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Consistency

It is a fundamental principle of an excellent interface, where related elements have a similar look, and operated in the same way throughout the whole interface. Consistency is built up from specified components (usually collected in a design system or Style Guides), so it is fast and easy to construct the interface, based on the principle. Consistency decreases UI learning and enhances user experience.

 

There are four types of consistency:

 

  1. Visual
    When similar elements look the same
  2. Functional
    Similar controls operate in the same familiar way.
  3. Internal
    The combination of visual and functional consistency across the product board
  4. External 
    Consistency goes through the entire product line

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