Idea validation is the practice of testing whether a startup idea has real demand before committing the time and money to build it. The opposite of "build it and they will come", instead, you find evidence that they’ll come, then you build.
Why it matters
Most failed startups don’t fail because the team couldn’t execute. They fail because they executed perfectly on the wrong idea. Validation is the cheap insurance against that specific failure mode.
The classic validation tests, in order of cost: a one-line problem statement people nod at, ten interviews where the problem comes up unprompted, a landing page that captures real pre-orders or wait-list signups, and finally an MVP small enough to ship in a week so you can watch real users actually use it.
Common mistakes
- Validating with friends and family. They’ll tell you it’s a great idea. Their opinion is worth less than the time it cost to ask.
- Conflating "stated interest" with "intent to pay." People say "I’d use that!" and don’t. Asking for a credit card filters honest signal from polite signal.
- Skipping validation because the idea "obviously" works. The obvious-to-the-founder ideas are the ones that fail most often, because nobody pushed back early.
- Validating forever. Two clear "yes" signals, pre-paid customers, say, should trigger building, not more research.