It is important to keep interface items that are similar in close proximity to one another in order to reduce the distance between them and thereby improve usability under the Fitts' law model.
In most other ways, a Fitts' law experiment is similar to any other experiment that seeks to measure human behaviour under circumstances of interest.
Correct answer is: produce the most accuracy
Fitts' Law informs us, in essence, of the following: As the movement amplitude (A) grows, so does the movement time (MT).
As targeting accuracy requirements rise, or as target width (W) narrows, MT rises.
in brief, Fitts' Law tells us the following: Movement time (MT) increases as the movement amplitude (A) increases. MT increases as the aiming accuracy requirement increases, that is, as target width (W) decreases.
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