![]() ![]() ![]() ![]() Prioritization For a given tool under evaluation, several usability goals are defined. Thus, risks that may result in use errors must be identified and then, for each of them, usability goals must be defined, taking into account the severity of the potential consequences of the risk (for instance, in terms of operator, patient or environment safety). This kind of “safety-oriented usability goal” is used to prevent a tool being released on the market while identifying deficiencies in its interface design that could induce. Business goals Moreover, for certain types of products that are used for sensitive purposes (for instance, medical devices or nuclear plant control interface), usability goals must be defined in close relation to the process of those products. The tasks that the different categories of identified end-users are supposed to perform with the tested system in a given context of use (results from a Contextual Task Analysis). More practically, Mayhew proposes that their definition should refer to. Their definition, for each of those components, must rest on the characteristics of the tasks that the tested system is supposed to support.
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