Family-Focused Adolescent &Amp; Lifelong Health Promotion Optimization Trial

The aim of this study is to conduct a multi-country, cluster-randomized factorial trial to optimize the Parenting for Lifelong Health (PLH) for Parents and Teens program in Moldova and North Macedonia. Specifically, this trial will evaluate the effectiveness and cost consequences of three additional intervention components: UNICEF's Helping Adolescents Thrive comics, adolescent peer support based on UNICEF's I Support My Friends intervention, and engagement boosters. ALTERNATIVA will deliver the program in North Macedonia and Health for Youth Association in the Republic of Moldova. This trial is implemented according to the Multiphase Optimization Strategy (MOST). MOST involves three phases. The preparation phase involves adapting and piloting the intervention (Phase 1). The optimization phase involves a factorial trial (Phase 2). Finally, the evaluation phase involves conducting a randomized controlled trial to assess the optimized intervention's effectiveness and cost-effectiveness (Phase 3). A Phase 2 factorial trial is the focus of this registration.