 - Also see human-computer interaction and graphical user interface.
Usability is the measure of a product's potential to accomplish the
goals of the user. In information technology, the term is often used in relation to software applications and Web sites, but it can be used in relation to any
product that is employed to accomplish a task (for example, a toaster, a car
dashboard, or an alarm clock). Some factors used in determining product usability
are ease-of-use, visual consistency, and a clear, defined
process for evolution.
Usability testing is a method by which users of a product are asked to
perform certain tasks in an effort to measure the product's
ease-of-use, task time, and the user's perception of the experience. Usability testing can be done formally, in a usability
lab with video cameras, or informally, with paper mock-ups of an
application or Web site. Changes are made to the application or site
based on the findings of the usability tests. Whether the test is
formal or informal, usability test participants are encouraged to
think aloud and voice their every opinion. Usability testing is best
used in conjunction with user-centered design, a method by which a
product is designed according to the needs and specifications of
users.
Within the last several years, the usability of Web sites has become a
hot topic for Web developers. Many major Web sites
employ usability engineers to ensure that they have an easy-to-use,
friendly site that provides a positive customer experience. Major
sites such as Drugstore.com and Altavista.com have recently been
re-designed based on recommendations made during usability tests and
evaluations.
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24 Mar 2003
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