At any given moment, there are hundreds of campaigns under way that seek to persuade citizens or decision makers to think, act, or vote in a certain way. But what separates campaigns that win from those that don’t? This book shows how to combine old-school people power with new digital tools and data to win campaigns today. It explores the traditions and practices of organizing and how to marry these with digital communication tools to scale up campaigns and win. Over a dozen case studies from NGOs, unions, and electoral campaigns highlight this work in practice. At a time of growing concern about what the future holds, this book is an indispensable guide not only for seasoned campaigners but also for those just getting started, who want to apply the principles and practices of engagement organizing to their own campaigns for change.