Stephen Darwall presents a series of essays that explore the Second-Person Standpoint (SPS)--an argument which advances an analysis of central moral concepts as irreducibly second personal in the sense of entailing mutual accountability and the authority to address demands. He illustrates the power of the second-personal framework to illuminate a wide variety of issues in moral, political, and legal philosophy. Section I concerns morality: for example,its distinctiveness among normative concepts, the relation between 'bipolar' obligations (owed to someone) and moral obligation period, and whether morality requires general principles. Section II focuses on autonomy, its relation to the will, and the sense in which we can give ourselves reasons for acting.And Section III concerns the nature of authority and the law. It argues that only a second-personal framework is able to explain these and the differences between criminal and civil law.