Overview MST-FIT (Multisystemic Therapy – Family Integrated Transitions) is an intensive family and community-based treatment that addresses the multiple determinants of serious antisocial behavior. MST strives to promote behavior change in the youth’s natural environment, using the strengths of each system to facilitate change. Treatment is initiated for the youth and family while the youth is still in placement. It is an adaptation of traditional MST Therapy designed to promote successful int…