Classification of usability problems (CUP) scheme: augmentation and exploitation

Authors:
Sigurbjörg Gróa Vilbergsdóttir;Ebba Thora Hvannberg;Effie Lai-Chong Law
Affiliations:
University of Iceland, Reykjavik, Iceland;University of Iceland, Reykjavik, Iceland;Eidgenössische Technische Hochschule Zürich, Zürich, Switzerland
Venue:
Proceedings of the 4th Nordic conference on Human-computer interaction: changing roles
Year:
2006

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Abstract

Existing defect classification schemes are mainly used to characterize software defects. A few of them are specifically applicable to usability problems, but they have not been validated and their reliability has been assessed in a limited way. The aim of this study is to evaluate comprehensively the Classification Usability Problems (CUP) scheme. First, the reliability was evaluated with raters of different levels of expertise and experience in using CUP. Second, the acceptability was assessed with a questionnaire. Third, the validity was assessed with developers in a field study. Results show that some form of training is required for inexperienced evaluators to exploit CUP fully, but a simplified version of CUP may still be useful for developers and usability practitioners. The evaluation framework employed proved effective for revising CUP and may be applied to validate other related schemes.