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User involved usability assessments during design processes improve the quality of the final product. These assessments take place with design models (e.g. drawings or foam models). Empirical studies yielded methodological recommendations. The design models should represent relevant characteristics of the design, such as innovative aspects, and designed use cues. Interactivity of the models is key, but this can already be achieved with a series of simple drawings. To get lifelike interactions during the user trials, participants should be given meaningful tasks, and they should be encouraged to use all means of expression, such as thinking aloud and gesturing. Furthermore, research showed that the involved practitioners make or break the assessment. Important factors are their observation sensitivity and their judgmental skills in filtering out artificial problems. They should also understand the limitations of these user trials in the lab, and combine them with other methods of user research.
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