The document outlines the WHO's approach to strengthening health systems through six building blocks: service delivery, health workforce, information, medical products/vaccines/technologies, financing, and leadership/governance. For each building block, the document identifies priorities and actions needed to achieve objectives such as making services accessible and equitable, developing a well-performing health workforce, establishing national health information systems, ensuring access to essential medical products, developing sustainable financing mechanisms, and strengthening health sector policies and regulatory frameworks. The document provides a framework to guide WHO's work with countries in assessing health system needs and gaps.