The XAOS metric: understanding visual complexity as measure of usability

  • Authors:
  • Christian Stickel;Martin Ebner;Andreas Holzinger

  • Affiliations:
  • Department of Social Learning, Graz University of Technology, Graz;Department of Social Learning, Graz University of Technology, Graz;Research Unit HCI4MED, Institute for Medical Informatics, Statistics and Documentation, Medical University Graz, Graz

  • Venue:
  • USAB'10 Proceedings of the 6th international conference on HCI in work and learning, life and leisure: workgroup human-computer interaction and usability engineering
  • Year:
  • 2010

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Abstract

The visual complexity of an interface is a crucial factor for usability, since it influences the cognitive load and forms expectations about the subjacent software or system. In this paper we propose a novel method that uses entropy, structure and functions, to calculate the visual complexity of a website. Our method is evaluated against a well known approach of using the file size of color jpeg images for determining visual complexity. Both methods were applied on a dataset consisting of images of 30 different websites. These websites were also evaluated with a web survey. We found a strong correlation for both methods on subjective ratings of visual complexity and structure. This suggests both methods to be reliable for determination of visual complexity.