The story
Initially developed by Paul Fitts.
Etymology from Wiktionary, CC BY-SA 4.0.
Fitts's law
Today it means: A predictive model of human movement primarily used in human-computer interaction and ergonomics, stating that the time required to move rapidly to a target area (for example, using a computer mouse) is a function of the ratio between the distance to the target and the width of the target. Full definition →