- Formative - to see the process and the result
- Summative - at the end of evaluation phase
Why need to do an evaluating?
- Learnability: How easy is it for users to accomplish basic tasks the first time they encounter the design?
- Efficiency: Once users have learned the design, how quickly can they perform tasks?
- Memorability: When users return to the design after a period of not using it, how easily can they reestablish proficiency?
- Errors: How many errors do users make, how severe are these errors, and how easily can they recover from the errors?
- Satisfaction: How pleasant is it to use the design?
Evaluation Procedure:
- one-to-one
- small group
- field testing
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