This book is an entrepreneurs’ guide to customer development, a framework for startups to validate their business assumptions and refine their products based on customer feedback. The text draws upon Steve Blank’s "The Four Steps to the Epiphany," outlining key concepts like "minimum viable product," "early adopters," and "pivoting." It emphasizes the importance of "getting out of the building" and interacting directly with potential customers to test assumptions. The authors guide readers through eight steps for conducting customer discovery, including documenting hypotheses, finding prospects, engaging them in conversations, and compiling and analyzing the gathered information. They provide practical advice and examples to demonstrate how to apply customer development to specific business models. The book aims to help entrepreneurs validate their ideas, identify key market segments, and create successful products that meet customer needs.