Xavier Ashe rated The Entrepreneur's Guide to Customer Development: A cheat sheet to The Four Steps to the Epiphany: Show rating 4 stars Oct. 11, 2016 Public Brant Cooper: The Entrepreneur's Guide to Customer Development: A cheat sheet to The Four Steps to the Epiphany (2010)The Entrepreneur's Guide to Customer Development: A cheat sheet to The Four Steps to the Epiphany by Brant Cooper