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. The aim of this follow up study was to get more insight how different careers of secondary school students, in particular with regard to work, truancy and dropping out, were related to misbehavior and delinquency after secondary school. The aim was to analyze how the school- and work careers in late adolescence were related to changes in delinquent behavior among the respondents of the NSCR School Project.