RANDY W. KAMPHAUS, PhD, is Distinguished Research Professor of Educational Psychology and Instructional Technology at The University of Georgia, Athens. He is an expert in the field of child and adolescent assessment and the author of several books on the topic. He is also coauthor of the BASC-II (Behavior Assessment System for Children, Second Edition), a widely used assessment instrument.JONATHAN M. CAMPBELL, PhD, is Associate Professor of Educational Psychology and Instructional Technology at The University of Georgia, Athens. His research and clinical interests involve assessment and differential diagnosis of autism spectrum disorders as well as understanding typical peers' perceptions of autism. He has authored several articles in the area of intelligence test interpretation and serves on the editorial boards for the Journal of Psychoeducational Assessment and Journal of Pediatric Psychology.