# Fitts's Law Test

Small, distant buttons take longer to click on than large, close buttons. This relationship is expressed by Fitts' law:

T = a + b log_{2}(D/W + 1)

Where **T** is time,
**a** and **b** are experimentally determined constants,
**D** is distance to the target and
**W** is the width of the target.

Try it yourself. Choose your input device and click 'Begin'.

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