This multicentre study examines females with conduct disorder between late childhood and the end of puberty. So far most knowledge about causes, the course of the disorder and the therapeutic options has predominantly originated from studies with males. Even though conduct disorder occurs more often in males than in females, about one to three percent of females suffer from this disorder. The study will examine, among others, the underlying neurobiological mechanisms. What is the relation between genetic predisposition and environmental influences? What are the roles of the autonomic nervous system and the stress hormone system? Additionally, neurocognitive aspects will be examined. How does the regulation and processing of emotions work in affected females?