The "chapter numbers" seem to correspond to the numbers on the drop-down in xman. William Kreuter, Senior Computer Specialist, University of Washington Ctr. for Cost & Outcomes Research, 146 N. Canal St. #300, Seattle, WA 98103 billyk at u.washington.edu http://staff.washington.edu/billyk/ voice or voice mail: 206-543-5007 fax: 206-543-5318 mailstop: 358853