Summary
The Lean Startup is a framework for discovering what customers actually value by running rapid experiments. Instead of long plans, teams iterate through the Build → Measure → Learn loop to converge on product/market fit faster and with less waste.
Core Loop
Ideas → Build → Product → Measure → Data → Learn → (pivot or persevere)
Key Insights
The Build–Measure–Learn Loop
| Step | Goal | Example Metrics |
|---|---|---|
| Build | Create the smallest test (MVP) | Time to MVP, scope reduced |
| Measure | Capture behavior and signal | Activation, retention, NPS, task success |
| Learn | Decide to pivot or persevere | Clear hypothesis decisions, learning velocity |
Types of Pivots
| Pivot | What Changes | When To Use |
|---|---|---|
| Zoom-In | Feature becomes the product | One feature gets all the traction |
| Zoom-Out | Product becomes a feature | Users want a broader solution |
| Customer Segment | Same problem, new user | Adoption clusters elsewhere |
| Channel | Same product, new channel | Distribution blocks growth |
Practical Applications
Team Operating System
Weekly ExperimentsDecision LogsMVP Discipline
North-Star MetricKill Criteria
Favorite Quotes
“The only way to win is to learn faster than anyone else.”
“What if we built only what we could measure?”
Rating and Recommendation
I rate this book 4/5. It’s the default operating system for high-uncertainty product work. Pair with customer interviews and strong product discovery.
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