How to go into practice?
The feedback that a startup receives in its experiments
can be qualitative (which product options they like and which they don't)
or quantitative (how many customers use the product, the number of registered users).
The Lean Startup concept is based on a Build-Measure-Learn feedback loop.
The most important challenge of startup management is to strive to reduce the feedback cycle time. But all the elements of this cycle deserve equal attention.