At the root of every seemingly technical problem is a human problem. Five Whys provides an opportunity to discover what that human problem might be. - Eric Ries

If a competitor can outexecute a startup once the idea is known, the startup is doomed anyway. The reason to build a new team to pursue an idea is that you believe you can accelerate through the Build-Measure-Learn feedback loop faster than anyone else can.

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

Getting a startup’s engine of growth up and running is hard enough, but the truth is that every engine of growth eventually runs out of gas. Every engine is tied to a given set of customers and their related habits, preferences, advertising channels, and interconnections. At some point, that set of customers will be exhausted.