The Lean Startup · Eric Ries

Build the smallest thing that tests your biggest assumption

Don't perfect a product nobody wants. Ship the smallest version that tests your riskiest assumption, measure what real users do, and learn — then repeat. Speed of learning is the real metric.

Ship the smallest thing that tests your biggest assumption, then build-measure-learn.

Most failed products aren't badly built — they're built beautifully for a need that wasn't really there. Eric Ries's answer in The Lean Startup is to treat a new venture as a series of experiments rather than a grand plan. Instead of spending a year perfecting your guess, you build a minimum viable product: the smallest thing that lets real people give you real feedback on the one assumption most likely to be wrong.

Then you run the loop: build, measure, learn. Put it in front of users, measure what they actually do (not what they say), and extract validated learning — evidence about whether to persevere or pivot. The point of the MVP isn't to launch small; it's to learn fast. A company that completes this loop quickly, again and again, discovers what customers truly want before it runs out of money. The real measure of progress isn't features shipped — it's how fast you're learning what works.

Why it matters

It replaces expensive guessing with cheap evidence, so you find the truth before you spend the budget.

Test yourself

What is the point of a minimum viable product?
Show answer
To learn fast — test your riskiest assumption with real users using the smallest possible build, then iterate.

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FAQ

What is a minimum viable product (MVP)?
An MVP is the smallest version of a product that lets you test your riskiest assumption with real users and gather validated learning, before investing in a full build.
What is the build-measure-learn loop?
It's the core cycle of The Lean Startup: build a small experiment, measure how real users behave, and learn whether to persevere or pivot. Going through it faster is the goal.