CARNEIRO, M. I. F.; http://lattes.cnpq.br/7340449396696062; CARNEIRO, Maria Isabel Farias.
Resumo:
Voice interaction design per se does not provide quality assurance of the
interactive process for visually impaired users. In this dissertation, a
method for evaluating voice user interface (VUI) accessibility based upon
a set of techniques already well-known to the HCI (Human-Computer
Interaction) community is proposed. For each technique, the problem is
focused from a different perspective: (i) the user's perspective, which is
expressed as views on the product gathered from an inquiry-based
approach; (ii) the specialist's perspective, which is expressed by the
analysis of the performance results in accessibility testing sessions; and
(iii) the accessibility community's perspective, which is expressed by
design reviews to determine whether a user interface design conforms to
standards. Additionally, Bayesian networks were used in order to make
explicit the uncertainty inherent in conformity inspection processes. A case
study with DOSVOX system was performed to validate the proposed
approach. DOSVOX system was developed at Federal University of Rio de
Janeiro (UFRJ) with the aim of helping visually impaired users use the
computer. A conformity inspection was performed in accordance with
parts 14 (Menu dialogues), 17 (Form-filling dialogues) 171 (Guidance on
software accessibility) of ISO 9241. On the other hand, the user
performance measurement and the user subjective satisfaction
measurement were conducted via accessibility testing. One hundred
subjects were enrolled in this study. First, they were categorized as blind
(40 users), low vision (20 users) and non-visually impaired (40 users),
according to their visual impairment. Second, they were grouped as
novices (46 users) and intermediates (54 users), according to their
knowledge level in Informatics and experience with the evaluated product.
Accessibility test results were statistically analyzed in order to verify the
correlation between category performances and between group performances. No statistically significant differences between the user
categories or the user groups were found. On the other hand, data
comparison showed that the three strategies adopted (user performance
measurement, user satisfaction measurement and standard conformity
inspection) add to the evaluation process, producing complimentary data
that are significant to the process, and reinforcing the relevance of a
multi-layered approach for the accessibility evaluation of voice user
interfaces.