DAVID A. SCHROEDER is Professor and chair of the department of Psychology at the University of Arkansas. In addition to his teaching and research concerning social dilemmas, he has a continuing interest in the motivation of helping and is coauthor of a new book entitled The Social Psychology of Helping and Altruism.

• Preface An Introduction to Social Dilemmas by David A. Schroeder Reward Structure and Cooperation in the N-Person Prisoners' Dilemma by S. S. Komorita and Alan L. Ellis Norms in Social Dilemmas by Norbert L. Kerr Helping the Group or Helping Yourself? Social Motives and Group Identity in Resource Dilemmas by Roderick M. Kramer and Lisa Goldman Social Contracts and the Provision of Public Goods by Sanford L. Braver Social Dilemmas and Perceptions: Experiments on Framing and Inconsequentiality by Peregrine Schwartz-Shea and Randy T. Simmons Cooperation under Laissez Faire and Majority Decision Rules in Group-Level Social Dilemmas by John Orbell, Robyn Dawes, and Alphons van de Kragt Collective Hedonism: A Social Loafing Analysis of Social Dilemmas by Kipling Williams, Jeffrey M. Jackson, and Steven J. Karau When Do People Want to Change the Rules for Allocating Shared Resources? by Charles Samuelson and David Messick How to Stop Throwing Good Money after Bad: Using Theory to Guide Practice by Joel Brockner A Framework for Understanding Decisions in Social Dilemmas by David A. Schroeder, Mark E. Sibicky, and Mary Elizabeth Irwin References Index