SECURITIES AND EXCHANGE COMMISSION

                     Washington, D.C. 20549

                          Schedule 13G


           Under the Securities Exchange Act of 1934
                       (Amendment No. )*

                      ELOYALTY CORPORATION
            _______________________________________
                        (Name of Issuer)


                          Common Stock
            _______________________________________
                 (Title of Class of Securities)


                            290151307
             _______________________________________
                         (CUSIP Number)


Check the following box if a fee is being paid with this
statement ____.  (A fee is not required only if the filing
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 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).

                (Continued on following page(s))

                       Page 1 of 8 Pages
CUSIP NO. 290151307           13G            Page 2 of 8 Pages


1  Name of Reporting Person
   S.S. or I.R.S. Identification No. of Above Person

   T. ROWE PRICE ASSOCIATES, INC.
   52-0556948

2  Check the Appropriate Box if a Member of a Group*

                                                       (a) ____
   NOT APPLICABLE                                      (b) ____

3  SEC Use Only

   ______________________________

4  Citizenship or Place of Organization

   MARYLAND

Number of      5  Sole Voting Power
               **
Shares            1,804

Beneficially   6  Shared Voting Power
               **
Owned By Each     -0-

Reporting      7  Sole Dispositive Power
               **
Person            362,917

With           8  Shared Dispositive Power

                  -0-

9  Aggregate Amount Beneficially Owned by Each Reporting Person

   362,917

10 Check Box if the Aggregate Amount in Row (9) Excludes Certain
   Shares*

   NOT APPLICABLE

11 Percent of Class Represented by Amount in Row 9

   6.8%

12 Type of Reporting Person*
   IA

              *SEE INSTRUCTION BEFORE FILLING OUT!
        **Any shares reported in Items 5 and 6 are also
                      reported in Item 7.
CUSIP NO. 290151307          13G           Page 3 of 8 Pages

1  Name of Reporting Person
   S.S. or I.R.S. Identification No. of Above Person

   T.ROWE PRICE NEW HORIZONS FUND, INC.
   52-0791372

2  Check the Appropriate Box if a Member of a Group*
                                                       (a)
   NOT APPLICABLE                                      (b)

3  SEC Use Only


4  Citizenship or Place of Organization

   Maryland

Number of      5  Sole Voting Power
               **
Shares            270,408

Beneficially   6  Shared Voting Power
               **
Owned By Each     NONE

Reporting      7  Sole Dispositive Power
               **
Person            NONE

With           8  Shared Dispositive Power

                  NONE

9  Aggregate Amount Beneficially Owned by Each Reporting Person

   270,408

10 Check Box if the Aggregate Amount in Row (9) Excludes Certain
   Shares*

   NOT APPLICABLE

11 Percent of Class Represented by Amount in Row 9

   5.0%

12 Type of Reporting Person*
   IV

**The aggregate amount reported on this page is also included in
the aggregate amount reported by T. Rowe Price Associates, Inc.
on page 2 of this Schedule 13G.


SCHEDULE 13G
PAGE 4 OF 8 PAGES


Item 1(a) Name of Issuer:

          Reference is made to page 1 of this Schedule 13G


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

          150 Field Drive, Suite 250, Lake Forest, IL 60045


Item 2(a) Name of Person(s) Filing:

          (1)  T. Rowe Price Associates, Inc. ("Price
               Associates")

          (2)  T. Rowe Price New Horizons Fund, Inc.

   X      Attached as Exhibit A is a copy of an agreement between
          the Persons Filing (as specified hereinabove) that this
          Schedule 13G is being filed on behalf of each of them.


Item 2(b) Address of Principal Business Office:

          100 E. Pratt Street, Baltimore, Maryland 21202


Item 2(c) Citizenship or Place of Organization:

          (1)  Maryland

          (2)  Maryland


Item 2(d) Title of Class of Securities:

          Reference is made to page 1 of this Schedule 13G


Item 2(e) CUSIP Number: 290151307


Item 3    The person filing this Schedule 13G is an:

  X       Investment Adviser registered under Section 203 of the
          Investment Advisers Act of 1940

  X       Investment Company registered under Section 8 of the
          Investment Company Act of 1940

CUSIP 290151307
PAGE 5_OF 8 PAGES____

Item 4    Ownership                           Deemed
                                           Outstanding
                                               And
                                           Beneficially
                              Units       Owned Directly
                              Deemed        Subject to
                           Beneficially     Warrants &
                              Owned         Conversion
                             Directly       Privileges    Total
____________   _____________________

(1) WITH RESPECT TO PRICE ASSOCIATES
    (includes shares
    reported in
    (2) below):

    (a) Amount
        Beneficially
        Owned . . . . . .     200,000       162,917      362,917

        Class . . . . . . . . . . . . . . . . . . . . . .   6.8%

    (c) Number of
        units as
        to which
        such
        person has: . . .

       (i)  *sole power
            to vote or
            to direct
            the vote . . .      -0-          1,804         1,804

      (ii)  *shared power
            to vote or
            to direct
            the vote . . .      -0-            -0-           -0-

     (iii)  *sole power
            to dispose or
            to direct the
            disposition
            of . . . . .     200,000        162,917      362,917

      (iv)  *shared power
            to dispose or
            to direct the
            disposition
            of . . . . .        -0-             -0-           -0-
(2)WITH RESPECT TO
    T. ROWE PRICE NEW HORIZONS FUND, INC.
    (if this is a
    joint filing):

    (a) Amount
        Beneficially
        Owned . . . . . .    150,000        120,408       270,408

    (b) Percent of
        Class . . . . . . . . . . . . . . . . . . . . . .    5.0%

    (c) Number of
        units as
        to which
        such person
        has . . . . . . .
       (i)  *sole power to
            vote or to
            direct the
            vote . . . .     150,000        120,408       270,408

      (ii)  *shared power
            to vote or
            to direct
            the vote . . .      -0-           -0-            -0-

     (iii)  *sole power
            to dispose or
            to direct the
            disposition
            of . . . . .        -0-           -0-            -0-

      (iv)  *shared power
            to dispose or
            to direct the
            disposition
            of . . . . .        -0-           -0-            -0-


*Units reported in subcategories (i) and (ii) are also included
in subcategory (iii) or (iv).
SCHEDULE 13G
PAGE 7 OF 8 PAGES

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

  X    Not Applicable.

_____  This statement is being filed to report the fact that, as
       of the date of this report, the reporting person(s) has
       (have) ceased to be the beneficial owner of more than five
       percent of the class of securities.


Item 6 Ownership of More than Five Percent on Behalf of Another
       person

       (1) Price Associates does not serve as custodian of the
           assets of any of its clients; accordingly, in each
           instance only the client or the client's custodian or
           trustee bank has the right to receive dividends paid
           with respect to, and proceeds from the sale of, such
           securities.

           The ultimate power to direct the receipt of dividends
           paid with respect to, and the proceeds from the sale
           of, such securities, is vested in the individual and
           institutional clients which Price Associates serves as
           investment adviser.  Any and all discretionary
           authority which has been delegated to Price Associates
           may be revoked in whole or in part at any time.

           Except as may be indicated if this is a joint filing
           with one of the registered investment companies
           sponsored by Price Associates which it also serves as
           investment adviser ("T. Rowe Price Funds"), not more
           than 5% of the class of such securities is owned by
           any one client subject to the investment advice of
           Price Associates.

       (2) With respect to securities owned by any one of the T.
           Rowe Price Funds, only State Street Bank and Trust
           Company, as custodian for each of such Funds, has the
           right to receive dividends paid with respect to, and
           proceeds from the sale of, such securities.  No other
           person is known to have such right, except that the
           shareholders of each such Fund participate
           proportionately in any dividends and distributions so
           paid.

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.
SCHEDULE 13G
PAGE 8 OF 8 PAGES

Item 9   Notice of Dissolution of Group.

         Not Applicable.

Item 10  Certification.

         By signing below I (we) certify that, to the best of my
         (our) 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.  T. Rowe Price
         Associates, Inc. hereby declares and affirms that the
         filing of Schedule 13G shall not be construed as an
         admission that Price Associates is the beneficial owner
         of the securities referred to, which beneficial
         ownership is expressly denied.

                           Signature.

         After reasonable inquiry and to the best of my (our)
         knowledge and belief, I (we) certify that the
         information set forth in this statement is true,
         complete and correct.


Dated: February 14, 2002           Dated: February 14, 2002


T. ROWE PRICE NEW HORIZONS         T. ROWE PRICE ASSOCIATES, INC.
FUND, INC.

By: s/s Joseph A. Carrier          By: /s/ Henry H. Hopkins
    Joseph A. Carrier,                 Henry H. Hopkins,
    Treasurer                          Managing Director


Note:    This Schedule 13G, including all exhibits, must be filed
         with the Securities and Exchange Commission, and a copy
         hereof must be sent to the issuer by registered or
         certified mail not later than February 14th following
         the calendar year covered by the statement or within the
         time specified in Rule 13d-1(b)(2), if applicable.

12/31/2001






                                                  EXHIBIT A


                           AGREEMENT

                  JOINT FILING OF SCHEDULE 13G


     T. Rowe Price Associates, Inc. (an investment adviser
registered under the Investment Advisers Act of 1940) and T. Rowe
Price New Horizons Fund, Inc., a Maryland corporation hereby
agree to file jointly the statement on Schedule 13G to which this
Agreement is attached, and any amendments thereto which may be
deemed necessary, pursuant to Regulation 13D-G under the
Securities Exchange Act of 1934.

     It is understood and agreed that each of the parties hereto
is responsible for the timely filing of such statement and any
amendments thereto, and for the completeness and accuracy of the
information concerning such party contained therein, but such
party is not responsible for the completeness or accuracy of
information concerning the other party unless such party knows or
has reason to believe that such information is inaccurate.

     It is understood and agreed that a copy of this Agreement
shall be attached as an exhibit to the statement on Schedule 13G,
and any amendments hereto, filed on behalf of each of the parties
hereto.


Dated: February 14, 2002           Dated: February 14, 2002


T. ROWE PRICE NEW HORIZONS         T. ROWE PRICE ASSOCIATES, INC.
FUND, INC.

By: ______________________         By: ______________________
    Joseph A. Carrier,                 Henry H. Hopkins,
    Treasurer                          Managing Director