Which principle dictates that a person can report to only one supervisor?

The principle that states a person can report to only one supervisor is known as unity of command. This principle is significant because it establishes a clear line of authority and responsibility within an organization. When each individual has a single direct supervisor, it helps to eliminate confusion over reporting relationships and prevents conflicting instructions or priorities that may arise when a person reports to multiple supervisors.

Moreover, this principle ensures accountability, as it is easier to determine who is responsible for an individual's actions and performance. In emergency services, such as firefighting, this clarity is essential for effective communication and command during operations, thereby ensuring that everyone knows their roles and responsibilities.

The other concepts, while related to management and organizational structures, do not specifically dictate reporting relationships in the same way as unity of command. Span of control, for instance, relates to how many individuals can be effectively managed by a supervisor but doesn't define the reporting structure. Division of labor focuses on task specialization within a team, and discipline pertains to maintaining order and adherence to regulations within an organization.