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" Personal relationships are the only thing that prevents breakdown in the systems structure. There is constant need for arbitration of conflicts between various members of the system, for adjudication of disputes or jurisdiction, on direction, on budgets, on people, on priorities, and so on. The most important people, regardless of their job descriptions or assigned tasks, spend most of their time keeping the machinery running. In no other organizational structure is the ratio between output and effort needed for internal cohesion as unfavorable as in the systems structure. "
― Peter F. Drucker , Management: Tasks, Responsibilities, Practices