5 user tests finds 85% problems
![5 user tests finds 85% problems - Sketchplanations](https://images.prismic.io/sketchplanations/e10f4d9a-377f-4a82-bc38-965a8b259c2f_61249752387.jpg?auto=compress%2Cformat&fit=max&w=3840&q=50)
Classic rule of thumb from Jakob Nielsen. Probably the most useful corollary is if you can afford 15 tests, tests 5 users 3 times each and iterate the design in between.
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