“Cause” expert and creator of the Millennial Impact Project, Feldmann, sheds light on how social movements are built and how they are sustained. Based on six years’ research on Millennial cause involvement, including their (surprising) levels of financial giving, this book aims to “help others understand the reasons why people get involved to make a difference”. Although it does not claim to be a how-to for social movement innovation, Feldmann and the real-life practitioners whose stories appear throughout point to practices and characteristics that make for long-term effectiveness. A summary conclusion and source index complete this practical and inspirational resource. While written for a secular audience, the language of cause and commitment will be familiar to religious leaders. It is aimed at Millennials (born from 1980-2000), social entrepreneurs, and leaders who want to engage Millennials’ considerable gifts and passions for the common good.