Usability Objectives (Revisited)
For this class, we will standardize on the following definitions:
- Utility (aka usefulness). Is this something people want to do?
- Learnability. Is this something that people are able to do?
- Efficiency. Is this something people can do quickly (assuming they are already able to do it)?
- Effectiveness. Is this something people can do well?
- Satisfaction. Is this something people enjoy doing?
Note that learnability and efficiency can be directly observed in usability tests.
Effectiveness probably requires a rubric to assess the quality of the result.
Errors may affect learnability, efficiency and effectiveness.
Other dimensions such as accessibility are important but are not emphasized in this class.