It was first implemented in the United States and Canada, it mainly focuses on serious and high-risk youth. It combines several therapeutic techniques such as cognitive-behavioral family therapies and behavioral parent training. To do this, it recognizes that young people will be embedded in a number of different social environments such as community, families and their peer groups and this technique therefore aims to combat all of these (Banks, 2013). Another form of therapy currently used is functional family therapy (FFT). It was designed several years ago and is a short-term intervention strategy designed to be delivered by therapists in the home. This means that it is less intensive than the MST strategy and costs much less; therefore it is often the most popular option with the government. It targets young people aged 11 to 18 who have problems with delinquency, drug addiction or violence. It aims to improve problem-solving skills while improving the family environment by working on emotional connections and strengthening family structure (Banks, 2013). The final popular therapeutic intervention strategy is multidimensional foster care treatment (MTFC). This system is distinguished from the MST and the FFT by the fact that the young person does not continue to live