I’m curious why you seem to think that Fitt’s law doesn’t apply to touch interfaces. Sure, certain concepts can’t be translated 1:1 (like infinite sized targets at screen edges) but even those have somewhat similar counterparts in touch interfaces (screen edges are also special places with larger targets in touch interfaces).
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I guess all those experts citing Fitts' Law have to find a new toy when touchscreens get the predominant means to interact with the UI.
According to Wikipedia (for what that's worth), Fitts' law has been established to apply just fine to touch interfaces (third paragraph under http://en.wikipedia.org/wiki/Fitts%27s_law#Success_and_impli... ).
I’m curious why you seem to think that Fitt’s law doesn’t apply to touch interfaces. Sure, certain concepts can’t be translated 1:1 (like infinite sized targets at screen edges) but even those have somewhat similar counterparts in touch interfaces (screen edges are also special places with larger targets in touch interfaces).
How are screen edges no longer infinite? If I ask you to tap something and drag it off an edge of the screen, you don't have to aim.
Your finger won’t be stopped by the screen edge.
So, it takes the same amount of time to tap something on a touchscreen, no matter what size it is and how far away it is from your finger, then?