The third edition of this widely read textbook, written by national leaders in patient safety, provides an in-depth introduction to the field. The new edition uses case studies to discuss the history of the patient safety movement, the epidemiology of safety hazards, specific error types, and strategies to improve safety in clinical microenvironments and at the organizational level. Substantial new content has been added to highlight emerging areas of the field, such as safety culture, policy and regulatory initiatives to improve safety, and diagnostic errors.