, faster performance on tasks, lower rate of errors and higher subjective satisfaction. Knowledgeable managers are recognizing that excellent user interfaces produce dramatic marketing advantages because they can greatly increase productivity, substantially reduce fatigue and errors, and enable users to be more creative in solving problems.
             It is only recently, that our way of thinking towards the Human Computer Interaction has been changed, One of the reason is the increasing affordability of richer visual and auditory displays, and the computing power to support them and thus, potentially, of more nuance represe
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