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Sorting through heterogeneity of impact to enhance policy learning

Jed Friedman's picture

The demand and expectation for concrete policy learning from impact evaluation are high. Quite often we don’t want to know only the basic question that IE addresses: “what is the impact of intervention X on outcome Y in setting Z”. We also want to know the why and the how behind these observed impacts. But these why and how questions, for various reasons often not explicitly incorporated in the IE design, can be particularly challenging.