In general and visceral surgery, complications are one of the major challenges. These are not always avoidable, so it is crucial to recognize them quickly and treat them with maximum competence. The first part of this book addresses general questions: What are complications and what influencing factors exist? Is it a complication or a treatment error? Which tools are suitable for efficient risk management? Which procedures are particularly frequently affected? What legal aspects should be considered? The specialized section is organized by procedures. Here, the authors provide concrete and actionable recommendations for all important indication areas of general and visceral surgery. The aim is to achieve sustainable quality improvement in medical care and to further develop one's professional skills.