The research presented in this paper aim is to create a heuristic set of indicators to evaluate the accessibility of statistical charts focusing on the needs of people with low vision and CVD. Despite numerous advances in the field of digital accessibility, charts are still a challenge for people with low vision and color vision deficiency (CVD) and create barriers that hinder their accessibility. Purpose: Statistical charts have an important role in conveying, clarifying and simplifying information, and have a significant presence in fields such as education, scientific research or journalism. The results therein revealed that the ACKMS outperform both MCKMS and VCKMS with regard to effectiveness, efficiency and the user's trust and knowledge. The three experimental systems were evaluated by three independent groups of twenty users each n=60 who performed eight common tasks of increasing complexity and design based on three different styles. As a result, an empirical investigation was carried out by implementing avatars-enhanced multimodal E-CKMS ACKMS and comparing it with the text with graphics E-CKMS VCKMS and anther multimodal E-CKMS MCKMS that incorporated speech, earcons and auditory icons. Although the implementation of E-CKMS encounters several challenges, such as the lack of trust and information overload, few empirical studies were devoted to examine the role of metaphors of audio-visual nature. This paper describes a comparative evaluation study carried out to assess the effect of incorporating avatars with facial expressions into interfaces of Electronic Customer Knowledge Management Systems E-CKMS on not only usability of E-CKMS, but also the user's trust and knowledge. The paper concludes with a discussion on the implications of the results, the role of context and the use of structured musical stimuli to communicate graphical information to visually impaired users. The results indicated that perceptual context played an important role in the interpretation of the structured musical stimuli that communicated simple diagrams. Meaningfully arranged graphical shapes (at least for the visual sense) were communicated in the absence, and in the presence of a particular perceptual context or different perceptual contexts. Under this platform, simple arrangements of shapes (forming diagrams) were communicated to users using structured musical stimuli. An experimental framework program (called AudioGraph) provided a platform for investigating musical information processing for blind users. The results from previous experiments using structured musical stimuli to communicate coordinate locations within a graphical grid, navigation of an auditory cursor and simple shapes are used as a basis for further exploratory research to communicate diagrams.
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