Blandford, A; Green, TRG; Furniss, D; Makri, S; (2008) Evaluating system utility and conceptual fit using CASSM. INT J HUM-COMPUT ST , 66 (6) 393 - 409. 10.1016/j.ijhcs.2007.11.005.

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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 tile 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. (c) 2007 Elsevier Ltd. All rights reserved.

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