The National Incident Management System (NIMS) is a systematic, proactive approach to guide departments and agencies at all levels of government, nongovernmental organizations, and the private sector to work together seamlessly and manage incidents involving all threats and hazards—regardless of cause, size, location, or complexity—in order to reduce loss of life, property and harm to the environment. The NIMS model for incident management is the Incident Command System (ICS). ICS is a standardized on-scene emergency management organization designed to aid in the management of resources during incidents. The ICS model is used by jurisdictions and agencies, both public and private, to organize field-level incident-management operations. ICS is sometimes referred to as the Incident Management System (IMS); the terms are interchangeable.