Cognitive Web Accessibility: Assessments
This is a description of the criteria and the methodology I use to assess the efforts of 100 cognitive disability organizations to make their Web sites accessible to their constituencies. For more information, see the archive of related blog posts.
- 20 of 100 Web sites have been assessed to date. The average score is 5.
- Index Of All Results
- Results By Numbers Of Web Sites That Met Section Criteria
- Summary Results By Web Site
- Detailed Results By Web Site
Seven criteria are based upon WebAIM's latest Cognitive Web Accessibility Checklist:
- Multi-Modality (e.g., video- or audio alternatives to text);
- Focus and Structure (use of elements to focus attention, not distract it, etc.);
- Readability and Language (clear display of text and use of simple language);
- Consistency (of navigation);
- Transformability (support for increased text- and image sizes, etc.);
- Orientation and Error Prevention/Recovery (adequate instructions, feedback and error recovery)
- Assistive Technology Compatibility (use of alternative text, labels, headings, keyboard accessibility, etc.)
Three criteria help evaluate general Web site accessibility.
- Attempt to meet W3C accessibility standards (1.0 or 2.0).
I judge this based upon a related site statement or by a positive result from running WebAIM's WAVE against up to three pages.
- Accessibility statement.
- Explanation about how to use site accessibility feature(s).
On at least three pages per Web site, I look for the presence or the absence of features that meet the guidelines listed for each of the checklist's sections. I average the number of guidelines that were met (successes) with those that were not (failures). For an average success of 75% or higher, I record one point. Up to seven such checklist points could be recorded.
I record one point each for the presence of the remaining three design-related criteria.
To be judged accessible, a Web site must minimally meet all (4) design criteria and all (3) content criteria based upon WebAIM's checklist. Up to 3 points for design-related criteria add to the total score.
Web Sites Chosen For Assessments
The Web sites I assess are from my list of over 100 cognitive disability organizations.
- National Organizations
- International Organizations
- Organizations For People with Intellectual Disabilities
- WebAIM's latest Cognitive Web Accessibility Checklist with instructions on how to use WAVE to test a Web site's implementation of the checklist's guidelines;
- WebAIM's WAVE accessibility evaluation toolbar;
- Standards Schmandards Readability Index Calculator;
- Jonathan Snook's Colour Contrast Check;
- Firefox 3.6x;
- Internet Explorer 8.x
- On , I changed the accessibility-success criteria. A site is now judged accessible if it meets all (4) design criteria and all (3) content criteria based upon WebAIM's checklist. Previously, a site was judged accessible if it achieved a score of 7 or greater (which included design-related criteria).
- On , I changed the success criterion for the average number of guidelines met from 80% to 75%.
- I do not evaluate content contained within PDF files linked from Web sites.
- The designations (above) of "Content" and "Design" are my own, not those of WebAIM.
Visit The Clear Helper Blog: Developing best practices of Web accessibility for people with intellectual / cognitive disabilities.