Navigate critical water and sanitation challenges with innovative systems thinking. This practical guide equips practitioners, programme managers, and researchers with essential tools and real-world case studies for building sustainable water supply and hygiene (WASH) systems. Discover interdisciplinary approaches to tackle complex issues, fostering effective collaboration with communities and governments. A must-read for NGO staff and policymakers aiming to drive impactful change and achieve SDG6, enhancing water resources management in development initiatives across India.