Our goal with this review was to identify effective methods of improving family’s engagement and retention in Behavioural Parent Training (BPT). There are a lot of trials in the literature that indicates positive results in BPT, but barriers may be mainly relevant for the initial decision to enroll in a program and in premature drop-out. This generates negative consequences for families, clinicians, research and the national health service. Engaging and retaining families in mental health prevention and intervention programs is critically important to insure maximum public health impact. The literature identifies components for family treatment that may improve overall engagement and reduce drop-out. Seven general engagement approaches were tested: appointment reminders, brief initial engagement discussions, family systems engagement methods, structural or other adaptations to program delivery,
financial incentives, enhanced family support and motivational inter-viewing. Moreover, despite the wide quality of these studies, the relatively small database limits our ability to assess overall impact of engagement interventions quantitatively with any degree of confidence.