Thursday, November 08, 2007

Common Usability Terms, pt. IV: Fitts' Law

Fitts' Law discussed in detail ...

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Fitts' Law is an interesting beast. It is one of the few consistently proven (and therefore reliable) laws in ergonomics, it is more than 50 years old, but at the same time, it has been cited so often on the internet that is has been beaten senseless, making it almost sound ridiculous. So, what is Fitts' Law? How did he come up with it? And is it truly applicable to computer mouse cursor movements?

Fitts' law is actually a formula [like Wikipedia, we use the Shannon formulation] that describes the time it will take for someone to move a device (stylus, finger, etc.) from one target to another (T), taking several things into account: the constants start/stop time of the device used (a) and the inherent speed of the device (b), and the variables distance between starting point and target (D) and the width of the target along the axis of motion (W). The consequence of this formula is that speed and accuracy are dependant on the width of the target and/or the distance between starting point and the target."    (Continued via OSNews)    [Usability Resources]

Fitts' Law - Usability, User Interface Design

Fitts' Law

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