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What is Usability?

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Usability is the value of a user interface to users. This value is driven by functionality and the efficiency with which users can accomplish their goals. Interfaces that are pleasing to use as opposed to stressful or boring are also of higher value to users.
Overview: Usability Definition
Type
Definition (1)
The value of a user interface to users.
Definition (2)
A user interface that offers efficient controls and valuable functionality that is pleasant to use.
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