On the testability of WCAG 2.0 for beginners

Web accessibility for people with disabilities is a highly visible area of research in the field of ICT accessibility, including many policy activities across many countries. The commonly accepted guidelines for web accessibility (WCAG 1.0) were published in 1999 and have been extensively used by designers, evaluators and legislators. W3C-WAI published a new version of these guidelines (WCAG 2.0) in December 2008. One of the main goals of WCAG 2.0 was testability, that is, WCAG 2.0 should be either machine testable or reliably human testable. In this paper we present an educational experiment performed during an intensive web accessibility course. The goal of the experiment was to assess the testability of the 25 level-A success criteria of WCAG 2.0 by beginners. To do this, the students had to manually evaluate the accessibility of the same web page. The result was that only eight success criteria could be considered to be reliably human testable when evaluators were beginners. We also compare our experiment with a similar study published recently. Our work is not a conclusive experiment, but it does suggest some parts of WCAG 2.0 to which special attention should be paid when training accessibility evaluator

Evaluating Conformance to WCAG 2.0: Open Challenges

Web accessibility for people with disabilities is a highly visible area of work in the field of ICT accessibility, including many policy activities in several countries. The commonly accepted guidelines for web accessibility (WCAG 1.0) were published in 1999 and have been extensively used by designers, evaluators and legislators. A new version of these guidelines (WCAG 2.0) was published in 2008. In this paper we point out the main challenges that WCAG 2.0 raises for web accessibility evaluators: the concept of "accessibility supported technologies"; success criteria testability; technique and failure openness, and the aggregation of partial results. We conclude the paper with some recommendations for the future

Measuring and comparing the reliability of the structured walkthrough evaluation method with novices and experts

Effective evaluation of websites for accessibility remains problematic. Automated evaluation tools still require a significant manual element. There is also a significant expertise and evaluator effect. The Structured Walkthrough method is the translation of a manual, expert accessibility evaluation process adapted for use by novices. The method is embedded in the Accessibility Evaluation Assistant (AEA), a web accessibility knowledge management tool. Previous trials examined the pedagogical potential of the tool when incorporated into an undergraduate computing curriculum. The results of the evaluations carried out by novices yielded promising, consistent levels of validity and reliability. This paper presents the results of an empirical study that compares the reliability of accessibility evaluations produced by two groups (novices and experts). The main results of this study indicate that overall reliability of expert evaluations was 76% compared to 65% for evaluations produced by novices. The potential of the Structured Walkthrough method as a useful and viable tool for expert evaluators is also examined. Copyright 2014 ACM

Using collaborative learning to teach WCAG 2.0

La versión 2.0 de las Directrices de Accesibilidad para el Contenido Web (WCAG) se publicó en diciembre de 2008. WCAG 2.0 tiene un idioma diferente, una estructura diferente y una lógica diferente a las WCAG 1.0. Todos estos influyen en la forma de enseñar a la accesibilidad web. En este artículo se presenta un enfoque innovador que se ha seguido en un módulo de accesibilidad web que se imparte en la Escuela de Informática de la UPM en el marco de la licenciatura en Ciencias de la Computación Beng. Nuestro enfoque combina varios métodos de enseñanza: las clases magistrales, sesiones de aprendizaje colaborativo, un breve ejercicio de evaluación de sitios web y, por último, un proyecto a corto que consiste en el desarrollo de un sitio web accesible. En el trabajo se describen los métodos utilizados y los resultados

Developing Hera-FFX for WCAG 2.0

WCAG 2.0 was published in December 2008. It has many differences to WCAG 1.0 as to rationale, structure and content. Two years later there are still few tools supporting WCAG 2.0, and none of them fully mirrors the WCAG 2.0 approach organized around principles, guidelines, success criteria, situations and techniques. This paper describes the on-going development of an update to the Hera-FFX Firefox extension to support WCAG 2.0. The description is focused on the challenges that we have found and our resulting decisions

Toward an integration of Web accessibility into testing processes

Proceedings of: 5th International Conference on Software Development and Technologies for Enhancing Accessibility and Fighting Info-exclusion, DSAI 2013. Took place in November 13-15, 2013, in Vigo, Spain. The event web site is http://dsai2013.utad.pt/The goal of this paper is to review the literature in order to understand the implications of accessibility testing processes with the objective to detect potential improvements and developments in the field. Thus, a brief review is presented of the fundamental test processes proposed by the International Software Testing Qualification Board (ISTQB) and the currently available literature about testing processes for evaluating the accessibility of web applications. The result of the review reflects an array of proposals to incorporate accessibility requirements and evaluation tools, but they do not describe a comprehensive testing process at each phase of the development lifecycle of accessible web applications.This research work is supported by the Research Network MAVIR (S2009/TIC-1542) and MULTIMEDICA project (TIN2010-20644-C03-01).Publicad

Understanding and supporting web developers: : design and evaluation of a web accessibility information resource (WebAIR)

This paper describes the design and evaluation of a Web Accessibility Information Resource (WebAIR) for supporting web developers to create and evaluate accessible websites. WebAIR was designed with web developers in mind, recognising their current working practices and acknowledging their existing understanding of web accessibility. We conducted an evaluation with 32 professional web developers in which they used either WebAIR or an existing accessibility information resource, the Web Content Accessibility Guidelines, to identify accessibility problems. The findings indicate that several design decisions made in relation to the language, organisation, and volume of WebAIR were effective in supporting web developers to undertake web accessibility evaluations

An Interactive Color Picker that Ensures WCAG2.0 Compliant Color Contrast Levels

AbstractInsufficient contrast between text and the background is a common problem on the web. WCAG2.0 addresses this problem, but the definition is hard to understand for most designers. Therefore, some web designers check their designs with contrast checking tools after the design is finished. If the design does not meet the WCAG2.0 guidelines the designer will have to go back and make adjustments. To overcome this problem a color picker tool is proposed that allows designers to select WCAG2.0 compliant colors during the design process thus eliminating the need for post-design color adjustments. First, the designer selects the first color freely from all available colors. Subsequently, only colors are presented that meets the chosen contrast level. In addition to being a design tool, it also serves as a pedagogical visualization aid that can help students and designers better understand the complex relationships between colors palettes and their contrasts

Quantitative metric for ranking web accessibility barriers based on their severity

Web accessibility aims at providing disabled users with a barrier free user experience so they can use and contribute to the Web more effectively. However, not all websites comply with WCAG 2.0 which results in Web accessibility barriers in websites. Thus, assistive technologies such as screen readers would not be able to interpret the presented contents on the monitor due to these barriers and this will contribute to making websites inaccessible to disabled users.This paper proposed an innovative metric that assigns measurable weight to each identified barrier based on its severity and impacts on the accessibility level, and then ranks the barriers accordingly. Following, Web developers can fix the highly ranked severe barriers instead of wasting time in studying and fixing less severe types of barriers that may rarely occur.An experiment was conducted to check the metric validity.We found the metric was valid and thereby we suggested the usage of the metric as a valid scientific measurement

Accessibility of Thai university websites: Awareness, barriers and drivers for accessible practice

Governments and organizations have to respond to a range of legislative and policy initiatives intended to promote equal opportunity for all. The Thai government has passed a number of laws which aim to protect its citizens from discrimination and from breaches of their human rights by government departments and agencies. The Persons with Disabilities Education Act B.E. 2551 (2008) and the Thailand Information and Communication Technology (ICT) Policy Framework (2011-2020) required government agencies to delivery equal education and access to online information for all Thais. Most Thai universities receive government subsidies, and therefore have an obligation to contribute to national prosperity so that all Thais can benefit from their activities, or as the Ministry of Information and Communication Technology and The National Electronics and Computer Technology Centre (2011, p. 23) states “The creation of content, database, online content which promotes lifelong learning, the development of school websites and other digital content should follow the web accessibility standard”. Given the Thai government’s commitment to lifelong learning and the creation of accessible materials, this thesis sought to investigate to what level Thai universities were implementing web accessibility in their websites and e-learning materials. A mixed method approach was employed in order to explore the level of accessibility awareness, barriers to web accessibility implementation and possible drivers for accessibility uptake which might exist within Thai universities. Quantitative data derived from automated and manual web evaluations was gathered based on WCAG 2.0 guideline in order to determine the actual levels of accessible design apparent in Thai university websites. Fifty representative universities were selected from the top ranked Thai universities and a number webpages were tested from within each of the university websites. In addition, online surveys were conducted with three stakeholder groups within the Thai university sector, namely lecturers, web staff and senior managers. These surveys were design to set the context for quantitative website assessment findings and provide evidence as to these stakeholders understanding of web accessibility as a concept. Finally, follow-up interviews were conducted after the web assessments and surveys were analysed so as to reduce ambiguity and increase understanding, creating a very clear picture of the standing of web accessibility in Thailand’s universities. The findings of the data analysis indicate that Thai universities have low levels of web accessibility implementation in their websites and e-learning materials, even though web accessibility requirements had been embedded in Thai laws and policies for over a decade. In terms of web evaluation, the university webpages had accessibility problems across all aspects of WCAG 2.0’s POUR principles, with not a single tested webpage passing even the lowest level of WCAG 2.0 compliance. The survey and interview data revealed very low levels of awareness of web accessibility amongst Thai university staff members as well as lack of knowledge regarding students with disabilities and their specialised technology needs. Whilst Thai university staff were generally supportive of the concept of web accessibility and supporting students with special needs, this was accompanied by some less supportive views, including students with disabilities being taught only in specialised educational facilities or only where there were sufficient numbers of such students to make the investment in accessibility worthwhile. A number of universities in this study featured university admission requirements which could be classed as a discriminatory and not aligned with the requirements of the Thai government. In fact, this thesis revealed an almost total lack of awareness within the Thai university sector of Thai government policy regarding web accessibility and equality in education. This thesis proposed a Smart Thailand : Accessible Learning model and an associated implementation framework which together might lead to an environment in which Thai universities would be more willing and able to implement the tenets of web accessibility and provide an equitable learning experience for all Thai citizens, especially those with disabilities