A mathematical model of the finding of usability problems
CHI '93 Proceedings of the INTERACT '93 and CHI '93 Conference on Human Factors in Computing Systems
A Practical Guide to Usability Testing
A Practical Guide to Usability Testing
Analysis of combinatorial user effect in international usability tests
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
Instant data analysis: conducting usability evaluations in a day
Proceedings of the third Nordic conference on Human-computer interaction
Dogmas in the assessment of usability evaluation methods
Behaviour & Information Technology
Analysis in practical usability evaluation: a survey study
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
Tradeoffs in design research: development oriented triangulation
BCS-HCI '13 Proceedings of the 27th International BCS Human Computer Interaction Conference
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In usability testing, usability problems are often found for only one test participant. The literature does not help in deciding whether such single-user problems should be accepted or rejected as usability problems. To help us understand how such decisions are made in practical usability testing, 89 practitioners described how they dealt with single-user problems in their latest usability test. Single-user problems was accepted, rejected, or reported as outliers. This decision depended on problem severity, participant profile, sample size, and judgments on whether the problem is an artifact of the test situation.