External validity and policy adaptation: From impact evaluation to policy design

Martin J. Williams

No 18/2019, PEGNet Policy Briefs from PEGNet - Poverty Reduction, Equity and Growth Network, Kiel Institute for the World Economy (IfW Kiel)

Abstract: * Whether a policy that worked in one context will also work in another depends on the interaction of the policy's mechanism with features of the context. This is its "external validity". * Existing methods are helpful for understanding a policy's external validity, but are limited to examining a small number of dimensions of context. * Mechanism mapping is a five-step procedure to help policymakers identify potential mechanism-context interactions, and come up with suitable adaptations.

Date: 2019
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