UCL logo

UCL Discovery

UCL home » Library Services » Electronic resources » UCL Discovery

Evaluating system utility and conceptual fit using CASSM

Blandford, A; Furniss, D; Makri, S; Green, TRG; (2008) Evaluating system utility and conceptual fit using CASSM. International Journal of Human Computer Studies , 66 (6) 393 - 409. 10.1016/j.ijhcs.2007.11.005. Green open access

[img]
Preview
PDF - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
578Kb

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. © 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
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

View download statistics for this item

Archive Staff Only: edit this record