UCD Goals: Measuring for Success
Preece, Rogers and Sharp (former HCI 440 text) provide one of the more comprehensive lists for defining usability (p. 14):
- Effectiveness (very general concept, too vague)
- Efficiency (alt term: ease of use)
- Safety
- Utility (alt term: usefulness)
- Learnability (alt term: ease of learning)
- Memorability
Rubin (1994) four dimensions for evaluating usability (pp. 18-19)
- Usefulness
- Effectiveness (ease of use)
- Learnability
- Attitude (likeability)
Rubin and Chisnell (2008, 2nd edition) (pp. 4 - 6):
- Usefulness
- Efficiency
- Effectiveness
- Learnability
- Satisfaction
- Accessibility
Hartson and Pyla (section 1.1, first edition)
- Usability (includes much of the above lists)
- Usefulness
- Functionality (behind-the-interface system functionality)
- Emotional Impact
Hartson and Pyla (section 1.4, second edition)
- Usability (includes much of the above lists)
- Usefulness
- Emotional Impact
- Meaningfulness
My list
- Utility (provides needed functions)
- Learnability (can figure out what to do to complete task)
- Efficiency (task completion time)
- Effectiveness (produces quality result)
- User Satisfaction (do the users have a positive experience?)
- Accessibility (supports diverse users)
Discussion questions
- Are any goals missing for user experience?
- Which goals do we address in this class?
- Can satisfaction include meaningfulness? Or is meaningfulness more than that?