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Usability  > Definition - 1 of 1

Usability = User-Centered Design = Human-Centered Design

Usability is the extent to which users can access the functionality of a system with effectiveness, efficiency, and satisfaction to achieve specific goals.  Employing user/human-centered design processes helps ensure that products or systems are highly usable and meet users' needs.  These processes emphasize and utilize the user perspective throughout design, development, and test.

  • Effectiveness - the degree to which a system fulfills its intended purpose and supports its users by enabling accurate and complete task performance.
  • Efficiency - the resources expended by a system's users in achieving accurate and complete task performance.

  • User Satisfaction - the user's perceived acceptability of the system.

Image illustrating overlap of Effectiveness, User Satisfaction and Efficiency.



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