The Lean Startup

Eric Ries founded his startup, IMVU, and made every mistake possible. The Lean Startup documents the methodology he developed to avoid those mistakes at the next company. Its central concept is the build-measure-learn feedback loop: build a minimum viable product (MVP), measure how real customers behave, learn whether your hypothesis was correct, then decide to persevere or pivot.

The MVP idea is counterintuitive: you want to launch the simplest version of your product that lets you test a hypothesis—not the polished version you're proud of. Early failure is a feature, not a bug. "Validated learning" replaces vanity metrics (total users, revenue) with actionable metrics (conversion rates, retention).

Ries distinguishes two types of pivots: zoom-in (a feature becomes the product) and zoom-out (the product becomes one feature of something bigger). The book's framework applies not just to startups but to any project where the problem and solution are both unknown—which describes most innovation.

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