The Web is now increasingly being accessed by many people with disabilities. Thus, the great heterogeneity of Web application technologies as well as the provided Web content requires the introduction of accessibility aspects in order to fulfill the preferences for all people with disabilities or not. For that reason accessibility support at all stages of the design and development process of W...

This paper studies the properties and performance of a new measure of accessibility, called the Activity-Based Accessibility (ABA) measure, and compares it to traditional measures of accessibility, including isochrone, gravity and utility-based measures. The novel aspect of the ABA is that it measures accessibility to all activities in which an individual engages and incorporates constraints su...

1. MOTIVATION Web Accessibility metrics aim at measuring in a precise (often numeric) way the conformance of a given web page with respect to a set of accessibility guidelines. Metrics rely on traditional accessibility guidelines such as WCAG or Section 508, targeting all type of users. Normally, for a more precise assessment that considers specific user groups (blind, deaf, elderly, physically...

The first part of the talk will highlight the way in which assumptions widespread in the literature on reasoning about knowledge generate the traditional philosophical problem of scepticism. The problematic assumptions to be discussed here do not include logical omniscience, but are equally serious. My particular concern will be with the so-called Brouwerian axiom: p $ K~Kp (if p is false, an a...

Designing an interactive product or service for all possible users requires consideration of more than just physical accessibility. Even if there is sufficient physical accessibility, many systems will still present major barriers to their use, in terms of cognitive accessibility: the functionality, terminology, information structure and interface style frequently confuse the intended user. Usu...

Multimedia content covers the Web, and we should provide access to all people. For this reason, we must consider including accessibility requirements in a synchronized manner with the alternative resources such as caption and audio description among others. In addition, it is very important to take into account accessibility requirements in the player to avoid barriers and to ensure access to t...

A case study on evaluating an internet city guide for accessibility and Design for All is presented, and retrofitting considerations are reported. The study can serve as an early example for the processes to come according to the new German legislation demanding equal access to information systems for people with disabilities. Some conclusions on further standardization needs are added. 1 Unive...