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

Martin Ravallion

The World Bank Economic Review, 2001, vol. 15, issue 1, 115--140

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.

Date: 2001
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