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Objective versus subjective measures of Paris Metro map usability: Investigating traditional octolinear versus all-curves schematics

Roberts, Maxwell J and Newton, Elizabeth J and Lagattolla, Fabio D and Hughes, Simon and Hasler, Megan C (2013) 'Objective versus subjective measures of Paris Metro map usability: Investigating traditional octolinear versus all-curves schematics.' International Journal of Human-Computer Studies, 71 (3). pp. 363-386. ISSN 1071-5819

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Schematic maps are an important component of assistance for navigating transport networks worldwide. By showing routes as simple straight lines, they reduce the cognitive load of journey planning, and by revealing the underlying structure of networks, they make their key features easier to identify and learn. However, although there are many suggestions for optimizing schematic maps so as to maximize these benefits, to date these have not been directly supported by published usability studies or psychological theory. In this paper, we suggest that there are circumstances in which conventional schematic maps fail to yield benefits, and we compare journey planning using the current official RATP Paris Metro map with an all-curves design which replaces straight lines and corners with gentle curves. Three separate usability studies with slightly different methodologies showed that the journey planning time for the all-curves map was better than the RATP version, with effect sizes ranging from 0.48 to 1.12. Subjective usability ratings were derived from questionnaires, and user preferences, but neither were correlated with objective usability measures. We conclude that (1) in terms of designing schematics, there is no evidence to suggest that any rule-set can be claimed to be a gold-standard, and it is important to match the design rules to the properties of the network, (2) in some circumstances, radical departures from traditional ideas can yield usability benefits, and (3) map usability appears to be distinct from map engagement, although the latter is undoubtedly important in encouraging people fully to make use of navigation aides. © 2012 Elsevier Ltd.

Item Type: Article
Uncontrolled Keywords: Schematic maps; Metro maps; Journey planning; Usability study; Cognitive load; Reasoning
Subjects: B Philosophy. Psychology. Religion > BF Psychology
Divisions: Faculty of Science and Health
Faculty of Science and Health > Psychology, Department of
SWORD Depositor: Elements
Depositing User: Elements
Date Deposited: 01 Mar 2013 09:54
Last Modified: 18 Aug 2022 11:14

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