Whether it is a result of nature, the consequence of a choice to escape the state of nature, or the outcome of some other process of deliberation, the fact of human association gives rise to recurrent themes in political and social philosophy. The character and requirements of justice, the profile of political legitimacy, and the relationship between the powers of government and the rights of the governed are some of the subjects of ongoing consideration and debate in the disciplines of philosophy, political theory, economics and law. This volume represents a contribution to the investigation of these issues of perennial interest and import, featuring essays whose authors hope to extend, deepen and, in some cases, move in new directions, the current state of discussion.