WCAG Principles

WCAG 2.0 is a set of guidelines created by the W3C-WAI working group. They have created a set of rules to assist web developers, designers, and content authors create accessible websites. The guidelines are grouped into 4 main categories, known as Principles. They are as follows:

1. Perceivable
2. Operable
3. Understandable
4. Robust

Principle #1: Perceivable 

http://www.w3.org/TR/WCAG20/#perceivable

Principle #2: Operable 

http://www.w3.org/TR/WCAG20/#operable 

Principle #3: Understandable

http://www.w3.org/TR/WCAG20/#understandable 

Principle #4: Robust

http://www.w3.org/TR/WCAG20/#robust