Every so often a business book comes along that changes how we think about innovation and entrepreneurship. I have recently stumble across an amazing presentation given by Eric Ries at LSE. He is the author of "The Lean Startup". He defines a start-up as a “human institution designed to create a new product or service under conditions of extreme uncertainty”. The words “human” and “uncertainty” are essential to what follows. A successful start-up does not just rely on a brilliant idea, but also requires managing people through all the challenges of innovation and growth, and through times when the idea will fail and when people will fight over what to do next.