Design Usability Tests
Foundations & Process · research
Updated 2026-07-28
- Usability testing reveals where interfaces fail.
- Give users tasks, not instructions.
- Good task:
- "Find your last invoice and download it."
- Bad task:
- "Click the invoice button."
- Observe:
- Completion.
- Confusion.
- Time.
- Errors.
- Confidence.
- Do not explain the interface while testing.
- Confusion is the signal you are looking for.
Related guides
UX Handbook