DrDoc - 1:29 am on Feb 24, 2006 (gmt 0)

You won't be able to move to Priority 2 Checkpoints without validating to a DTD.

But passing the Priority 1 checkpoints still means that you can call your site accessible.

Validation - Accessibility - Usability What comes first? What comes last?

Accessibility comes first. If no one can access it, who cares if it validates or is usable. ;)