Incremental improvements in the effectiveness of aid programmes can only occur after careful reflection about the factors that affect the success or failure of development interventions. This requires robust evaluation based on carefully collected data and sound methodologies for its analysis. GDSI’s evaluation work documents the expected and achieved accomplishments of the programme, critically examining the presumed causal chains, processes, and attainment of results, as well as the contextual factors that may enhance or impede the achievement of results.