Bioethics: Principles, Issues, and Cases, Fourth Edition, explores the philosophical, medical, social, and legal aspects of key bioethical issues. Opening with a thorough introduction to ethics, bioethics, and moral reasoning, it then covers influential moral theories and the criteria for evaluating them. Integrating eighty-seven readings - ten of them new to this edition - substantive introductions to each issue, numerous classic bioethical cases, and abundant pedagogical tools, this text addresses the most provocative and controversial topics in bioethics.