SCHEDULE 14A

                                 (Rule 14a-101)

                     INFORMATION REQUIRED IN PROXY STATEMENT

                            SCHEDULE 14A INFORMATION

                Proxy Statement Pursuant to Section 14(a) of the
               Securities Exchange Act of 1934 (Amendment No.   )

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|X|  Definitive Additional Materials

                              Quality Systems, Inc.
- --------------------------------------------------------------------------------
                (Name of Registrant as Specified In Its Charter)

- --------------------------------------------------------------------------------
    (Name of Person(s) Filing Proxy Statement, if Other Than the Registrant)

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PRESS RELEASE

QUALITY SYSTEMS WINS SUPPORT FROM ISS IN PROXY CONTEST AGAINST DISSIDENT
MINORITY SLATE

ISS RECOMMENDS QSII SHAREHOLDERS VOTE "FOR" ALL OF THE COMPANY'S EIGHT DIRECTOR
NOMINEES AND COMPANY PROPOSALS

IRVINE, CA, September 15, 2005- Quality Systems, Inc. (NASDQ: QSII) today
announced that the nation's leading independent proxy advisor, Institutional
Shareholder Services, ("ISS"), has recommended that shareholders of Quality
Systems vote the WHITE proxy card FOR all management proposals at its annual
meeting to be held on September 21,2005.

In making its report detailing its recommendation, ISS concluded, "Given the
company's strong financial performance and generally sound corporate governance
practices, we do not believe that Hussein's concerns warrant the election of the
dissident slate to the board."

The Company is pleased that ISS also recognized the Company's significant
creation of shareholder value, and agrees with its determination that the
election of Hussein's minority slate of three directors is not in the best
interest of all shareholders. The Company also appreciates the support of ISS
for its three proposals to approve its stock option and incentive plan, ratify
it's independent accountants and increase its authorized common stock

In a recent letter to shareholders asking for their vote, the Company pointed to
the outstanding operating performance and market price appreciation as reasons
to vote for the Company's eight directors.

The Company strongly recommends that all shareholders vote their WHITE proxies
today. Shareholders that need assistance in voting their shares or have any
questions are invited to call MacKenzie Partners, Inc. (800)-322-2885.

At the Company's annual meeting eight directors will be elected. The Board has
nominated eight current directors and chosen not to renominate Ahmed Hussein who
is seeking to elect himself and two other persons to the board

This Solicitation is being made by the Board of Directors of Quality Systems,
Inc. Information regarding the Board as participants in the solicitation is
contained in the Definitive proxy statement of Quality Systems, Inc. on file
with the SEC. Such proxy statement may be obtained without charge from the SEC's
website at www.sec.gov and has been distributed to shareholders on or about
August 24, 2005. We urge you to read such proxy statement in full because it
contains important information about this solicitation by your Board of
Directors. Requests for copies should be directed Quality Systems Proxy
Solicitor, MacKenzie Partners, Inc. at 800-322-2885 or e-mail
proxy@mackenziepartners.com. This communication is being released on or about
September 15, 2005.

About Quality Systems

Quality Systems, Inc. and its NextGen Healthcare information Systems subsidiary
develop and market computer-based practice management, patient records, and
connectivity application for medical and dental group practices. Visit
www.qsii.com and www.nextgen.com for additional information.

Contact:
Dan Sullivan
MacKenzie Partners, Inc.
212-929-5500