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Usability engineering is a profession and area of study that is primarily based on psychology.
Just as you have computer specialists who need to know the architecture of a computer system, a human-factors engineer has to understand learning theory, biomechanics, kinesiology and how people interact with objects. It involves systematically engineering human factors into the design of things. It started in World War II with aircraft cockpits, and now there is a specific area of the field that applies to software and the Internet. First of all, you have to understand the business direction and strategy of the company and its products. Then you do contextual inquiry, where you try to understand a whole set of things about the Web-site user, their task flow and environment they are working in.