Science and vision are not opposites or even at odds. They need each other. I sometimes hear other startup folks say something along the lines of: 'If entrepreneurship was a science, then anyone could do it.' I'd like to point out that even science is a science, and still very few people can do it, let alone do it well.

What if we found ourselves building something that nobody wanted? In that case what did it matter if we did it on time and on budget?

By the time that product is ready to be distributed widely, it will already have established customers.

New Customers come from the action of past customers

Entrepreneurs can't forecast accurately, because they are trying something fundamentally new. So they will often be laughably behind plan - and on the brink of success.

The Lean Startup has evolved into a movement that is having a significant impact on how companies are built, funded and scaled.

If you can’t out iterate someone who is trying to copy you, you’re toast anyway.