“…Conventional child mental health services have developed slowly in response to these trends and remain on too modest a scale to aid more than a minority of the populations at risk (Boyle & Offord, 1988). Indeed, even if rates of mental disorder were static, the numbers at risk, especially in inner cities (Quinton, 1988), would be in any case substantial (McArdle et al, 1995; Verhulst, van der Ende, Ferdinand, & Kasius, 1997). Consequently, there has been significant interest in the potential of large‐scale preventative interventions capable of promoting normal psychosocial development and of reducing risk of mental disorder (Offord, 1996).…”