Usability Objectives

Rubin's four dimensions for evaluating usability (pp. 18-19)

1. Usefulness
2. Effectiveness (ease of use)
3. Learnability
4. Attitude (likeability)

This list has been revised for the new edition (pp. 4 - 6):

1. Usefulness
2. Efficiency
3. Effectiveness
4. Learnability
5. Satisfaction
6. Accessibility

Discussion questions

• What are common alternative names for these objectives?
• How can these objectives be measured or verified?
• The revised edition implies there is a distinction between efficiency and effectiveness? Is there one? Can an application be efficient but not effective?
• Are any missing from these lists?