ISO Definition of Quality of Use
The ISO 9241 standard defines three components of "quality of use" applicable to the design of user interfaces:
- Effectiveness Does the product do what the users require? Does it "do the right thing?"
- Efficiency Can the users learn the user interface quickly? Can they carry out their tasks with minimum expended effort, including a minimum of errors? Does it improve the productivity/effort ratio? Does it "do things right?"
- Satisfaction Do users express satisfaction with the product? Does the new product reduce stress? Do the end users now have a more satisfying job?