UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                                   FORM 10-K/A
                                (AMENDMENT NO. 1)
(Mark One)

   [X]      ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
            EXCHANGE ACT OF 1934

                   For the fiscal year ended December 31, 1999

                                       OR

   [ ]      TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
            EXHANGE ACT OF 1934

                   For the transition period from ___ to ____

                         Commission file number 0-21529


                          GIGA INFORMATION GROUP, INC.
             (Exact name of Registrant as specified in its charter)


            Delaware                                           06-1422860
(State or other jurisdiction of                             (I.R.S. Employer
 incorporation or organization)                            Identification No.)

                              139 Main Street 02142
                       Cambridge, Massachusetts (Zip Code)
                     (Address of principal executive offices)

       Registrant's telephone number, including area code: (617) 949-4900

        Securities registered pursuant to Section 12(b) of the Act: None

           Securities registered pursuant to Section 12(g) of the Act:
                          Common Stock; $.001 par value

   Indicate by check mark whether the registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to such
filing requirement for the past 90 days. Yes [X]  No [ ]

   Indicate by check mark if disclosure of delinquent filers pursuant to Item
405 of Regulation S-K is not contained herein, and will not be contained, to the
best of registrant's knowledge, in definite proxy or information statements
incorporated by reference in Part III of this Form 10-K or any amendment to this
Form 10-K. [ ]

   The aggregate market value of the voting stock held by non-affiliates of the
registrant as of March 16, 2000 was $47,337,537. This number was calculated by
excluding all shares held by executive officers and directors of the registrant
and each person who owns more than 10% or more of the outstanding Common Stock
without conceding that all such persons are "affiliates" of the registrant for
purposes of the Federal securities laws.

   The number of shares outstanding of the registrant's capital stock as of
March 16, 2000 was 10,143,607 shares of Common Stock, par value $.001 per share.

DOCUMENTS INCORPORATED BY REFERENCE

(1) Proxy Statement for the Annual Meeting of Stockholders of the Registrant to
be held on May 25, 2000. Certain information therein is incorporated by
reference into Part III hereof.



47954.0001
<PAGE>
                                EXPLANATORY NOTE


This Amendment No. 1 on Form 10-K/A to the Annual Report on Form 10-K of Giga
Information Group, Inc., amends and restates in its entirety Item 14 of Part IV
solely to add Exhibit 10.20.

                                     PART IV

Item 14.  Exhibits, Financial Statement Schedules and Reports on Form 8-K.

(a)        1.    Financial Statements

                     The information required by this item appears beginning on
           page F-1 of this Annual Report on Form 10-K and is incorporated
           herein by reference.

           2.    Financial Statement Schedule

                     The Financial Statement schedules required to be filed
           hereunder appear on page S-1 hereof.

                     Other schedules are omitted because of the absence of
           conditions under which they are required or because the required
           information is given in the consolidated financial statements or
           notes thereto.

3.         Exhibits

           Exhibit
           Number          Description of Documents
           ------          ------------------------

           3.1 (1)         Fifth Amended and Restated Certificate of
                           Incorporation of the Registrant

           3.2 (1)         Amended and Restated By-Laws of the Registrant

           4 (1)           Specimen Certificate for shares of Common Stock,
                           $.001 par value, of the Registrant

           10.1 (1)        Registration Rights Agreement dated November 13,
                           1995, as amended, among the Registrant, the Investors
                           named on Exhibit A thereto, Gideon I. Gartner and
                           David L. Gilmour

           10.2 (1)        Co-Sale and Stock Restriction Agreement dated
                           November 13, 1995, as amended, among the Registrant,
                           Gideon I. Gartner and the stockholders named on the
                           signature pages thereto

           10.3 (5)        Employment Agreement dated December 24, 1998 between
                           the Registrant and Gideon I. Gartner

           10.4(5)         Consulting Agreement dated December 18, 1998 between
                           the Registrant and Richard L. Crandall

           10.5 (1)        Consulting Agreement dated February 1, 1998 between
                           the Registrant and David Gilmour

           10.6 (1)        Non-competition Agreement dated November 13, 1995
                           between the Registrant and Gideon I. Gartner

           10.7 (1)        Lease dated October 31, 1995 between the Registrant
                           and Cambridge 1400 Limited Partnership, with respect
                           to the premises at One Kendall Square

           10.8 (1)        (a) Lease dated October 6, 1987, as amended, between
                           BIS Strategic Decisions, Inc. and Charles A. Pesko,
                           Jr. as Trustee of Longwater Circle Trust, with
                           respect to the premises at One Longwater Circle (b)
                           Lease dated May 29, 1998, between the Registrant and
                           Trinet Property Partners, L.P., with respect to the
                           premises at One Longwater Circle

           10.9 (2)        1995 Stock Option/Stock Issuance Plan



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<PAGE>
           Exhibit
           Number          Description of Documents (continued)
           ------          ------------------------------------

           10.10 (3)       1996 Stock Option Plan

           10.11 (4)       1997 Director Option Plan

           10.12 (6)       Employment Agreement, dated May 13, 1999, between
                           Giga Information Group, Inc. and Robert K. Weiler

           10.13 (12)      Letter Agreement effective as of October 26, 1999
                           between the Registrant and Robert K. Weiler providing
                           for the deferral of year 2000 compensation

           10.14 (7)       Giga Information Group, Inc. 1999 Share Incentive
                           Plan

           10.15 (8)       Giga Information Group, Inc. 1999 Employee Stock
                           Purchase Plan

           10.16 (9)       Lease dated June 18, 1999 between the Registrant and
                           The Linden Limited Partnership with respect to its
                           headquarters at 139 Main St., Cambridge,
                           Massachusetts

           10.17 (9)       Sublease dated June 28, 1999 between the Registrant
                           and InCert Software Corporation with respect to the
                           premises at One Kendall Square, Cambridge,
                           Massachusetts

           10.18 (10)      Consulting Agreement dated as of August 23, 1999
                           between the Registrant and John Landry

           10.19 (11)      Rights Agreement dated as of February 18, 2000
                           between Giga Information Group, Inc. and American
                           Stock Transfer & Trust Co., as Rights Agent. The
                           Rights Agreement includes as Exhibit B the form of
                           Right Certificate and as Exhibit C the form of
                           Certificate of Designations

           10.20*          Separation Agreement, effective as of August 15, 1999
                           between the Registrant and James C. R. Graham

           11 (12)         Statement re computation of earnings per share

           21(1)           Subsidiaries of the Registrant

           23 *            Consent of PricewaterhouseCoopers LLP

           27 (12)         Financial Data Schedule


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

           *          Filed herewith

           (1)        Incorporated by reference to the Registrant's Registration
                      Statement on Form S-1 (File No. 333-52899), dated July 28,
                      1998.

           (2)        Incorporated by reference to the Registrant's Registration
                      Statement on Form S-8 (File No. 333-64411), dated
                      September 28, 1998.

           (3)        Incorporated by reference to the Registrant's Registration
                      Statement on Form S-8 (File No. 333-64409), dated
                      September 28, 1998.

           (4)        Incorporated by reference to the Registrant's Registration
                      Statement on Form S-8 (File No. 333-64413), dated
                      September 28, 1998.

           (5)        Incorporated by reference to the Registrant's Annual
                      Report on Form 10-K for the fiscal year ended December 31,
                      1998.

           (6)        Incorporated by reference to the Registrant's Current
                      Report on Form 8-K, dated May 17, 1999.

           (7)        Incorporated by reference to Annex A to Giga's Proxy
                      Statement for its 1999 Annual Meeting of Stockholders,
                      dated April 12, 1999.

           (8)        Incorporated by reference to Annex B to Giga's Proxy
                      Statement for its 1999 Annual Meeting of Stockholders,
                      dated April 12, 1999.

           (9)        Incorporated by reference to the Registrant's Quarterly
                      Report on Form 10-Q for the fiscal quarter ended June 30,
                      1999.

           (10)       Incorporated by reference to the Registrant's Quarterly
                      Report on Form 10-Q for the fiscal quarter ended September
                      30, 1999.

           (11)       Incorporated by reference to the Registrant's Current
                      Report on Form 8-K, dated February 18, 2000.

           (12)       Incorporated by reference to the Registrant's Annual
                      Report on Form 10-K for the fiscal year ended December 31,
                      1999


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<PAGE>
(b)        Reports on Form 8-K

           Giga filed a Current Report on Form 8-K, dated October 29, 1999,
pertaining to a press release announcing Giga's results of operations for the
three and nine months ended September 30, 1999.

















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<PAGE>
                                   SIGNATURES

  Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange
Act of 1934, the Registrant has duly caused this report to be signed on its
behalf by the undersigned, thereunto duly authorized on the 2nd day of May,
2000.

                                       GIGA INFORMATION GROUP, INC.

                                       By: ROBERT K. WEILER
                                           -------------------------------------
                                           Robert K.Weiler
                                           Chairman of the Board of Directors,
                                           President and Chief Executive Officer

















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