Istituto di Scienza e Tecnologie dell'Informazione     
Leporini B., Paterṇ F. Applying Web Usability Criteria for Vision-Impaired Users: Does It Really Improve Task Performance?. In: International Journal of Human-Computer Interaction, vol. 24 (1) pp. 17 - 47. Taylor & Francis, 2008.
Available accessibility guidelines do not necessarily guarantee usable Web sites, particularly when specific groups of users with special needs are considered. We have identified 15 Web design criteria aiming to provide integrated support of accessibility and usability for vision-impaired users. In this article, we present the results of a study investigating whether the application of such guidelines for vision-impaired users can actually improve their task performance when accessing Web applications. We report on two user tests, both involving vision-impaired users, that aim to provide empirical validation of the design criteria. During each test, users had to access and navigate two versions of a Web site, one version supporting the selected design criteria and one obtained with traditional techniques. Our results indicate that the 15 design criteria improved Web site usability both quantitatively and qualitatively by reducing the navigation time needed to perform the assigned tasks and by making the Web sites easier to navigate for blind and low-vision users.
URL: http://www.informaworld.com/smpp/title~content=t775653655
DOI: 10.1080/10447310701771472
Subject accessibility
user testing
H.5.2 User Interfaces

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