quality in use
quality of worksystem in use
The difference between usability and quality of a worksystem in use is a matter of focus. When usability is evaluated, the focus is on improving a product while the other components of the worksystem (user, task, equipment and environment) are treated as given.
3 definitions were found:
The capability of the software product to be understood, learned, used and attractive to the user, when used under specified conditions. The components of usability are: understandability, learnability, operability, attractiveness, compliance.
ISO/IEC 9126-1 (CD proposal)
The extent to which a product can be used by specific users to achieve specified goals with effectiveness, efficiency and satisfaction in a specified context of use.
A set of attributes that bear on the effort needed for use, and on individual assessment of such use, by stated or implied set of users.
ISO 12119 (CD proposal)
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