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The MUSiC performance measurement method

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Abstract. This paper reports a method for measuring usability in terms of task performance-achievement of frequent and critical task goals by particular users in a context simulating the work environment. The terms usability and quality in use are defined in international standards as the effectiveness, efficiency and satisfaction with which goals are achieved in a specific context of use. The performance measurement method gives measures which, in combination with measures of satisfaction, operationalize these definitions. User performance is specified and assessed by measures including task effectiveness (the quantity and quality of task performance) and User efficiency (effectiveness divided by tasktime). Measures are obtained with users performing tasks in a context of evaluation which matches the intended context of use. This can also reveal usability problems which may not become evident if the evaluator interacts with the user. The method is supported by tools which make it practical in commercial timescales. The method has been widely applied in industry, and can be adapted for use early in design, and to evaluate non-computer products and the performance of small work groups.
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Document Type: Research Article

Publication date: 1997-07-01

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