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Saturday, May 21, 2011

Improving Usability with Fitts’ Law


Back in 1954, psychologist Paul Fitts published an article the detailed his theory on human mechanics as it pertained to aimed movement. It was Fitts’ observation that the action of pointing to or tapping an target object could be measured and predicted mathematically.


Fitts stated that the size of the target object along with its distance from the starting location could be directly measured, allowing him to model the ease at which a person could perform the same action with a different target object. In 1954, this theory had no application for computers yet; however, it shouldn’t take a modern designer long to discover the powerful meaning this formula has in the context of user interfaces.

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