Refining the test phase of usability evaluation: how many subjects is enough?
Human Factors - Special issue: measurement in human factors
Finding usability problems through heuristic evaluation
CHI '92 Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
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
The cognitive walkthrough method: a practitioner's guide
Usability inspection methods
CHI '02 Extended Abstracts on Human Factors in Computing Systems
The Usability Problem Taxonomy: A Framework for Classificationand Analysis
Empirical Software Engineering
Testing web sites: five users is nowhere near enough
CHI '01 Extended Abstracts on Human Factors in Computing Systems
The human-computer interaction handbook
Damaged merchandise? a review of experiments that compare usability evaluation methods
Human-Computer Interaction
A pattern-based usability inspection method: first empirical performance measures and future issues
BCS-HCI '07 Proceedings of the 21st British HCI Group Annual Conference on People and Computers: HCI...but not as we know it - Volume 2
Heterogeneity in the usability evaluation process
BCS-HCI '08 Proceedings of the 22nd British HCI Group Annual Conference on People and Computers: Culture, Creativity, Interaction - Volume 1
Heuristic Evaluations of Bioinformatics Tools: A Development Case
Proceedings of the 13th International Conference on Human-Computer Interaction. Part I: New Trends
Evaluation criteria for assessing the usability of ERP systems
Proceedings of the 2009 Annual Research Conference of the South African Institute of Computer Scientists and Information Technologists
Controlling the usability evaluation process under varying defect visibility
Proceedings of the 23rd British HCI Group Annual Conference on People and Computers: Celebrating People and Technology
Measuring web usability using item response theory: Principles, features and opportunities
Interacting with Computers
Journal of Biomedical Informatics
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Usability evaluation methods have a long history of research. Latest contributions significantly raised the validity of method evaluation studies. But there is still a measurement model lacking that incorporates the relevant factors for inspection performance and accounts for the probabilistic nature of the process. This paper transfers a modern probabilistic approach from psychometric research, known as the Item Response Theory, to the domain of measuring usability evaluation processes. The basic concepts, assumptions and several advanced procedures are introduced and related to the domain of usability inspection. The practical use of the approach is exemplified in three scenarios from research and practice. These are also made available as simulation programs.