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This book provides a comprehensive yet accessible guide to running randomized impact evaluations of social programs. Drawing on the experience of researchers at the Abdul Latif Jameel Poverty Action Lab, which has run hundreds of such evaluations in dozens of countries throughout the world, it offers practical insights on how to use this powerful technique, especially in resource-poor environments.

This step-by-step guide explains why and when randomized evaluations are useful, in what situations they should be used, and how to prioritize different evaluation opportunities. It...

Millions of people in the third world die from diseases that are rare in the first world--diseases like malaria, tuberculosis, and schistosomiasis. AIDS, which is now usually treated in rich countries, still ravages the world's poor. Vaccines offer the best hope for controlling these diseases and could dramatically improve health in poor countries. But developers have little incentive to undertake the costly and risky research needed to develop vaccines. This is partly because the potential consumers are poor, but also because governments drive down prices.

In Strong...