Ergonomics in design for usability
Proceedings of the Second Conference of the British Computer Society, human computer interaction specialist group on People and computers: designing for usability
Unified theories of cognition
Measuring usability: preference vs. performance
Communications of the ACM
IBM computer usability satisfaction questionnaires: psychometric evaluation and instructions for use
International Journal of Human-Computer Interaction
Narrowing the specification-implementation gap in scenario-based design
Scenario-based design
The effect of computer experience on subjective and objective software usability measures
CHI '95 Conference Companion on Human Factors in Computing Systems
A quantitative model of the learning and performance of text editing knowledge
CHI '85 Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
Measuring usability: are effectiveness, efficiency, and satisfaction really correlated?
Proceedings of the SIGCHI conference on Human Factors in Computing Systems
Computer science as empirical inquiry: symbols and search
Communications of the ACM
Global-software development lifecycle: an exploratory study
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
Usability Engineering
Information Processing and Human-Machine Interaction: An Approach to Cognitive Engineering
Information Processing and Human-Machine Interaction: An Approach to Cognitive Engineering
The Psychology of Human-Computer Interaction
The Psychology of Human-Computer Interaction
A Practical Guide to Usability Testing
A Practical Guide to Usability Testing
Proceedings of the 25th International Conference on Software Engineering
Journal of the American Society for Information Science and Technology
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No systematic empirical study on investigating the effects of performing task variants on user cognitive strategy and behaviour in usability tests and on learnability of the system being tested has been documented in the literature. The current use-inspired basic research work aims to identify the underlying cognitive mechanisms and the practical implications of this specific endeavour. The focus of our work was to assess user rationality and system learnability. The software application tested was a multilingual learning resource repository. Eleven German and eleven Slovenian participants were involved in two user tests (UTs). Usability problems (UPs) identified in two quasi-isomorphic tasks were categorized with respect to a scheme of associated skills. Actions of the two tasks of each of the 22 users were segmented and coded according to a scheme of cognitive activities. Results showed that generally the users adopted different strategies for working out the given task and its variant, and that the system could be proved learnable. User Rational Action Model and implications for future research on user tests are inferred.