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Evaluating system utility and conceptual fit using CASSM

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. Green open access

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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.

Type: Article
Title: Evaluating system utility and conceptual fit using CASSM
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.ijhcs.2007.11.005
Keywords: CASSM, usability evaluation methods, conceptual structures, co-evolution, USABILITY EVALUATION METHODS, KNOWLEDGE, DESIGN
UCL classification: UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > Div of Psychology and Lang Sciences > UCL Interaction Centre
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Computer Science
URI: https://discovery.ucl.ac.uk/id/eprint/5099
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