Abstract
In the present study, the effect of the existence of written procedures for the task performance to manage unexpected situations has been evaluated using simulation environment of a smart grid. Scenarios for expected situation have been constructed based on the events that have not been presented to subjects in advance. Subjects have been divided into two groups. Subjects in group A are not given written procedure that enables effective operation for the predefined situations, while subjects in group B have been instructed to follow the procedure strictly. The results imply that the task performance evaluated based on the number of causing blackout degrades for the subjects following procedure when they face the unexpected situations.