Here
is the control panel in the elevator of a nice hotel
in Los Angeles.
Imagine that you just checked into the hotel.
You are standing in the elevator and you
push the button for the 5th floor to go up to
your room. Nothing happens. You push it again.
The elevator still doesn't go.
You try pushing some of the other buttons. Still
nothing. You begin to wonder if the elevator
is out of order!
Another guest in the hotel notices your
problem and tells you what's wrong.
They had the same problem when they
arrived! You need to
insert your room card in the elevator before
it will work.
You look on the
control panel for a place to insert
your card.
Humm,... You think you need to slide the card in the vertical crack? You try sliding the card and pushing the button. It doesn't work. You flip the card over and try again. This time it works!
Because a guest is more likely to
push a button than to insert their room card,
the elevator could prompt the guest to insert their
room card after a button is pressed. Such prompting
could be done, for example, by dynamically
increasing (or blinking) the illumination
of the card reader and its labeling following the
button press.
Copyright © Michael J. Darnell 1996-2010. All rights reserved.