EXHIBIT 3.1

                              AMENDED AND RESTATED
                          CERTIFICATE OF INCORPORATION

                                       OF

                          GIGA INFORMATION GROUP, INC.

                        Pursuant to Sections 242 and 245
                         of the General Corporation Law
                            of the State of Delaware


            GIGA INFORMATION GROUP, INC. (the "Corporation"), a corporation
organized and existing under and by virtue of the General Corporation Law of the
State of Delaware (the "General Corporation Law"), hereby certifies as follows:

            1. The name of the corporation is Giga Information Group, Inc. Giga
Information Group, Inc., was originally incorporated under the name Giga
Strategic Decisions, Inc., and the original Certificate of Incorporation was
filed with the Secretary of State of Delaware on March 17, 1995.

            2. This Restated Certificate of Incorporation restates and
integrates and further amends the Amended and Restated Certificate of
Incorporation of the Corporation, was duly adopted in accordance with the
provisions of Sections 242 and 245 of the General Corporation Law, and was
approved by written consent of the stockholders of the Corporation given in
accordance with the provisions of Section 228 of the General Corporation Law
(prompt notice of such action having been given to those stockholders who did
not consent in writing). The resolution setting forth the Restated Certificate
of Incorporation is as follows:

            RESOLVED: That the Amended and Restated Certificate of Incorporation
of the Corporation, as amended, be and hereby is amended and restated in its
entirety so that the same shall read as follows:

            FIRST. The name of this Corporation is:

            Giga Information Group, Inc.

            SECOND. The address of the Corporation's registered office in the
State of Delaware is National Corporate Research, Ltd., 9 East Loockerman
Street, County




NYFS07...:\54\47954\0009\2041\EXH5018U.450
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of Kent, Dover 19901. The name of its registered agent at such address is
National Corporate Research, Ltd.

            THIRD. The nature of the business or purposes to be conducted or
promoted by the Corporation is as follows:

            To engage in any lawful act or activity for which corporations may
be organized under the General Corporation Law of Delaware.

            FOURTH. The total number of shares of all classes of stock which the
Corporation shall have authority to issue is 65,000,000 shares, consisting of
(i) 60,000,000 shares of Common Stock, $.001 par value per share ("Common
Stock"), and (ii) 5,000,000 shares of Preferred Stock, $.001 par value per share
("Preferred Stock").

            The following is a statement of the designations and the powers,
privileges and rights, and the qualifications, limitations or restrictions
thereof in respect of each class of capital stock of the Corporation.

            A.  COMMON STOCK.

            1. General. The voting, dividend and liquidation rights of the
holders of the Common Stock are subject to and qualified by the rights of the
holders of the Preferred Stock of any series as may be designated by the Board
of Directors upon any issuance of the Preferred Stock of any series.

            2. Voting. The holders of the Common Stock are entitled to one vote
for each share held at all meetings of stockholders (and written actions in lieu
of meetings). There shall be no cumulative voting.

            The number of authorized shares of Common Stock may be increased or
decreased (but not below the number of shares thereof then outstanding) by the
affirmative vote of the holders of a majority of the stock of the Corporation
entitled to vote, irrespective of the provisions of Section 242(b)(2) of the
General Corporation Law of Delaware.

            3. Dividends. Dividends may be declared and paid on the Common Stock
from funds lawfully available therefor as and when determined by the Board of
Directors and subject to any preferential dividend rights of any then
outstanding Preferred Stock.




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            4. Liquidation. Upon the dissolution or liquidation of the
Corporation, whether voluntary or involuntary, holders of Common Stock will be
entitled to receive all assets of the Corporation available for distribution to
its stockholders, subject to any preferential rights of any then outstanding
Preferred Stock.

            B.  PREFERRED STOCK.

            Preferred Stock may be issued from time to time in one or more
series, each of such series to have such terms as stated or expressed herein and
in the resolution or resolutions providing for the issue of such series adopted
by the Board of Directors of the Corporation as hereinafter provided. Any shares
of Preferred Stock which may be redeemed, purchased or acquired by the
Corporation may be reissued except as otherwise provided by law or this
Certificate of Incorporation. Different series of Preferred Stock shall not be
construed to constitute different classes of shares for the purposes of voting
by classes unless expressly provided.

            Authority is hereby expressly granted to the Board of Directors from
time to time to issue the Preferred Stock in one or more series, and in
connection with the creation of any such series, by resolution or resolutions
providing for the issue of the shares thereof, to determine and fix such voting
powers, full or limited, or no voting powers, and such designations, preferences
and relative participating, optional or other special rights, and
qualifications, limitations or restrictions thereof, including without
limitation thereof, dividend rights, conversion rights, redemption privileges
and liquidation preferences, as shall be stated and expressed in such
resolutions, all to the full extent now or hereafter permitted by the General
Corporation Law of Delaware. Without limiting the generality of the foregoing,
the resolutions providing for issuance of any series of Preferred Stock may
provide that such series shall be superior or rank equally or be junior to the
Preferred Stock of any other series to the extent permitted by law and this
Certificate of Incorporation. Except as otherwise provided in this Certificate
of Incorporation, no vote of the holders of the Preferred Stock or Common Stock
shall be a prerequisite to the designation or issuance of any shares of any
series of the Preferred Stock authorized by and complying with the conditions of
this Certificate of Incorporation, the right to have such vote being expressly



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waived by all present and future holders of the capital stock of the
Corporation.

            FIFTH. The Corporation shall have a perpetual existence.

            SIXTH. In furtherance of and not in limitation of powers conferred
by statute, it is further provided:

            1. Election of directors need not be by written ballot.

            2. The Board of Directors is expressly authorized to adopt, amend or
repeal the Bylaws of the Corporation.

            SEVENTH. Except to the extent that the General Corporation Law of
the State of Delaware prohibits the elimination or limitation of liability of
directors for breaches of fiduciary duty, no director of the Corporation shall
be personally liable to the Corporation or its stockholders for monetary damages
for any breach of fiduciary duty as a director, notwithstanding any provision of
law imposing such liability. No amendment to or repeal of this provision shall
apply to or have any effect on the liability or alleged liability of any
director of the Corporation for or with respect to any acts or omissions of such
director occurring prior to such amendment.

            EIGHTH. 1. Action, Suits and Proceedings Other than by or in the
Right of the Corporation. The Corporation shall indemnify each person who was or
is a party or is threatened to be made a party to any threatened, pending or
completed action, suit or proceeding, whether civil, criminal, administrative or
investigative (other than an action by or in the right of the Corporation), by
reason of the fact that he is or was, or has agreed to become, a director or
officer of the Corporation, or is or was serving, or has agreed to serve, at the
request of the Corporation, as a director, officer or trustee of, or in a
similar capacity with, another corporation, partnership, joint venture, trust or
other enterprise (including any employee benefit plan) (all such persons being
referred to hereafter as an "Indemnitee"), or by reason of any action alleged to
have been taken or omitted in such capacity, against all expenses (including
attorneys' fees) judgment, fines and amounts paid in settlement actually and
reasonably incurred by him or on his behalf in connection with such action, suit
or proceeding and any appeal therefrom, if he acted in good faith and in a
manner he reasonably believed



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to be in, or not opposed to, the best interests of the Corporation, and, with
respect to any criminal action or proceeding, had no reasonable cause to believe
his conduct was unlawful. The termination of any action, suit or proceeding by
judgment, order, settlement, conviction or upon a plea of nolo contendere or its
equivalent, shall not, of itself, create a presumption that the person did not
act in good faith and in a manner which he reasonably believed to be in, or not
opposed to, the best interests of the Corporation, and, with respect to any
criminal action or proceeding, had reasonable cause to believe that his conduct
was unlawful. Notwithstanding anything to the contrary in this Article, except
as set forth in Section 6 below, the Corporation shall not indemnify an
Indemnitee seeking indemnification in connection with a proceeding (or part
thereof) initiated by the Indemnitee unless the initiation thereof was approved
by the Board of Directors of the Corporation.

            2. Actions or Suits by or in the Right of the Corporation. The
Corporation shall indemnify any indemnitee who was or is a party or is
threatened to be made a party to any threatened, pending or completed action or
suit by or in the right of the Corporation to procure a judgment in its favor by
reason of the fact that he is or was, or has agreed to become, a director or
officer of the Corporation, or is or was serving, or has agreed to serve, at the
request of the Corporation, as a director, officer or trustee of, or in a
similar capacity with, another corporation, partnership, joint venture, trust or
other enterprise (including any employee benefit plan), or by reason of any
action alleged to have been taken or omitted in such capacity, against all
expenses (including attorneys' fees) and amounts paid in settlement actually and
reasonably incurred by him or on his behalf in connection with such action, suit
or proceeding and any appeal therefrom, if he acted in good faith and in a
manner he reasonably believed to be in, or not opposed to, the best interests of
the Corporation, except that no indemnification shall be made in respect of any
claim, issue or matter as to which such person shall have been adjudged to be
liable to the Corporation unless and only to the extent that the Court of
Chancery of Delaware or the court in which such action or suit was brought shall
determine upon application that, despite the adjudication of such liability but
in view of all the circumstances of the case, such person is fairly and
reasonably entitled to indemnity for such expenses (including attorneys' fees)
which the Court of Chancery of Delaware or such other court shall deem proper.



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            3. Indemnification for Expenses of Successful Party. Notwithstanding
the other provisions of this Article, to the extent that an Indemnitee has been
successful, on the merits or otherwise, in defense of any action, suit or
proceeding referred to in Sections 1 and 2 of this Article, or in defense of any
claim, issue or matter therein, or on appeal from any such action, suit or
proceeding, he shall be indemnified against all expenses (including attorneys'
fees) actually and reasonably incurred by him or on his behalf in connection
therewith. Without limiting the foregoing, if any action, suit or proceeding is
disposed of, on the merits or otherwise (including a disposition without
prejudice), without (i) the disposition being adverse to the Indemnitee, (ii) an
adjudication that the Indemnitee was liable to the Corporation, (iii) a plea of
guilty or nolo contendere by the Indemnitee, (iv) an adjudication that the
Indemnitee did not act in good faith and in a manner he reasonably believed to
be in or not opposed to the best interests of the Corporation, and (v) with
respect to any criminal proceeding, an adjudication that the Indemnitee had
reasonable cause to believe his conduct was unlawful, the Indemnitee shall be
considered for the purposes hereof to have been wholly successful with respect
thereto.

            4. Notification and Defense of Claim. As a condition precedent to
his right to be indemnified, the Indemnitee must notify the Corporation in
writing as soon as practicable of any action, suit, proceeding or investigation
involving him for which indemnity will or could be sought. With respect to any
action, suit, proceeding or investigation of which the Corporation is so
notified, the Corporation will be entitled to participate therein at its own
expense and/or to assume the defense thereof at its own expense, with legal
counsel reasonably acceptable to the Indemnitee. After notice from the
Corporation to the Indemnitee of its election so to assume such defense, the
Corporation shall not be liable to the Indemnitee for any legal or other
expenses subsequently incurred by the Indemnitee in connection with such claim,
other than as provided below in this Section 4. The Indemnitee shall have the
right to employ his own counsel in connection with such claim, but the fees and
expenses of such counsel incurred after notice from the Corporation of its
assumption of the defense thereof shall be at the expense of the Indemnitee
unless (i) the employment of counsel by the Indemnitee has been authorized by
the Corporation, (ii) counsel to the Indemnitee shall have reasonably concluded
that there may be a conflict of interest or position on any significant issue



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between the Corporation and the Indemnitee in the conduct of the defense of such
action or (iii) the Corporation shall not in fact have employed counsel to
assume the defense of such action, in each of which cases the fees and expenses
of counsel for the Indemnitee shall be at the expense of the Corporation, except
as otherwise expressly provided by this Article.

            The Corporation shall not be entitled, without the consent of the
Indemnitee, to assume the defense of any claim brought by or in the right of the
Corporation or as to which counsel for the Indemnitee shall have reasonably made
the conclusion provided for in clause (ii) above.

            5. Advance of Expenses. Subject to the provisions of Section 6
below, in the event that the Corporation does not assume the defense pursuant to
Section 4 of this Article of any action, suit, proceeding or investigation of
which the Corporation receives notice under this Article, any expenses
(including attorneys' fees) incurred by an Indemnitee in defending a civil or
criminal action, suit, proceeding or investigation or any appeal therefrom shall
be paid by the Corporation in advance of the final disposition of such matter;
provided, however, that the payment of such expense incurred by an Indemnitee in
advance of the final disposition of such matter shall be made only upon receipt
of an undertaking by or on behalf of the Indemnitee to repay all amounts so
advanced in the event that it shall ultimately be determined that the Indemnitee
is not entitled to be indemnified by the Corporation as authorized in this
Article. Such undertaking may be accepted without reference to the financial
ability of the Indemnitee to make such repayment.

            6. Procedure for Indemnification. In order to obtain indemnification
or advancement of expenses pursuant to Section 1, 2, 3 or 5 of this Article, the
Indemnitee shall submit to the Corporation a written request, including in such
request such documentation and information as is reasonably available to the
Indemnitee and is reasonably necessary to determine whether and to what extent
the Indemnitee is entitled to indemnification or advancement of expenses. Any
such indemnification or advancement of expenses shall be made promptly, and in
any event within 60 days after receipt by the Corporation of the written request
of the Indemnitee, unless with respect to requests under Section 1, 2 or 5 the
Corporation determines, by clear and convincing evidence, within such 60-day
period that the Indemnitee did not meet the applicable standard of conduct



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set forth in Section 1 or 2, as the case may be. Such determination shall be
made in each instance by (a) a majority vote of a quorum of the directors of the
Corporation consisting of persons who are not at that time parties to the
action, suit or proceeding in question ("disinterested directors"), (b) if no
such quorum is obtainable, a majority vote of a committee of two or more
disinterested directors, (c) a majority vote of a quorum of the outstanding
shares of stock of all classes entitled to vote for directors, voting as a
single class, which quorum shall consist of stockholders who are not at that
time parties to the action, suit or proceeding in question, (d) independent
legal counsel (who may be regular legal counsel to the Corporation), or (e) a
court of competent jurisdiction.

            7. Remedies. The right to indemnification or advances as granted by
this Article shall be enforceable by the Indemnitee in any court of competent
jurisdiction if the Corporation denies such request, in whole or in part, or if
no disposition thereof is made within the 60-day period referred to above in
Section 6. Unless otherwise provided by law, the burden of proving that the
Indemnitee is not entitled to indemnification or advance of expenses under this
Article shall be on the Corporation. Neither the failure of the Corporation to
have made a determination prior to the commencement of such action that
indemnification is proper in the circumstances because the Indemnitee has met
the applicable standard of conduct, nor an actual determination by the
Corporation pursuant to Section 6 that the Indemnitee has not met such
applicable standard of conduct, shall be a defense to the action or create a
presumption that the Indemnitee has not met the applicable standard of conduct.
The Indemnitee's expenses (including attorneys' fees) incurred in connection
with successfully establishing his right to indemnification, in whole or in
part, in any such proceeding shall also be indemnified by the Corporation.

            8. Subsequent Amendment. No amendment, termination or repeal of this
Article or of the relevant provisions of the General Corporation Law of Delaware
or any other applicable laws shall affect or diminish in any way the rights of
any Indemnitee to indemnification under the provisions hereof with respect to
any action, suit, proceeding or investigation arising out of or relating to any
actions, transactions or facts occurring prior to the final adoption of such
amendment, termination or repeal.




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            9. Other Rights. The indemnification and advancement of expenses
provided by this Article shall not be deemed exclusive of any other rights to
which an Indemnitee seeking indemnification or advancement of expenses may be
entitled under any law (common or statutory), agreement or vote of stockholders
or disinterested directors or otherwise, both as to action in his official
capacity and as to action in any other capacity while holding office for the
Corporation, and shall continue as to an Indemnitee who has ceased to be a
director or officer, and shall inure to the benefit of the estate, heirs,
executors and administrators of the Indemnitee. Nothing contained in this
Article shall be deemed to prohibit, and the Corporation is specifically
authorized to enter into, agreements with officers and directors providing
indemnification rights and procedures different from those set forth in this
Article. In addition, the Corporation may, to the extent authorized from time to
time by its Board of Directors, grant indemnification rights to other employees
or agents of the Corporation or other persons serving the Corporation and such
rights may be equivalent to, or greater or less than, those set forth in this
Article.

            10. Partial Indemnification. If an Indemnitee is entitled under any
provision of this Article to indemnification by the Corporation for some or a
portion of the expenses (including attorneys' fees), judgments, fines or amounts
paid in settlement actually and reasonably incurred by him or on his behalf in
connection with any action, suit, proceeding or investigation and any appeal,
therefrom but not, however, for the total amount thereof, the Corporation shall
nevertheless indemnify the Indemnitee for the portion of such expenses
(including attorneys' fees), judgments, fines or amounts paid in settlement to
which the Indemnitee is entitled.

            11. Insurance. The Corporation may purchase and maintain insurance,
at its expense, to protect itself and any director, officer, employee or agent
of the Corporation or another corporation, partnership, joint venture, trust or
other enterprise (including any employee benefit plan) against any expense,
liability or loss incurred by him in any such capacity, or arising out of his
status as such, whether or not the Corporation would have the power to indemnify
such person against such expense, liability or loss under the General
Corporation law of Delaware.




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            12. Merger or Consolidation. If the Corporation is merged into or
consolidated with another corporation and the Corporation is not the surviving
corporation, the surviving corporation shall assume the obligations of the
Corporation under this Article with respect to any action, suit, proceeding or
investigation arising out of or relating to any actions, transactions or facts
occurring prior to the date of such merger or consolidation.

            13. Savings Clause. If this Article or any portion hereof shall be
invalidated on any ground by any court of competent jurisdiction, then the
Corporation shall nevertheless indemnify each Indemnitee as to any expenses
(including attorneys' fees) judgments, fines and amounts paid in settlement in
connection with any action, suit, proceeding or investigation, whether civil,
criminal or administrative, including an action by or in the right of the
Corporation, to the fullest extent permitted by any applicable portion of this
Article that shall not have been invalidated and to the fullest extent permitted
by applicable law.

            14. Definitions. Terms used herein and defined in Section 145(h) and
Section 145(i) of the General Corporation Law of Delaware shall have the
respective meanings assigned to such terms in such Section 145(h) and Section
145(i).

            15. Subsequent Legislation. If the General Corporation Law of
Delaware is amended after adoption of this Article to expand further the
indemnification permitted to Indemnitees, then the Corporation shall indemnify
such persons to the fullest extent permitted by the General Corporation Law of
Delaware, as so amended.

            NINTH. The Corporation reserves the right to amend, alter, change or
repeal any provision contained in this Restated Certificate of Incorporation, in
the manner now or hereafter prescribed by statute and this Restated Certificate
of Incorporation, and all rights conferred upon stockholders herein are granted
subject to this reservation.

            TENTH. This Article is inserted for the management of the business
and for the conduct of the affairs of the Corporation.

            1. Number of Directors. The number of directors shall be fixed from
time to time by, or in the manner provided in, the Corporation's Bylaws.



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            2. Classes of Directors. The Board of Directors shall be and is
divided into three classes: Class I, Class II and Class III.

            3. Election of Directors. Elections of directors need not be by
written ballot except as and to the extent provided in the Bylaws of the
Corporation.

            4. Terms of Office. Each director shall serve for a term ending on
the date of the third annual meeting following the annual meeting at which such
director was elected and until his successor is duly elected and qualified;
provided, that each initial director in Class I shall serve for a term ending on
the date of the annual meeting of stockholders in 1999 and until his successor
is duly elected and qualified; each initial director in Class II shall serve for
a term ending on the date of the annual meeting of stockholders in 2000 and
until his successor is duly elected and qualified; and each initial director in
Class III shall serve for a term ending on the date of the annual meeting of
stockholders in 2001 and until his successor is duly elected and qualified; and
provided further, that the term of each director shall be subject to his earlier
death, resignation or removal.

            5. Allocation of Directors Among Classes in the Event of Increases
or Decreases in the Number of Directors. In the event of any increase or
decrease in the authorized number of directors, (i) each director then serving
as such shall nevertheless continue as a director of the class of which he is a
member and (ii) the newly created or eliminated directorships resulting from
such increase or decrease shall be apportioned by the Board of Directors among
the three classes of directors so as to ensure that no one class has more than
one director more than any other class. To the extent possible, consistent with
the foregoing rule, any newly created directorships shall be added to those
classes whose terms of office are to expire at the latest dates following such
allocation, and any newly eliminated directorships shall be subtracted from
those classes whose terms of offices are to expire at the earliest dates
following such allocation, unless otherwise provided from time to time by
resolution adopted by the Board of Directors.

            6. Quorum; Action at Meeting. A majority of the directors at any
time in office shall constitute a quorum for the transaction of business. In the
event one or more of the directors shall be disqualified to vote at any



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meeting, then the required quorum shall be reduced by one for each director so
disqualified, provided that in no case shall less than one-third of the number
of directors fixed pursuant to Section 1 above constitute a quorum. If at any
meeting of the Board of Directors there shall be less than such a quorum, a
majority of those present may adjourn the meeting from time to time. Every act
or decision done or made by a majority of the directors present at a meeting
duly held at which a quorum is present shall be regarded as the act of the Board
of Directors unless a greater number is required by law, by the Bylaws of the
Corporation or by this Restated Certificate of Incorporation.

            7. Removal. Directors of the Corporation may be removed only for
cause by the affirmative vote of the holders of at least two-thirds of the
shares of the capital stock of the Corporation issued and outstanding and
entitled to vote.

            8. Vacancies. Any vacancy in the Board of Directors, however
occurring, including a vacancy resulting from an enlargement of the board, shall
be filled only by a vote of a majority of the directors then in office, although
less than a quorum, or by a sole remaining director. A director elected to fill
a vacancy shall be elected to hold office until the next election of the class
for which such director shall have been chosen, subject to the election and
qualification of his successor and to his earlier death, resignation or removal.

            9. Stockholder Nominations and Introduction of Business, Etc.
Advance notice of stockholder nominations for election of directors and other
business to be brought by stockholders before a meeting of stockholders shall be
given in the manner provided by the Bylaws of the Corporation.

            10. Amendments to Article. Notwithstanding any other provisions of
law, this Restated Certificate of Incorporation or the Bylaws of the
Corporation, each as amended, and notwithstanding the fact that a lesser
percentage may be specified by law, the affirmative vote of the holders of at
least two-thirds of the shares of capital stock of the Corporation issued and
outstanding and entitled to vote shall be required to amend or repeal, or to
adopt any provision inconsistent with, this Article TENTH.

            ELEVENTH. Stockholders of the Corporation may not take any action by
written consent in lieu of a meeting.



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Notwithstanding any other provisions of law, the Restated Certificate of
Incorporation or the Bylaws of the Corporation, each as amended, and
notwithstanding the fact that a lesser percentage may be specified by law, the
affirmative vote of the holders of at least two-thirds of the shares of capital
stock of the Corporation issued and outstanding and entitled to vote shall be
required to amend or repeal, or to adopt any provision inconsistent with, this
Article ELEVENTH.

            TWELFTH. Special meetings of stockholders may be called at any time
by only the Chairman of the Board of Directors, the Chief Executive Officer (or
if there is no Chief Executive Officer, the President) or the Board of
Directors. Business transacted at any special meeting of stockholders shall be
limited to matters relating to the purpose or purposes stated in the notice of
meeting. Notwithstanding any other provision of law, this Restated Certificate
of Incorporation or the Bylaws of the Corporation, each as amended, and
notwithstanding the fact that a lesser percentage may be specified by law, the
affirmative vote of the holders of at least two-thirds of the shares of capital
stock of the Corporation issued and outstanding and entitled to vote shall be
required to amend or repeal, or to adopt any provision inconsistent with, this
Article TWELFTH.

            IN WITNESS WHEREOF, the Corporation has caused its corporate seal to
be affixed hereto and this Restated Certificate of Incorporation to be signed by
its President and Chief Operating Officer this 4th day August, 1998.



                              GIGA INFORMATION GROUP, INC.

                              By: /s/ GIDEON I. GARTNER                 
                                  ------------------------------------------
                                  Gideon I. Gartner
                                  President and Chief Operating Officer





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