ユーザビリティーはアクセシビリティーがあって初めて成り立つという主張。
DigitalGov: User Experience Impossible: The Line Between Accessibility and Usability
Accessibility is a benchmark of the quality of our users’ experiences. The two are quite different by definition, but in practice, they’re still separate issues. Accessibility means that your audience can get to the content and message you want them to receive. It’s more than just user experience. Without accessibility, the user experience—good or bad—can’t even happen. So, as the saying goes, “usability depends on accessibility.”