# Usability problem

A place where a person is slowed, confused or stopped.

**Source:** “After the first study with five participants has found 85% of the usability problems” [Why You Only Need to Test with 5 Users (Nielsen Norman Group)](https://www.nngroup.com/articles/why-you-only-need-to-test-with-5-users/)

See also: [L](/reference/glossary/l).

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Published 2026-10-29. Web page: https://www.mackenziebowes.com/reference/glossary/usability-problem