Two groups of helicopter technicians filled out data forms after completing maintenance and repairs as routine procedure. When information stating what changes had been made in the system as a result of data collected from the forms was given to the experimental group, the mean error-rate in completing the forms fell significantly from 58.2% to 46.5%. The experimental group had a significantly lower average error-rate (24.6%) than the control (50.6%). The control group's performance was not different from pre-experimental levels.
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