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Understanding Levels of Conformance

with a high level of confidence. -

The success criteria were assigned to one of the three levels of conformance by the - working group after taking into consideration a wide range of interacting issues. +

The success criteria were assigned to one of the three levels of conformance + – Level A, Level AA, Level AAA – + by the working group, after taking into consideration a wide range of interacting issues. Some of the common factors evaluated when setting the level included:

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As an example, criteria that address problems that can't be remediated by assistive technology or worked around through other means, can be satisfied for + all types of content, don't require specialized skills to author accessibly, and whose implementation would not require fundamental changes to functionality + or visual design, would likely be categorized under Level A; conversely, criteria that can't be satisfied for all websites/types of content, + that may require a certain amount of (sometimes subjective) interpretation to determine a pass/fail, and would require extensive changes to functionality or visual design, would likely fall under Level AAA. +

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While WCAG 1.0 categorized checkpoints into priority levels, which were then mapped + to WCAG 1.0's Level A, Level AA, and Level AAA conformance levels, + WCAG 2 (which reworked how criteria were assigned to levels) does not suggest any particular level of priority or severity. Every criterion is important to one or more user groups. In most cases, there is no intrinsic severity associated with failing a particular criterion – this also depends on other aspects, such as the frequency of the failure, and the type of content or functionality that is failing.

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How to prioritize criteria during development or remediation is a question for development teams, which will factor in further aspects such as their resources, + development cycles, or their own assessment of how severe or widespread a particular problem is in their content. The choice of which specific level to aim + for conformance with – just Level A, both Level A and AA, full Level A/AA/AAA – is fundamentally a policy decision. +

Understanding Accessibility Support