Theory of planned behaviour (TPB) and social cognitive theory (SCT).
BehavioralTPB is appropriate to influence adolescents' behaviour related to the use of contraceptive methods and their health/information seeking behaviour. The SCT helped to find out strategies to improve communication about sexuality, to promote openness towards adolescents' sexuality among parents, community members and health providers and for health providers to adopt a more adolescent friendly attitude.The development of the strategies in the different countries is a dynamic process that is continuously being adapted. The target groups were "driving" the process of identifying, selecting and implementing interventions. Therefore, local institutions were involved in the intervention. Attention was paid to ensure that the interventions were in line with the existing local structures/policies and reinforce the local health system.Primary health care services had a key role in the interventions. Gender was a transversal topic throughout the intervention process.