Michael Clemens writes:
Here I discuss a new research paper that I wrote with Gabriel Demombynes of the World Bank. We ask when it’s important to take great care in measuring a project’s impacts, and we illustrate one concrete case: the Millennium Village Project. We show how easy it can be to get the wrong idea about the project’s impacts when careful, scientific impact evaluation methods are not used. And we detail how the impact evaluation could be done better, at low cost.
There are some good graphs at the first link and here is the associated podcast.