EXHIBIT 23.1 CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS As independent public accountants, we hereby consent to the incorporation by reference in this Registration Statement of our report dated January 21, 2000 included in Robert Half International Inc.'s Form 10-K for the year ended December 31, 1999, and to all references to our firm included in this Registration Statement and in the Prospectus. ARTHUR ANDERSEN LLP San Francisco, California November 16, 2000