What is accessibility?

On this page, from the National Center on Accessible Educational Materials at CAST, instructors will find a concise definition of accessibility that can be referenced in syllabi and other documents to ensure a common language is used to avoid confusion. Related terms such as assistive and accessible technology are also defined. This webpage also includes a short video about understanding accessibility.


Accessibility Feature
Accessibility Hazard
Accessibility Control
Access Mode
Access Mode Sufficient


Date Of Record Release
December 7th, 2021 at 1:59pm (W3C-DTF)
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