How do we overlap?

Accessibility is often usability

Many cognitive issues are usability issues.
Many color issues are usability issues.

Usability often helps ensure accessibility

Many mobile issues are accessibility issues.
One user's inconvenience is another's barrier.

BUT: usability for one user group may be inaccessibility for another group.

Accessibility prioritizes usability issues for users with disabilities.

users' with various disabilities, various devices