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Principle 1


An app must be presentable in a way that users can perceive. For example, someone who is blind cannot see the interface. By making it possible to read the interface, the information can be perceived.


  • When an image or graph is not described textually, users with a visual impairment cannot perceive the information.

  • When a video does not have captions, users with a hearing impairment cannot understand the information.

  • When a button has too low contrast, it might not be clear for users that it can be clicked.

  • When a form does not have clear labels, it can be unclear to users where and what information is expected from them.




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