This is an introductory text for an ethics course that provides the theoretical background for discussion of ethical problems. It could be supplemented with essays or anthologies on a range of particular problems, or an instructor could focus on the problems that occupy the concluding chapters: abortion, whistle-blowing, and the relation between ethics and the law. The first few chapters present ethical theory in straightforward fashion discussing alternatives and providing historical orientation. The middle chapters develop what the author calls "action guides" with principles for applying them. The last few chapters demonstrate the theory and action guides at work.