The past five years have seen a proliferation of impact evaluations) by development agencies across the globe. This report was commissioned by the UK Department for International Development’s (DFID’s) Evaluation Department to inform discussions on impact evaluation production and use within the Network of Networks Impact Evaluation Initiative (NONIE). It builds on an initial scoping study prepared for DFID which made recommendations on improving impact evaluation production and use, focusing on clustering, coordination, knowledge management, capacity strengthening and communication and uptake. This the report goes further by expanding both the literature review and the annotated database of impact evaluations, as well as honing in on specific dynamics of impact evaluation production across sectors.