The goal of a startup is to figure out the right thing to build-the thing customers want and will pay for-as quickly as possible. In other words, the Lean Startup is a new way of looking at the development of innovative new products that emphasizes fast iteration and customer insight, a huge vision, and great ambition, all at the same time.
Eric RiesProducts a start-up builds are really experimentsโฆLearning about how to build a sustainable business is the outcome of those experiments [which follow] a three-step process: Build, measure, learn.โ โ[A startup is] โฆ an organization dedicated to creating something new under conditions of extreme uncertainty.
Eric RiesStart-ups make so many mistakes that the challenge to identify the root cause of a failure is tough. But believing in your own plan is probably the worst.
Eric Ries