![]() Similarly, it takes longer to hit targets which are further away and smaller. As powerful transmitters carry more information, it becomes harder to receive when the allowable noise level increases. Fitts claimed that the distance (A) can be thought as signal power, the width of the target (W) can be thought as the allowable noise. In the above equation, C represents the effective information capacity of the communication channel, B represents the bandwidth of the channel, S and N represent signal and allowable noise power levels respectively. ![]() The movement distance from the starting position to the target centerįitts started his work making an analogy of the human motor system to the well-known Shannon's channel capacity theorem. In the Fitts’ Law description of pointing, the parameters of interest are:ī. Paul Fitts extended Woodworth's research which focused on telegraph operator performance substantially with his famous reciprocal tapping task to define the well-referenced Fitts’ Law (Fitts 1954). They were not targeted to HCI field because there was no GUI. The early experiments on pointing movements targeted the tasks that might be related to the worker efficiency problem, such as production line and assembly tasks. ![]() Today, with the advent of graphical user interfaces and different styles of interaction, Fitts’ Law seems to have more importance than ever before. Fitts's Law is basically an empirical model explaining speed-accuracy tradeoff characteristics of human muscle movement with some analogy to Shannon’s channel capacity theorem. The name of the famous researcher is Paul Fitts, so one should be careful on spelling.
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