“…For prevention actions to be efficacious in improving risks awareness and social skills, it is important to implement early interventions; it has been suggested that preventive actions among young people should be initiated early on in their lives [ 7 , 8 , 9 , 10 ]. Continuity in action over several school years, especially during the transition between primary and secondary school, could also be a factor predictive of efficacy [ 8 , 9 , 11 , 12 , 13 , 14 , 15 ]. Concerning the specific qualities that make prevention programmes at school efficacious among schoolchildren, a few studies have shown the benefits of a theoretical base integrating the promotion of health and the development of psychosocial skills through the use of individuals’ experiences and resources derived from their environment [ 8 , 10 , 11 , 16 , 17 , 18 , 19 , 20 , 21 ].…”