Consider age, gender, sexual orientation and cultural, ethnic and social diversity among youth; encourage respected adults and adolescents to take active leadership roles; utilize participatory training approaches; develop appropriate supporting information, education and communication material in collaboration with youth themselves; involve hard-to-reach youth (eg those out of school, living on the streets or in rural areas); develop adolescent-specific indicators for measuring programme goals; design management information systems to improve programme effectiveness and share information on which programmes work.