For a system which is operated by a user, the combination of functionality, reliability, usability and efficiency can be measured by quality of use. [ISO/IEC 9126-1 (draft)]
2 definitions were found:
The resources expended in relation to the accuracy and completeness with which users achieve goals.
The capability of the software product to provide appropriate performance, relative to the amount of resources used, under stated conditions.
ISO/IEC 9126-1 (draft)
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