1
                                                FILED PURSUANT TO RULE 424(b)(3)
                                                      REGISTRATION NO. 333-31342


PROSPECTUS SUPPLEMENT NO. 13 DATED SEPTEMBER 1, 2000
TO PROSPECTUS DATED APRIL 6, 2000, AS SUPPLEMENTED
ON APRIL 17, 2000, APRIL 25, 2000, MAY 8, 2000,
MAY 22, 2000, MAY 30, 2000, JUNE 9, 2000,
JUNE 21, 2000, JULY 5, 2000, JULY 19, 2000,
JULY 27, 2000, AUGUST 16, 2000 AND AUGUST 24, 2000


                              i2 TECHNOLOGIES, INC.


    $350,000,000 5 1/4% CONVERTIBLE SUBORDINATED NOTES DUE DECEMBER 15, 2006
                                       AND
     4,605,790 SHARES OF COMMON STOCK ISSUABLE UPON CONVERSION OF THE NOTES


     The information contained in the table appearing under the heading "Selling
Securityholders" on pages 35-37 of the prospectus is hereby amended to add the
following information:



                                                                                                         SHARES OF
                                                                   PRINCIPAL AMOUNT    PERCENTAGE OF    COMMON STOCK
                                                                     OF NOTES THAT         NOTES        THAT MAY BE
NAME OF SELLING SECURITYHOLDER                                        MAY BE SOLD       OUTSTANDING       SOLD(1)
                                                                   ------------------ ---------------- ---------------
                                                                                               
GLG Market Neutral Fund.........................................      $7,500,000           2.1%            98,695
McMahan Securities Co. L.P......................................      $  100,000              *             1,315



     The information contained in the table appearing under the heading "Selling
Securityholders" on pages 35-37 of the prospectus, as supplemented prior to the
date of this prospectus supplement, with respect to the Selling Securityholders
named below, is hereby deleted and restated with the following information:



                                                                                                         SHARES OF
                                                                   PRINCIPAL AMOUNT    PERCENTAGE OF    COMMON STOCK
                                                                     OF NOTES THAT         NOTES        THAT MAY BE
NAME OF SELLING SECURITYHOLDER                                        MAY BE SOLD       OUTSTANDING       SOLD(1)
                                                                   ------------------ ---------------- ---------------
                                                                                                
Goldman, Sachs & Co.............................................      $ 250,000              *             3,289




-----------

  *  Indicates less than one percent.

(1)  Assumes full conversion of the notes held by each holder at the rate of
     13.1594 shares per each $1,000 in principal amount of notes.