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THE WORLD BANK ECONOMIC REVIEW, VOL. 15, NO. 1, 115-140
© 2001 International Bank for Reconstruction and Development / The World Bank

Article

The Mystery of the Vanishing Benefits: An Introduction to Impact Evaluation

Martin Ravallion

the Development Economics Research Group at the World Bank

Abstract

This article provides an introduction to the concepts and methods of impact evaluation. The author provides an intuitive explanation in the context of a concrete application. The article takes the form of a short story about a fictional character's on-the-job training in evaluation. Ms. Speedy Analyst is an economist in the Ministry of Finance in the fictional country of Labas. In the process of figuring out how to evaluate a human resource program targeted to the poor, Ms. Analyst learns the strengths and weaknesses of the main methods of ex post impact evaluation.


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