"The speed–accuracy trade-off was given a precise mathematical formulation by Paul Fitts in 1954, Fitts' law." #readingToday

The speed–accuracy trade-off was given a precise mathematical formulation by Paul Fitts in 1954, and thence became known as Fitts' law. The law predicts the time required for a rapid, aimed movement of, say, a lever or a computer mouse, from a starting position to a final target area. The time is a function of the distance to the target and the size of the target. Fitts' law is an effective method of modelling rapid, aimed movements, where, e.g., a hand starts at rest at a specific start position and moves to rest within a target area. It can be used to assist in user interface design, predict the performance of operators using complex systems, and predict movement time for assembly line work.

The ETTO Principle, Erik Hollnagel