Unity of command. 'For any action whatsoever, an employee should receive orders from one superior only. Such is the rule of unity of command (...) Should it be violated, authority is undermined, discipline is in jeopardy, order disturbed and stability threatened.' We will find in our later discussion that many modern concepts of organization are totally contradictory to Fayol's principle. Fayol regarded 'dual command' as one of the greatest sins of management, leading to uncertainty and hesitation on the part of subordinates and conflict between managers.