Fitts’s Law and Its Applications in UX

The movement time to a target depends on the size of the target and the distance to the target.


This content originally appeared on NN/g latest articles and announcements and was authored by Raluca Budiu

Summary: The movement time to a target depends on the size of the target and the distance to the target.



Paul Fitts was one of the first psychologists who understood that human error is attributable to poor design as opposed to just human fallacy. He studied airplane-cockpit design during World War II and argued that many losses that had been attributed to human error were, in fact, due to poor design.

In the 1950s, he became influenced by the Shannon’s famous information theory . Like George Miller, who applied the concept of channel capacity to human memory and, in the process, came up with the famous magical number 7 as the bandwidth of human short-term memory , Fitts aimed to find the bandwidth of human movement — how many repetitive movements could be performed in a given time interval. He did several experiments involving such repetitive movements and as a result he came up with Fitts’s law, one of the most famous laws of human-computer interaction.

Fitts’s Law

Fitts’s law gives us the relationship between the time it takes a pointer (such as a mouse cursor, a human finger, or a hand) to move to a particular target (e.g., physical or digital button, a physical object) in order to interact with it in some way (e.g., by clicking or tapping it, grasping it, etc.):



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This content originally appeared on NN/g latest articles and announcements and was authored by Raluca Budiu


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