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Usability - ISO 9241 definition

The effectiveness, efficiency and satisfaction with which specified users achieve specified goals in particular environments.

effectiveness: the accuracy and completeness with which specified users can achieve specified goals in particular environments
efficiency: the resources expended in relation to the accuracy and completeness of goals achieved
satisfaction: the comfort and acceptability of the work system to its users and other people affected by its use

 toddler using a computer with ease

Marja & Matt

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