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Mental
Model
With
complex automated systems, the user's mental model directly impacts
operating decisions and emergency response. The user's mental model
is his/her concept and mental representation of how the system operates.
A correct understanding of the system is particularly needed in
response to infrequent or unusual system events. In safety critical
systems, lack of a accurate and complete mental model can lead to
disastrous results. The meltdown at Chernobyl was attributed to
a lack of understanding of how the reactor operated on the part
of the operators, technicians, and specifically the engineer who
developed the test that required by-passing safety controls.
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