<PAGE>   1
As filed with the Securities and Exchange Commission on July 3, 1997.
                                                Registration No. 333-___________
================================================================================

                     SECURITIES AND EXCHANGE COMMISSION
                           WASHINGTON, D.C.  20549

                       -------------------------------
                                  FORM S-8
                        REGISTRATION STATEMENT UNDER
                         THE SECURITIES ACT OF 1933

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

                            DELTEK SYSTEMS, INC.
           (Exact name of registrant as specified in its charter)

<TABLE>
<S>                                                     <C>
        VIRGINIA                                        54-1252625
(State or Other Jurisdiction of                         (I.R.S. Employer
Incorporation or Organization)                          Identification No.)
</TABLE>                                                

                             8380 GREENSBORO DRIVE
                             MCLEAN, VIRGINIA 22102
                                 (703) 734-8606
  (Address, including zip code, and telephone number, including area code, of
                   registrant's principal executive offices)

                  DELTEK SYSTEMS, INC. 1996 STOCK OPTION PLAN
                                      AND
             DELTEK SYSTEMS, INC. 1996 EMPLOYEE STOCK PURCHASE PLAN
                              (Full Title of Plan)     
  
                         -------------------------------

                               KENNETH E. DELASKI
                     PRESIDENT AND CHIEF EXECUTIVE OFFICER
                              DELTEK SYSTEMS, INC.
                             8280 GREENSBORO DRIVE
                             MCLEAN, VIRGINIA 22102
                                 (703) 734-8606
 (Name, address, including zip code, and telephone number, including area code,
                             of agent for service)

                         -------------------------------
                                   Copies to:
                           Kathleen L. Cerveny, Esq.
                             Robert E. Gregg, Esq.
                              Hazel & Thomas, P.C.
                      3110 Fairview Park Drive, Ste. 1400
                            Falls Church, VA  22042
                                 (703) 641-4200

         If any of the securities being registered on this Form are to be
offered on a delayed or continuous basis pursuant to Rule 415 under the
Securities Act of 1933, check the following box:  [x]

                       CALCULATION OF REGISTRATION FEE
<TABLE>
<CAPTION>
============================================================================================================================
                                                              Proposed Maximum         Proposed Maximum          Amount of
                                            Amount to        Aggregate Price Per      Aggregate Offering       Registration
  Title of Securities to be Registered    be Registered           Share (1)                Price (1)               Fee
----------------------------------------------------------------------------------------------------------------------------
 <S>                                      <C>                      <C>                  <C>                      <C>
 Common Stock, $.001 par value             900,000 (2)             $17.25               $15,525,000.00           $4,704.55
 Common Stock, $.001 par value             900,000 (3)              $ ---                    $ --                $ -- (6)
 Interests in Stock Purchase Plan(4)      Indeterminate             $ ---                    $ --                 $ --
 Common Stock, $.001 per value              399,999(5)             $17.25                $6,899,982.75           $2,090.90
 Common Stock, $.001 per value               399,999               $ ----                    $ --                $  -- (6)
                                                                                                                 ---------

                                                                                                                 $6,795.45
============================================================================================================================
</TABLE>

                                                                (notes overleaf)
<PAGE>   2
(1)      Calculated in accordance with Rule 457(h) under the Securities Act of
         1933, as amended, based upon the closing bid price for the Common
         Stock on June 26, 1997.

(2)      Represents the maximum number of shares as to which options may be
         granted under the Deltek Systems, Inc. 1996 Stock Option Plan (the
         "Option Plan").  In addition to such shares, this Registration
         Statement covers such additional number of shares as may be required
         by reason of the operation of the antidilution provisions of the
         Option Plan.

(3)      Represents the same shares described in the line above, which may be
         resold by the holders of options issued or issuable under the Option
         Plan.

(4)      Represents interests of (and options deemed to be granted to)
         participants in the Deltek Systems, Inc. 1996 Employee Stock Purchase
         Plan (the "Purchase Plan").

(5)      Represents the maximum number of shares as to which options may 
         be granted under the Purchase Plan.  In addition to such shares, this
         Registration Statement covers such additional number of shares as may
         be required by reason of the operation of the antidilution provisions
         of the Purchase Plan.

(6)      Pursuant to Rule 457(h)(3), no additional fee is payable since these
         shares, which may be offered for resale, are the same shares being
         registered hereby upon their initial issuance pursuant to the Option
         Plan and Purchase Plan, respectively.
<PAGE>   3
                                     PART I

              INFORMATION REQUIRED IN THE SECTION 10(a) PROSPECTUS

ITEM 1.  PLAN INFORMATION

ITEM 2.  REGISTRANT INFORMATION AND EMPLOYEE PLAN ANNUAL INFORMATION

         The documents containing the information specified in this Part I will
be sent or given to participants in the Deltek Systems, Inc. 1996 Stock Option
Plan and to participants in the Deltek Systems, Inc. 1996 Employee Stock
Purchase Plan to which this Registration Statement relates, as specified by
Rule 428(b) promulgated under the Securities Act of 1933, as amended, and are
not filed as part of this Registration Statement.
<PAGE>   4
                                    PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 3. INCORPORATION OF DOCUMENTS BY REFERENCE.

         The following documents, and any amendments thereto, filed by Deltek
Systems, Inc. (the "Company") with the Securities and Exchange Commission are
incorporated by reference in this Registration Statement and shall be deemed to
be a part hereof from the date of filing such documents.

         (a)     The Company's Quarterly Report on Form 10-Q for the quarter
                 ended March 31, 1997 (File No. 0-22001);

         (b)     The Company's Prospectus dated February 25, 1997 filed
                 pursuant to Rule 424(b) under the Act (File No. 333-18247);

         (c)     The description of the Common Stock of the Company contained
                 in "Description of Capital Stock" in the Company's
                 Registration Statement on Form S-1 filed on February 24, 1997
                 (File No. 333-18247); and

         (d)     All reports filed by the Company pursuant to Sections 13(a),
                 13(c) and 15(d) of the Exchange Act subsequent to the date of
                 this Registration Statement and prior to the filing of a
                 post-effective amendment which indicates that all of the
                 securities offered hereby have been sold or which deregisters
                 all securities then remaining unsold.

ITEM 4. DESCRIPTION OF SECURITIES.

         Not Applicable.

ITEM 5. INTERESTS OF NAMED EXPERTS AND COUNSEL.

         Not Applicable.

ITEM 6.  INDEMNIFICATION OF OFFICERS AND DIRECTORS.

         Section 10 of the Virginia Stock Corporation Act (the "VSCA") allows
for indemnification, in certain circumstances, by a corporation of any person
threatened with or made a party to any action, suit or proceeding by reason of
the fact that he or she is, or was, a director, officer, employee or agent of
such corporation.  The Registrant's Articles of Incorporation provide for
mandatory indemnification of its directors and officers and for discretionary
indemnification of any employee or agent to the full extent permitted by the
VSCA,





                                      II-1
<PAGE>   5
including in circumstances in which indemnification is otherwise discretionary
under the VSCA.  In addition, the Registrant  has entered into separate
indemnification agreements with its directors and officers setting forth
certain procedures and other conditions applicable to claims for
indemnification pursuant to the Company's Articles of Incorporation and
agreeing, subject to certain limitations, to obtain and maintain directors' and
officers' liability insurance coverage for its directors and officers.  These
indemnification provisions may be sufficiently broad to permit indemnification
of the Registrant's officers and directors for liabilities (including
reimbursement of expenses incurred) arising under the Securities Act of 1933,
as amended.

         INSOFAR AS INDEMNIFICATION FOR LIABILITIES ARISING UNDER THE
SECURITIES ACT MAY BE PERMITTED TO DIRECTORS, OFFICERS OR PERSONS CONTROLLING
THE COMPANY PURSUANT TO THE FOREGOING PROVISIONS, THE COMPANY HAS BEEN INFORMED
THAT IN THE OPINION OF THE SECURITIES AND EXCHANGE COMMISSION, SUCH
INDEMNIFICATION IS AGAINST PUBLIC POLICY AS EXPRESSED IN THE SECURITIES ACT AND
IS THEREFORE UNENFORCEABLE.

ITEM 7.  EXEMPTION FROM REGISTRATION CLAIMED

         Not Applicable.

ITEM 8. EXHIBITS

         5.1     Opinion of Hazel & Thomas, P.C.

         10.1    1996 Stock Option Plan filed as Exhibit 10.3 to the
                 Registrant's Registration Statement on Form S-1 (No.
                 333-18247) and incorporated herein by reference.

         10.2    1996 Employee Stock Purchase Plan filed as Exhibit 10.4 to the
                 Registrant's Registration Statement on Form S-1 (No.
                 333-18247) and incorporated herein by reference.

         23(a)   Consent of Arthur Andersen L.L.P.

         23(c)   Consent of Counsel included in Exhibit 5.1.

ITEM 9. UNDERTAKINGS

         The undersigned Registrant hereby undertakes:

         A.      Rule 415 Offering.

         1.      To file, during any period in which offers or sales are being
made, a post-effective amendment to this Registration Statement:





                                      II-2
<PAGE>   6
                 (i)      To include any prospectus required by Section
10(a)(3) of the Securities Act of 1933.

                 (ii)     to reflect in the prospectus any facts or events
arising after the effective date of the registration statement (or the most
recent post-effective amendment thereof) which individually or in the
aggregate, represent a fundamental change in the information set forth in the
Registration Statement.

                 (iii)    To include any material information with respect to
the plan of distribution not previously disclosed in the Registration Statement
or any material change to such information in the Registration Statement.

         2.      That, for the purpose of determining any liability under the
Securities Act of 1993, each such post-effective amendment shall be deemed to
be a new Registration Statement relating to the securities offered therein, and
the offering of such securities at that time shall be deemed to be the initial
bona fide offering thereof.

         3.      To remove from registration by means of a post-effective
amendment any of the securities being registered which remain unsold at the
termination of the offering.

         B.      Subsequent Exchange Act Documents Incorporated by Reference:

         The undersigned Registrant hereby undertakes that, for purposes of
determining any liability under the Securities Act of 1993, each filing of the
issuer's annual report pursuant to Section 13(a) or Section 15(d) of the
Exchange Act, and each filing of the Purchase Plan's annual report pursuant to
Section 15(d) of the Exchange Act) that is incorporated by reference in the
Registration Statement shall be deemed to be a new Registration Statement
relating to the securities offered therein, and the offering of such securities
at that time shall be deemed to be the initial bona fide offering thereof.

         C.      Indemnification.

         1.      Insofar as indemnification for liabilities arising under the
Securities Act may be permitted to directors, officers, and controlling persons
of the Company pursuant to the foregoing provisions, or otherwise, the Company
has been advised that in the opinion of the Commission such indemnification is
against public policy as expressed in the Act and is, therefore, unenforceable.
In the event that a claim for indemnification against such liabilities (other
than the payment by the Company of expenses incurred or paid by a director,
officer, or controlling person of the Company in the successful defense of any
action, suit, or proceeding) is asserted by such director, officer, or
controlling person in connection with the securities being registered, the
Company will, unless in the opinion of its counsel the matter has been settled
by controlling precedent, submit to a court of appropriate jurisdiction the
question whether such





                                      II-3
<PAGE>   7
indemnification by it is against public policy as expressed in the Act and will
be governed by the final adjudication of such issue.





                                      II-4
<PAGE>   8
                                   SIGNATURES

         Pursuant to the requirements of the Securities Act of 1933, the
Company certifies that it has reasonable grounds to believe that it meets all
of the requirements for filing on Form S-8 and has duly caused this
Registration Statement to be signed on its behalf by the undersigned, thereunto
duly authorized, in the City of McLean, State of Virginia, on July 2, 1997.

                                           DELTEK SYSTEMS, INC.
                                           
                                           
                                           By: /s/ KENNETH E. DELASKI
                                               --------------------------------
                                               Kenneth E. deLaski, President
                                               and Chief Executive Officer


         Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed by the following persons in the
capacities indicated.

<TABLE>
<CAPTION>
Signature                                          Title                                      Date
<S>                                                <C>                                       <C>
/s/ KENNETH E. DELASKI                             President, Chief Executive                July 2, 1997
-------------------------------------------        Officer and Director                          
Kenneth E. deLaski                                 


/s/ DONALD DELASKI                                 Chairman of the Board of                  July 2, 1997
-------------------------------------------        Directors and Treasurer                        
Donald deLaski                                     


/s/ EVE F. BROWN                                   Executive Vice President,                 July 2, 1997
-------------------------------------------        Technical Operations                          
Eve F. Brown                                      


/s/ ALAN R. STEWART                                Chief Financial Officer                   July 2, 1997
-------------------------------------------        and Secretary                        
Alan R. Stewart                                   


/s/ ROBERT E. GREGG                                Director                                  July 3, 1997
-------------------------------------------                
Robert E. Gregg


/s/ DARRELL J. OYER                                Director                                  July 2, 1997
-------------------------------------------                
Darrell J. Oyer
</TABLE>
<PAGE>   9
                               INDEX TO EXHIBITS

<TABLE>
<CAPTION>
Exhibit No.      Title of Exhibit                                                              Page No.
----------       ----------------                                                              --------
<S>              <C>
5.1              Opinion of Hazel & Thomas, P.C.

10.1             1996 Stock Option Plan filed as Exhibit 10.3 to the Registrant's 
                 Registration Statement on Form S-1 (No. 333-18247)
                 and incorporated herein by reference.

10.2             1996 Employee Stock Purchase Plan filed as Exhibit 10.4 to the 
                 Registrant's Registration Statement on Form S-1 (No.
                 333-18247) and incorporated herein by reference.

23(a)            Consent of Arthur Andersen L.L.P.

23(c)            Consent of Counsel included in Exhibit 5.1.
</TABLE>
[{"type": "S-8", "sequence": "1", "description": "FORM S-8 REGISTRATION STATEMENT", "secsgml_size_bytes": 17925}]
{"company-data": {"conformed-name": "DELTEK SYSTEMS INC", "cik": "0001029299", "assigned-sic": "7371", "irs-number": "541252625", "state-of-incorporation": "VA", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "S-8", "act": "33", "file-number": "333-30717", "film-number": "97636009"}, "business-address": {"street1": "8280 GREENSBORO DRIVE", "city": "MCLEAN", "state": "VA", "zip": "22102", "phone": "7037048606"}, "mail-address": {"street1": "8280 GREENSBORO DRIVE", "city": "MCLEAN", "state": "VA", "zip": "22102"}}
1
As filed with the Securities and Exchange Commission on July 3, 1997.
                                                Registration No. 333-___________
================================================================================

                     SECURITIES AND EXCHANGE COMMISSION
                           WASHINGTON, D.C.  20549

                       -------------------------------
                                  FORM S-8
                        REGISTRATION STATEMENT UNDER
                         THE SECURITIES ACT OF 1933

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

                            DELTEK SYSTEMS, INC.
           (Exact name of registrant as specified in its charter)
VIRGINIA                                        54-1252625
(State or Other Jurisdiction of                         (I.R.S. Employer
Incorporation or Organization)                          Identification No.)
8380 GREENSBORO DRIVE
                             MCLEAN, VIRGINIA 22102
                                 (703) 734-8606
  (Address, including zip code, and telephone number, including area code, of
                   registrant's principal executive offices)

                  DELTEK SYSTEMS, INC. 1996 STOCK OPTION PLAN
                                      AND
             DELTEK SYSTEMS, INC. 1996 EMPLOYEE STOCK PURCHASE PLAN
                              (Full Title of Plan)     
  
                         -------------------------------

                               KENNETH E. DELASKI
                     PRESIDENT AND CHIEF EXECUTIVE OFFICER
                              DELTEK SYSTEMS, INC.
                             8280 GREENSBORO DRIVE
                             MCLEAN, VIRGINIA 22102
                                 (703) 734-8606
 (Name, address, including zip code, and telephone number, including area code,
                             of agent for service)

                         -------------------------------
                                   Copies to:
                           Kathleen L. Cerveny, Esq.
                             Robert E. Gregg, Esq.
                              Hazel & Thomas, P.C.
                      3110 Fairview Park Drive, Ste. 1400
                            Falls Church, VA  22042
                                 (703) 641-4200

         If any of the securities being registered on this Form are to be
offered on a delayed or continuous basis pursuant to Rule 415 under the
Securities Act of 1933, check the following box:  [x]

                       CALCULATION OF REGISTRATION FEE
============================================================================================================================
                                                              Proposed Maximum         Proposed Maximum          Amount of
                                            Amount to        Aggregate Price Per      Aggregate Offering       Registration
  Title of Securities to be Registered    be Registered           Share (1)                Price (1)               Fee
----------------------------------------------------------------------------------------------------------------------------
Common Stock, $.001 par value             900,000 (2)             $17.25               $15,525,000.00           $4,704.55
 Common Stock, $.001 par value             900,000 (3)              $ ---                    $ --                $ -- (6)
 Interests in Stock Purchase Plan(4)      Indeterminate             $ ---                    $ --                 $ --
 Common Stock, $.001 per value              399,999(5)             $17.25                $6,899,982.75           $2,090.90
 Common Stock, $.001 per value               399,999               $ ----                    $ --                $  -- (6)
                                                                                                                 ---------

                                                                                                                 $6,795.45
============================================================================================================================
(notes overleaf)
2
(1)      Calculated in accordance with Rule 457(h) under the Securities Act of
         1933, as amended, based upon the closing bid price for the Common
         Stock on June 26, 1997.

(2)      Represents the maximum number of shares as to which options may be
         granted under the Deltek Systems, Inc. 1996 Stock Option Plan (the
         "Option Plan").  In addition to such shares, this Registration
         Statement covers such additional number of shares as may be required
         by reason of the operation of the antidilution provisions of the
         Option Plan.

(3)      Represents the same shares described in the line above, which may be
         resold by the holders of options issued or issuable under the Option
         Plan.

(4)      Represents interests of (and options deemed to be granted to)
         participants in the Deltek Systems, Inc. 1996 Employee Stock Purchase
         Plan (the "Purchase Plan").

(5)      Represents the maximum number of shares as to which options may 
         be granted under the Purchase Plan.  In addition to such shares, this
         Registration Statement covers such additional number of shares as may
         be required by reason of the operation of the antidilution provisions
         of the Purchase Plan.

(6)      Pursuant to Rule 457(h)(3), no additional fee is payable since these
         shares, which may be offered for resale, are the same shares being
         registered hereby upon their initial issuance pursuant to the Option
         Plan and Purchase Plan, respectively.
3
                                     PART I

              INFORMATION REQUIRED IN THE SECTION 10(a) PROSPECTUS

ITEM 1.  PLAN INFORMATION

ITEM 2.  REGISTRANT INFORMATION AND EMPLOYEE PLAN ANNUAL INFORMATION

         The documents containing the information specified in this Part I will
be sent or given to participants in the Deltek Systems, Inc. 1996 Stock Option
Plan and to participants in the Deltek Systems, Inc. 1996 Employee Stock
Purchase Plan to which this Registration Statement relates, as specified by
Rule 428(b) promulgated under the Securities Act of 1933, as amended, and are
not filed as part of this Registration Statement.
4
                                    PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 3. INCORPORATION OF DOCUMENTS BY REFERENCE.

         The following documents, and any amendments thereto, filed by Deltek
Systems, Inc. (the "Company") with the Securities and Exchange Commission are
incorporated by reference in this Registration Statement and shall be deemed to
be a part hereof from the date of filing such documents.

         (a)     The Company's Quarterly Report on Form 10-Q for the quarter
                 ended March 31, 1997 (File No. 0-22001);

         (b)     The Company's Prospectus dated February 25, 1997 filed
                 pursuant to Rule 424(b) under the Act (File No. 333-18247);

         (c)     The description of the Common Stock of the Company contained
                 in "Description of Capital Stock" in the Company's
                 Registration Statement on Form S-1 filed on February 24, 1997
                 (File No. 333-18247); and

         (d)     All reports filed by the Company pursuant to Sections 13(a),
                 13(c) and 15(d) of the Exchange Act subsequent to the date of
                 this Registration Statement and prior to the filing of a
                 post-effective amendment which indicates that all of the
                 securities offered hereby have been sold or which deregisters
                 all securities then remaining unsold.

ITEM 4. DESCRIPTION OF SECURITIES.

         Not Applicable.

ITEM 5. INTERESTS OF NAMED EXPERTS AND COUNSEL.

         Not Applicable.

ITEM 6.  INDEMNIFICATION OF OFFICERS AND DIRECTORS.

         Section 10 of the Virginia Stock Corporation Act (the "VSCA") allows
for indemnification, in certain circumstances, by a corporation of any person
threatened with or made a party to any action, suit or proceeding by reason of
the fact that he or she is, or was, a director, officer, employee or agent of
such corporation.  The Registrant's Articles of Incorporation provide for
mandatory indemnification of its directors and officers and for discretionary
indemnification of any employee or agent to the full extent permitted by the
VSCA,

                                      II-1
5
including in circumstances in which indemnification is otherwise discretionary
under the VSCA.  In addition, the Registrant  has entered into separate
indemnification agreements with its directors and officers setting forth
certain procedures and other conditions applicable to claims for
indemnification pursuant to the Company's Articles of Incorporation and
agreeing, subject to certain limitations, to obtain and maintain directors' and
officers' liability insurance coverage for its directors and officers.  These
indemnification provisions may be sufficiently broad to permit indemnification
of the Registrant's officers and directors for liabilities (including
reimbursement of expenses incurred) arising under the Securities Act of 1933,
as amended.

         INSOFAR AS INDEMNIFICATION FOR LIABILITIES ARISING UNDER THE
SECURITIES ACT MAY BE PERMITTED TO DIRECTORS, OFFICERS OR PERSONS CONTROLLING
THE COMPANY PURSUANT TO THE FOREGOING PROVISIONS, THE COMPANY HAS BEEN INFORMED
THAT IN THE OPINION OF THE SECURITIES AND EXCHANGE COMMISSION, SUCH
INDEMNIFICATION IS AGAINST PUBLIC POLICY AS EXPRESSED IN THE SECURITIES ACT AND
IS THEREFORE UNENFORCEABLE.

ITEM 7.  EXEMPTION FROM REGISTRATION CLAIMED

         Not Applicable.

ITEM 8. EXHIBITS

         5.1     Opinion of Hazel & Thomas, P.C.

         10.1    1996 Stock Option Plan filed as Exhibit 10.3 to the
                 Registrant's Registration Statement on Form S-1 (No.
                 333-18247) and incorporated herein by reference.

         10.2    1996 Employee Stock Purchase Plan filed as Exhibit 10.4 to the
                 Registrant's Registration Statement on Form S-1 (No.
                 333-18247) and incorporated herein by reference.

         23(a)   Consent of Arthur Andersen L.L.P.

         23(c)   Consent of Counsel included in Exhibit 5.1.

ITEM 9. UNDERTAKINGS

         The undersigned Registrant hereby undertakes:

         A.      Rule 415 Offering.

         1.      To file, during any period in which offers or sales are being
made, a post-effective amendment to this Registration Statement:

                                      II-2
6
                 (i)      To include any prospectus required by Section
10(a)(3) of the Securities Act of 1933.

                 (ii)     to reflect in the prospectus any facts or events
arising after the effective date of the registration statement (or the most
recent post-effective amendment thereof) which individually or in the
aggregate, represent a fundamental change in the information set forth in the
Registration Statement.

                 (iii)    To include any material information with respect to
the plan of distribution not previously disclosed in the Registration Statement
or any material change to such information in the Registration Statement.

         2.      That, for the purpose of determining any liability under the
Securities Act of 1993, each such post-effective amendment shall be deemed to
be a new Registration Statement relating to the securities offered therein, and
the offering of such securities at that time shall be deemed to be the initial
bona fide offering thereof.

         3.      To remove from registration by means of a post-effective
amendment any of the securities being registered which remain unsold at the
termination of the offering.

         B.      Subsequent Exchange Act Documents Incorporated by Reference:

         The undersigned Registrant hereby undertakes that, for purposes of
determining any liability under the Securities Act of 1993, each filing of the
issuer's annual report pursuant to Section 13(a) or Section 15(d) of the
Exchange Act, and each filing of the Purchase Plan's annual report pursuant to
Section 15(d) of the Exchange Act) that is incorporated by reference in the
Registration Statement shall be deemed to be a new Registration Statement
relating to the securities offered therein, and the offering of such securities
at that time shall be deemed to be the initial bona fide offering thereof.

         C.      Indemnification.

         1.      Insofar as indemnification for liabilities arising under the
Securities Act may be permitted to directors, officers, and controlling persons
of the Company pursuant to the foregoing provisions, or otherwise, the Company
has been advised that in the opinion of the Commission such indemnification is
against public policy as expressed in the Act and is, therefore, unenforceable.
In the event that a claim for indemnification against such liabilities (other
than the payment by the Company of expenses incurred or paid by a director,
officer, or controlling person of the Company in the successful defense of any
action, suit, or proceeding) is asserted by such director, officer, or
controlling person in connection with the securities being registered, the
Company will, unless in the opinion of its counsel the matter has been settled
by controlling precedent, submit to a court of appropriate jurisdiction the
question whether such

                                      II-3
7
indemnification by it is against public policy as expressed in the Act and will
be governed by the final adjudication of such issue.

                                      II-4
8
                                   SIGNATURES

         Pursuant to the requirements of the Securities Act of 1933, the
Company certifies that it has reasonable grounds to believe that it meets all
of the requirements for filing on Form S-8 and has duly caused this
Registration Statement to be signed on its behalf by the undersigned, thereunto
duly authorized, in the City of McLean, State of Virginia, on July 2, 1997.

                                           DELTEK SYSTEMS, INC.
                                           
                                           
                                           By: /s/ KENNETH E. DELASKI
                                               --------------------------------
                                               Kenneth E. deLaski, President
                                               and Chief Executive Officer

         Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed by the following persons in the
capacities indicated.
Signature                                          Title                                      Date
/s/ KENNETH E. DELASKI                             President, Chief Executive                July 2, 1997
-------------------------------------------        Officer and Director                          
Kenneth E. deLaski                                 

/s/ DONALD DELASKI                                 Chairman of the Board of                  July 2, 1997
-------------------------------------------        Directors and Treasurer                        
Donald deLaski                                     

/s/ EVE F. BROWN                                   Executive Vice President,                 July 2, 1997
-------------------------------------------        Technical Operations                          
Eve F. Brown                                      

/s/ ALAN R. STEWART                                Chief Financial Officer                   July 2, 1997
-------------------------------------------        and Secretary                        
Alan R. Stewart                                   

/s/ ROBERT E. GREGG                                Director                                  July 3, 1997
-------------------------------------------                
Robert E. Gregg

/s/ DARRELL J. OYER                                Director                                  July 2, 1997
-------------------------------------------                
Darrell J. Oyer
9
                               INDEX TO EXHIBITS
Exhibit No.      Title of Exhibit                                                              Page No.
----------       ----------------                                                              --------
5.1              Opinion of Hazel & Thomas, P.C.

10.1             1996 Stock Option Plan filed as Exhibit 10.3 to the Registrant's 
                 Registration Statement on Form S-1 (No. 333-18247)
                 and incorporated herein by reference.

10.2             1996 Employee Stock Purchase Plan filed as Exhibit 10.4 to the 
                 Registrant's Registration Statement on Form S-1 (No.
                 333-18247) and incorporated herein by reference.

23(a)            Consent of Arthur Andersen L.L.P.

23(c)            Consent of Counsel included in Exhibit 5.1.