Evaluating system utility and conceptual fit using CASSM.
INT J HUM-COMPUT ST
393 - 409.
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.
|Title:||Evaluating system utility and conceptual fit using CASSM|
|Open access status:||An open access version is available from UCL Discovery|
|Keywords:||CASSM, usability evaluation methods, conceptual structures, co-evolution, USABILITY EVALUATION METHODS, KNOWLEDGE, DESIGN|
|UCL classification:||UCL > School of Life and Medical Sciences > Faculty of Brain Sciences > Psychology and Language Sciences (Division of) > UCL Interaction Centre
UCL > School of BEAMS > Faculty of Engineering Science > Computer Science
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