Unity Of Command

Unity of command ensures that a member reports directly to and receives orders from only one individual. One person must have control over one segment of the organization and that individual is responsible for issuing all orders and receiving all reports from that segment. To ensure all personnel know whom they direct and to whom they report, the lines of authority must be clearly established.

Keep it clear and unambiguous.

From: OPNAVINST 3120.32C Navy SORM