Juvenile delinquency is a significant problem in our society. In forensic practice, we focus on treatment of juvenile delinquents, in order to reduce the risk of recidivism. Unfortunately, interventions are not yet effective for all forenisc youth. We believe this can be improved by taking into account the neurobiological development of youth. Therefore, in this project we will investigate how the individual neurobiological development of juvenile delinquentsis related to their psychosocial development and the effectiveness of treatment. With this knowledge, we can apply existing forensic interventions and adolescent criminal law more effectively.