Schneewind, Jerome B. Essays on the History of Moral Philosophy. Oxford: OUP, 2010.
The essays on historiography are intended to cast doubt on 'the supposition that there is enough significant continuity in the concerns of moral philosophers to warrant discussions of progress and regress in the discipline' (107). Supporters of this supposition are said to believe in a 'single aim' of moral philosophers throughout history. In opposition to the belief in a single aim Schneewind maintains that Aristotle, Sidgwick, the Stoics, Hobbes, Bentham, and Parfit have different aims (120-1). He argues that these different aims make it futile to treat the Socratic question 'How should one live?' as a sufficiently determinate statement of the single aim of moral philosophy (120). . . .
Read the rest here: http://ndpr.nd.edu/review.cfm?id=20708.