“…In existing studies and literature, these are often suggested to be the key factors of effective preventive and promotive programmes for adolescents (Durlak & Wells, 1997;Greenberg et al, 2001Greenberg et al, , 2003Catalano et al, 2002Catalano et al, , 2004Flay, 2002;Biddle et al, 2004;Rickwood et al, 2005). It is also important to consider the developmental stage and tasks of the adolescent (Hodgson et al, 1996;Hüsler et al, 2005;O'Connell et al, 2009). Dryfoos has (1990) suggested, for example, that enhancement of early education and prevention of school failure should be given high priority, not only by those who want to lower the drop-out rate, but also by those interested in preventing substance abuse and conduct disorders.…”