This document discusses the importance of the feedback loop when building an MVP. It outlines the 5 Ws (What, Why, Who, Where, When) that founders should consider when analyzing feedback. The 5 Ws help determine goals, reasons for projects, appropriate users to collect feedback from, where users spend their time, and how much data is needed before making decisions. The document also recommends tools for the feedback loop like Google Analytics, Crazy Egg, Survey Monkey and human-to-human contact, and emphasizes continuously collecting data, validating the business model, and never stopping analysis.