Web Content Accessibility Guidelines 2.0 (WCAG 2.0) require that success criteria be tested by human inspection. Further, testability of WCAG 2.0 criteria is achieved if 80% of knowledgeable inspectors agree that the criteria has been met or not. In this paper we investigate the very core WCAG 2.0, being their ability to determine web content accessibility conformance. We conducted an empirical study to ascertain the testability of WCAG 2.0 success criteria when experts and non-experts evaluated four relatively complex web pages; and the differences between the two. Further, we discuss the validity of the evaluations generated by these inspectors and look at the differences in validity due to expertise.
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Brajnik et al. (2010) studied this question.
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