EXHIBIT 32.1

      CERTIFICATION OF CHIEF EXECUTIVE OFFICER AND CHIEF FINANCIAL OFFICER
                       PURSUANT TO 18 U.S.C. SECTION 1350,
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

      In connection with the quarterly  report on Form 10-Q of Quality  Systems,
Inc.  (the  "Company")  for the  quarterly  period  ended  June  30,  2005  (the
"Report"), the undersigned hereby certify in their capacities as Chief Executive
Officer and Chief Financial Officer of the Company, respectively, pursuant to 18
U.S.C.  section 1350, as adopted  pursuant to Section 906 of the  Sarbanes-Oxley
Act of 2002, that:

1.    the Report fully complies with the  requirements of Section 13(a) or 15(d)
      of the Securities Exchange Act of 1934, as amended; and

2.    the information  contained in the Report fairly presents,  in all material
      respects,  the  financial  condition  and  results  of  operations  of the
      Company.


Dated: August 4, 2005              By: /s/ LOUIS SILVERMAN
                                       -----------------------------------------
                                   Louis Silverman
                                   Chief Executive Officer (principal executive
                                   officer)


Dated: August 4, 2005              By: /s/ PAUL HOLT
                                      ------------------------------------------
                                   Paul Holt
                                   Chief Financial Officer (principal accounting
                                   officer)

      A signed  original of this written  statement  required by Section 906, or
other  document  authenticating,   acknowledging,   or  otherwise  adopting  the
signatures  that  appear in typed  form  within the  electronic  version of this
written statement  required by Section 906, has been provided to the Company and
will be retained by the Company and  furnished  to the  Securities  and Exchange
Commission or its staff upon request.


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