Everyday life in our schools is increasingly shaped by various forms of violence. Playground fights are no longer the only concern; now, more subtle forms of aggression often emerge, or violence occurs in virtual spaces. Nevertheless, the consequences for the affected students and the institution of school as a whole are profound, sometimes even existential. Therefore, it is essential for schools today to implement a practical concept for school violence prevention. Roland Bertet and Gustav Keller lay the groundwork for this. They first precisely clarify the concept of violence, then define a comprehensive foundational concept for violence prevention. In the next step, the authors provide a thorough overview of specific programs for practical violence prevention. Finally, the two experienced professionals assess how effective these measures are.