These essays represent the latest research of a number of prominent political theorists. The essays explore the role of government, the nature of public discourse and the obligations of citizens. Some examine the sources of our need for government, asking what form of government we should establish and whether a single form can be suitable for all societies. Some seek to discover the proper aims of government - asking, for example, whether government should promote equality among its citizens or whether it should allow inequalities in the hope of raising everyone's level of well-being. Others explore government's role in ensuring citizens' autonomy and in protecting their rights to pursue their own interests and projects. Still others examine the processes through which policies are formulated and debated, asking what forms of public deliberation are likely to produce the best results.