Evaluation Objectives
My List (from first week)
- Utility (provides needed functions)
- Learnability (can figure out what to do to complete task)
- Efficiency (task completion time)
- Reliability (minimizes errors, some may call this effectiveness)
- Satisfaction
- Accessibility
Examples from Hartson and Pyla (section 10.5, 22.5 in second edition)
- Objective UX measures (directly measurable by evaluators)
- Initial performance
- Long-term performance (longitudinal, experienced, steady state)
- Learnability
- Retainability
- Advanced feature usage
- Subjective UX measures (based on user opinions)
- First impression (initial opinion, initial satisfaction)
- Long-term (longitudinal) user satisfaction
Discussion Questions
- How might H&P "performance" be defined?
- How might H&P "feature usage" be defined?
- How do you choose and refine evaluation objectives for the evaluation of your design?