**Hick-Hyman law**, is a human-computer interaction model that describes the time it takes for a user to make a decision as a function of the possible choices he or she has. Given

*n*equally probable choices, the average reaction time

*T*required to choose among them is approximately

*T*=*b*log_{2}(*n*+ 1)

*b*is a constant that can be determined empirically by fitting a line to measured data.

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