Perceivable, operable, understandable, and robust (POUR) were the 4 overarching design principles clearly delineated in WCAG 2.1 when the final draft was published in 2008.
Perceivable - Information and user interface components must be presentable to users in ways they can perceive. The data presented must be available for access by sight AND through assistive technology like screen readers.
Operable - User interface components and navigation must be operable. At a minimum, the user must be able to navigate through the data presented with a keyboard or assistive technology.
Understandable - Information and the operation of the user interface must be understandable. The data presented must be clear and understandable. Using color only or complex symbols without secondary means of interpretation should be avoided.
Robust - Content must be robust enough to be interpreted by various user agents, including assistive technologies.
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