This book has been a classic in the field, due in part to the Society for the Psychological Study of Social Issues (SPSSI). Their involvement in this project has helped to bring prominent authors on board. Last published in 1991 this stellar text has been significantly revised by Dr. Charles Judd and by a new coauthor, prominent psychologist Rick Hoyle. Dr. Hoyle is well known in the research methods and statistics area, as well as being active in APA, APS, MPA, and many other professional organizations. He currently is a full professor and teaches at the University of Kentucky.