Bullying is not a trivial offense - not even among children and adolescents. Especially in schools, it is not a new or isolated phenomenon. It is part of everyday school life. But when do we speak of bullying, and what is the difference between daily teasing or a mean joke? Where does fun stop, and when does harm begin? What are the causes, and what points of intervention are there for meaningful actions? Successful and sustainable intervention and prevention work requires time and practical skills, presenting enormous challenges in everyday school life. The introduction of a Bullying Intervention Team (BIT) at your school is also a first step towards a successful anti-bullying culture. The authors have compiled practical tools and methods in this handbook to support you on the path to a bullying-free environment.