What does 'unity of command' mean in NIMS?

Unity of command is a fundamental principle in the National Incident Management System (NIMS) that ensures clear communication and responsibility within a command structure. It emphasizes that each individual involved in a response or operational scenario reports to one designated supervisor. This structure prevents confusion and conflicting directives, as having a singular supervisor simplifies the chain of command and enhances accountability. It helps maintain order during incidents where coordination among multiple agencies and personnel is critical, ensuring that all team members understand their specific roles and responsibilities. This clarity supports effective decision-making and operational execution during complex incidents.