NICHOLS RESEARCH CORP /AL/
SC 13G/A, 2000-02-11
ENGINEERING SERVICES
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                  SCHEDULE 13G


                    Under the Securities Exchange Act of 1934

                               (Amendment No. 5)*


                          Nichols Research Corporation
                                (Name of Issuer)

                                  Common Stock
                         (Title of Class of Securities)

                                    653818104
                                 (CUSIP Number)

                                December 31, 1999
             (Date of Event Which Requires Filing of this Statement)

Check the  appropriate box to designate the rule pursuant to which this Schedule
13G is filed:

     |X| Rule 13d-1(b)
     |_| Rule 13d-1(c)
     |_| Rule 13d-1(d)

*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).

<PAGE>


CUSIP NO.  653818104
- --------------------------------------------------------------------------------
1.   Names of Reporting Persons.  Palisade Capital Management, L.L.C.
     I.R.S. Identification Nos. Of Above Persons (entities only):  22-3330049
- --------------------------------------------------------------------------------

2.   Check the Appropriate Box if a Member of a Group (See Instructions) N/A
     (a)______                  (b)_______
- --------------------------------------------------------------------------------

3.   SEC Use Only
- --------------------------------------------------------------------------------

4.   Citizenship or Place of Organization:  New Jersey
- --------------------------------------------------------------------------------

Number of Shares Beneficially        5.  Sole Voting Power            0
Owned by Each Reporting
Person With:                         6.  Shared Voting Power          N/A
                                     7.  Sole Dispositive Power       0
                                     8.  Shared Dispositive Power     N/A
- --------------------------------------------------------------------------------

9.   Aggregate Amount Beneficially Owned by Each Reporting Person:  0
- --------------------------------------------------------------------------------

10.  Check if the  Aggregate  Amount in Row (9)  Excludes  Certain  Shares  (See
     Instructions): N/A
- --------------------------------------------------------------------------------

11.  Percent of Class Represented by Amount in Row (9): 0.0%
- --------------------------------------------------------------------------------

12.  Type of Reporting Person (See Instructions):  IA
- --------------------------------------------------------------------------------


                                      -2-

<PAGE>


Item 1.

(a)  Name Of Issuer: Nichols Research Corporation

- --------------------------------------------------------------------------------
(b)  Address of  Issuer's  Principal  Executive  Offices:  4090  South  Memorial
     Parkway, Huntsville, Alabama 35815-1502

- --------------------------------------------------------------------------------


Item 2.

(a)  Name of Person Filing: Palisade Capital Management, L.L.C.

- --------------------------------------------------------------------------------
(b)  Address of Principal  Business  Office or, if none,  Residence:  One Bridge
     Plaza, Suite 695, Fort Lee, NJ 07024

- --------------------------------------------------------------------------------
(c)  Citizenship:  New Jersey

- --------------------------------------------------------------------------------
(d)  Title of Class of Securities:  Common Stock
- --------------------------------------------------------------------------------
(e)  CUSIP Number:  653818104
- --------------------------------------------------------------------------------

Item 3.   If  this   statement  is  filed  pursuant  to   ss.ss.240.13d-1(b)  or
          240.13d-2(b) or (c), check whether the person filing is a:

          (a)  |_| Broker or dealer  registered  under Section 15 of the Act (15
               U.S.C. 78o);

          (b)  |_| Bank as  defined  in  Section  3(a)(6)  of the Act (15 U.S.C.
               78c);

          (c)  |_| Insurance  company as defined in Section  3(a)(19) of the Act
               (15 U.S.C. 78c);

          (d)  |_|  Investment   company  registered  under  Section  8  of  the
               Investment Company Act of 1940 (15 U.S.C. 80a-8);

          (e)  |X|    An    investment     adviser    in     accordance     with
               ss.240.13d-1(b)(1)(ii)(E);

          (f)  |_| An employee benefit plan or endowment fund in accordance with
               ss.240.13d- 1(b)(1)(ii)(F);

          (g)  |_| A parent holding company or control person in accordance with
               ss.240.13d- 1(b)(1)(ii)(G);


                                      -3-

<PAGE>


          (h)  |_| A savings  associations  as defined  in  Section  3(b) of the
               Federal Deposit Insurance Act (12 U.S.C. 1813);

          (i)  |_| A church  plan that is  excluded  from the  definition  of an
               investment  company  under  Section  3(c)(14)  of the  Investment
               Company Act of 1940 (15 U.S.C. 80a-3);

          (j)  |_| Group, in accordance with ss.240.13d-1(b)(1)(ii)(J).


Item 4.   Ownership.

          (a)  Amount beneficially owned: 0

          (b)  Percent of Class: 0.0%

          (c)  Number of shares as to which the person has:

               (i)   Sole power to vote or to direct the vote 0

               (ii)  Shared power to vote or to direct the vote N/A

               (iii) Sole power to dispose or to direct the disposition of 0

               (iv)  Shared power to dispose or to direct the disposition of N/A


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

     If this  statement  is being  filed to report  the fact that as of the date
hereof the reporting  person has ceased to be the beneficial  owner of more than
five percent of the class of securities, check the following |X|.

Item 6.   Ownership of More Than Five 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.

               N/A

Item 8.   Identification and Classification of Members of the Group.

               N/A


                                      -4-

<PAGE>


Item 9.   Notice of Dissolution of Group.

               N/A

Item 10.  Certification.

By signing  below,  I certify that, to the best of my knowledge and belief,  the
securities  referred to above were not acquired and are not held for the purpose
of or with the effect of  changing or  influencing  the control of the issuer of
such  securities and were not acquired and are not held in connection with or as
a participant in any transaction having that purpose or effect.


                                    SIGNATURE

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.


                                                     02/10/00
                                                     --------------------
                                                     Date

                                                     /s/ Steven E. Berman
                                                     --------------------

      Attention: Intentional misstatements or omissions of fact constitute
                Federal criminal violations (See 18 U.S.C. 1001)


                                      -5-



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