“…Treatment approaches such as Multidimensional family therapy (Liddle, 2002;Liddle et al, 2004a;2004b), Multisystemic Treatment (MST) (Henggeler et al, 1991;Henggeler, Clingempeel, Brondino & Pickrel, 2002), and Behavioural Exchange Systems Therapy (BEST) (Toumborou, Blyth, Bamberg, Bowes & Douvas, 1997;Toumbourou et al, 2001) have all rigorously demonstrated the clear advantages of involving family in the treatment of adolescent substance misuse and other behavioural problems, such as juvenile crime . Family-focused interventions, whether systemic in nature, or a combination of behavioural, cognitive-behavioural, or focused on parenting skills, parent training, parent education or counselling-oriented, have all demonstrated to have effect sizes two to nine times greater than child onlyfocused interventions (Kumpfer, Alvardo & Whiteside, 2003;Latimer et al, 2003;Liddle et al, 2004 ).…”