DAVID H. OLSON, Ph.D Professor, Family Social Science, University of Minnesota; Developed ten diagnostic tools and Circumplex Model; Licensed Consulting Psychologist and Licensed Marital & Family Therapist, State of Minnesota.   JOAN M. DRUCKMAN, Ph.D Marriage and Family Counselor, Palo Alto, California; Co-directed study on "Effectiveness of Five Types of Premarital Preparation Programs."   DAVID G. FOURNIER, Ph.D Associate Professor, Child and Family Development, Oklahoma State University; completed study of reliability and validity of PREPARE. Former Director, Marital & Family Therapy Program.