Overview of the importance of mental health and well-being in schools and presents a systems-based approach to strengthening support through “health-promoting schools.” It explains how mental health influences learning, development, and long-term outcomes, noting that many mental health conditions emerge during school years and can affect educational attainment and life trajectories . The document outlines the role of schools as key environments for prevention, early identification, and access to support, and introduces a whole-school framework that integrates policies, curriculum, environments, and services. It also provides practical examples of actions across multiple domains—such as governance, community partnerships, and service provision—to improve mental health outcomes, alongside case studies demonstrating implementation in different country contexts.