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Web Site Usability

Web site usability is defined as "the extent to which a site can be used by a specified group of users to achieve specified goals with effectiveness, efficiency, and satisfaction in a specified context of use". This definition implies that usability is user and task dependent, as well as being related to how well the user is able to accomplish what they set out to do, how efficiently the user can do this, and how satisfied the user is during and after the process.

Usability is also defined as a quality attribute that assesses how easy user interfaces are to use and may refer to methods for improving ease-of-use during the design process. Five quality components are suggested for determining the usability of a web site: