# Fitts' Law

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Fitts' Law is a rule of psychomotor function which states that the time required to move to a target is a function of the size of the target and the distance to it. It is formally stated as ${\displaystyle MT=a+b\log _{2}({\frac {2A}{W}})}$, where MT is the movement time, a and b are regression coefficients, A is the distance to move to the center of the target, and W is the width of the target. The law is named for Paul Fitts, who first stated it in 1954.