                   Name:    Susan S. Newton
Dated: January 14, 2000            Title:   Vice President





                                PAGE 8 OF 9 PAGES
<PAGE>



EXHIBIT A
                             JOINT FILING AGREEMENT

         John Hancock Mutual Life Insurance Company, John Hancock Subsidiaries,
Inc., The Berkeley Financial Group and John Hancock Advisers, Inc. agree that
the Terminated Schedule 13G (Amendment No. 1) to which this Agreement is
attached, relating to the Common Stock of On Assignment, Inc. is filed on behalf
of each of them.


                                    John Hancock Mutual Life Insurance Company

                                    By:      /s/Gregory P. Winn
                                             ----------------------------------
                                    Name:    Gregory P. Winn
Dated: January 14, 2000             Title:   Vice President and Treasurer

                                    John Hancock Subsidiaries, Inc.

                                    By:      /s/Gregory P. Winn
                                             ----------------------------------
                                    Name:    Gregory P. Winn
Dated: January 14, 2000             Title:   Treasurer


                                    The Berkeley Financial Group, Inc.

                                    By:      /s/Susan S. Newton
                                             ----------------------------------
                                    Name:    Susan S. Newton
Dated: January 14, 2000             Title:   Vice President


                                    John Hancock Advisers, Inc.

                                    By:      /s/Susan S. Newton
                                             ----------------------------------
                                    Name:    Susan S. Newton
Dated: January 14, 2000             Title:   Vice President






                                PAGE 9 OF 9 PAGES




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