# Fitts' law

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**Fitts' law** is a predictive model in human-computer interaction that describes the time it takes for a person to move a pointing gadget (such as a mouse) to a target area. It suggests that the time it takes to reach a target is influenced by how far away it is and how big it is.

Fitts' law states that it takes longer to reach a target that is smaller and/or farther away. It is faster to reach a target that is closer and/or larger.

Fitts' law can be extended to 3D.