The document summarizes the Triple-S research project, which aims to contribute to a shift towards sustainable service delivery approaches for rural water supply in developing countries. It discusses key aspects of a service delivery approach, including clear policies and roles, planning, community participation, appropriate technology, and long-term support. The project involves action research in Ghana and Uganda, as well as studies in 13 other countries, to identify factors that promote or constrain services at scale. Findings indicate countries progress along a continuum from infrastructure implementation to full service delivery approaches, with gaps in areas like asset management, life-cycle cost planning, and regulation.