The dominant position in philosophy on the topic of practical rationality is that one acts so as to maximize the satisfaction of one's preferences. This view is most closely associated with the work of David Gauthier, and in this new collection of essays some of the most innovative philosophers currently working in this field explore the controversies surrounding Gauthier's position. This collection will be of particular interest to philosophers of social theory and to reflective social scientists in such fields as economics, political science and psychology.