Care management of children and adolescents admitted for disruptive behaviors in emergency rooms is an issue. No consensus or official recommendation exists. However, use of emergency care in this context is increasing in most western countries and it exposes to several risks (inappropriate use of hospitalizations, social rupture, ignorance of comorbidities and suicide risk). The Trajectories project is designed to describe children and adolescents with disruptive behaviors, their care management and to follow their life trajectory and psychiatric evolution after admission to emergency rooms. Better understanding this population will improve their medical and social care management, thereby giving professionals the right tools.