Ten years ago, when Theory U was first published, Otto Scharmer invited us to see the world in new ways and, in so doing, discover a revolutionary approach to leadership. But, at over 500 pages, that book was a bit daunting. Now Scharmer has created a concise guide to its key concepts and applications, making his vital work and its methods and tools accessible to a wider audience. In Part I, he explores the framework and main ideas of Theory U. Part II describes its process, principles, and practices, showcasing hands-on methods and tools for change makers. Part III outlines a framework for updating the operating systems of our educational institutions, our economies, and our democracies. Scharmer's Theory U model of how to open our mind, emotions, and will to moments of discovery and mutual understanding is profound and much needed. -Edgar Schein, Sloan Fellows Professor of Management Emeritus, MIT Sloan School of Management