Consent of Independent Public Accountants


As independent public accountants, we hereby consent to the incorporation of our
report  included  in  this  Form  10-K,  into  the  Company's  previously  filed
Registration  Statements  on Forms S-3 and Forms  S-8 (File  Numbers  333-09917,
333-10117, 333-09911 and 333-09909).

                                               ARTHUR ANDERSEN LLP

Phoenix, Arizona
  December 9, 1996.