What directive establishes a single comprehensive national incident management system the allows all levels of government to work efficiently and effectively together?

The directive that establishes a single comprehensive national incident management system is the National Response Framework (NRF), which is part of the broader framework of the National Incident Management System (NIMS). NIMS provides a consistent nationwide approach for federal, state, local, tribal, and territorial governments to work together during incidents, ensuring effective coordination and resource management. This framework promotes a unified command structure and enhances communication and collaboration across all levels of government and the private sector.