Exhibit 2.4 Serco Group, Inc. I Telephone: 609-346-8800 I Fax: 609-346-8463 20 E. Clementon Road I Gibbsboro I N.J. 08026 January 29, 1997 Mr. Thomas Eisenman President SeTech, Inc. 905 Industrial Drive Murfreesboro, Tennessee 31370-4381 USA Dear Mr....

                           Exhibit 2.4


Serco Group, Inc. I Telephone: 000-000-0000 I Fax: 000-000-0000
00 X. Xxxxxxxxx Xxxx I Gibbsboro I N.J. 08026





January 29, 1997

Xx. Xxxxxx Xxxxxxxx
President
SeTech, Inc.
000 Xxxxxxxxxx Xxxxx
Xxxxxxxxxxxx, Xxxxxxxxx  00000-0000
XXX

Dear Xx. Xxxxxxxx:

This letter agreement shall confirm that in connection with its
purchase of the stock of Xxxxxx ATC, Inc. and Xxxxxx ATC
International, Inc. ("the companies"),  Serco Group, Inc. assumes
all responsibility for providing group health benefits to the
following employees of the companies as of May 1, 1997.  Until such
date it is agreed that you shall maintain such benefits under the
present policy, for which we shall reimburse you upon presentation
of premium statements.  These employees are currently provided
group medical, dental and vision insurance through SeTech, Inc.'s
group policy number 356230 with Great-West Life & Annuity Insurance
Company.


Xxxxxx ATC International, Inc. Employees

Xxxxxx X. Xxxx
Xxxxx X. Xxxxxx
Xxxx X. Xxxxx
Xxxxxx X. Xxxxx
Xxx X. Xxxxxxxx
Xxxxxxx X. Xxxxxxx
Xxxxx X. Xxxxxx
Xxxxxxxxx X. Xxxxxx
Xxxxx X. Asp
Xxxxxx X. Xxxxxx
Xxxxxxxx X. Xxxxxx
Xxxx X. Balzac
Xxxxxx X. Xxxxxxxx
Xxxxxx X. Xxxx
Xxxxxx X. Xxxxx
Xxxxxx X. Xxxxxx
Xxxx X. Xxxxxxxxx
Xxxxxx X. Xxxxxxxxx
Xxxxx X. Xxxxxx
Xxxxxxx X. Boom
Xxxxx X. Xxxxxxx
Xxxxxx X. Xxxxxx
Xxxxxxx X. Xxxxx
Xxxxx X. Xxxxxx
Xxxxxx X. Xxxxxxxxx
Xxxxxx X. Xxxxxxxx
Xxxxxxx X. Xxxxx
Xxxxxx X. Xxxxx
Xxxxxx X. Xxxxx
Xxxxxx X. Xxxxxxx
Xxxxx X. Xxxxxxxx
Xxxxxx X. Xxxxxxxxxxx
Xxxxxxx X. Xxxxxxxxxxx
Xxxxxx X. Xxxxxxxx
Xxxxx X. Xxxxxxxx
Xxxxxx X. Xxxxxx
Xxxxxxx Xxxxx
Xxxxxxx X. Christmas
Xxxxx Xxxxxxxxxxx
Xxxxx X. Xxxxx
Xxxxxxx X. Xxxxx
Xxxx (Xxx) A. Clue
Xxxx X. Xxxxxx
Xxxx X. Xxxx, Xx.
Xxxx X. Xxxxx
Xxxxxx X. Xxxxx
Xxxxxxxxx Xxxx, Xx.
Xxxxxxx X. Xxxxxxx
Xxxxxxx X. Xxxxx, Xx.
Xxxxxxx X. Xxxxxx
Xxxxxxxx X. Xxxxxxxx
Xxxxxx X. Xxxxxx
Xxxx X. Xxxxxx
Xxxx X. Xxxxx
Xxxx X. Xxxx
Xxxxxx X. Xxxx
Xxxx X. Xxxxxxxxxx
Xxxx X. Xxxxxxx
Xxxxxx X. Xxxxxxxxxx
Xxxxxx X. Xxxxx
Xxxxx X. Xxxxxx
Xxxxxxx X. Xxxxxxxxxxx
Xxxx X. Xxxxxxx
Xxxxx X. Xxxxxxxxxxx
Xxxxx X. Xxxxxxx
Xxxxx X. Xxxxxx
Xxxxx X. Xxxxxxxx
Xxxxxxx X. Xxxxxx
Xxxx X. Xxxxxxx
Xxxxxxx X. Xxxxxx
Xxxxxxx X. Xxxx
Xxxxx X. Xxxxxxx
Xxxx X. Xxxxx
Xxxx X. Xxxxxxxx
Xxxx X. Xxxxxxx
Xxxxxxx X. Xxxxxxxxx
Xxxxx X. Xxxxxxx
Xxxxx X. Xxxxxxxx
Xxxxxx X. Xxxxx
Xxxx X. Xxxxxxx
Xxxx "Xxxx" X. Xxxxxx
Xxxxxxx X. Xxxxxxxx
Xxx Xxxxx, III
Xxxxx X. Xxxxx
Xxxx X. Xxxxxxx
Xxxxxx X. Xxxxxx, XX
Xxxxx X. High
Xxxxxxx X. Xxxxxxx
Xxxxxxx X. Xxxxxx
Xxxxxx X. Xxxxx
Xxxxx X. Xxxxxx
Xxxx X. Xxxxxx
Xxxxx X. Xxxxx
Xxxxx X. Xxxxxx
Xxxxxx X. Xxxxx
Xxxxx X. Xxxxxxxx
Xxxxx X. Xxxxx, Xx.
Xxxx X. Xxxxx
Xxxxxxxx X. Xxxx
Xxxxxx X. Xxxxx
Xxxxxx Xxxxxxx
Xxxxxxx X. Xxxx
Xxxxx X. Xxxxxxxxx
Xxxxxxx X. Xxxxxx
Xxxxxxx X. Xxxxxxxx
Xxxxxxx X. Xxxxxxxx
Xxx X. Xxxxxxxxxx
Xxxx X. Xxxxxxxxxx
Xxxxx X. Xxxxxxxx
Xxxxxx X. Xxxx
Xxxxxx X. XxxXxxxx
Xxxxxxx X. Xxxxxxx
Xxxxxx X. Xxxxxxx
Xxxxxxx X. Xxxxx
Xxxxxxx X. XxXxxx
Xxxxx X. Xxxxxxxx
Xxxxx X. Xxxxxx
Xxxx X. Xxxxxxx
Xxxx  X. Xxxxxxxx
Xxxx X. Xxxxx
Xxxx X. Xxxxxxx
Xxxxxx X. Xxxxxx
Xxxxx X. Xxxxxx
Xxxxx X. Xxxxx
Xxxxxxxx X. Xxxx
Xxxxxxx X. Xxxxxx
Xxxxxx X. Xxxxxx
Xxxx X. Xxxxxxx
Xxxxxxxx X. Xxxxxxx
Xxxxxxx X. Xxxxxx
Xxxx X. Xxxxx
Xxxxxxx X. Xxxxx
Xxxxxx X. Xxxxxxx
Xxxxxx X. Xxxxx
Xxxxx X. Xxxxxxxx
Xxxxxx X. Xxxxxxxx
Xxxxxx X. Xxxxxx
Xxxxxx X. Xxxxx
Xxxxxx X. Xxxxxx
Xxxx X. Xxxxxx
Xxxxxxx X. Xxxxx
Xxxxx X. Xxxxxxxx
Xxxxxxx X. Xxxx
Xxxxxx X. Xxxx
Xxxxxxx X. Xxxxxxx
Xxxxx X. Xxxxxxxxx
Xxxx X. Xxxxxx
Xxxx X. Xxxxxx
Xxx X. Xxxxxxx
Xxxxxxx X. Xxxxx
Xxxxxxxx X. Xxxxx
Xxxxxx X. Xxxxxxx
Xxxxxxx X. Xxxxxxx
Xxxxx X. Xxxxxxxx

Xxxxxx X. Xxxxx
Xxxxxx X. Xxxxx
Xxxxx X. Xxxxxx
Xxxxxxx X. Xxxxxxxx
Xxxxx X. Xxxxxxxx
Xxxxxxxx X. Xxxxxx
Xxxxx X. Xxxxxx
Xxxxxxx X. Xxxxxx
Xxxxx X. Xxxxx
Xxxxxxx X. Xxxxxxxxx 
Xxxxxx Xxxxx
Xxxxxx X. Xxxxxx
Xxx X. Xxxxxxxx
Xxxxxx X. Xxxxxxx
Xxxxxx X. Xxxxxxx
Xxxxx X. Xxxxxx
Xxxxxxx X. Xxxxx
Xxxxx X. Xxxxxx
Xxxxx X. Xxxxxx
Xxxxx X. Xxxxx
Xxxxxxx X. Xxxxx

Xxxxxx ATC, Inc. Employees

Xxxxxx Xxxxxx, Xx.
Xxxxx X. Xxxxxxxx
Xxxxxxxxxxx X. Xxxxxxxxxx
Xxxxx X. Xxxxxx
Xxxxx X. Xxxxxx
Xxxxxxx X . Xxxxxx
Xxxxxxx X. Xxxxxxx
Xxxxx X. Xxxxxx
Xxxxx X. XxXxxxxxx
Xxxxx X. XxXxxxxxxx
Xxxx X. Xxxxxxx
Xxxxxx X. Xxxxxx
Xxxxx X. Xxxxxx

Xxxxx Xxxxx
Xxxxxxx X. Xxxxxxxxx
Xxxxxx X. Xxxxxxx
Xxxxx X. Xxxxxx
Xxxxxxx X. Xxxxxx
Xxxxx X. Xxxxx
Xxxxxx X. Xxxxxxx 
Xxxxxx X. Xxxxxx
Xxxxxxx X. Xxxxxx
Xxxxxx X. Xxxxxxxxxx
Xxxxxxx X. Xxxxx
Xxxxx X. Xxxxx
Xxxxxxx X. Xxxxxx
Also to be included in the list of insured employees is Xxxxxxx
Xxxxxx.

By this letter and pursuant to Section 16 of the Stock Purchase
Agreement dated November 7, 1996, SeTech and Serco Group, Inc.
agree to amend the Agreement, as described above.  

Please acknowledge your agreement to the foregoing by signing this
letter.

Yours truly,

Serco Group, Inc.



_________________________
By:   Xxxxxx X. Xxxxxxxxxx
   Director

                           Agreed and Accepted this
                           _____ day of January, 1997.

                           SeTech, Inc.



                           _________________________
                           By:   Xxxxxx X. Xxxxxxxx
                              President