1) The document proposes a methodology for quantitatively evaluating web accessibility with respect to disabled users, especially the vision-impaired and hearing-impaired. 2) It describes existing approaches to quantitative evaluation and their limitations in indicating accessibility for specific disabled groups. 3) The proposed approach uses barrier walkthroughs to identify barriers and relates them to specific checkpoints, then calculates a severity value based on the checkpoints to provide a single value representing accessibility for a specific disabled group.

1. Quantitative Evaluation for Web Accessibility with Respect to Disabled Groups

11. An Improved Approach (4) where is number of potential barrier types on a web page is number of actual barriers for barrier type i is number of potential barriers for barrier type i is number of checkpoints related to priority level p and barrier type i.

14. Model Evaluation Comparison of values from T1 and A3 from all data