Accessibility & Usability?

What is the difference between accessibility and usability? These two notions seem to have nothing in common, however, everyone seems to mix them.

I’m thinking more and more of having one part of my work centered on accessibility issues for Flash, and another one on usability issues. Accessibility issues seem obvious for Flash (because the data is compiled, you can’t access it through usual screen readers, etc.) but usability issues exist as well and can be categorized in a different category. Loading animations are an example of a usability subject, it has nothing to do with accessibility.

I’ve just bought a book about Flash usability problems and solutions. We’ll see what they say!

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