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Bruce Tognazzini is the founder of the Apple Human Interface Design Group (and he also has done many other important things). He has been writing a column called “Ask Tog” for some time now, and the column is about his field of expertise; User Interface.

The first article of his I read was “A Quiz designed to give you Fitts.” When I took the quiz I didn’t do so well, so I’ll give a hint to anyone who isn’t a UI expert before you look at it. The following is pretty important in getting any of the answers to the quiz correct:

Fitts’s Law states that the time to acquire a target is a function of the distance to and size of the target.