Literature Reviews

Reviewed research papers, articles, and publications relevant to digital accessibility.

• OPTIMAL-EM: Complexity-Driven Clustering for Optimised Web Accessibility Evaluation

  Alexander Hambley, Yeliz Yesilada, Markel Vigo, Simon Harper (2026) — ACM Transactions on the Web, Vol. 20, No. 2

  Hambley, Yesilada, Vigo, and Harper (University of Manchester and METU-NCC) extend their OPTIMAL-EM methodology for large-scale web accessibility conformance evaluation. The problem they address is fundamental to professional auditing: the W3C's Webs…

  • web accessibility
  • accessibility evaluation
  • WCAG-EM
  • OPTIMAL-EM
  • representative sampling
  • web page complexity
  • clustering
  • DBSCAN
  • t-SNE
  • machine learning
  • audit methodology
  • automated testing

• Optimising the Website Accessibility Conformance Evaluation Methodology

  Alexander Hambley, Yeliz Yesilada, Markel Vigo, Simon Harper (2022) — Proceedings of the 19th International Web for All Conference (W4A)

  This paper critically examines the Website Accessibility Conformance Evaluation Methodology (WCAG-EM), the W3C's standard five-step process for evaluating website conformance to WCAG. The authors identify several methodological weaknesses in WCAG-EM …

  • accessibility evaluation
  • WCAG-EM
  • sampling methodology
  • automated testing
  • web crawling
  • conformance evaluation
  • accessibility audit
  • statistical methods