The THAV therapy program presents a comprehensive treatment package for the multimodal therapy of children with aggressive behavior, particularly towards peers. It is especially suitable for use with children aged 6 to 12 years who exhibit reactive aggressive behavior and issues with affect regulation, as well as with children displaying proactive aggressive behavior and limited prosocial interpersonal relationship and emotional response patterns. This new edition features a thorough revision and expansion of the therapy program. The manual begins with a description of the disorders and addresses the causes of reactive and proactive aggressive behavior, along with potential therapeutic approaches. It then comprehensively explains the 16 components of the modular treatment program. The focus on patient-centered therapy is also discussed.