Jerry Suls is Professor of Psychology at the University of Iowa. He has published more than 130 articles and chapters on social psychology and health psychology and is the author or editor of numerous books, including "Psychological Perspectives on Self and Identity "(edited with Abraham Tesser and Richard B. Felson, 2000) and "Handbook of Social Comparison" (edited with Ladd Wheeler, 2000). Kenneth A. Wallston is Professor of Psychology in Nursing at Vanderbilt University. He has published extensively on perceived control and health as well as on adaptation to rheumatoid arthritis. He is a me...