ABSTRACT
Usability has been the focus of attention of human factors specialists, cognitive psychologists, interface designers, and, of course, usability engineers for more than 30 years. At first, the concept was not clearly defined and was regarded as the same as the ease of use or usefulness. Until the 1980s, the approach from the cognitive psychology was rare and most studies on usability were conducted in the context of human factors engineering, and were focused on adaptability to physical characteristics, ease of operation, speed of operation, minimization of human error, fatigue, ease of perception, and so on.
