... a mouse, and some are not that successful. According to Jenny Preece (1994), the goals of Human-Computer Interaction are to produce a usable and safe system, as well as functional system. Preece (1994) has also argued that these goals can be summarized as 'to develop or improve the safety, utility, effectiveness, efficiency, and usability of system that include computers' Booth (1989) has argued that the usability of Human-Computer Interaction to be good, the system must be effectiveness, learnability, flexibility and user attitude. Effectiveness -user must be able to use the system within a certain time. Learnability - the user must be able to learn to learn the system in certain amount of training. Flexibility - allowing adaptation to some specified percentage in task/environment. Attitude - the system must be able to accept the level in human cost in terms of tiredness, discomfort, frustration, and personal effort. The importance of Human-Computer Interaction can be shown by the benefits ...

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