EXHIBIT 5

                       (Letterhead of Rutan & Tucker, LLP)

                                November 15, 2005

Quality Systems, Inc.
18191 Von Karman Avenue, Suite 450
Irvine, CA  92612

Ladies and Gentlemen:

      At your request, we have examined the form of registration statement on
Form S-8 (the "Registration Statement") to be filed by Quality Systems, Inc., a
California corporation (the "Company"), with the Securities and Exchange
Commission (the "Commission") in connection with the registration under the
Securities Act of 1933, as amended (the "Act"), of 1,200,000 shares of common
stock, $0.01 par value per share, of the Company (the "Shares"). The Shares are
to be sold by the Company upon exercise of options or pursuant to awards to be
granted under the Company's 2005 Stock Option and Incentive Plan. The Shares
will be offered and sold pursuant to the Company's Registration Statement to be
filed with the Commission.

      As counsel for the Company and for purposes of this opinion, we have made
those examinations and investigations of legal and factual matters we deemed
advisable and have examined the originals, or copies certified to our
satisfaction as being true copies, of those corporate records, certificates,
documents and other instruments which, in our judgment, we considered necessary
or appropriate to enable us to render the opinion expressed below. For these
purposes, we have relied upon certificates provided by public officials and by
officers of the Company as to certain factual matters. We have assumed the
genuineness of all signatures, the authenticity of all documents submitted to us
as originals, the conformity to the original documents of documents submitted to
us as certified or photostatic copies, and the authenticity of the originals of
the latter documents. We have also assumed that the Shares will be evidenced by
appropriate certificates that have been properly executed and delivered.

      On the basis of the foregoing, and solely relying thereon, we are of the
opinion that the Shares are duly authorized and, provided the Shares are issued,
delivered and paid for in the manner and upon the terms contemplated by the
Registration Statement, the Shares will be validly issued, fully paid and
nonassessable.

      This opinion is limited to the General Corporation Law of the State of
California ("California Code"), including the statutory provisions of the
California Code, all applicable provisions of the Constitution of the State of
California and all reported judicial decisions interpreting these laws, and
federal law, exclusive of state securities and blue sky laws, rules and
regulations.

      We hereby consent to the use of our name under the caption "Legal Matters"
in the prospectus forming a part of the Registration Statement and to the filing
of this opinion as Exhibit 5 to the Registration Statement. In giving this
consent, we do not admit that we are within the category of persons whose
consent is required under Section 7 of the Act, or the General Rules and
Regulations of the Commission.

                                        Respectfully submitted,


                                        /s/ Rutan & Tucker, LLP