The document outlines a 5-step Lean process for social innovation: 1) Define guideposts like target users and goals, 2) Propose 3-factor solutions addressing value, scale, and impact, 3) Develop success metrics, 4) Quickly test solutions through the Test-Learn-Respond loop, and 5) Track learnings through iterative testing. It provides an example of using this process to develop an English learning program for immigrants, iterating based on testing until a validated model was found that served over 1 million users at minimal cost. The key is embracing an experimental mindset to fail fast, learn from failures, and improve solutions.