Editor's Note: This blog is the first in a series of education scaling-related resources. Given the mismatch between massive educational challenges and resources that are stretched paper thin, it is essential to make the most out of every dollar invested by parents, schools, NGOs, and governments. This requires a sound understanding of impact—how effective an intervention is—not only in the aggregate, but in a variety of contexts and for a range of audiences, including the most marginalized.
