Software Growth

Lean startup

The lean startup method, from Eric Ries, treats a new company as a series of experiments: build, measure and learn fast to find a model that works.

Lean startup is a way of building a new company under uncertainty. Eric Ries popularized it in his 2011 book The Lean Startup. The core claim is that a startup is not a smaller version of a big company. It is an experiment to find a business model that works, so it should be managed by learning, not by following a plan written on day one.

The five principles

The official Lean Startup site lists five:

  1. Entrepreneurs are everywhere.
  2. Entrepreneurship is management.
  3. Validated learning: test each part of your vision with experiments.
  4. Innovation accounting: track progress with metrics fit for startups.
  5. Build-measure-learn: the loop that turns ideas into products as fast as possible.

Build, measure, learn

You build the smallest thing that tests an idea, a minimum viable product. You measure how real customers respond. You learn whether to keep going or change direction. The goal is to finish the loop quickly, because the faster you learn, the less you spend on ideas that fail.

Ries ties this to the decision to pivot or persevere. If the data shows your assumption was wrong, you make a structural course correction. If it shows progress, you carry on.

Where it came from

Ries built on Steve Blank's work on customer development, which told founders to get out of the building and test their business model with customers. Lean startup combines that with agile engineering and gave the whole thing a name and a vocabulary.

Example

You think freelancers will pay $15 per month for a tool that chases late invoices. Before building it, you put up a landing page with a price and a "start trial" button, then send 300 visitors from a freelancer forum. If 12 click through to a payment step, that is a 4 percent rate. 12 divided by 300 equals 0.04. That is a sign worth building for. If only 1 clicks, the idea needs work. You spent a weekend, not six months.

Common mistakes

  • Calling anything half-built an MVP. It should test one specific question.
  • Measuring vanity numbers. Signups and page views feel good. Paid conversions and retention tell the truth.
  • Skipping customers. Experiments without conversations produce numbers with no explanation.
  • Never deciding. The loop only works if you act on what you learn.

For bootstrapped founders

Lean thinking suits bootstrappers naturally, since you cannot afford big bets. Run cheap experiments, charge early and reach product-market fit before you scale anything. Treat your cash as the experiment budget.

Related terms

Sources

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