1 ARTHUR ANDERSEN LLP Exhibit 23.1 CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS As independent public accountants, we hereby consent to the use of our report dated June 2, 1998, and to all references to our firm, included in or made a part of this Form 8-K of JDA Software Group, Inc. /s/ Arthur Andersen LLP Ann Arbor, Michigan August 14, 1998.