Social inventions are new ways of solving human problems. This article reports on an action research project designed to find social inventions to reduce structural lag in four programs that support the transition to adulthood of marginalized youth in Latin America. The investigators engaged youth and staff members in identifying important questions, collecting and interpreting data, and using findings to improve their practices. Their issues aligned with social setting features: activities, resources, roles, and norms. Among their social inventions were "the life project," the role of mentor, youth responsibility, and new norms of reflection introduced by action research, which not only revealed social inventions but generated them as well. Interaction with external parties contributed to this process: the investigators, "local researchers" engaged as part of the project, participants in conferences convened for participants. Rather than recommending social inventions for adoption in other locations, we recommend using action research to generate local social inventions.