Fitt’s Law for mobile devices

Little Springs Design have published a couple of short pieces on applying Fitt’s Law to mobile devices.

“Fitt’s Law (circa 1954) states that the time to acquire a target is a function of the distance to the target and the size of the target. The further the target is away from the user’s current position, the longer it takes to move to the target. The smaller the target, the more the user has to use fine muscle control and hence take more time to move.”