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Fitts' Law
What is it?
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The bigger an object and the closer it is to us, the easier and faster it is to move.
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Discovered by Paul Fitts.
A
Target (B)
D
W
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Fitts’ observation that the action of pointing to or tapping a target object could be measured and predicted mathematically.
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It states that the time to acquire a target is a function of the distance to and size of the target.
Coeffiecients
Distance
T = a + b log ( 1 + )
2
DW
__
Time takes you from your location to target location
Width of target
Use of Fitts's Law
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Break paddle is bigger than accelerator paddle.
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The START button is small in heavy machine & STOP is bigger.
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Fitts’ law is widely applied in user experience (UX) and user interface (UI) design.
Fitts' Law
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Computer hotkeys over a mouse.
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TV Remote over TV buttons.
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