picture shows the locks on our front door.
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!
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"