1.3 Usability in use
The degree to which specified users can achieve specified goals with effectiveness in use, efficiency in use and satisfaction in use in a specified context of use.
[based on ISO 9241-11]
1.3.1 Effectiveness in use
The degree to which specified users can achieve specified goals with accuracy and completeness in a specified context of use.
1.3.2 Efficiency in use
The degree to which specified users expend appropriate amounts of resources in relation to the effectiveness achieved in a specified context of use.
NOTE Relevant resources can include time to complete the task, the user’s effort, materials or the financial cost of usage.
1.3.3 Satisfaction in use
The degree to which users are satisfied in a specified context of use.
Satisfaction is further subdivided into sub-sub-characteristics:
• Likability (cognitive satisfaction)
• Pleasure (emotional satisfaction)
• Comfort (physical satisfaction)
• Trust
NOTE Satisfaction is the user’s response to interaction with the product, and includes attitudes towards use of the product.
1.3.4 Usability in use compliance
Adherence to standards or conventions relating to usability.
1.4 Flexibility in use
The degree to which the product is usable in all potential contexts of use.
1.4.1 Context conformity in use
The degree to which usability in use meets requirements in all the intended contexts of use.
1.4.2 Context extendibility in use
The degree of usability in use in contexts beyond those initially intended.
Note 1 Context extendibility can include providing usability for additional user groups, tasks and cultures.
Note 2 This enables products to take account of circumstances, opportunities and individual preferences that may not have been anticipated in advance.
1.4.3 Accessibility in use
The degree of usability in use for users with specified disabilities.
NOTE This includes disabilities associated with ageing.
1.4.4 Flexibility in use compliance
Adherence to standards or conventions relating to flexibility.
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