Istituto di Scienza e Tecnologie dell'Informazione     
Vigo M., Leporini B., Paterṇ F. Enriching Web information scent for blind users. In: ASSETS 2009 - ACM SIGACCESS Conference on Assistive Technologies (Pittsburgh, Pennsylvania, USA, 25-28 October 2009). Proceedings, pp. 123 - 130. ACM, 2009.
Link annotation with the accessibility level of the target Web page is an adaptive navigation support technique aimed at increasing blind users' orientation in Web sites. In this work, the accessibility level of a page is measured by exploiting data from evaluation reports produced by two automatic assessment tools. These tools support evaluation of accessibility and usability guideline-sets. As a result, links are annotated with a score that indicates the conformance of the target Web page to blind user accessibility and usability guidelines. A user test with 16 users was conducted in order to observe the strategies they followed when links were annotated with these scores. With annotated links, the navigation paradigm changed from sequential to browsing randomly through the subset of those links with high scores. Even if there was not a general agreement on the correspondence between scores and user perception of accessibility, users found annotations helpful when browsing through links related to a given topic.
URL: http://portal.acm.org/toc.cfm?id=1639642&idx=SERIES368&type=proceeding&coll=ACM&dl=ACM&part=series&WantType=Proceedings&title=ASSETS&CFID=60988474&CFTOKEN=79222182
DOI: http://doi.acm.org/10.1145/1639642.1639665
Subject Measurement
Human Factors
Information scent
Web accessibility
Blind users
Adaptive navigation
H.1.2 User/Machine Systems. Human factors
H.5.2. User Interfaces. Evaluation
H.5.4. Hypertext/Hypermedia. User issues
K.4.2 Social Issues. Assistive technologies for persons with disabilities

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