Principle #4: Learn by making, not talking.

It’s a little more complex to do things this way, but if you orient your stakeholders around dates by which you want to learn whether something matters as opposed to dates by which you want to ship features, you help create that culture of learning and validation in your company.

A disciplined team may apply the wrong methodology but can shift gears quickly once it discovers its error. Most important, a disciplined team can experiment with its own working style and draw meaningful conclusions.