EXHIBIT 23.1 CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS As independent public accountants, we hereby consent to the incorporation by reference of our report dated February 7, 2001 included in Predictive Systems, Inc.'s Form 10-K for the year ended December 31, 2000 into the Company's previously filed Registration Statements on Form S-8 Nos. 333-32338, 333-35956 and 333-56414. ARTHUR ANDERSEN LLP New York, New York March 30, 2001