This publication examines the effectiveness of aid agency projects in relation to social development work, which are based on four key concepts of social sectors; safety nets; inclusion, equity and empowerment; and social relations. The report draws on recent and ongoing OED evaluations supplemented by other data including a portfolio review, a literature review, individual surveys and a review of country assistance strategies. Four main recommendations are made to improve policy outcomes, including the need to ensure that stated Bank or policy priorities receive adequate treatment across regions and countries, with better strategic planning to address current skills and monitoring and evaluation gaps.