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How do you unlock the door?
This
picture shows the locks on our front door.
To unlock
the dead bolt lock (above), you turn the key to the
right. To unlock
the door knob lock (below), you turn the key
to the left! That's pretty confusing!
I checked a few other doors, and this seems to
be the way they work too. I would hope they don't
all work like this!
Design suggestion
Controls that have the same function should be operated in the same way. For example, both locks should be unlocked by turning the key in the same direction. This is an example of what is meant in human factors by "consistency" in design.
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Copyright © Michael J. Darnell 1996-2010. All rights reserved.
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