Chapter 2

The Human Factor

The deepest challenges in human-computer interaction (HCI) lie in the human factor. Humans are complicated. Computers, by comparison, are simple. Computers are designed and built and they function in rather strict terms according to their programmed capabilities. There is no parallel with humans. Human scientists (including those in HCI) confront something computer scientists rarely think about: variability. Humans differ. We’re young, old, female, male, experts, novices, left-handed, right-handed, English-speaking, Chinese-speaking, from the north, from the south, tall, short, strong, weak, fast, slow, able-bodied, disabled, sighted, blind, motivated, lazy, creative, bland, tired, alert, and on and on. The variability ...

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