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In CHI '98: CHI 98 conference summary on Human factors in computing systems (1998), pp. 255-256, doi:10.1145/286498.286737 Key: citeulike:4644434
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Usability tests are applied in industry to evaluate systems and in research as a yardstick for other usability evaluation methods. However, one potential threat to the reliability of usability tests has been letI unaddressed: the evaluator effect. In this study, four evaluators analyzed four videotaped usability test sessions. Only 20% of the 93 unique problems were detected by all four evaluators and 46% were detected by only a single evaluator. Severe problems were detected more often by all four evaluators (41%) and less often by only one evaluator (22%) but a substantial evaluator effect remained.
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