What is Validation?

Validation reduces a specific uncertainty

Validation is not a permanent stamp saying an idea is good. It is evidence that helps answer one question under current conditions.

You can validate that people experience a problem without validating your solution. You can validate that people try a product without proving they will return or pay.

A ladder of evidence

Evidence becomes stronger as it approaches real behavior:

1. A person says the idea sounds interesting.
2. They describe a recent experience of the problem.
3. They give time or information to try a solution.
4. They complete the intended action.
5. They return without being reminded.
6. They exchange money, reputation, access, or sustained effort.

Every step answers a different question. Do not report curiosity as demand.

Write the decision first

Before collecting evidence, write:

I need to decide:
I currently believe:
The evidence that could change my mind is:
I will review it on:

This protects the experiment from moving its goal after the result appears.