The POUR principle is a fantastic way to frame the design of your content and help guide your design and development towards creating accessible content. Simply put it means:

Perceivable: Your content and user interface need to be presented in a way users can perceive. In a nutshell, this means that users must be able to understand the information being presented. However, you can't rely on all senses, e.g., you can't rely on solely a visual perception.

Operable: All aspect of your content and navigation through it must be operable. In short, no matter how the learner is accessing your content, there can't be elements that they will not be able to interact with.

Understandable: Your content and how to access/use the content must be understandable. This means that users must be able to comprehend the content as well as how to interact with it. Again, without relying on a single sense.

Robust: This is where the content must be design to be reliably interpretable by a wide variety of web readers (user agents), including assistive technologies. Of course as technology evolves your content and the assistive technologies need to evolve as well. This is where the standards come into play as a "rulebook" for all the content and technologies to follow. 

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