Green works in international anti-poverty programs, and argues for a systems approach in which one iteratively works with groups at different levels of the system, leveraging elite points of entry while taking direction from people on the ground. I thought the concept of “positive deviance” was useful—find people in the group you’re trying to help who’ve overcome the problem you’re trying to solve, and see if you can help other people do the same thing, using the positive deviants as the model. ( )