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                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                        ----------------------------------------
                                                       OMB APPROVAL
                                        ----------------------------------------
                                        OMB NUMBER                     3235-0145
                                        EXPIRES:               DECEMBER 31, 1997
                                        ESTIMATED AVERAGE BURDEN 
                                        HOURS PER FORM.....................14.90
                                        ----------------------------------------


                                  SCHEDULE 13G


                   Under the Securities Exchange Act of 1934
                            (Amendment No. _______)*
 
                       PIA Merchandising Services, Inc.
- ------------------------------------------------------------------------------- 
                               (Name of Issuer)
 
                         COMMON STOCK, $.01 par value
- ------------------------------------------------------------------------------- 
                        (Title of Class of Securities)
 
                                  693360 10 9
                 --------------------------------------------
                                (CUSIP Number)
 
 
 
 
 
Check the following box if a fee is being paid with the statement [_]. (A fee is
not required only if the reporting person: (1) has a previous statement on file
reporting beneficial ownership of more than five percent of the class of
securities described in Item 1; and (2) has filed no amendment subsequent
thereto reporting beneficial ownership of five percent or less of such class.)
(See Rule 13d-7.)

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

                               Page 1 of 12 pages

 
- -----------------------                                  ---------------------
 CUSIP NO. 693360 10 9            SCHEDULE 13G             PAGE 2 OF 12 PAGES
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

      RVM/PIA, a California limited partnership
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [X]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

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

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5   
     NUMBER OF            -0-
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6
                          1,637,151
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7    
    REPORTING             -0-
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8
                          1,637,151
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9  
      1,637,151

- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10                                                                         [_]
 
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
11    
      27.8%

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

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

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!

                               Page 2 of 12 pages

 
- -----------------------                                  ---------------------
 CUSIP NO. 693360 10 9            SCHEDULE 13G             PAGE 3 OF 12 PAGES
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

      Riordan, Lewis & Haden
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [X]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

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

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5   
     NUMBER OF            -0-
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6
                          1,637,151
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7    
    REPORTING             -0-
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8
                          1,637,151
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9  
      1,637,151

- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10                                                                         [_]
 
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
11    
      27.8%

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

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

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!

                               Page 3 of 12 pages

 
- -----------------------                                  ---------------------
 CUSIP NO. 693360 10 9            SCHEDULE 13G             PAGE 4 OF 12 PAGES
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

      J. Christopher Lewis
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [X]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

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

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5   
     NUMBER OF            2,500
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6
                          1,637,151
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7    
    REPORTING             2,500
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8
                          1,637,151
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9  
      1,639,651

- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10                                                                         [_]
 
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
11    
      27.8%

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

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

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!

                               Page 4 of 12 pages

 
- -----------------------                                  ---------------------
 CUSIP NO. 693360 10 9            SCHEDULE 13G             PAGE 5 OF 12 PAGES
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

      Patrick C. Haden
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [X]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

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

- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5   
     NUMBER OF            2,500
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6
                          1,637,151
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7    
    REPORTING             2,500
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8
                          1,637,151
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9  
      1,639,651

- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10                                                                         [_]
 
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
11    
      27.8%

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

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

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!

                               Page 5 of 12 pages

 
ITEM 1.

  (a)  NAME OF ISSUER

       PIA Merchandising Services, Inc.

  (b)  ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES

       19900 MacArthur Boulevard, Suite 900
       Newport Beach, California  92718
 
ITEM 2.

  (a)  NAME OF PERSON FILING

       The persons filing this Schedule 13G are RVM/PIA, a California limited
       partnership, Riordan, Lewis & Haden, J. Christopher Lewis and Patrick C.
       Haden (collectively, the "Filing Persons").

  (b)  ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE

       19900 MacArthur Boulevard, Suite 900
       Newport Beach, California  92718

  (c)  CITIZENSHIP

       The responses of the Filing Persons to Item 4 of the cover pages to this
       Schedule 13G that relate to the citizenships or places of organization of
       such persons are herein incorporated by reference.

  (d)  TITLE OF CLASS OF SECURITIES

       This filing is made in regard to Common Stock, $.01 par value per share,
       of PIA Merchandising Services, Inc. (the "Common Stock").
 
  (e)  CUSIP NUMBER
 
       693360 10 9

ITEM 3.  IF THIS STATEMENT IS FILED PURSUANT TO RULES 13D-1(B), OR 13D-2(B),
         CHECK WHETHER THE PERSON FILING IS A:
 
  (a)  [_]   Broker or Dealer registered under Section 15 of the Act,
 
  (b)  [_]   Bank as defined in Section 3(a)(6) of the Act,
 
  (c)  [_]   Insurance Company as defined in Section 3(a)(19) of the Act,
 
  (d)  [_]   Investment Company registered under Section 8 of the Investment
             Company Act,
 
  (e)  [_]   Investment Adviser registered under Section 203 of the Investment
             Advisers Act of 1940,
  

                               Page 6 of 12 pages

 
  (f)  [_]   Employee Benefit Plan, Pension Fund which is subject to the
             provisions of the Employee Retirement Income Security Act of 1974
             or Endowment Fund; see 13d-1(b)(1)(ii)(F), 
 
  (g)  [_]   Parent Holding Company, in accordance with Rule 13d-1(b)(ii)(G);
             see Item 7,
 
  (h)  [_]   Group, in accordance with Rule 13d-1(b)(1)(ii)(H).

ITEM 4.  OWNERSHIP

  (a)  AMOUNT BENEFICIALLY OWNED:

       The responses of the Filing Persons to Item 9 of the cover pages that
       relate to the aggregate amount beneficially owned by each Filing Person
       are herein incorporated by reference.

  (b)  PERCENT OF CLASS:

       The percentage of Common Stock beneficially owned by the Filing Persons
       is 27.8%

  (c)  NUMBER OF SHARES AS TO WHICH SUCH PERSON HAS:

       The responses of the Filing Persons to Items 5 through 8 of the cover
       pages that relate to the number of shares beneficially owned by each
       Filing Person are herein incorporated by reference.

       (i) SOLE POWER TO VOTE OR TO DIRECT THE VOTE:

       (ii) SHARED POWER TO VOTE OR TO DIRECT THE VOTE:

       (iii) SOLE POWER TO DISPOSE OR TO DIRECT THE DISPOSITION OF:

       (iv) SHARED POWER TO DISPOSE OR TO DIRECT THE DISPOSITION OF:

ITEM 5.  OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS

  Not Applicable.

ITEM 6.  OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON

  Not Applicable.

ITEM 7.  IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED THE
         SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY

  Not Applicable.

                               Page 7 of 12 pages

 
ITEM 8.  IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP

  The Filing Persons have filed this Schedule 13G as a group pursuant to Rule
  13d-1(f). The identity of each member of the group is stated in Exhibit 1
  attached hereto. The Filing Persons entered into a Joint Reporting Agreement
  dated February 13, 1997, pursuant to which they agreed to file one joint
  statement on behalf of all of them with respect to the subject matter of this
  Schedule 13G.

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 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 purposes or effect.

                               Page 8 of 12 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.

Dated:  February 13, 1997

                              RVM/PIA,
                              a California limited partnership

                              By:  Riordan Lewis & Haden
                                   Its:  General Partner


                                   By:    /s/ J. Christopher Lewis
                                       ---------------------------------------
                                       J. Christopher Lewis
                                       General Partner

                                 /s/ J. Christopher Lewis
                              ------------------------------------------------
                                   J. Christopher Lewis



                                 /s/ Patrick C. Haden
                              ------------------------------------------------
                                   Patrick C. Haden

                               Page 9 of 12 pages

 
                                 EXHIBIT INDEX
                                 -------------


Sequentially Exhibit Numbered Number Description Page - ------- ----------- ------------ 1 Identification of Members of the Group . . . . . . . . . . . . . . . . . . . . 1 2 Joint Reporting Agreement dated February 13, 1997. . . . . . . . . . . . . . . 2
Page 10 of 12 pages EXHIBIT 1 Identification of Members of the Group 1. RVM/PIA, a California limited partnership 2. Riordan, Lewis & Haden 3. J. Christopher Lewis 4. Patrick C. Haden Page 11 of 12 pages EXHIBIT 2 Joint Reporting Agreement ------------------------- In consideration of the mutual covenants herein contained, each of the parties hereto represents to and agrees with the other party as follows: 1. Such party is eligible to file a statement or statements on Schedule 13G pertaining to the Common Stock, no par value, of Data Processing Resources Corporation, to which this agreement is an exhibit, for filing of the information contained herein. 2. Such party is responsible for timely filing of such statement and any amendments thereto and for the completeness and accuracy of the information concerning such party contained therein, provided that no such party is responsible for the completeness or accuracy of the information concerning any other party making the filing, unless such party knows or has reason to believe that such information is inaccurate. 3. Such party agrees that such statement is filed by and on behalf of such party and that any amendment thereto will be filed on behalf of each such party. Dated: February 13, 1997 RVM/PIA, a California limited partnership By: Riordan Lewis & Haden Its: General Partner By: /s/ J. Christopher Lewis -------------------------------- J. Christopher Lewis General Partner /s/ J. Christopher Lewis -------------------------------------- J. Christopher Lewis /s/ Patrick C. Haden -------------------------------------- Patrick C. Haden Page 12 of 12 pages