The treatment of teens requires a very different approach than that of treating adults. Adolescents require a treatment model that focuses on habilitation rather than rehabilitation, emphasizing the teaching of psychosocial skills. Adults on the other hand, require a rehabilitation model that focuses on pre-existing recovery skills. Additionally, adolescent treatment must take into consideration the developmental differences between adolescents and adults and the high correlation between substance use and co-occurring mental health issues common in adolescents who abuse drugs and alcohol.