This acclaimed volume offers a systematic introduction to and striking analysis of the central issues animating current debate in moral philosophy. It will be of interest to anyone with a serious interest in the philosophical foundations of ethics. Topics discussed in this book include: realist vs anti-realist accounts of moral truth; cognitivist vs expressivist accounts of moral judgement; internalist vs externalist accounts of the relation between moral judgement and the will; Humean vs anti-Humean theories of motivation; and the debate between those who think that morality is a system of hypothetical imperatives and those who think that moral requirements are categorical. In 2000, "The Moral Problem" received The American Philosophical Association's first APA Book Prize for excellence in scholarship.