ACORN INVESTMENT TRUST
SC 13G, 1997-02-14
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                                 UNITED STATES
                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549


                                 SCHEDULE 13G


                   Under the Securities Exchange Act of 1934

                             (Amendment _______)*
                                      No.
 
 
                         GIGA INFORMATION GROUP, INC.
- --------------------------------------------------------------------------------
                               (Name of Issuer)

                                PREFERRED STOCK
- --------------------------------------------------------------------------------
                        (Title of Class of Securities)

 
                                   375175999
                             --------------------
                                (CUSIP Number)


*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter the
disclosures provided in a prior cover page.

The information required 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).

                              Pages 1 of 5 pages
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- -----------------------                                  ---------------------
  CUSIP NO. 375175999                   13G                PAGE 2 OF 6 PAGES
- -----------------------                                  ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                          
          Acorn Investment Trust, Series Designated Acorn Fund 36-2962100
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
      Not Applicable                                            (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

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

        Massachusetts
- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5     
     NUMBER OF             None
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6    
                           885,714
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7     
    REPORTING              None
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8    
                           885,714
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9    
        885,714

- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10                  
        Not Applicable
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
11    
        5.30%

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

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

                     *SEE INSTRUCTION BEFORE FILLING OUT!

                               Page 2 of 5 pages
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Item 1(a)      Name of Issuer:

                    Giga Information Group Inc.

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

                    One Kendall Square
                    Building 1400W
                    Cambridge, Massachusetts 02139

Item 2(a)      Name of Person Filing:

                    Acorn Investment Trust, Series Designated Acorn Fund

Item 2(b)      Address of Principal Business Office:

                    227 West Monroe Street, Suite 3000
                    Chicago, Illinois 60606

Item 2(c)      Citizenship:
     
                    The filing person is a Massachusetts business trust.

Item 2(d)      Title of Class of Securities:

                    Preferred Stock

Item 2(e)      CUSIP Number:

                    375175999

Item 3         Type of Person:

                    (d)  Investment company registered under section 8 of the
                         Investment Company Act

Item 4         Ownership (at December 31, 1996):

                    (a)  Amount owned "beneficially" within the meaning of
                         rule 13d-3:

                         885,714 shares

                    (b)  Percent of class:

                         5.30%

                               Pages 3 of 5 pages
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                    (c)  Number of shares as to which such person has:
                              
                              (i)  sole power to vote or to direct the vote:
                                   none
                             (ii)  shared power to vote or to direct the vote:
                                   885,714
                            (iii)  sole power to dispose or to direct the
                                   disposition of: none
                             (iv)  shared power to dispose or to direct
                                   disposition of: 885,714

                    Power over voting and disposition of the securities is
                    shared with Wanger Asset Management, L.P. which is the
                    investment advisor of Acorn Investment Trust, Series
                    Designated Acorn Fund.

Item 5         Ownership of Five Percent or Less of a Class:

                    Not Applicable

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

                    Not Applicable

Item 7         Identification and Classification of the Subsidiary Which
               Acquired the Security Being Reported on by the Parent Holding
               Company:

                    Not Applicable

Item 8         Identification and Classification of Members of the Group:

                    Not Applicable

Item 9         Notice of Dissolution of Group:

                    Not Applicable

Item 10        Certification:

                    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 purpose or effect.

                               Pages 4 of 5 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, 1997


                                   ACORN INVESTMENT TRUST, SERIES DESIGNATED 
                                    ACORN FUND



                                   By: /s/ Bruce H. Lauer
                                       --------------------------------------
                                           Bruce H. Lauer
                                           Vice President and Secretary

                               Pages 5 of 5 pages


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