J Biomed Inform - Classification and prioritization of usability problems using an augmented classification scheme.

Tópicos

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Resumo

Various methods exist for conducting usability evaluation studies in health care. But although the methodology is clear, no usability evaluation method provides a framework by which the usability reporting activities are fully standardized. Despite the frequent use of forms to report the usability problems and their context-information, this reporting is often hindered by information losses. This is due to the fact that evaluators' problem descriptions are based on individual judgments of what they find salient about a usability problem at a certain moment in time. Moreover, usability problems are typically classified in terms of their type, number, and severity. These classes are usually devised by the evaluator for the purpose at hand and the used problem types often are not mutually exclusive, complete and distinct. Also the impact of usability problems on the task outcome is usually not taken into account. Consequently, problem descriptions are often vague and even when combined with their classification in type or severity leave room for multiple interpretations when discussed with system designers afterwards. Correct interpretation of these problem descriptions is then highly dependent upon the extent to which the evaluators can retrieve relevant details from memory. To remedy this situation a framework is needed guiding usability evaluators in high quality reporting and unique classification of usability problems. Such a framework should allow the disclosure of the underlying essence of problem causes, the severity rating and the classification of the impact of usability problems on the task outcome. The User Action Framework (UAF) is an existing validated classification framework that allows the unique classification of usability problems, but it does not include a severity rating nor does it contain an assessment of the potential impact of usability flaws on the final task outcomes. We therefore augmented the UAF with a severity rating based on Nielsen's classification and added a classification for expressing the potential impact of usability problems on final task outcomes. Such an augmented scheme will provide the necessary information to system developers to understand the essence of usability problems, to prioritize problems and to tackle them in a system redesign. To investigate the feasibility of such an augmented scheme, it was applied to the results of usability studies of a computerized physician order entry system (CPOE). The evaluators classified the majority of the usability problems identically by use of the augmented UAF. In addition it helped in differentiating problems that looked similar but yet affect the user-system interaction and the task results differently and vice versa. This work is of value not only for system developers but also for researchers who want to study the results of other usability evaluation studies, because this scheme makes the results of usability studies comparable and easily retrievable.

Resumo Limpo

various method exist conduct usabl evalu studi health care although methodolog clear usabl evalu method provid framework usabl report activ fulli standard despit frequent use form report usabl problem contextinform report often hinder inform loss due fact evalu problem descript base individu judgment find salient usabl problem certain moment time moreov usabl problem typic classifi term type number sever class usual devis evalu purpos hand use problem type often mutual exclus complet distinct also impact usabl problem task outcom usual taken account consequ problem descript often vagu even combin classif type sever leav room multipl interpret discuss system design afterward correct interpret problem descript high depend upon extent evalu can retriev relev detail memori remedi situat framework need guid usabl evalu high qualiti report uniqu classif usabl problem framework allow disclosur under essenc problem caus sever rate classif impact usabl problem task outcom user action framework uaf exist valid classif framework allow uniqu classif usabl problem includ sever rate contain assess potenti impact usabl flaw final task outcom therefor augment uaf sever rate base nielsen classif ad classif express potenti impact usabl problem final task outcom augment scheme will provid necessari inform system develop understand essenc usabl problem priorit problem tackl system redesign investig feasibl augment scheme appli result usabl studi computer physician order entri system cpoe evalu classifi major usabl problem ident use augment uaf addit help differenti problem look similar yet affect usersystem interact task result differ vice versa work valu system develop also research want studi result usabl evalu studi scheme make result usabl studi compar easili retriev

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