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ICS and EOC organizational structures develop in a modular fashion based on an incident's size, complexity, and hazard environment.
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National Incident Management System (NIMS) is the culmination of more than 40 years of efforts to improve interoperability in incident management. This work began in the 1970s with local, state, and Federal agencies collaborating to create a system called Firefighting Resources of California Organized for Potential Emergencies (FIRESCOPE). FIRESCOPE included ICS and the Multiagency Coordination System (MACS). In 1982, the agencies that developed FIRESCOPE and the National Wildfire Coordinating Group (NWCG) created the National Interagency Incident Management System (NIIMS), in part to make ICS guidance applicable to all types of incidents and all hazards. Under Homeland Security Presidential Directive #5 (February 2003), the Federal government created the National Incident Management System (NIMS). This system directed the creation of a comprehensive, national approach to incident management. Recognizing the value of these systems, communities across the Nation have adopted NIMS. The most current revision of NIMS was released in October 2017.
NIMS Management Characteristics
The following characteristics are the foundation of incident command and coordination under NIMS and contribute to the strength and efficiency of the overall system:
Common Terminology
NIMS establishes common terminology that allows diverse incident management and support organizations to work together across a wide variety of functions and hazard scenarios. This common terminology covers the following:
agencies, preparing a written IAP becomes increasingly important to maintain unity of effort and effective, efficient, and safe operations.
Staff in EOCs also typically conduct iterative planning and produce plans to guide their activities during specified periods, though these are typically more strategic than IAPs.
Manageable Span of Control
Maintaining an appropriate span of control helps ensure an effective and efficient incident management operation. It enables management to direct and supervise subordinates and to communicate with and manage all resources under their control. The type of incident, nature of the task, hazards and safety factors, experience of the supervisor and subordinates, and communication access between the subordinates and the supervisor are all factors that influence manageable span of control.
The optimal span of control for incident management is one supervisor to five subordinates; however, effective incident management frequently necessitates ratios significantly different from this. The 1:5 ratio is a guideline, and incident personnel use their best judgment to determine the actual distribution of subordinates to supervisors for a given incident or EOC activation.
Incident Facilities and Locations
Depending on the incident size and complexity, the Incident Commander, Unified Command, and/or EOC director establish support facilities for a variety of purposes and direct their identification and location based on the incident. Typical facilities include the Incident Command Post (ICP), incident base, staging areas, camps, mass casualty triage areas, points-of-distribution, and emergency shelters.
Comprehensive Resource Management
Resources include personnel, equipment, teams, supplies, and facilities available or potentially available for assignment or allocation. Maintaining an accurate and up-to- date inventory of resources is an essential component of incident management. Section II, the Resource Management component of this document, describes this in more detail.
Integrated Communications
Leadership at the incident level and in EOCs facilitates communication through the development and use of a common communications plan, interoperable communications processes, and systems that include voice and data links. Integrated communications provide and maintain contact among and between incident resources, enable connectivity between various levels of government, achieve situational awareness, and facilitate information sharing. Planning, both in advance of and during an incident, addresses equipment, systems, and protocols necessary to achieve integrated voice and data communications. Section IV, the Communications and Information Management component of this document, describes this in more detail.
Establishment and Transfer of Command
The Incident Commander or Unified Command should clearly establish the command function at the beginning of an incident. The jurisdiction or organization with primary responsibility for the incident designates the individual at the scene responsible for establishing command and protocol for transferring command. When command transfers, the transfer process includes a briefing that captures essential information for continuing safe and effective operations, and notifying all personnel involved in the incident.
Unified Command
When no one jurisdiction, agency or organization has primary authority and/or the resources to manage an incident on its own, Unified Command may be established. In Unified Command, there is no one “commander.” Instead, the Unified Command manages the incident by jointly approved objectives. A Unified Command allows these participating organizations to set aside issues such as overlapping and competing authorities, jurisdictional boundaries, and resource ownership to focus on setting clear priorities and objectives for the incident. The resulting unity of effort allows the Unified Command to allocate resources regardless of ownership or location. Unified Command does not affect individual agency authority, responsibility, or accountability.
Chain of Command and Unity of Command
Chain of command refers to the orderly line of authority within the ranks of the incident management organization. Unity of command means that each individual only reports to one person. This clarifies reporting relationships and reduces confusion caused by multiple, conflicting directives, enabling leadership at all levels to effectively direct the personnel under their supervision.
Accountability
Effective accountability for resources during an incident is essential. Incident personnel should adhere to principles of accountability, including check-in/check-out, incident action planning, unity of command, personal responsibility, span of control, and resource tracking.
Dispatch/Deployment
Resources should deploy only when appropriate authorities request and dispatch them through established resource management systems. Resources that authorities do not request should refrain from spontaneous deployment to avoid overburdening the recipient and compounding accountability challenges.
Complex Incidents are larger incidents with higher incident complexity (normally Type 1 or Type 2 incidents) that extend into multiple operational periods and rapidly expand to multijurisdictional and/or multidisciplinary efforts necessitating outside resources and support.
According to NIMS 2017, Incident Complex refers to two or more individual incidents located in the same general area and assigned to a single Incident Commander or Unified Command.
Position Titles
Organizational Element Leadership Position Title Support Positions Incident Command Incident Commander Deputy Command Staff Officer Assistant Section Chief Deputy, Assistant Branch Director Deputy Divisions/Groups Supervisor N/A Unit Unit Leader Manager, Coordinator Strike Team/Resource Team/Task Force
Leader Single Resource Boss
Single Resource Boss, Leader N/A Technical Specialist Specialist N/A
ICS Organizational Structure and Elements
ICS – Who Does What?
Incident Commander
The Incident Commander is technically not a part of either the General or Command Staff. The Incident Commander is responsible for:
Incident Management Team
An Incident Management Team (IMT) is a rostered group of ICS-qualified personnel consisting of an Incident Commander, Command and General Staff, and personnel assigned to other key ICS positions. The level of training and experience of the IMT members, coupled with the identified formal response requirements and responsibilities of the IMT, are factors in determining “type,” or level, of IMT.
Command Staff
The Command Staff is assigned to carry out staff functions needed to support the Incident Commander. These functions include interagency liaison, incident safety, and public information.
Command Staff positions are established to assign responsibility for key activities not specifically identified in the General Staff functional elements. These positions may include the Public Information Officer (PIO), Safety Officer (SO), and Liaison Officer (LNO), in addition to various others, as required and assigned by the Incident Commander.
General Staff
The General Staff represents and is responsible for the functional aspects of the Incident Command structure. The General Staff typically consists of the Operations, Planning, Logistics, and Finance/Administration Sections. In some incidents the General Staff may also include the Intelligence/Investigations Function, either operating under a staff section, or as a stand alone section.
General guidelines related to General Staff positions include the following:
Assistants
Additional Command
Operations Section Chief Responsibilities
The Operations Section Chief is responsible for managing all tactical operations at an incident. The Incident Action Plan (IAP) provides the necessary guidance. The need to expand the Operations Section is generally dictated by the number of tactical resources involved and is influenced by span of control considerations.
Major responsibilities of the Operations Section Chief are to:
Planning Section Chief Responsibilities
The Planning Section Chief is responsible for providing planning services for the incident. Under the direction of the Planning Section Chief, the Planning Section collects situation and resources status information, evaluates it, and processes the information
for use in developing action plans. Dissemination of information can be in the form of the IAP, in formal briefings, or through map and status board displays.
Major responsibilities of the Planning Section Chief are to:
Logistics Section Chief Responsibilities
The Logistics Section Chief provides all incident support needs with the exception of logistics support to air operations. The Logistics Section is responsible for providing:
Intelligence/Investigations Function
The collection, analysis, and sharing of incident-related information are important activities for all incidents. Typically, staff in the Planning Section are responsible for gathering and analyzing operational information and sharing situational awareness, and staff in the Operations Section are responsible for executing tactical activities.
However, some incidents involve intensive intelligence gathering and investigative activity, and for such incidents, the Incident Commander or Unified Command may opt to reconfigure intelligence and investigations responsibilities to meet the needs of the incident. This may occur when the incident involves a criminal or terrorist act and/or other non-law-enforcement intelligence/investigations efforts such as epidemiological investigations.
The purpose of the Intelligence/Investigations function is to ensure that intelligence and investigative operations and activities are properly managed and coordinated to:
The Incident Commander or Unified Command makes the final determination regarding the scope and placement of the Intelligence/Investigations function within the command structure. The intelligence/investigations function can be incorporated as an element of the Planning Section, in the Operations Section, within the Command Staff, as a separate General Staff section, or in some combination of these locations.
Additional information on the I/I function can be found in NIMS and in the Intelligence and Investigations Function Guidance and Field Operations Guide available on the FEMA website https://www.fema.gov/nims-doctrine-supporting-guides-tools.
Deputies
The Incident Commander may have one or more Deputies. An individual assuming a Deputy role must be equally capable of assuming the primary role. Therefore, a Deputy Incident Commander must be able to assume the Incident Commander's role.
Following are three reasons to designate Deputies:
The Operations Section Chief, Planning Section Chief, Logistics Section Chief, Finance/Administration Section Chief, and Branch Directors may also have one or more Deputies.
Assistants
The Public Information Officer, Safety Officer, and Liaison Officer may have Assistants, as necessary. The Assistants may represent assisting agencies or jurisdictions, or simply assist in managing the workload associated with the position.
The Assistant title indicates a level of technical capability, qualification, and responsibility subordinate to the primary positions.
Technical Specialists
Certain incidents or events may require the use of Technical Specialists who have specialized knowledge and expertise. Technical Specialists may function within the Planning Section, or be assigned wherever their services are required.
While each incident dictates the need for Technical Specialists, some examples of the more commonly used specialists are: