Fitts' law

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Fitts' law

"The time required to reach a target is based on the distance from the starting point and the size of the target." Coined by Paul Fitts in the 1950s, the law is applied to the location and size of menus and buttons in software. For example, a large button is faster to reach than a small one, and the edges of the screen provide natural stops. Many users prefer the Mac's user interface, because all menus display at the top of the screen. Others prefer Windows, because many commonly used buttons can be made much larger. See laws.
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The "atomic" interactions among all of the keys drove the movement efficiency - defined by the summation of all Fitts's law movement times between every pair of keys, weighted by the statistical frequency of the corresponding pair of letters in English - toward the minimum.
For example, in an excellent tutorial entitled "The Pragmatics of Haptic Input," Bill Buxton used a Macintosh to illustrate Fitts's Law.
It says that Fitts's law (Fitts, 1954) - a formula relating movement time to movement amplitude and target width - reflects an optimization strategy.