"In this compelling book, strategy guru Roger L. Martin and Skoll Foundation President and CEO Sally R. Osberg describe how social entrepreneurs target systems that exist in a stable but unjust equilibrium and transform them into entirely new, superior, and sustainable equilibria. All of these leaders—call them disrupters, visionaries, or changemakers—develop, build, and scale their solutions in ways that bring about the truly revolutionary change that makes the world a fairer and better place. The book begins with a probing and useful theory of social entrepreneurship, moving through history to illuminate what it is, how it works, and the nature of its role in modern society. The authors then set out a framework for understanding how successful social entrepreneurs actually go about producing transformative change. There are four key stages: understanding the world; envisioning a new future; building a model for change; and scaling the solution. With both depth and nuance, Martin and Osberg offer rich examples and personal stories and share lessons and tools invaluable to anyone who aspires to drive positive change, whatever the context."--Amazon.ca.