Startups exist not to make stuff, make money, or serve customers. They exist to learn how to build a sustainable business.

This learning can be validated scientifically, by running experiments that allow us to test each element of our vision. That's why the fundamental activity of a startup is to turn ideas into products, measure how customers respond, and then learn whether to pivot or persevere.

Lean startup is a methodology built around maximizing validated customer learning thought fast Build/Measure/Learn iteration loops. It isn't just about how to create a more successful entrepreneurial business, it's about what we can learn from those businesses to improve virtually everything we do. It's ultimately an answer to the question 'How can we learn more quickly what works, and discard what doesn't?