The smooth operation and success of the Terrain Exercise are almost entirely dependent on the Director's ability and tactical knowledge, the care he takes in selecting the ground, preparing the problem, and his preparation for the Terrain Exercise. The subsequent special situations must occur in a logical order. The Director must have in mind a solution to the problem's various situations and must become familiar with all of its phases so that he can provide a reasonable answer to any question that may be posed. He must be careful not to overly criticize the students when they make mistakes or have bad attitudes.