Abstract :
Expertise is a special skill or knowledge. An
advanced expert also knows the boundaries of that
special knowledge. Knowing the boundaries of what
is known and not known about a topic puts the expert
in the best position to teach, provide medical care or
design new questions. Experts continually struggle
to maintain their expertise. However, despite
substantial efforts, the goal to be on top of the full set
of information in a topic and know the boundaries of
that information is elusive
