We have entered an era of unprecedented entrepreneurial renaissance, but the success rate of today’s startups is very low due to the absence of effective management. How to improve a startup’s chances of success has become an inevitable question for every entrepreneur. This book proposes the idea of ‘lean startup’. By developing minimum viable products and failing fast, a business could validate whether its product meets the customers’ needs or not at the minimum cost and in the shortest time. During the process, a startup can acquire “validated learning” and improve its chance of success.