Usability testing involves representative users attempting representative tasks in representative environments, on early prototypes or working versions of computer interfaces. The world of usability testing includes testing prototypes that have only been built on paper (known as paper prototypes); mock-ups or wireframes which have no functionality, screen layouts which have partial functionality, working versions of software before they are officially released, and testing software that has already been implemented and is in use. All of these approaches to usability testing have one basic goal: to improve the quality of an interface by finding flaws, which are areas of the interface that need improvement. ...
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