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Usability

Degree to which a product or system can be used by specified users to achieve specified goals with effectiveness, efficiency and satisfaction in a specified context of use. This characteristic is composed of the following subcharacteristics:

  • Appropriateness recognizability. Degree to which users can recognize whether a product or system is appropriate for their needs.
  • Learnability. degree to which a product or system can be used by specified users to achieve specified goals of learning to use the product or system with effectiveness, efficiency, freedom from risk and satisfaction in a specified context of use.
  • Operability. Degree to which a product or system has attributes that make it easy to operate and control.
  • User error protection. Degree to which a system protects users against making errors.
  • User interface aesthetics. Degree to which a user interface enables pleasing and satisfying interaction for the user.
  • Accessibility. Degree to which a product or system can be used by people with the widest range of characteristics and capabilities to achieve a specified goal in a specified context of use.

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