ISO 924-11 (HCI)
The usability of a product is the degree to which specific users can achieve specific goals within a particular environment, effectively, efficiently, comfortably, and in an acceptable manner.
ISO 9126-1 (Software Engineering)
The capability of the software product to be understood, learned, operated, attractive to the users, and compliant to conditions.
These combined determine usability: task, system, & user
- Task characteristics:
- frequency: number of times a task is performed by a user.
- Considerations include routine and infrequent tasks
- System functions:
- ease of learning: effort required to understand and operate a system
- ease of user: the effort that is required to operate a system once it has been understood and mastered by the user
- User Characteristics: