世界银行：2026年贡献分析实践质量指南报告（英文版）

Contribution analysis (CA) is an evaluation approach that critically assesses how an “intervention”1 contributes to changes of interest. CA recognizes that various factors and actors, other than or in addition to the intervention, typically play a role in explaining how and why change happened—particularly in more complex situations. It thus provides a structured, iterative way to understand complex change processes, make sense of an intervention’s role in relation to these other factors and