Human-machine mismatch is a special case of  inter-unit mismatch, when at least one of the units is a human operator.

Examples

• The operational scenario does not match the machine situation.
• Exceptional change of an operational parameter.

Case studies

• 1967 Torrey Canyon Supertanker disaster. The operator was not aware of the navigation in control mode, in which the steering rod was disconnected from the wheel at the helm
• 1979 TMI nuclear power plant accident. The operators were not aware of the backup pumps being closed following a maintenance procedure.

The problem of operator-machine cooperation

This problem is realized in mode confusion, when the operators fail to recognize the machine state, or when the machine behavior does not suit the operator's intentions.

Updated on 04 Nov 2016.