SCHEDULE 14A
FILE NO. 000-22001

SCHEDULE 14A INFORMATION
PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES
EXCHANGE ACT OF 1934

[X] Filed by the Registrant

[ ] Filed by a Party other than the Registrant

Check the appropriate box:

[ ] Preliminary Proxy Statement [ ] Confidential, for Use of the
Commission Only (as permitted by
Rule 14a-6(e)(2))

[X] Definitive Proxy Statement

[ ] Definitive Additional Materials

[ ] Soliciting Material Pursuant to sec.240.14a-11(c) or sec.240.14a-12

DELTEK SYSTEMS, INC.
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(Name of Registrant As Specified in its Charter)

Payment of Filing Fee (Check the appropriate box):

[X] No fee required.

[ ] Fee computed on table below per Exchange Act Rules 14a-6(i)(4) and
0-11.

(1) Title of each class of securities to which transaction applies:

N/A
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(2) Aggregate number of securities to which transaction applies:

N/A
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(3) Per unit price or other underlying value of transaction computed
pursuant to Exchange Act Rule 0-11:

N/A
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(4) Proposed maximum aggregate value of transaction:

N/A
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(5) Total fee paid: $

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[ ] Fee paid previously with preliminary materials.

[ ] Check box if any part of the fee is offset as provided by Exchange Act
Rule 0-11(a)(2) and identify the filing for which the offsetting fee
was paid previously. Identify the previous filing by registration
statement number, or the Form or Schedule and date of its filing.

(1) Amount Previously Paid:

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(2) Form, Schedule or Registration Statement No.:

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(3) Filing Party:

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(4) Date Filed:

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[DELTEK SYSTEMS LETTERHEAD]

April 20, 2000

Dear Deltek Shareholder:

You are cordially invited to attend the 2000 Annual Meeting of Shareholders of
Deltek Systems, Inc. on Friday, May 19, 2000. The meeting will begin promptly at
10:00 a.m. local time, at the McLean Hilton, 7920 Jones Branch Drive, McLean,
Virginia.

The following items are included with this letter: (1) the official notice of
the meeting, (2) the proxy statement, (3) the proxy form, (4) the 1999 Annual
Report on Form 10-K, (5) the 1999 Annual Review, and (6) reservation request
form. The matters listed in the notice of meeting are described in detail in the
proxy statement. The Annual Report includes a financial review of Deltek's
performance in 1999.

If you plan to attend the Annual Meeting, please complete and return to us the
meeting reservation request form.

Your vote is important. Whether or not you plan to attend the Annual Meeting, I
urge you to complete, sign and date the enclosed proxy card and return it in the
accompanying envelope as soon as possible so that your stock may be represented
at the meeting.

Sincerely,

/s/ Kenneth E. deLaski

Kenneth E. deLaski
President and Chief Executive Officer
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DELTEK SYSTEMS, INC.
Principal Executive Offices:
8280 Greensboro Drive
McLean, VA 22102

NOTICE OF ANNUAL MEETING
To be held May 19, 2000

The 2000 Annual Meeting of Shareholders (the "Annual Meeting") of Deltek
Systems, Inc., a Virginia corporation (the "Company" or "Deltek"), will be held
at the McLean Hilton, 7920 Jones Branch Drive, McLean, Virginia, on Friday, May
19, 2000, at 10:00 a.m. local time, and thereafter as it may from time to time
be adjourned for the following purposes:

1. To elect two Class III Directors for three years or until their
successors have been duly elected and qualified;

2. To ratify the appointment of Arthur Andersen LLP as the Company's
independent auditors for its current fiscal year; and

To transact such other business as may properly come before the Annual
Meeting and any adjournment or postponement thereof.

Holders of record of Deltek Common Stock on April 12, 2000, are entitled to
notice of, and to vote at, the Annual Meeting. A list of shareholders entitled
to vote at the meeting will be available for inspection by shareholders of
record at the executive offices of the Company ten calendar days prior to the
meeting.

WHETHER OR NOT YOU EXPECT TO BE PRESENT AT THE ANNUAL MEETING, PLEASE DATE
AND SIGN THE ENCLOSED FORM OF PROXY AND MAIL IT PROMPTLY IN THE ENCLOSED
ENVELOPE.

By Order of the Board of Directors,

/S/ PAUL G. LEVY

Paul G. Levy
Secretary

McLean, Virginia
April 20, 2000
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DELTEK SYSTEMS, INC.
Principal Executive Offices:
8280 Greensboro Drive
McLean, VA 22102

PROXY STATEMENT

GENERAL INFORMATION

This proxy statement and the accompanying proxy card and 1999 Annual Report
are furnished in connection with the solicitation of proxies by the Board of
Directors (the "Board") of Deltek Systems, Inc. ("Deltek" or the "Company") for
the Annual Meeting of Shareholders to be held on Friday, May 19, 2000, at 10:00
a.m., or at any adjournments thereof, at the McLean Hilton, 7920 Jones Branch
Drive, McLean, Virginia (the "Annual Meeting"). These proxy materials are first
being sent to shareholders on or about April 20, 2000. Only shareholders of
record on April 12, 2000 (the "Record Date") are entitled to notice of, and to
vote at, the Annual Meeting.

VOTING OF PROXIES

Your vote is important. Shares can be voted at the Annual Meeting only if
you are present in person or represented by proxy. Even if you plan to attend
the Annual Meeting, you are urged to sign, date and return the accompanying
proxy card.

When the enclosed proxy card is properly signed, dated, and returned, the
stock represented by the proxy will be voted in accordance with your directions.
You can specify your voting instructions by marking the appropriate boxes on the
proxy card. If your proxy card is signed and returned without specific voting
instructions, your shares of Deltek Common Stock will be voted as recommended by
the directors: "FOR" the election of the nominees for director named on the
proxy card (Proposal No. 1), and "FOR" the ratification of the independent
auditors appointed by the Board (Proposal No. 2).

You may revoke your proxy at any time before it is exercised by (a)
delivering to the Company's secretary at the Company's principal executive
offices either (i) written notice of revocation of the proxy, or (ii) a duly
executed later-dated proxy, or by (b) voting by ballot at the Annual Meeting.

VOTES REQUIRED

The presence, in person or by proxy, of the holders of at least a majority
of the shares of Deltek Common Stock outstanding on the Record Date is necessary
to have a quorum for the Annual Meeting. Abstentions and broker "non-votes" are
counted as present for purposes of determining a quorum. A broker "non-vote"
occurs when a nominee holding shares of Deltek Common Stock for a beneficial
owner does not vote on a particular proposal because the nominee does not have
discretionary voting power with respect to that item and has not received
instructions from the beneficial owner. Less than a quorum may adjourn a
meeting.

As of the Record Date, 16,720,640 shares of Deltek Common Stock were
outstanding. Each shareholder is entitled to one vote on each item at the Annual
Meeting, in person or by proxy, for each share of common stock held of record by
such shareholder on the Record Date. Election of the nominees for the Board
(Proposal No. 1) will require the plurality of the votes cast by shares entitled
to vote in the election. Should either of the nominees become unavailable to
accept nomination or election as a director, the individuals named as proxies on
your proxy card will vote the shares represented by your proxy card for the
election of such other person as the Board may recommend. The Board knows of no
reason why the nominees will be unavailable or unable to serve. Ratification of
the appointment of independent auditors (Proposal No. 2) will be approved if the
votes cast favoring ratification exceed the votes cast in opposition. Proxies
solicited by the Board will be voted "FOR" each item, unless otherwise
instructed on your proxy card. Shares not voted by abstention and broker
non-votes will not be counted either for or against an item, and such
abstentions and broker non-votes will not affect the outcome of the vote on such
item.
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SOLICITATION OF PROXIES

Solicitation of proxies may be made by use of the mails and may also be
made in person or by telephone or other electronic communications. The cost of
soliciting proxies in the accompanying form will be borne by the Company. The
Company may reimburse brokerage firms and others for their expenses in
forwarding proxy materials to the beneficial owners and soliciting them to
execute the proxies.

ANNUAL MEETING ATTENDANCE

Admission to the Annual Meeting is limited to shareholders of record or
their proxy, beneficial owners of Deltek Common Stock having evidence of
ownership, and guests of Deltek. If you are a registered owner of Deltek Common
Stock and plan to attend the Annual Meeting in person, please complete and
return to Deltek's Corporate Secretary the meeting reservation request form
printed on the back of this proxy statement. Shareholders who have not obtained
a reservation for the Annual Meeting will be admitted upon verification of
ownership at the Annual Meeting. Results of the Annual Meeting will be included
in Deltek's next quarterly report filed with the Securities and Exchange
Commission.

PROCEDURE FOR SHAREHOLDER PROPOSALS AND NOMINATIONS

The Board currently performs the functions of a nominating committee and
will consider director nominees recommended by shareholders for election at an
annual meeting, in accordance with the procedures set forth in the Company's
Bylaws. Under the Bylaws, written notice of a shareholder's intent to make such
a nomination generally must be received at the Company's principal executive
offices not less than 120 calendar days in advance of the date that the
Company's proxy statement was released to the shareholders in connection with
the previous year's annual meeting of shareholders. The notice must contain the
information required by the Company's Bylaws.

The Bylaws also provide that no business shall be conducted at any meeting
of shareholders unless specified in the notice of the meeting (or any supplement
thereto) by or at the direction of the Board, otherwise brought before the
meeting by or at the direction of the Board, or properly brought before the
meeting by a shareholder of the Company who complies with certain notice
procedures set forth in the Bylaws. These requirements are separate and apart
from, and in addition to, the Securities and Exchange Commission's requirements
for the inclusion of a shareholder's proposal in the Company's proxy statement.

Proposals of shareholders intended to be presented at the 2001 Annual
Meeting must be received by the Company's Corporate Secretary at the Company's
principal executive offices no later than December 1, 2000, for inclusion in the
Company's proxy statement and form of proxy relating to that meeting. Such
proposals must also meet the requirements set forth in the rules and regulations
of the Securities and Exchange Commission in order to be eligible for inclusion
in the Company's 2001 proxy materials.

The Company's Bylaws are incorporated herein by this reference. A copy of
the Bylaws may be obtained by following the instructions set forth on the last
page of this proxy statement.

DISSENTERS' RIGHTS OF APPRAISAL

The Board has not proposed any action for which the laws of the State of
Virginia, the Certificate of Incorporation or Bylaws of the Company provide a
right of a shareholder to dissent and obtain payment for shares.

OTHER MATTERS TO COME BEFORE THE ANNUAL MEETING

The Board does not know of any matters which will be brought before the
Annual Meeting other than those specifically set forth in the notice of meeting
and this proxy statement. If any other matters are properly introduced at the
Annual Meeting for consideration, including, among other things, consideration
of a motion to adjourn the meeting to another time or place, the individuals
named on the proxy card will vote in accordance with their best judgment.

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PROPOSAL 1
TO ELECT TWO CLASS III DIRECTORS
EACH TO SERVE FOR THREE YEARS OR UNTIL HIS
SUCCESSOR HAS BEEN DULY ELECTED AND QUALIFIED

The Company's Board currently consists of five persons. The Company's
Articles of Incorporation and Bylaws provide that, commencing with the 1997
Annual Meeting of Shareholders, the Board shall be divided into three classes
with each class containing one third of the total number of directors, as nearly
equal in number as possible. Our directors, the class to which they were elected
and the expiration dates of their positions are as follows:

NAME CLASS TEAM EXPIRING
---- --------- -------------

Charles W. Stein.................... Class I 2001 Annual Meeting
Donald deLaski...................... Class II 2002 Annual Meeting
Darrell J. Oyer..................... Class II 2002 Annual Meeting
Kenneth E. deLaski.................. Class III 2000 Annual Meeting
Robert E. Gregg..................... Class III 2000 Annual Meeting

The Board has concluded that the re-election of Kenneth E. deLaski and
Robert E. Gregg as Class III directors is in the best interest of the Company
and recommends approval of their election. Biographical information concerning
Messrs. deLaski and Gregg can be found under "Executive Officers and Directors."
The remaining directors will continue to serve in their positions for the
remainder of their terms.

EXECUTIVE OFFICERS AND DIRECTORS

The Company's executive officers and directors are as follows:

NAME AGE POSITION
---- --- --------

Kenneth E. deLaski.................... 42 President, Chief Executive Officer,
Director, and Class III Director
Nominee
Donald deLaski........................ 68 Chairman of the Board of Directors
David L. Spilman...................... 57 Senior Vice President, Finance and
Administration and Chief Financial
Officer
Robert E. Gregg....................... 52 Director and Class III Director
Nominee
Darrell J. Oyer....................... 59 Director
Charles W. Stein...................... 59 Director

Kenneth E. deLaski was a co-founder of the Company in November 1983 and has
served as a director of the Company since its inception. Mr. deLaski also has
served as the Company's President since May 1990 and as its Chief Executive
Officer since February 1996. From May 1990 to February 1996, he served as the
Company's Chief Operating Officer. Mr. deLaski is a certified public accountant.
He is the son of Donald deLaski, Chairman of the Board of Directors. Mr. deLaski
has been nominated for re-election as a Class III Director.

Donald deLaski was a co-founder of the Company in November 1983 and has
served as Chairman of the Board of Directors since its inception. Mr. deLaski
also served as the Company's Chief Executive Officer from its inception until
February 1996, and as its Treasurer until July 1999. Mr. deLaski is a certified
public accountant. He is the father of Kenneth E. deLaski, President and Chief
Executive Officer of the Company.

David L. Spilman was appointed to his position effective March 6, 2000 and
has over 30 years of financial management experience in the public company
environment, most recently as Senior Vice President and Chief Financial Officer
of Farmer's & Mechanics National Bank, Frederick, Maryland. Mr. Spilman is a
certified public accountant and past president of the Maryland Association of
CPAs.

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Robert E. Gregg has served as a director of the Company since September
1986. Mr. Gregg has been a partner in Reed Smith Hazel & Thomas LLP, counsel to
the Company, since the merger in November 1999 of Reed Smith Shaw & McClay, LLP
and Hazel & Thomas, PC, where he has been a shareholder since Hazel & Thomas'
inception in 1987. Mr. Gregg has been nominated for re-election as a Class III
Director.

Darrell J. Oyer became a director of the Company in February 1997. Since
June 1991, Mr. Oyer has served as President of Darrell J. Oyer and Company, a
consulting company. Mr. Oyer was previously a partner with Deloitte and Touche
and was previously the Assistant Director of several functional areas of the
Defense Contract Audit Agency.

Charles W. Stein became a director of the Company on April 1, 1997. Since
August 1997, Mr. Stein has served as president of Stein Venture Management, a
consulting firm. From February 1987 until January 1997, Mr. Stein served as
President and Chief Executive Officer of Netrix Corporation, a wide area network
product and systems company. Mr. Stein also was a director of Netrix Corporation
and its Chairman until he resigned from the board of directors on March 31,
1997.

Deltek's executive officers are appointed annually by, and serve at the
discretion of, the Board of Directors. Each executive officer is a full-time
employee of the Company. Other than the relationship between Donald deLaski and
Kenneth E. deLaski described herein, there are no family relationships between
any director or executive officer of the Company.

THE BOARD OF DIRECTORS

The Board is responsible for overseeing the overall performance of the
Company. Members of the Board are kept informed of the Company's business
through discussions with the President and other members of the Company's
management and staff, by reviewing materials provided to them and by
participating in Board and committee meetings. During 1999, the Board met ten
times.

COMMITTEES OF THE BOARD

The Company has audit and compensation committees, but not a nominating
committee, of the Board. The Audit Committee is responsible for reviewing with
management the financial controls, accounting, credit and reporting activities
of the Company. The Audit Committee reviews the qualifications of the Company's
independent auditors, makes recommendations to the Board regarding the selection
of independent auditors, reviews the scope, fees and results of any audit, and
reviews non-audit services and related fees provided by the independent
auditors. The members of the Audit Committee are Darrell J. Oyer and Charles W.
Stein, both of whom are independent directors. Two meetings were held during the
last fiscal year.

The Compensation Committee is responsible for the administration of all
salary and incentive compensation plans for the officers and key employees of
the Company, including bonuses. The Compensation Committee may also administer
the Company's 1996 Stock Option Plan and 1996 Employee Stock Purchase Plan. The
members of the Compensation Committee are Darrell J. Oyer and Charles W. Stein,
both of whom are independent directors. The Compensation Committee met one time
during the last fiscal year.

COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION

The Company has no interlocking relationships or other transactions
involving any of its Compensation Committee members that are required to be
reported by the Securities and Exchange Commission rules, and no current or
former officer of the Company serves on its Compensation Committee.

DIRECTOR COMPENSATION

Directors who are not employees of the Company receive $1,000 for each
meeting of the Board or any committee thereof attended in person and $500 for
each such meeting attended telephonically, except that if a committee meeting is
held on the same day as a meeting of the full Board, the compensation for
attendance at such committee meeting is $300. The Company reimburses outside
directors for any travel expenses incurred in connection with attending Board or
committee meetings. Each of the outside directors has been granted
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nonqualified options under the Company's 1996 Stock Option Plan to purchase
8,000 shares of the Company's Common Stock at prices ranging from $8.875 to
$11.00 per share. Directors who are employees of the Company will receive no
additional cash compensation for their services as members of the Board of
Directors or committees thereof other than reimbursement for travel expenses
incurred in connection with attending Board and committee meetings.

EXECUTIVE COMPENSATION

Summary Compensation Information

The following table sets forth information concerning the compensation
earned during the years ended December 31, 1997, 1998 and 1999 by the Company's
Chief Executive Officer and each of the Company's other most highly compensated
executive officers, including those who were serving as executive officers at
December 31, 1999 (collectively, the "Named Executive Officers"):

LONG-TERM COMPENSATION
--------------------------------------
ANNUAL COMPENSATION AWARDS PAYOUTS
---------------------------------------------- ------------------------- ----------
SECURITIES
OTHER RESTRICTED UNDERLYING
NAME AND ANNUAL STOCK OPTIONS/ LTIP
PRINCIPAL POSITION YEAR SALARY($) BONUS($) COMPENSATION($) AWARDS($)(1) SARS(#) PAYOUTS(#)
------------------ ---- ---------- -------- --------------- ------------ ---------- ----------

Kenneth E. deLaski,.... 1999 185,000 -- -- -- -- --
President and Chief 1998 179,042 -- -- -- -- --
Executive Officer 1997 161,413 -- -- -- -- --
Donald deLaski,........ 1999 60,000 -- -- -- -- --
Chairman 1998 71,667 -- -- -- -- --
1997 109,198 -- -- -- -- --
Eric F. Brown.......... 1999 168,914 -- 130,500(3) -- 8,000 --
Executive Vice 1998 150,125 -- -- -- 10,000 --
President and Chief 1997 132,813 -- -- -- -- --
Operating Officer(4)
G. Bryan Fleming....... 1999 124,238 -- -- -- 4,000 --
Acting Chief Financial 1998 109,750 -- -- -- -- --
Officer and 1997 99,328 -- 16,007(3) -- 3,000 --
Controller(5)

NAME AND ALL OTHER
PRINCIPAL POSITION COMPENSATION($)(2)
------------------ ------------------

Kenneth E. deLaski,.... 4,000
President and Chief 4,000
Executive Officer 4,000
Donald deLaski,........ 2,400
Chairman 2,867
4,000
Eric F. Brown.......... 4,000
Executive Vice 4,000
President and Chief 4,000
Operating Officer(4)
G. Bryan Fleming....... 4,000
Acting Chief Financial 4,000
Officer and 3,973
Controller(5)

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(1) The Named Executive Officer did not hold restricted stock awards as of the
end of the fiscal year. The number and value of the aggregate restricted
stock holdings for Messrs. K. deLaski, D. deLaski, Brown, and Fleming at the
end of the last fiscal year, based on the closing bid price of the Company's
Common Stock on the Nasdaq National Market on December 31, 1999, were
4,602,800, 3,514,700, 309,200, and 8,367 shares, respectively, with values
of $62,137,800, $47,448,450, $4,174,200 and $112,955, respectively, without
giving effect to the consideration paid by the Named Executive Officer.

(2) Does not include pro rata distributions of S Corporation dividends to the
individual as a shareholder. Includes for 1997, 1998 and 1999 a 401(k) plan
profit sharing contribution of $4,000 for Messrs. K. deLaski and E. Brown,
for Mr. D. deLaski, a 401(k) plan profit sharing contribution of $4,000 for
1997 and 1998, and $2,400 for 1999, and for Mr. G.B. Fleming a 401(k) profit
sharing contribution of $3,973 for 1997, and $4,000 for 1998 and 1999. Does
not include other perquisites and personal benefits the aggregate amount of
which did not exceed 10% of the total annual salary and bonus reported for
the Named Executive Officer.

(3) Represents the dollar value of non-cash compensation from the exercise of
options to convert to Common Stock during the fiscal year.

(4) Mr. Brown resigned as an officer of and terminated his employment by the
Company on December 10, 1999.

(5) Mr. Fleming was named Controller in April 1999 and was Acting Chief
Financial Officer from July 23, 1999 until March 6, 2000. Prior to April
1999, Mr. Fleming was a Senior System Consultant with the Company.

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Option Grants in Last Fiscal Year

The following table sets forth information concerning grants of options to
purchase the Company's Common Stock made during the year ended December 31, 1999
to the Named Executive Officers.

INDIVIDUAL GRANTS
---------------------------------------------------- POTENTIAL
REALIZABLE
VALUE AT
ASSUMED
ANNUAL RATES OF
NUMBER OF % OF TOTAL STOCK PRICE
SHARES OPTIONS APPRECIATION FOR
UNDERLYING GRANTED TO EXERCISE OPTION TERM(2)
OPTIONS EMPLOYEES IN PRICE PER EXPIRATION ----------------------
NAME GRANTED FISCAL YEAR(1) SHARE DATE 5% 10%
---- ---------- -------------- --------- ---------- -------- --------

Kenneth E. deLaski........................... -- -- -- -- -- --
Donald deLaski............................... -- -- -- -- -- --
Eric F. Brown................................ 8,000 2.82% $ 8.750 05/20/09(3) (3) (3)
G. Bryan Fleming............................. 4,000 1.41% $15.125 08/31/09 38,048 96,421

- ---------------
(1) The Company granted options to purchase an aggregate of 283,610 shares of
the Company's Common Stock to employees during the year ended December 31,
1999.

(2) The potential realizable value is based on the term of the option at the
time of grant (ten years). Potential gains are net of the exercise price but
before taxes associated with the exercise. Amounts represent hypothetical
gains that could be achieved for the respective options if exercised at the
end of the option term. The assumed 5% and 10% rates of stock price
appreciation are provided in accordance with the rules of the Securities and
Exchange Commission and do not represent the Company's estimate or
projection of the future common stock price. Actual gains, if any, on stock
option exercises are dependant on the future financial performance of the
Company, overall market conditions and the option holders' continued
employment through the vesting period. This table does not take into account
any appreciation in the price of the common stock from the date of grant to
the date hereof.

(3) Mr. Brown resigned on December 10, 1999. Unvested options were cancelled as
of that date.

Option Exercises and 1999 Fiscal Year-End Option Values

The following table sets forth information concerning the exercise of stock
options during the year ended December 31, 1999 and the value of options held as
of such date by the Named Executive Officers:

NUMBER OF SECURITIES VALUE OF UNEXERCISED
NUMBER OF UNDERLYING UNEXERCISED IN-THE-MONEY OPTIONS AT
SHARES OPTIONS AT DECEMBER 31, 1999 DECEMBER 31, 1999(2)
ACQUIRED VALUE ----------------------------- ---------------------------
NAME UPON EXERCISE RECEIVED(1) EXERCISABLE UNEXERCISABLE EXERCISABLE UNEXERCISABLE
---- ------------- ----------- ------------ -------------- ----------- -------------

Kenneth E. deLaski... -- -- -- -- -- --
Donald deLaski....... -- -- -- -- -- --
Eric F. Brown........ 18,000 130,500 -- (3) -- (3)
G. Bryan Fleming..... -- -- 7,800 8,200 73,371 22,800

- ---------------
(1) "Value Received" represents the fair market value of the underlying common
stock on the exercise date minus the aggregate exercise price of such
options.

(2) Based upon the closing bid price on Nasdaq of the Company's common stock as
of December 31, 1999 of $13.50 per share, minus the aggregate exercise price
of such options.

(3) Mr. Brown resigned on December 10, 1999. Unvested options were cancelled as
of that date.

1996 Stock Option Plan

Deltek's 1996 Stock Option Plan (the "1996 Option Plan") was adopted by the
Company's Board in November 1996 and approved by the Company's shareholders in
December 1996. A total of 2,100,000 shares of Common Stock have been reserved
for issuance under the 1996 Option Plan. The 1996 Option Plan is

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administered by the Board or a committee thereof. The 1996 Option Plan provides
for grants of "incentive stock options," within the meaning of Section 422 of
the Code, to employees (including officers and employee directors), and for
grants of nonstatutory options to employees, non-employee directors and
consultants. The 1996 Option Plan will terminate in December 2006, unless
terminated sooner by the Board.

The exercise price of stock options granted under the 1996 Option Plan must
be not less than the fair market value of the common stock on the date of grant.
With respect to any optionee who owns stock representing more than 10% of the
voting power of all classes of the Company's outstanding capital stock, the
exercise price of any incentive stock option must be equal to at least 110% of
the fair market value of the common stock on the date of grant, and the term of
the option must not exceed five years. The terms of all other options may not
exceed ten years. The aggregate fair market value of Common Stock (determined as
of the date of the option grant) for which an incentive stock option may for the
first time become exercisable in any calendar year may not exceed $100,000. The
Board or any committee administering the 1996 Option Plan has discretion to
determine exercise schedules and vesting requirements, if any, of all option
grants under the 1996 Option Plan.

As of December 31, 1999, options to purchase an aggregate of 997,001 shares
were outstanding under the 1996 Option Plan, at exercise prices ranging from
$8.00 per share to $18.687 per share and 200,060 options were exercisable as of
December 31, 1999. In 1999, options totaling 20,000 shares were granted to
current executive officers as a group under the Plan, and options totaling
263,610 shares were granted under the Plan to all employees (excluding executive
officers) as a group. Options generally become exercisable in five annual
installments beginning one year after the date of the option grant.

Employee Time Accelerated Stock Option Plan

Deltek's Time Accelerated Stock Option Plan (the "Accelerated Plan") was
adopted by the Company's Board and approved by its shareholders in April 1996. A
total of 1,500,000 shares of Common Stock originally were reserved for issuance
under the Accelerated Plan. In December 1996, the Company's Board reduced the
number of shares of Common Stock reserved for issuance under the Accelerated
Plan to 679,500, the number of shares of Common Stock issuable upon the exercise
of options then outstanding. The Accelerated Plan provides for grants of
nonstatutory options to key employees of the Company. The Accelerated Plan was
discontinued at the time of the adoption of the 1996 Option Plan, and no
additional options will be granted under the Accelerated Plan. Options
previously granted under the Accelerated Plan will continue to be governed by
the terms of the Accelerated Plan, which will be administered by the Board.

The exercise price of options granted under the Accelerated Plan must be
not less than the fair market value of the Common Stock on the date of grant.
The term of options granted under the Accelerated Plan is ten years, subject to
certain exceptions. All of the options granted under the Accelerated Plan become
exercisable on January 1, 2004. Any options that are fully vested at the time an
optionee's employment with the Company terminates for any reason (other than
death, disability or retirement) terminate three months after the date of
termination unless earlier exercised.

As of December 31, 1999, options to purchase 330,950 shares of Common
Stock, at a weighted average exercise price of $4.00 per share, were outstanding
under the Accelerated Plan and 151,550 of such options were exercisable.

1987 Employee Stock Option Plan

Deltek's 1987 Employee Stock Option Plan (the "1987 Option Plan") was
adopted by the Company's Board and approved by its shareholders in December
1987. A total of 900,000 shares of Common Stock originally were reserved for
issuance under the 1987 Option Plan. In December 1996, the Company's Board
reduced the number of shares of Common Stock reserved for issuance under the
1987 Option Plan to 388,500, the number of shares of Common Stock issuable upon
the exercise of options outstanding as of September 30, 1996. The 1987 Option
Plan provided for grants of nonstatutory options to key employees of the
Company. The 1987 Option Plan was discontinued at the time of the adoption of
the 1996 Option Plan, and no additional

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options will be granted under the 1987 Option Plan. Options previously granted
under the 1987 Option Plan will continue to be governed by the terms of the 1987
Option Plan, which will be administered by the Board.

The exercise price of options granted under the 1987 Option Plan is based
on the book value of the common stock at the end of the fiscal year immediately
prior to the year in which the option is granted, as reflected in the Company's
audited financial statements, reduced by any dividend declared by the Company
with respect to the previous fiscal year. The term of options granted under the
1987 Option Plan is ten years, subject to certain exceptions. Generally, options
granted under the 1987 Option Plan become exercisable pursuant to a five-year
vesting schedule provided the optionee remains employed full time by the Company
and are subject to a right of repurchase by the Company upon the termination of
the optionee's employment.

As of December 31, 1999, options to purchase 111,950 shares of Common
Stock, at a weighted average exercise price of $0.396 per share, were
outstanding under the 1987 Option Plan. Options to purchase 111,050 shares were
fully vested and exercisable as of December 31, 1999.

1996 Employee Stock Purchase Plan

Deltek's 1996 Employee Stock Purchase Plan (the "Purchase Plan") was
adopted by the Company's Board in November 1996 and approved by its shareholders
in December 1996. A total of 400,000 shares of Common Stock are reserved for
issuance under the Purchase Plan. The Purchase Plan, which is intended to
qualify under Section 423 of the Code, is administered by the Board or a
committee thereof. Employees (including officers and employee directors of the
Company) are eligible to participate in the Purchase Plan if they are
customarily employed for more than 20 hours per week five months per year. The
Purchase Plan permits eligible employees to purchase Common Stock through
payroll deductions, which may not exceed 10% of an employee's compensation. The
price at which stock may be purchased under the Purchase Plan is equal to 85% of
the lower of the fair market value of the common stock on the first day of the
offering period or the last day of the offering period. Employees may end their
participation in the offering at any time during the offering period, and
participation ends automatically on termination of a participant's employment
with the Company. In addition, participants may not purchase shares of Common
Stock having a value (measured at the beginning of the offering period) greater
than $25,000 in any calendar year.

As of December 31, 1999, 118,018 shares of Common Stock have been issued
under the Purchase Plan.

8
12

Performance Graph

COMPARISON OF CUMULATIVE TOTAL RETURN* AMONG
DELTEK SYSTEMS, S&P 500, PEER GROUP AND S&P SMALLCAP 600
LINE GRAPH

DELTEK SYSTEMS S&P 500 PEER GROUP S&P SMALLCAP 600
-------------- ------- ---------- ----------------

2/97 $100.00 $100.00 $100.00 $100.00
12/97 143.75 125.52 93.80 123.53
12/98 153.41 161.39 68.23 121.92
12/99 122.73 195.35 125.09 137.04

Assumes initial investment of $100

* Total Return assumes reinvestment of dividends
Note: Total Returns based on market capitalization

The above graph assumes a $100 investment on February 20, 1997 and
reinvestment of all dividends, in the Company's Common Stock, the S&P 600 Index,
and a composite peer group consisting of the following companies: Aspen
Technology, Inc., J.D. Edwards & Co., HNC Software Inc., Infinium Software,
Inc., JDA Software Group, Inc., Lightbridge, Inc., Manugistics Group, Inc.,
Pegasus Systems, Inc., Project Software & Development, Inc., Remedy Corp., Symix
Systems, Inc., and The Vantive Corp.

SECTION 16(a) BENEFICIAL OWNERSHIP REPORTING COMPLIANCE

Section 16(a) of the Securities Exchange Act of 1934, as amended, requires
the Company's officers and directors, and persons who own more than ten percent
of a registered class of the Company's equity securities, to file reports of
ownership and changes in ownership of equity securities of the Company with the
Securities and Exchange Commission and Nasdaq National Market. Officers,
directors and greater than ten percent stockholders are required by Securities
and Exchange Commission regulation to furnish the Company with copies of all
Section 16(a) forms that they file.

Based solely upon a review of Forms 3 and 4 furnished to the Company during
its most recent fiscal year and Forms 5 furnished to the Company with respect to
its most recent fiscal year, as well as written representations of each
reporting person, all reporting persons satisfied the reporting requirements.

9
13

CERTAIN TRANSACTIONS

From 1987 until February 25, 1997 (the "Termination Date"), Deltek elected
to be treated for federal and certain state income tax purposes as an S
Corporation under Subchapter S of the Internal Revenue Code of 1986. As a
result, the Company's earnings for prior tax years and through February 24, 1996
were taxed, with certain exceptions, for federal and certain state income tax
purposes, directly to Deltek's shareholders. Prior to its initial public
offering, Deltek and its pre-IPO shareholders entered into a Tax Indemnification
Agreement, which generally provides that those shareholders will be responsible
for any federal and certain state income taxes imposed upon the Company for all
taxable periods ending prior to the Termination Date and that the Company will
be responsible for all federal and state income taxes arising on or after the
Termination Date. All executive officers and directors (other than Messrs.
Gregg, Oyer and Stein who were not shareholders prior to the initial public
offering) executed the Tax Indemnification Agreement.

Robert E. Gregg, a director of the Company, is a partner in Reed Smith
Hazel & Thomas LLP, a law firm that the Company has retained. The legal fees
paid to Reed Smith Hazel & Thomas by the Company did not exceed 5% of Reed Smith
Hazel & Thomas' gross revenues during the firm's last full fiscal year.

The Company has entered into indemnification agreements with certain of its
executive officers and directors setting forth certain procedures and other
conditions applicable for 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.

COMPENSATION COMMITTEE REPORT ON EXECUTIVE COMPENSATION

During its fiscal year ended December 31, 1999, the Company's decisions on
executive officer compensation were made in an effort to attract and retain
highly qualified personnel and to recognize individual performance through the
use of incentives, including equity-based incentives, that reward the creation
of shareholder value and the achievement of key Company objectives.

EXECUTIVE COMPENSATION POLICY

The executive compensation policy of the Compensation Committee is to offer
compensation to its executive officers in such forms and at such levels that
will attract, retain, and motivate the management talent that is necessary for
the Company's continued success, and to create incentives for executive officers
to continuously improve the Company's financial performance, customer
satisfaction, and shareholder value.

To implement this policy, the Compensation Committee believes that the
compensation of the Company's executive officers should be competitive in
relation to similar software companies and closely related to both personal and
Company performance. The Compensation Committee also believes that compensation
should include components, such as stock options, designed to align the
interests of executive officers and shareholders.

As part of its executive compensation policy, the Compensation Committee
reviews executive compensation, including that of its Chief Executive Officer,
in light of its relationship to corporate performance. The Compensation
Committee considers measures of corporate performance including software sales,
earnings per share, and the trading price of the Company's Common Stock.

ROLE OF THE COMPENSATION COMMITTEE

Consistent with past practices, the Company's Chairman, Donald deLaski, and
President, Kenneth E. deLaski, reviewed the performance of the Company's senior
management and recommended to the Compensation Committee specific adjustment to
their compensation. The Compensation Committee considered the salary changes as
recommended by the Chairman and President, taking into account the Company's
interest in attracting, retaining, and motivating the management and
technological talent that is crucial to the Company's success, as well as the
performance of the Company and the personal performance of each of the foregoing
officers and key employees. The Compensation Committee also considered the fact
that the

10
14

Company had historically used stock options to supplement salaries and would
continue to use options to compensate and motivate managers. The Committee found
that the proposed salary adjustments were reasonable and appropriate, including
maintaining, at the 1998 compensation level, the base salary for Kenneth
deLaski, President and Chief Executive Officer, at $185,000 per annum, and the
base salary for Donald deLaski, Chairman of the Board, at $60,000 per annum, as
both own substantial amounts of stock and the Committee having been advised by
the President that his personal salary was not critical as motivation because of
his stock ownership. The Compensation Committee therefore recommended that the
Board of Directors ratify, confirm and approve the foregoing salary adjustments.

The Compensation Committee:

Darrell J. Oyer
Charles W. Stein

PROPOSAL 2
TO RATIFY APPOINTMENT OF ARTHUR ANDERSEN LLP
AS THE COMPANY'S INDEPENDENT AUDITORS
FOR ITS CURRENT FISCAL YEAR

Subject to ratification by the shareholders, the Board has reappointed
Arthur Andersen LLP as independent accountants to audit the consolidated
financial statements of the Company for its fiscal year ending 2000. The Board
recommends a vote in favor of ratification of the reappointment of Arthur
Andersen LLP.

Arthur Andersen LLP has served as the Company's independent accountants to
audit the financial statements of the Company for over 10 years. Representatives
from Arthur Andersen LLP are expected to be present at the Annual Meeting, and
they will have the opportunity to make a statement if they desire to do so and
are expected to be available to respond to appropriate questions.

The ratification of independent accountants is not a matter required to be
submitted to a vote of the shareholders; however, the Company believes that
shareholder ratification may provide the auditors with a greater degree of
independence from management. In the event of a negative vote by the
shareholders, the Board would reconsider the reappointment of Arthur Andersen
LLP.

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15

VOTING SECURITIES AND PRINCIPAL HOLDERS THEREOF

The following table contains information regarding the beneficial ownership
of the Company's common stock as of the Record Date by (i) each person known by
the Company to own beneficially 5% or more of the common stock, (ii) each of the
Company's Named Executive Officers, (iii) directors and director nominees, and
(iv) executive officers and directors as a group:

NAME OF AMOUNT AND NATURE OF
TITLE OF CLASS BENEFICIAL OWNER BENEFICIAL OWNERSHIP(1) PERCENT OF CLASS
- -------------- ---------------- ----------------------- ----------------

Common Stock Kenneth E. deLaski 4,602,800(2) 27.53
Common Stock Donald deLaski 3,155,700(3) 18.87
Common Stock Robert E. Gregg 6,000(4) *
Common Stock Darrell J. Oyer 8,819(4)(5) *
Common Stock David L. Spilman -- *
Common Stock Charles W. Stein 8,350(4) *
Common Stock William Blair & Company L.L.C. 1,432,481(6) 8.57
Common Stock Brown Brothers Harriman 901,100(7) 5.39
Common Stock All directors, director nominees 7,781,669 46.54
and executive officers as a group
(6 persons)

- ---------------
* Represents less than one percent.

(1) Unless otherwise indicated and subject to community property laws where
applicable, the persons named in this table have sole voting and sole
investment power with respect to the shares shown as beneficially owned by
them. Beneficial ownership is determined in accordance with Rule 13d-3 under
the Exchange Act.

(2) Includes 40,300 shares held by various trusts for which Kenneth E. deLaski
and his spouse serve as the trustees and 926,250 shares held of record or
beneficially by Kenneth E. deLaski's spouse, Tena R. deLaski. Excludes
178,000 shares held by a foundation established by Kenneth E. deLaski for
which Kenneth E. deLaski and his spouse serve as the directors and officers.
Mr. deLaski disclaims beneficial ownership of such shares.

(3) Excludes 496,000 shares held by a foundation established by Donald deLaski
for which Donald deLaski and his spouse serve as the directors and officers.
Mr. deLaski disclaims beneficial ownership of such shares.

(4) Includes 6,000 shares issuable upon exercise of vested options and excludes
2,000 shares issuable upon exercise of unvested options.

(5) Includes 319 shares owned by Mr. Oyer's spouse. Mr. Oyer's shares are held
in a pension trust for which he serves as trustee.

(6) As reported on Schedule 13G filed by William Blair & Company, L.L.C. on
February 28, 2000. According to such Schedule 13G, William Blair & Company,
L.L.C. has sole voting power with respect to 317,500 of these shares, and
sole dispositive power with respect to all 1,432,481 of these shares. The
address of this stockholder is 222 West Adams Street, Chicago, IL 60606.

(7) As reported on Schedule 13G filed by Brown Brothers Harriman on April 10,
2000. According to such Schedule 13G, Brown Brothers Harriman has sole
voting power with respect to none of these shares, and sole dispositive
power with respect to none of these shares. The address of this stockholder
is 59 Wall Street, New York, NY 10005.

THE COMPANY'S BYLAWS ARE INCORPORATED INTO THIS PROXY STATEMENT BY REFERENCE.
THE COMPANY WILL SEND, WITHOUT CHARGE, TO EACH PERSON TO WHOM THIS PROXY
STATEMENT IS DELIVERED, UPON WRITTEN OR ORAL REQUEST OF SUCH PERSON, A COPY OF
THE COMPANY'S BYLAWS WITHIN ONE BUSINESS DAY OF THE RECEIPT OF SUCH REQUEST, BY
FIRST CLASS MAIL OR EQUALLY PROMPT MEANS. ANY SUCH REQUEST SHOULD BE DIRECTED TO
THE COMPANY'S INVESTOR RELATIONS DEPARTMENT AT THE COMPANY'S PRINCIPAL EXECUTIVE
OFFICE, 8280 GREENSBORO DRIVE, MCLEAN, VA 22102, (703) 734-8606.

PUBLICATIONS OF INTEREST TO DELTEK SHAREHOLDERS ARE AVAILABLE FREE OF CHARGE.
THESE INCLUDE ANNUAL AND QUARTERLY REPORTS TO SHAREHOLDERS, AS WELL AS OTHER
REPORTS, OTHER THAN EXHIBITS FILED THEREWITH, FILED WITH THE SECURITIES AND
EXCHANGE COMMISSION. THIS MATERIAL MAY BE OBTAINED BY WRITTEN REQUEST TO THE
COMPANY'S INVESTOR RELATIONS DEPARTMENT SENT TO THE COMPANY'S PRINCIPAL
EXECUTIVE OFFICE.

12
16

DELTEK SYSTEMS, INC.

2000 ANNUAL SHAREHOLDERS MEETING
RESERVATION REQUEST FORM

Detach Here ||
\/

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

Complete the following information and return it to Corporate Secretary, Deltek
Systems, Inc., 8280 Greensboro Drive, McLean, VA 22102, for admission to the
2000 Annual Meeting of Shareholders of Deltek Systems, Inc.

Shareholder's Name and Address:
---------------------------------------
------------------------------------------------------------------------
------------------------------------------------------------------------

Number of Shares of Deltek
Common Stock held:
------------------------------------------------------

If the shares listed above are not registered in your name, identify the
name of the shareholder of record below and bring with you to the Annual Meeting
evidence that you beneficially own the shares.

Shareholder of Record:
--------------------------------------------------

THIS IS NOT A PROXY CARD

DLTK-PS-00
17
DETACH HERE

ANNUAL MEETING OF SHAREHOLDERS OF

DELTEK SYSTEMS, INC.

ON MAY 19, 2000

THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS

The undersigned hereby appoints Kenneth E. deLaski, Donald deLaski and
Darrell J. Oyer, and each of them, proxies, with power of substitution, to vote
all shares of the undersigned at the Annual Meeting of Shareholders of Deltek
Systems, Inc., a Virginia corporation (the "Company"), to be held on May 19,
2000 at 10:00 a.m. at the McLean Hilton, 7920 Jones Branch Drive, McLean,
Virginia, or at any adjournment thereof, upon the matters set forth in the Proxy
Statement for such meeting, and in their discretion, upon such other business as
may properly come before the Annual Meeting.

CONTINUED AND TO BE SIGNED ON REVERSE SIDE

- ----------- -----------
SEE REVERSE SEE REVERSE
SIDE SIDE
- ----------- -----------

DETACH HERE

[X] PLEASE MARK
VOTES AS IN ______
THIS EXAMPLE. |
|
|
THE SHARES REPRESENTED BY ALL PROXIES RECEIVED WILL BE VOTED IN ACCORDANCE WITH THE CHOICES SPECIFIED ON SUCH PROXIES. THE SHARES
REPRESENTED BY A PROXY WILL BE VOTED IN FAVOR OF A PROPOSAL IF NO CONTRARY SPECIFICATION IS MADE. ALL VALID PROXIES OBTAINED WILL
BE VOTED AT THE DISCRETION OF THE BOARD OF DIRECTORS WITH RESPECT TO ANY OTHER BUSINESS THAT MAY COME BEFORE THE ANNUAL MEETING.

FOR AGAINST ABSTAIN
1. To elect two Class III Directors to serve for three years or until 2. To ratify the appointment [ ] [ ] [ ]
their successors have been duly elected and shall qualify. of Arthur Andersen LLP as
NOMINEES: (01) Kenneth E. deLaski and (02) Robert E. Gregg the Company's Independent
auditors for its current
FOR WITHHELD fiscal year.
[ ] [ ]

[ ]
----------------------------------------
For all nominees except as noted above

MARK HERE FOR ADDRESS CHANGE AND NOTE AT LEFT [ ]

NOTE: When shares are held by joint tenants, both should
sign. Persons signing as Executor, Administrator,
Trustee, etc. should so indicate. Please sign exactly as
the name appears on the proxy.

PLEASE MARK, SIGN AND RETURN THIS PROXY CARD PROMPTLY
USING THE ENCLOSED ENVELOPE.

Signature:___________________________________________ Date: ________ Signature:_____________________________________ Date: ________