BROWN & BAIN
                           A PROFESSIONAL ASSOCIATION
                           2901 NORTH CENTRAL AVENUE
                             PHOENIX, AZ 85012-2788
                                 (602) 351-8000


                                    May 29, 1996


Ladies and Gentlemen:

     We have acted as counsel to Intelligent Decision Systems,  Inc., a Delaware
corporation  (the "Company"),  in connection with its Registration  Statement on
Form S-3 (the  "Registration  Statement") filed under the Securities Act of 1933
relating to the registration of 1,964,154 shares of its common stock,  $.001 par
value (the "Shares"),  on behalf of the Selling Stockholders identified therein.
Capitalized  terms  used  without  definition  herein  shall  have the  meanings
ascribed to such terms in the Registration  Statement.

     In that connection,  wehave examined such documents,  corporate records and
other  instruments as we have deemed  necessary or  appropriate  for purposes of
this opinion,  including the Restated Certificate of Incorporation and Bylaws of
the Company.

     Based upon the foregoing,  we are of the opinion  that:

     1. The Company is a corporation  duly organized and validly  existing under
the laws of the State of Delaware.

     2. The  Shares,  when issued and sold in  accordance  with the terms of the
Warrants, will be validly issued, fully paid and nonassessable.

     We  hereby  consent  to the  use  of  this  opinion  as an  exhibit  to the
Registration Statement.


                                                Very truly yours,

                                                  

                                              /s/BROWN & BAIN, P.A.


Intelligent Decision Systems, Inc.
  2025 East Beltline Avenue SE, Suite 400
    Grand Rapids, MI 49546

B&B:shj 

                                  EXHIBIT 5.01