In this seminar I propose that we look together at a number of accounts of the nature of action — and of associated mental attitudes and states, e.g., belief, desire, emotion, motivation — and think about their relation to fundamental questions in morality and the theory of value. We will be looking at empirical as well as philosophical research, and inquiring into questions about how empirical research and philosophy bear upon one another. Students enrolled for credit will be expected to take part in presenting material to the seminar, to write several short discussion notes, and to complete a research paper.