Explaining Fitt's Law

30 Jan 2004 - 1:34pm
10 years ago
1 reply
633 reads
Kevin Cheng
2004

Todd R. Warfel wrote:
"But back to Fitz's Law, it still remains "near" the corner, one of the most
easily accessible areas, that is if you're running X. However, if you're
running Classic, then the Trash can can be moved anywhere on the desktop,
which completely violates Fitz's law."

Fitts' Law doesn't say anything about corners in the sense of the location.
The corner isn't useful unless the hotspot is right against the edge.
Meaning I can flick my mouse to the bottom right and no aiming is involved.
Elizabeth wasn't splitting hairs, she's stating the only point about Fitts's
law that's useful. For example, the Win95 Start button was "near" the corner
but actually not quite there. Hence, it completely lost any advantage it
would have had.

Kevin Cheng
kc at ok-cancel.com
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Comments

30 Jan 2004 - 1:57pm
Elizabeth Buie
2004

Kevin Cheng writes:

>Elizabeth wasn’t splitting hairs, she’s stating the only point about
Fitts’s law that’s useful. For example, the Win95 Start button was “near”
the corner but actually not quite there. Hence, it completely lost any
advantage it would have had.

That isn't exactly what I said. I would rephrase your last statement to
read, "Hence, it had considerably less advantage than it would have had."
I completely disagree with your "completely". :-)

I think that if it's near enough to the corner, that's useful. Not as
good as being "in" the corner, but better than being two inches away. It
helps to reduce the target acquisition time because you can zip the
pointer to the corner (which has effectively infinite size) and boom!
you've got a very short distance left to go. Almost any direction you can
move will get you to the Trash very quickly.

This is not the case with the Dock, where you can overshoot the target in
any horizontal direction.

Elizabeth

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