This is one of the most important lessons of the scientific method: if you cannot fail, you cannot learn. - Eric Ries

if you cannot fail, you cannot learn.

Innovation accounting begins by turning the leap-of-faith assumptions discussed in Chapter 5 into a quantitative financial model. Every business plan has some kind of model associated with it, even if it’s written on the back of a napkin. That model provides assumptions about what the business will look like at a successful point in the future.

when you have only one test, you don’t have entrepreneurs, you have politicians, because you have to sell.

A pivot is not just an exhortation to change. Remember, it is a special kind of structured change designed to test a new fundamental hypothesis about the product, business model, and engine of growth. It is the heart of the Lean Startup method. It is what makes the companies that follow Lean Startup resilient in the face of mistakes: if we take a wrong turn, we have the tools we need to realize it and the agility to find another path.