“Lean” impact evaluations: experimental evidence in adaptive humanitarian interventions

Impact Evaluation is an important tool for assessing what works in development and humanitarian interventions, providing rigorous evidence to inform policy and contribute to the global evidence base. However, not every context or programme is suitable for traditional impact evaluation approaches. Many interventions supported by the World Food Programme (WFP) are delivered in rapidly evolving contexts and aim to meet immediate food needs. These rapidly evolving contexts require a lean and adaptive approach to testing and optimising life-changing interventions.