HEATHER E. P. CATTELL, PhD, is an author of the 16PF(R) Fifth Edition Questionnaire, published in 1994, which she worked on with her father, Raymond Cattell, the developer of the original 16PF(R). She has written many articles and chapters on the 16PF(R) and coauthored the 16PF(R) Cattell Comprehensive Personality Interpretation report. JAMES M. SCHUERGER, PhD, is Professor Emeritus at Cleveland State University. He conducts workshops nationally on the 16PF(R), worked with Raymond Cattell at the University of Illinois for many years, and is the author of the Adolescent Personality Question...