Article

Evaluating system utility and conceptual fit using CASSM

Blandford, A. and Green, T.R.G. and 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. ISSN 10715819 06/2008; DOI: 10.1016/j.ijhcs.2007.11.005
Source: OAI

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.

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