Exercise 2: Applying Fitts's Law to a Frequently-Clicked Save Button — Possible Solution
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Fitts's Law says movement time depends on the target's own distance
(D) and width (W) - a larger, closer target is genuinely faster to
reach and click. Two concrete decisions follow directly from this for
a button that gets clicked constantly throughout a long session.

First, make the button large. A bigger target directly increases W in
the real formula, lowering the index of difficulty and reducing the
time it takes to reach and click it accurately, which matters a lot
for an action repeated many times over a session.

Second, place the button somewhere close to where the user's cursor
already tends to be during editing, rather than tucked in a distant
corner the user has to travel to every time - reducing D has the same
kind of real, measurable effect as increasing W. An even stronger
option, per the chapter's own "infinite edges" finding, is anchoring
it to a screen edge (or ideally a corner) - the cursor can't overshoot
past the edge, making the target effectively infinite in that
direction and genuinely easier to hit without needing to slow down
near the end of the movement.

ANSWER: Two concrete decisions: make the button genuinely large
(increasing its width lowers the real difficulty per Fitts's formula),
and place it close to where the cursor already tends to sit during
editing, ideally anchored to a screen edge or corner to take advantage
of the "infinite edges" effect - both reduce the real time it takes to
reach and click it, which compounds significantly over a long session
with constant repeated clicks.

WHY THIS WORKS AS AN ANSWER
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This correctly applies both variables in Fitts's real formula (size
and distance) to a concrete design decision, and connects the answer
to the chapter's own specific "infinite edges" finding rather than
only restating the general law.