This book is a real guide for entrepreneurs, revealing the secrets of successful startups through Steve Blank’s innovative approach to customer development. As early as possible, you need to leave the office and test your business idea on real users—making changes to the original concept, sometimes radical ones—then test the updated model again, never stopping this cycle of iterations. The work of Steve Blank and Bob Dorf not only demonstrates best practices for building startups, but also offers a clear methodology for building new businesses step by step.