Effektiviteti gränssnitt : Mentalamodellers inverkan på klickkostnad
Sammanfattning: Efficiency as a part of usability is a much researched topic. How we design user interfaces though, is often a matter of convention rather than scientifically validated patterns. There is however a reason for this; research has shown that users form clear mental models, or expectations of how an interface should look and work. Designing with these models in mind should therefore yield efficient results according to some researchers. This study aimed to test the extent to which these models affect efficiency through a quantitative quasi-experiment. The experiment was designed to measure click cost while designing for, or contrary to, the mental models. This was achieved by adding or subtracting the variables: placement conventions, saliency, clutter, appearance conventions and help text to an experimental group and a control group respectively. To ascertain the impact of these independent variables the click cost in milliseconds has been recorded in a web questionnaire environment, aggregated and comparatively analyzed between the groups. The result is a clearer picture of each variables independent effect on click costs and efficiency. The main result show a tendency towards higher click costs for badly handled placement conventions, saliency and appearance conventions, however the differences are small. In the case of clutter no increase in click cost could be recoded. The single largest increase in click cost is incurred when help texts are omitted.
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