CCC Information Services Group Inc.
CCCISG Capital Trust
June 29, 2001
Page 1




                                                                     EXHIBIT 5.1



                       CCC INFORMATION SERVICES GROUP INC.
                           WORLD TRADE CENTER CHICAGO
                              444 MERCHANDISE MART
                             CHICAGO, ILLINOIS 60654


                                  June 29, 2001

CCC Information Services Group Inc.
CCCISG Capital Trust
World Trade Center Chicago
444 Merchandise Mart
Chicago, Illinois 60654

Ladies and Gentlemen:

         I am General Counsel and Secretary of CCC Information Services Group
Inc., a Delaware corporation (the "Company"). In connection with this
opinion, I or attorneys under my supervision have examined originals or
copies, certified or otherwise identified to my satisfaction, of the
Registration Statement on Form S-3 to which this opinion relates as filed
with the Securities and Exchange Commission (the "Commission") under the
Securities Act of 1933, as amended (the "Securities Act"), and any and all
amendments thereto, including post-effective amendments. The Registration
Statement relates to the issuance and sale from time to time, pursuant to
Rule 415 of the General Rules and Regulations promulgated under the
Securities Act, of the following securities of the Company with an aggregate
public offering price of up to $100,000,000: (i) senior or subordinated debt
securities of the Company, in one or more series (the "Debt Securities"),
which may be issued pursuant to the form of one or more indentures relating
to the debt securities (the "Indenture"), proposed to be entered into between
the Company and a trustee (the "Trustee"), filed as an exhibit to the
Registration Statement; (ii) shares of preferred stock, $1.00 par value per
share, of the Company (the "Preferred Stock"), in one or more series; (iii)
shares of common stock, $0.10 par value per share, of the Company ("Common
Stock"); (iv) warrants or other rights ("Warrants or Rights") to purchase
Debt Securities, Preferred Stock, Common Stock or other securities of the
Company as shall be designated by the Company at the time of offering issued
pursuant to one or more warrant agreements (each, a "Warrant or Rights
Agreement") proposed to be entered into between the Company and a warrant or
other applicable agent to be named (the "Warrant Agent"); (v) such
indeterminate amount of Debt Securities and number of shares of Preferred
Stock or Common Stock, as may be issued upon conversion, exchange or exercise
of any Debt Securities, Preferred



CCC Information Services Group Inc.
CCCISG Capital Trust
June 29, 2001
Page 2

Stock or Warrants or Rights, including such shares of Preferred Stock or
Common Stock as may be issued pursuant to anti-dilution adjustments, in
amounts, at prices and on terms to be determined at the time of offering (the
"Indeterminate Stock"); (vi) preferred securities (the "Preferred
Securities") of CCCISG Capital Trust, a statutory business trust formed under
the Business Trust Act of the State of Delaware (the "Trust"), which may be
issued pursuant to the form of Amended and Restated Declaration of Trust of
the Trust (the "Declaration"), the Declaration being among the Company, as
sponsor, a property trustee, a Delaware trustee, and Reid E. Simpson and
Robert Guttman, as administrative trustees, and filed as an exhibit to the
Registration Statement; and (vi) guarantees of the Company (the "Preferred
Securities Guarantees") of the Preferred Securities, which may be issued in
the form of a Preferred Securities Guarantee Agreement of the Trust (the
"Guarantee Agreement"), filed as an exhibit to the Registration Statement and
to be entered into by the Company and a trustee (the "Guarantee Trustee").
The Debt Securities, the Preferred Stock, the Common Stock, the Indeterminate
Stock, the Preferred Securities and the Preferred Securities Guarantees are
collectively referred to herein as the "Offered Securities."

         This opinion is being furnished in accordance with the requirements of
Item 601(b)(5) of Regulation S-K under the Securities Act.

         In connection with this opinion, I or attorneys under my supervision
have examined originals or copies, certified or otherwise identified to my
satisfaction, of (i) the form of Registration Statement relating to the Offered
Securities; (ii) the form of Indenture; (iii) the certificate of trust of the
Trust (the "Certificate of Trust") as filed with the Secretary of State of the
State of Delaware on June 14, 2001; (iv) the form of the Declaration of the
Trust (including the designation of the terms of the Preferred Securities
annexed thereto); (v) the form of the Preferred Securities of the Trust; (vi)
the form of Guarantee Agreement; (vii) the Amended and Restated Certificate of
Incorporation of the Company, as currently in effect (the "Certificate of
Incorporation"); (viii) the Second Amended and Restated By-laws of the Company,
as currently in effect (the "By-laws"); and (ix) certain resolutions adopted to
date by the Board of Directors of the Company (the "Board of Directors")
relating to the registration of Offered Securities. I or attorneys under my
supervision have also examined originals or copies, certified or otherwise
identified to our satisfaction, of such records of the Company and such
agreements, certificates of public officials, certificates of officers or other
representatives of the Company and others, and such other documents,
certificates and records as I have deemed necessary or appropriate as a basis
for the opinion set forth herein.

         In my examination, I have assumed the legal capacity of all natural
persons, the genuineness of all signatures, the authenticity of all documents
submitted to me as originals, the conformity to original documents of all
documents submitted to me as certified or photostatic copies and the
authenticity of the originals of such latter documents. In making my examination
of documents executed by parties other than the Company, I have assumed that
such parties had the power, corporate or other, to enter into and perform all
obligations thereunder and have also





CCC Information Services Group Inc.
CCCISG Capital Trust
June 29, 2001
Page 3

assumed the due authorization by all requisite action, corporate or other,
and execution and delivery by such parties of such documents and the validity
and binding effect thereof. As to any facts material to the opinions
expressed herein which I did not independently establish or verify, I have
relied upon oral or written statements and representations of officers and
other representatives of the Company and others. I have also assumed that the
Indentures will be duly authorized, executed and delivered by the Trustees
and that any Debt Securities that may be issued will be manually signed or
countersigned, as the case may be, by duly authorized officers of the
Trustee. I have also assumed that the Declaration of the Trust, the Preferred
Securities of the Trust and the Preferred Securities Guarantee of the Trust,
when executed, will be in substantially the form reviewed by me. In addition,
I have assumed that the terms of the Offered Debt Securities (as defined
below) and the Offered Preferred Securities (as defined below) will have been
established so as not to violate, conflict with or constitute a default under
(i) any agreement or instrument to which the Company or the Trust or their
respective properties is subject, (ii) any law, rule or regulation to which
the Company or the Trust is subject, (iii) any judicial or administrative
order or decree of any governmental authority or (iv) any consent, approval,
license, authorization or validation of, or filing, recording or registration
with, any governmental authority.

         I am admitted to the bar in the State of Illinois, and I do not express
any opinion as to the laws of any other jurisdiction other than the laws of the
United States of America to the extent referred to specifically herein. The
Offered Securities may be issued from time to time on a delayed or continuous
basis, and this opinion is limited to the laws, including the rules and
regulations, as in effect on the date hereof.

         1. With respect to any series of Debt Securities (the "Offered Debt
Securities"), when (i) the Registration Statement, as finally amended (including
all necessary post-effective amendments), has become effective under the
Securities Act and the applicable Indenture has been qualified under the Trust
Indenture Act of 1939, as amended; (ii) an appropriate prospectus supplement or
term sheet with respect to the Offered Debt Securities has been prepared,
delivered and filed in compliance with the Securities Act and the applicable
rules and regulations thereunder; (iii) if the Offered Debt Securities are to be
sold pursuant to a firm commitment underwritten offering, an underwriting
agreement with respect to the Offered Debt Securities has been duly authorized,
executed and delivered by the Company and the other parties thereto; (iv) the
Board of Directors, including any appropriate committee appointed thereby, and
appropriate officers of the Company have taken all necessary corporate action to
approve the issuance and terms of the Offered Debt Securities and related
matters; (v) the terms of the Offered Debt Securities and of their issuance and
sale have been duly established in conformity with the applicable Indenture so
as not to violate any applicable law, the Certificate of Incorporation or the
By-laws or result in a default under or breach of any agreement or instrument
binding upon the Company and so as to comply with any requirement or restriction
imposed by any court or governmental body having jurisdiction over the Company;
and (vi) the Offered Debt Securities have been duly executed and authenticated
in accordance with the provisions of the applicable




CCC Information Services Group Inc.
CCCISG Capital Trust
June 29, 2001
Page 4

Indenture and duly delivered to the purchasers thereof upon payment of the
agreed-upon consideration therefor, the Offered Debt Securities (including
any Debt Securities duly issued upon conversion, exchange or exercise of any
Debt Securities, Preferred Stock, Warrants or Rights), when issued and sold
in accordance with the applicable Indenture and the applicable underwriting
agreement, if any, or any other duly authorized, executed and delivered valid
and binding purchase or agency agreement, will be valid and binding
obligations of the Company, enforceable against the Company in accordance
with their respective terms, except to the extent that enforcement thereof
may be limited by (a) bankruptcy, insolvency, reorganization, fraudulent
conveyance, moratorium or other similar laws now or hereafter in effect
relating to creditors' rights generally, (b) general principles of equity
(regardless of whether enforceability is considered in a proceeding at law or
in equity), (c) public policy considerations which may limit the rights of
parties to obtain further remedies and (d) the waivers of any usury defense
contained in the Indentures which may be unenforceable.

         2. With respect to the shares of any series of Preferred Stock (the
"Offered Preferred Stock"), when (i) the Registration Statement, as finally
amended (including all necessary post-effective amendments), has become
effective under the Securities Act; (ii) an appropriate prospectus supplement or
term sheet with respect to the shares of the Offered Preferred Stock has been
prepared, delivered and filed in compliance with the Securities Act and the
applicable rules and regulations thereunder; (iii) if the Offered Preferred
Stock is to be sold pursuant to a firm commitment underwritten offering, an
underwriting agreement with respect to the shares of the Offered Preferred Stock
has been duly authorized, executed and delivered by the Company and the other
parties thereto; (iv) the Board of Directors, including any appropriate
committee appointed thereby, and appropriate officers of the Company have taken
all necessary corporate action to approve the issuance and terms of the shares
of the Offered Preferred Stock and related matters, including the adoption of a
Certificate of Designation for the Offered Preferred Stock in accordance with
the applicable provisions of Delaware law (the "Certificate of Designation");
(v) the filing of the Certificate of Designation with the Secretary of State of
the State of Delaware has duly occurred; (vi) the terms of the Offered Preferred
Stock and of their issuance and sale have been duly established in conformity
with the Certificate of Incorporation including the Certificate of Designation
relating to the Offered Preferred Stock and the By-laws so as not to violate any
applicable law, the Certificate of Incorporation or the Amended and the By-laws
of or result in a default under or breach of any agreement or instrument binding
upon the Company and so as to comply with any requirement or restriction imposed
by any court or governmental body having jurisdiction over the Company; and
(vii) certificates representing the shares of the Offered Preferred Stock are
duly executed, countersigned, registered and delivered upon payment of the
agreed-upon consideration therefor, the shares of the Offered Preferred Stock
(including any Preferred Stock duly issued upon conversion, exchange or exercise
of any Debt Securities, Preferred Stock, Warrants or Rights), when issued or
sold in accordance with the applicable underwriting agreement or any other duly
authorized, executed and delivered valid and binding purchase or agency
agreement, will be duly authorized, validly issued, fully paid and
nonassessable, provided that the consideration therefor is not less than the par
value thereof.




CCC Information Services Group Inc.
CCCISG Capital Trust
June 29, 2001
Page 5

         3. With respect to any offering of Common Stock (the "Offered Common
Stock"), when (i) the Registration Statement, as finally amended (including all
necessary post-effective amendments), has become effective under the Securities
Act; (ii) an appropriate prospectus supplement or term sheet with respect to the
Offered Common Stock has been prepared, delivered and filed in compliance with
the Securities Act and the applicable rules and regulations thereunder; (iii) if
the Offered Common Stock is to be sold pursuant to a firm commitment
underwritten offering, an underwriting agreement with respect to the Offered
Common Stock has been duly authorized, executed and delivered by the Company and
the other parties thereto; (iv) the Board of Directors, including any
appropriate committee appointed thereby, and appropriate officers of the Company
have taken all necessary corporate action to approve the issuance of the Offered
Common Stock and related matters; (v) the terms of the issuance and sale of the
Offered Common Stock have been duly established in conformity with the
Certificate of Incorporation and the By-laws so as not to violate any applicable
law, the Certificate of Incorporation or the By-laws of the Company or result in
a default under or breach of any agreement or instrument binding upon the
Company and so as to comply with any requirement or restriction imposed by any
court or governmental body having jurisdiction over the Company; and (vi)
certificates representing the shares of Offered Common Stock are duly executed,
countersigned, registered and delivered upon payment of the agreed upon
consideration therefor, the shares of Offered Common Stock (including any Common
Stock duly issued upon conversion, exchange or exercise of any Debt Securities,
Preferred Stock, Warrants or Rights), when issued and sold in accordance with
the applicable underwriting agreement with respect to the Offered Common Stock
or any other duly authorized, executed and delivered valid and binding purchase
or agency agreement, will be duly authorized, validly issued, fully paid and
nonassessable, provided that the consideration therefor is not less than the par
value thereof.

         4. With respect to any offering of Preferred Securities (the "Offered
Preferred Securities"), when (i) the Registration Statement, as finally amended
(including all necessary post-effective amendments), has become effective under
the Act; (ii) an appropriate prospectus with respect to the Offered Preferred
Securities has been prepared, delivered and filed in compliance with the Act and
the applicable rules and regulations thereunder; (iii) the Declaration of the
Trust has been duly executed and delivered by the parties thereto; (iv) the
terms of the Offered Preferred Securities have been established in accordance
with the Declaration; (v) the Offered Preferred Securities have been issued,
executed and authenticated in accordance with the Declaration and delivered and
paid for in the manner contemplated in the Registration Statement or any
prospectus relating thereto; and (vi) if the Offered Preferred Securities are to
be sold pursuant to a firm commitment underwritten offering, the underwriting
agreement with respect to the Offered Preferred Securities has been duly
authorized, executed and delivered by the Trust and the other parties thereto,
the Offered Preferred Securities will be duly authorized for issuance and will
be validly issued, fully paid and nonassessable, representing undivided
beneficial interests in the assets of the Trust and will entitle the holders
thereof to the benefits of the Declaration, except to the extent that
enforcement thereof may be limited by (i) bankruptcy,




CCC Information Services Group Inc.
CCCISG Capital Trust
June 29, 2001
Page 6

insolvency, reorganization, fraudulent conveyance, moratorium or other
similar laws now or hereafter in effect relating to creditors' rights
generally, (ii) general principles of equity (regardless of whether
enforceability is considered in a proceeding at law or in equity) and (c)
public policy considerations which may limit the rights of parties to obtain
further remedies.

         5. With respect to any offering of Preferred Securities Guarantees (the
"Offered Preferred Securities Guarantees"), when (i) the Registration Statement,
as finally amended (including all necessary post-effective amendments), has
become effective under the Securities Act and the Guarantee Agreement has been
qualified under the Trust Indenture Act of 1939, as amended; (ii) an appropriate
prospectus supplement or term sheet with respect to the Offered Preferred
Securities Guarantees has been prepared, delivered and filed in compliance with
the Securities Act and the applicable rules and regulations thereunder; (iii)
the Declaration of the Trust is duly executed and delivered by the parties
thereto; (iv) the terms of the Preferred Securities have been established in
accordance with the Declaration; (v) the Preferred Securities have been issued
and executed in accordance with the Declaration and paid for in the manner
contemplated in the Registration Statement or any prospectus relating thereto;
(vi) if the Preferred Securities are to be sold pursuant to a firm commitment
underwritten offering, an underwriting agreement with respect to the Offered
Preferred Securities Guarantees has been duly authorized, executed and delivered
by the Trust and the other parties thereto; (vii) the Board of Directors,
including any appropriate committee appointed thereby, and appropriate officers
of the Company have taken all necessary corporate action to approve the issuance
and terms of the Offered Preferred Securities Guarantees and related matters;
(viii) the terms of the Offered Preferred Securities Guarantees and of their
issuance and sale have been duly established in conformity with the Guarantee
Agreement so as not to violate any applicable law, the Certificate of
Incorporation or the By-laws or result in a default under or breach of any
agreement or instrument binding upon the Company and so as to comply with any
requirement or restriction imposed by any court or governmental body having
jurisdiction over the Company; and (ix) the Guarantee Agreement has been duly
executed and delivered by the Company and the Guarantee Trustee, the Offered
Preferred Securities Guarantees, when issued and sold in accordance with the
Guarantee Agreement and the applicable underwriting agreement, if any, or any
other duly authorized, executed and delivered valid and binding purchase or
agency agreement, will be valid and binding obligations of the Company,
enforceable against the Company in accordance with their respective terms,
except to the extent that enforcement thereof may be limited by (a) bankruptcy,
insolvency, reorganization, fraudulent conveyance, moratorium or other similar
laws now or hereafter in effect relating to creditors' rights generally, (b)
general principles of equity (regardless of whether enforceability is considered
in a proceeding at law or in equity) and (c) public policy considerations which
may limit the rights of the parties to obtain further remedies.

         6. With respect to any series of Warrants or Rights (the "Offered
Warrants or Rights"), when (i) the Registration Statement, as finally amended
(including all necessary post-effective amendments), has become effective under
the Securities Act; (ii) an appropriate prospectus supplement or term sheet with
respect to the Offered Warrants or Rights has been





CCC Information Services Group Inc.
CCCISG Capital Trust
June 29, 2001
Page 7

prepared, delivered and filed in compliance with the Securities Act and the
applicable rules and regulations thereunder; (iii) if the Offered Warrants or
Rights are to be sold pursuant to a firm commitment underwritten offering, an
underwriting agreement with respect to the Offered Warrants or Rights has
been duly authorized, executed and delivered by the Company and the other
parties thereto; (iv) the Board of Directors, including any appropriate
committee appointed thereby, and appropriate officers of the Company have
taken all necessary corporate action to approve the issuance and terms of the
Offered Warrants or Rights and related matters; (v) the terms of the Offered
Warrants or Rights and of their issuance and sale have been duly established
in conformity with the Warrant or Rights Agreement so as not to violate any
applicable law, the Certificate of Incorporation or the By-laws or result in
a default under or breach of any agreement or instrument binding upon the
Company and so as to comply with any requirement or restriction imposed by
any court or governmental body having jurisdiction over the Company by the
Company and the applicable Warrant Agent; and (vi) the Offered Warrants or
Rights have been duly executed, delivered and countersigned in accordance
with the provisions of the Warrant or Rights Agreement and duly issued and
sold in the applicable form to be filed as an exhibit to the Registration
Statement or any amendment thereto and in the manner contemplated in the
Registration Statement or any prospectus supplement or term sheet relating
thereto, the Offered Warrants or Rights, when issued and sold in accordance
with the applicable Warrant or Rights Agreement and the applicable
underwriting agreement or any other duly authorized, executed and delivered
valid and binding purchase or agency agreement, will be valid and binding
obligations of the Company, enforceable against the Company in accordance
with their respective terms, except to the extent that enforcement thereof
may be limited by (a) bankruptcy, insolvency, reorganization, fraudulent
conveyance, moratorium or other similar laws now or hereafter in effect
relating to creditors' rights generally, (b) general principles of equity
(regardless of whether enforceability is considered in a proceeding at law or
in equity) and (c) public policy considerations which may limit the rights of
parties to obtain further remedies.

         I hereby consent to the filing of this opinion with the Commission as
an exhibit to the Registration Statement. I also consent to the use of my name
under the caption "Legal Matters" in the Registration Statement. In giving this
consent, I do not thereby admit that I am included in the category of persons
whose consent is required under Section 7 of the Securities Act or the Rules and
Regulations of the Commission promulgated thereunder. This opinion is expressed
as of the date hereof unless otherwise expressly stated, and we disclaim any
undertaking to advise you of any subsequent changes of the facts stated or
assumed herein or any subsequent changes in applicable law.

                                       Very truly yours,

                                       /s/ Robert Guttman

                                       Robert Guttman