<PAGE> 1
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D. C. 20549
SCHEDULE 13G
UNDER THE SECURITIES EXCHANGE ACT OF 1934
(AMENDMENT NO. 1)
MPSI SYSTEMS, INC.
------------------------------
(NAME OF ISSUER)
COMMON STOCK
------------------------------
(TITLE OF CLASS OF SECURITIES)
553412206
----------------------
(CUSIP NUMBER)
12/31/99
----------------------
(DATE)
CHECK THE FOLLOWING BOX IF FEE IS BEING PAID WITH THIS STATEMENT
----------------------------------------------------------------
<PAGE> 2
CUSIP NO. 553412206
---------------
- --------------------------------------------------------------------------------
1) Names of Reporting Persons I.R.S. No. 31-0738296
S.S. or I.R.S. Identification Nos. of BANK ONE CORPORATION
Above Persons
- --------------------------------------------------------------------------------
2) Check the Appropriate Box if a
Member of a Group (a)
(See Instructions) -----------------
(b)
-----------------
- --------------------------------------------------------------------------------
3) SEC Use only
- --------------------------------------------------------------------------------
4) Citizenship or Place of
Organization ILLINOIS
- --------------------------------------------------------------------------------
Number of Shares (5) Sole Voting Power 235,773
Beneficially --------------
Owned by (6) Shared Voting Power 0
Each Reporting --------------
Person with (7) Sole Dispositive Power 235,773
--------------
(8) Shared Dispositive Power 0
--------------
- --------------------------------------------------------------------------------
9) Aggregate Amount Beneficially 235,773
Owned by Each Reporting Person --------------
- --------------------------------------------------------------------------------
10) Check if the Aggregate Amount
in Row (9) Excludes Certain
Shares (See Instructions)
- --------------------------------------------------------------------------------
11) Percent of Class Represented
by Amount in Row 9 8.3%
--------------
- --------------------------------------------------------------------------------
12) Type of Reporting Person HC
(See Instructions) --------------
<PAGE> 3
- --------------------------------------------------------------------------------
<TABLE>
SEC 13G
SECURITIES AND EXCHANGE COMMISSION
SCHEDULE 13G Amendment No. 1
<S> <C> <C>
Item 1(a)) Name of Issuer: MPSI Systems, Inc.
----------------------------
Item 1(b) Address of Issuer's principal executive
offices: 4343 South 118th East Ave.
----------------------------
Tulsa, OK 74146
----------------------------
Item 2(a) Name of person filing: BANK ONE CORPORATION
Item 2(b) Address of principal business office or, One First National Plaza
if none residence: Chicago, IL 60670
Item 2(c) Citizenship: Not Applicable
Item 2(d) Title of class of securities: Common Stock
-------------------------------------
Item 2(e) CUSIP No.: 553412206
-------------------------------------
Item 3. This statement is filed pursuant to Rule 13d-1(c).
Item 4. Ownership
This beneficial ownership by BANK ONE CORPORATION with respect to
common shares of MPSI Systems, Inc. :
-------------------------------------------------
(a) Amount beneficially owned: 235,773
(b) Percent of class ---------------
8.3%
---------------
(c) Number of shares as to which such person has:
(I) Sole power to vote or to direct the vote: 235,773
-------------
(ii) Shared power to vote or to direct the vote: 0
-------------
(iii) Sole power to dispose or to direct the 235,773
disposition of: -------------
(iv) Shared power to dispose or to direct the 0
disposition of: -------------
</TABLE>
<PAGE> 4
<TABLE>
<S> <C> <C>
Item 5. Ownership of 5 percent or less of a Class. N/A
----------
Item 6. Ownership of More than 5 percent on Behalf of Another Person. N/A
----------
Item 7. Identification and Classification of the Subsidiary Which Acquired the Security
Being Reported on By the Parent Holding Company.
----------
Bank One Trust Company, N.A.
Item 8. Identification and Classification of Members of the Group. N/A
----------
Item 9. Notice of Dissolution of Group. N/A
----------
Item 10. Certification.
After reasonable inquiry and to the best of my knowledge and belief, I certify
that the information set forth in this statement is true, complete, and correct.
Dated: February 9, 2000
------------------------
BANK ONE CORPORATION
By: /s/ DAVID J. KUNDERT
David J. Kundert
EXECUTIVE VICE PRESIDENT
</TABLE>
