1. Donald D. Deshler is assistant professor of special education at the University of Kansas Medical Center, College of Health Sciences and Hospital, Kansas City, Mo.
2. William R. Ferrell is professor of systems and industrial engineering at the University of Arizona, Tucson.
3. Corrine E. Kass is professor of special education at the University of Arizona, Tucson. Requests for reprints should be sent to Dr. Deshler, University of Kansas Medical Center, Kansas City, Mo. 64110.