3.8 Build → Measure → Learn (Feedback Loop)

Once you have an MVP and start experimenting, follow the build-measure-learn loop. This is the engine of Lean Startup. You build something (MVP or a new feature), measure the results with real customers (metrics, interviews, analytics), and learn whether to pivot or persevere.

Collect both quantitative feedback (signups, conversion rates, usage stats) and qualitative feedback (comments, survey answers). Lean Startup calls this process validated learning – using data from experiments to prove or disprove your hypotheses. Each cycle should bring new insights. Over time, you iterate: refine the product, fix problems, add features customers asked for, or make bigger shifts if needed. This continuous adjustment (often summarized as “iterate until PMF”) is how you avoid spending months on the wrong product.

Remember: focus on actionable metrics (those tied to customer behavior) rather than vanity metrics. A small experiment that shows, say, 10% of users are willing to pay for your service is far more valuable than getting 1,000 likes on a social post. In each cycle, aim for clear, testable outcomes. When you systematically apply feedback, you move closer to what customers actually want.