Have you ever come up with an idea for a new product or service but didn’t take any action because you thought it would be too risky? Or at work, have you had what you thought could be a big idea for your company—perhaps changing the way you develop or distribute a product, provide customer service, or hire and train your employees? If you have, but you haven’t known how to take the next step, you need to understand what the authors call the innovator’s method—a set of tools emerging from lean start-up, design thinking, and agile software development that are revolutionizing how new ideas are created, refined, and brought to market. To date these tools have helped entrepreneurs, designers, and software developers manage uncertainty—through cheap and rapid experiments that systematically lower failure rates and risk. But many managers and leaders struggle to apply these powerful tools within their organizations, as they often run counter to traditional managerial thinking and practice.