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Evaluating system utility and conceptual fit using CASSM

Blandford, A., Green, T. R. G., Furniss, D. and Makri, S. (2008). Evaluating system utility and conceptual fit using CASSM. International Journal of Human-Computer Studies, 66(6), pp. 393-409. doi: 10.1016/j.ijhcs.2007.11.005

Abstract

There is a wealth of user-centred evaluation methods (UEMs) to support the analyst in assessing interactive systems. Many of these support detailed aspects of use – for example: Is the feedback helpful? Are labels appropriate? Is the task structure optimal? Few UEMs encourage the analyst to step back and consider how well a system supports users’ conceptual understandings and system utility. In this paper, we present CASSM, a method which focuses on the quality of ‘fit’ between users and an interactive system. We describe the methodology of conducting a CASSM analysis and illustrate the approach with three contrasting worked examples (a robotic arm, a digital library system and a drawing tool) that demonstrate different depths of analysis. We show how CASSM can help identify re-design possibilities to improve system utility. CASSM complements established evaluation methods by focusing on conceptual structures rather than procedures. Prototype tool support for completing a CASSM analysis is provided by Cassata, an open source development.

Publication Type: Article
Publisher Keywords: CASSM, usability evaluation methods, conceptual structures, co-evolution
Subjects: Q Science > QA Mathematics > QA76 Computer software
Z Bibliography. Library Science. Information Resources > Z665 Library Science. Information Science
Departments: School of Mathematics, Computer Science & Engineering > Computer Science > Human Computer Interaction Design
URI: http://openaccess.city.ac.uk/id/eprint/2354
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