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Diagnostic |
Validation |
| Goal | Find design deficiencies | Show that the system is usable |
| Development process | Prototype approval during the alpha testing |
Prerequisite for system deployment, Part of the product marketing campaign |
| Means | Usability failure detection and analysis | Scoring, rating ... |
| Number of users | 3-7 users | 50-100 users |
| Tester's task | Observe user difficulties | Measure user performance (time and error rates) |
| References | Examples: | The only reference I know is ISO 20282 |