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    The Damage Index: An aggregation tool for usability problem prioritisation

    People and Computers XXIV Games are a Serious Business

    Proceedings of HCI 2010
    The 24th British HCI Group Annual Conference
    University of Abertay, Dundee, UK

    6 - 10 September 2010


    Gavin Sim and Janet Read


    The aggregation of usability problems is an integral part of a usability evaluation. Numerous problems can be revealed and given that there are usually limited resources for fixing or redesigning the system then prioritisation of the problem set is essential. This paper examines the prioritisation of usability problems from a single heuristic evaluation and multiple heuristic evaluations of Questionmark Perception, a computer assisted assessment application widely used within educational institutions. Two different methods for prioritisation are critiqued; one based on the severity ratings alone and the other on a Damage Index formula proposed by the authors. The results highlight the difference in ranking of problems dependent upon the approach taken. The Damage Index offers a method of systematically prioritising the usability problems in a repeatable way, removing subjectivity from this process, therefore offering improvements over just the reliance upon the severity ratings alone.


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