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Human - Computer Interaction The term "Human-Computer Interaction (HCL)" is commonly changing to terms such as "Man-Machine Interaction (MMI)", "Computer and Human Interaction (CHI)" and "Human-Machine interaction (HMI)". Human-Computer Interaction is defined in many ways but Booth (1989) defines Human-Computer Interaction as "it is the study of the interaction between humans and computers". Human-computer interaction is concerned with how current input and output technologies affect interaction and in what situation these technologies and techniques might be put to best use. The common input devices include alphanumeric keyboards, cursor keys, mice, tracker balls, joysticks, graphics tablets, light pens and touch screen. Less common forms of input include moles or foot mice and even devices that detect eye movement. Human-computer interaction is also concerned with hardware and software, to some this might be the most important in Human-Computer Interaction development. The number of input devices is continuing to expand, and many of the new devices are finding...

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