ISO9241

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Extent to which a product can be used by specified users to achieve specified goals with effectiveness, efficiency and satisfaction in a specified context of use.

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• Effectiveness��ͭ����)

  Accuracy and completeness with which users achieve specified goals

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• Efficiency�ʸ�Ψ)

  Resources expended in relation to the accuracy and completeness with which users achieve goals

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• Satisfaction����­��)

  Freedom from discomfort, and positive attitudes towards the use of the product

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• Context of use

  Users, tasks, equipment(hardware, software and materials), and the physical and social environments in which a product is used

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