This article examines early childhood Pay for Success (PFS) in the context of PFS as a whole. The importance of early education is not disputed - with eighty percent of a child's brain developed by age 3 - with many politicians agreeing that quality preschool is good and perhaps necessary. With universal preschool not really an option due to the cost, activists are turning to PFS and social impact bonds. The goal is to identify promising preschool programs and then scale them up with private backing and ultimately government funds. The integrity and accountability of PFS is welcomed by Save the Children Action Network, a nonprofit that advocates for the funding mechanism and is featured throughout the article.