5. Understandable
Maintain the interface so that it remains intuitive and predictable, enabling all users to navigate digital content more effectively.
This principle emphasises the need for clear language and consistent design.
Example: Consistent navigation
Maintaining consistent navigation in digital content helps users understand how to use the application and what to expect as they interact with different parts of the website or application.
For example, a digital banking application may have a specific interface on the home screen for navigating between accounts. This structure should remain consistent across both mobile and desktop versions. Consistency in interface design helps users with cognitive disabilities understand the functionality more quickly and reduces confusion for all users.

Figure 31. Example of poor design – components serve the same purpose but are not labelled consistently.
(Source)

Figure 32. Example of good design – components serve the same purpose and are labelled consistently.
(Source)
Background Colour
Font Face
Font Size
Text Colour
Font Kerning
Image Visibility
Letter Spacing
Line Height
Link Highlight