Unified Web Evaluation Methodology

A standardized methodology developed by the European Web Accessibility Benchmarking Cluster (WAB Cluster) for evaluating the accessibility of websites in a consistent, comparable way. UWEM provides formulas for calculating quantitative accessibility scores from WCAG checkpoint violations, considering factors such as the number of potential versus actual barriers and their severity based on WCAG priority levels. The methodology has gone through several versions (0.5 and 1.0) and serves as a baseline for comparing accessibility across websites and tracking improvements over time. UWEM was influential in establishing that web accessibility could be measured quantitatively rather than assessed only as pass/fail conformance, enabling large-scale benchmarking studies across organizations and countries.