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Information and the operation of user interface must be understandable.
The Understandable principle ensures that information and the operation of the user interface are clear and comprehensible. This means that users must be able to understand both the information presented and how to operate the interface. Content should be readable and predictable, and users should receive help when they make errors.
If users cannot understand the content or how to use the interface, they cannot effectively use the website or application. This principle addresses the needs of users with cognitive disabilities, learning disabilities, language barriers, and those who are new to technology. Complex language, unpredictable navigation, and unclear error messages create significant barriers.
Impact: Cognitive disabilities affect millions of people worldwide. Additionally, many users are not native speakers of the content's language. Making content understandable benefits everyone, including users with cognitive disabilities, learning disabilities, and those with limited literacy or technical knowledge.
Using clear, simple language appropriate for the audience
Maintaining consistent navigation and layout patterns
Providing clear error messages that explain what went wrong and how to fix it
Identifying the language of content (e.g., lang='en' attribute)
Avoiding jargon and technical terms without explanation
Providing context-sensitive help and instructions