Minimum standard. Without achieving "A" standard, it is assumed that there could be a group of people who might not be able to browse the website comfortably.
The desirable standard. If "AA" standard is achieved, there will be less cases of difficulty in browsing websites.
Advanced criteria. A website would be the most accessible to browse if "AAA" standard is achieved.
Design That Solves (I'm in Trouble!)
The National Art Center, Tokyo
Levels of conformanceAA
Book "Web Application Accessibility" Support Site
Fukuoka International Airport
The National Museum of Western Art
Denkikanagawa Center for Community Welfare
Mitsubishi Chemical Group Corporation