This casebook focuses not only on the rules and principles of contract law, but also on the lawyer's role in planning and drafting contracts and on the richness of contract theory. It has comprehensive coverage of contract law and related obligation, the latter including promissory estoppel, restitution, and tort arising in the contract setting. This book is primarily a case book designed to help students develop important analytical and critical skills, but also has ample notes, problems, and excerpts that focus on the nature, function, and limits of contract and related law. Features of the new Fifth Edition include: several recent cases that bring important issues up to date; new notes and comments about recent developments in contract law and recent contract controversies in the news; and new excerpts from the secondary literature focusing on major recent developments.