User Testing
Letter UEvaluation of a product with real users to validate usability, comprehension, and satisfaction.
Updated:
Working definition
User testing (usability testing) observes real people using a product or prototype to surface usability issues before launch.
Modes by phase
- Exploratory: understand mental models and vocabulary.
- Evaluative: measure whether a specific task completes successfully.
- Comparative: A/B two variants with clear metrics.
Practical rule
Five users often reveal most severe issues in a focused flow; the value is in iterating, not the magic number.