Web Content Accessibility Guidelines 1.0
From the World Wide Web Consortium. These guidelines are the closest you can get to official usability standards.

Section 508 Checklist
Skip to main content. WebAIM - Web Accessibility in Mind. Begin main menu:. Techniques and Concepts · Coordination and Leadership · Products and Tools

Architectural BarriersTexas Accessibility Standards (TAS)
This is the Texas Accessibility Standards (TAS) page for the Architectural Barriers program administered by the Texas Department of Licensing and

Section 508: The Road to Accessibility
Official website for Section 508 of the US Rehabilitation Act.