The primary cause in many accidents is the Captain's failure to control, and the Co-pilot's failure to monitor.
Crew members are the final opportunity to stop errors, but the crew are also human.
Specifically, the goal is to develop effective interpersonal communication, stress management, and task allocation skills so that decision making during abnormal or emergency situation is optimized. Aviation psychologists can draw inferences about the psychological processes of pilots and controllers by analyzing the errors that they have made. The aviation psychologist will look at incidents and accidents. Incidence refers to the mistakes that did not result in an accidents. An accident can be attributable to pilot or air traffic controller error.