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Designing Better UX by Smashing Magazine

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When You Shouldn’t Use Fitts’s Law To Measure User Experience

By Anastasios Karafillis

The key statement of Fitts’s Law is that the time required to move a pointing device to a target is a function of the distance to the target and its size. In layman’s terms: the closer and larger a target, the faster it is to click on that target. This is easy to understand, not too difficult to implement and it doesn’t seem to make much sense to contradict such a simple and obvious statement.

However, before you start applying Fitts’s Law on every single pixel you can find, consider a few problems that might arise for you as an interaction designer.

Fitts’s Rule Number 1: Create Larger Targets

The likely most prominent statement derived from Fitts’s Law is that ...

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