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

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.

Leadership requires creating conditions that enable employees to do the kinds of experimentation that entrepreneurship requires.

I would say, as an entrepreneur everything you do - every action you take in product development, in marketing, every conversation you have, everything you do - is an experiment. If you can conceptualize your work not as building features, not as launching campaigns, but as running experiments, you can get radically more done with less effort.

We must learn what customers really want, not what they say they want or what we think they should want.

As an entrepreneur, I knew that if my company failed, I could always try again. So I often felt that the only real risk of true financial ruin came from the possibility of a serious illness that either exceeded my insurance plans lifetime limits, or was not covered due to rescission.

The minimum viable product is that version of a new product which allows a team to collect the maximum amount of validated learning about customers with the least effort.