How fast can I type on my computer? Or what is my accuracy pointing to the screen? and most important....why should I care about that? This is the main goal of Human-Computer interaction (HCI): to improve the interaction between users and computers by making computer interaction mechanisms adapt to the users and the tasks instead of the other way around. Over the long-term, HCI aims to design systems that minimize the barrier between an human's cognitive model of what he/she wants to accomplish and the computer's understanding of the user's task, as well as helping solve real problems...

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