MultifunC is a treatment program aimed at young people between 14 and 17 years, who show outward behavior, and are at high risk for continuing anti-social behavior. Treatment is focused on changing the anti-social behavior, learning the young person social skills and changing the young person’s attitude. Efforts are also directed towards family processes, changes in relationships with other youths and towards how the young person is working and performing in school. The program consists of 6-8 months of residential care followed by a transition process focusing on family treatment and integration of general pro-social context, ie. school, work, recreation, positive and network. The study aims to investigate the implementation of MultifunC at two Danish institutions. The study focuses on the implementation process, ie. to what extent MultifunC is established at the two institutions, and whether the program is practiced with high fidelity according to MultifunC-manual's instructions.