What Have We Learned? Improving Development Policy Through Impact Evaluation

In 2006, CGD released a working group report titled “When Will We Ever Learn? Improving Lives Through Impact Evaluation.” It described an evaluation gap and proposed an international effort to systematically build evidence on “what works” in development with the aim of improving the effectiveness of social programs. Ten years later, we will reflect on progress toward these goals. Despite a host of challenges, hundreds of millions of people across the world have benefited from programs that have been rigorously evaluated and scaled up. Impact evaluation has generated knowledge about poverty and public policy leading to better programs.