Predicts time to move hand to target given the distance and size of the target

T_pos = I_M log₂(2*Distance/Size)

i.e: Time is longer the further the target is away and the smaller it is.

Fitts law shown to match use of mouse well.

How about a user with motor impairments?

Next: Hick Hyman Law

Back: HCI Models

— Simon Judge 2006/02/23