NSCR-Schoolproject is the umbrella for a research program with four partial studies, aimed at enhancing insights into the development of delinquency and other problem behavior of adolescents, and the role of peer network formation among students, psycho-social development, and reactions from the school on problem behavior. The NSCR Schoolproject aimed to enhance insights into the complicated relations between delinquency and other problem behaviors, psycho-social development, peer networks, and school informal interventions. Data from interviews with students who were removed from class. This subproject aimed to analyze concrete reactions on problem behavior of students and the way in which students experienced these reactions. More specifically, students who were removed from class were interviewed (and re-interviewed), and also their teachers were interviewed about the incident that led to the removal.