Adverse events occur in healthcare with worrying and surprising frequency and, of these, a substantial portion are preventable. This highly-readable book, translated and update from the original Dutch edition, presents 15 model case studies which have been carefully designed to explore common themes in medical errors and offer learnings from those events that will guide practice to prevent similar tragedies unfolding in future. Using 15 years of experience working in patient safety, the author makes concrete recommendations around assessment, attitude and performance, and provides a concise and accessible methodology for working safely.