The Lean Startup works only if we are able to build an organization as adaptable and fast as the challenges it faces. - Eric Ries

Thus, the right way to think about the product development process in a Lean Startup is that it is responding to pull requests in the form of experiments that need to be run.

This is an important rule: a good design is one that changes customer behavior for the better.

lazy registration is considered one of the design best practices for online services. In this system, customers do not have to register for the service up front. Instead, they immediately begin using the service and are asked to register only after they have had a chance to experience the service’s benefit.