An Integrative Accessibility Engineering Approach Using Multidimensional Classifications of Barriers in the Web
Diana Ruth-Janneck · 2011 · Proceedings of the International Cross-Disciplinary Conference on Web Accessibility (W4A) · doi:10.1145/1969289.1969303
Summary
This paper presents multidimensional classifications of web accessibility barriers derived from the large-scale German study "Web2.0/Accessible," commissioned by Aktion Mensch, which surveyed 671 disabled internet users via an accessible online questionnaire (with audio files and sign language videos) supplemented by expert consultations and group interviews with advanced disabled web users. The study covered visual impairment (133), blindness (124), hearing impairment (96), deafness (260), motor/dexterity impairments (75), and learning disabilities/cognitive impairments (89). The author organizes barriers along three dimensions: disability type (grouped by similar AT usage patterns), application class (form-based, extended form/editor-based, media-rich), and barrier type (technical, editorial/content-related, design, organizational). Each barrier type maps to a responsible stakeholder: technical barriers to web programmers and AT vendors, editorial barriers to content editors, design barriers to web designers, and organizational barriers to decision-makers and clients. The classifications are presented as cross-reference matrices enabling any stakeholder to identify which barriers affect which users in which application types.
Key findings
The study revealed strikingly different barrier profiles across disability groups. Visually impaired and blind users primarily encounter technical barriers — CAPTCHAs, inoperable forms and editors, JavaScript/Flash/AJAX incompatibility with AT, and inability to operate without a mouse. Hearing impaired and deaf users primarily face editorial and organizational barriers — difficult language and foreign words (especially in explanations, links, and error messages), missing sign language videos and subtitles, and poor media quality. This is compounded by the fundamental linguistic barrier: German Sign Language differs substantially from written German, so deaf users experience written content as a second language. Users with cognitive impairments face primarily editorial barriers around understandability, orientation, and clear arrangement. Motor impaired users face technical barriers around operability — web forms, buttons, drop-down menus, and link activation without a mouse. Across all disability groups, the three most critical universal barriers were: understandability (in the broadest sense), use of forms, and operability of multimedia components with AT. The author proposes integrating these classifications into Mayhew's usability engineering lifecycle as an "integrative accessibility engineering" approach — using the barrier matrices during requirements analysis, design review, and evaluation phases.
Relevance
This paper provides one of the most comprehensive empirical pictures of how different disability groups experience Web 2.0 barriers, based on a sample size (671) large enough for statistically meaningful conclusions. The four-type barrier classification (technical, editorial, design, organizational) is particularly valuable because it maps directly to accountability — telling organizations not just what's wrong but who is responsible for fixing it. The finding that deaf users face primarily editorial and organizational barriers rather than technical ones challenges the common assumption that accessibility is mainly a developer problem; for deaf users, the barriers are about content quality, language complexity, and organizational willingness to invest in sign language and subtitles. The integrative accessibility engineering approach — embedding barrier awareness into every phase of the usability engineering lifecycle rather than treating accessibility as a final-stage audit — remains best practice advice that most organizations still fail to follow. The study's limitation is its German-specific context, though the barrier dimensions and classifications are broadly generalizable.
Tags: accessibility barriers · accessibility evaluation · user research · web accessibility · software engineering · organizational accessibility · cognitive accessibility · deaf accessibility
Standards referenced: WCAG · UAAG · ATAG