Which NIMS Structure Makes Cooperative Multi-Agency Decisions? MAC Groups Explained

Which NIMS structure makes cooperative multi-agency decisions? The answer is the Multiagency Coordination Group, commonly known as a MAC Group. During complex emergencies, this NIMS structure helps government agencies, jurisdictions, nonprofit organizations, and private-sector partners coordinate priorities and make cooperative decisions. Each participating organization may have different legal authorities, policies, budgets, operational responsibilities, and resource limitations.

A MAC Group gives senior representatives a structured way to coordinate policy, resolve competing priorities, and determine how scarce resources should be allocated. It supports incident management without replacing the Incident Commander, Unified Command, Emergency Operations Center, or dispatch organization.

FEMA describes MAC Groups as policy-level bodies that support resource prioritization and allocation, make cooperative multiagency decisions, and enable coordination among elected officials, appointed officials, agency executives, and incident leadership.

This guide explains what a MAC Group does, who serves on it, how it makes decisions, and how it differs from Unified Command, the Incident Command System, Emergency Operations Centers, Area Command and other NIMS structures.

Quick Answer: Which NIMS structure makes cooperative multi-agency decisions?

The correct answer is the Multiagency Coordination Group, or MAC Group.

A MAC Group:

• Acts as a policy-level coordination body.
• Brings together agency administrators, executives, and authorized representatives.
• Makes cooperative decisions affecting multiple organizations or jurisdictions.
• Provides senior-level policy guidance.
• Prioritizes scarce resources among competing incidents or needs.
• Connects elected and appointed officials with incident leadership.
• Usually reaches decisions through member consensus.
• May operate in person or virtually.
• Can support both incident response and recovery.
• Does not direct tactical operations at the incident scene.

The key distinction is simple:

Unified Command jointly manages incident operations. A MAC Group jointly coordinates policy and scarce-resource priorities.

Key Takeaways

• The correct FEMA answer is Multiagency Coordination Group.
• MAC Groups are sometimes called policy groups.
• Their primary responsibilities are policy guidance and resource prioritization.
• Members are usually agency administrators, executives, or authorized designees.
• Representatives should have sufficient authority to speak for their organizations and make appropriate commitments.
• MAC Groups typically make decisions through consensus.
• They do not replace the Incident Commander or Unified Command.
• Emergency Operations Centers coordinate information and support, while MAC Groups focus on senior policy and competing resource priorities.
• A MAC Group is one component of the broader Multiagency Coordination System.
• Local laws, plans, and delegations determine the exact authority of a MAC Group.

What Is the National Incident Management System?

The National Incident Management System, or NIMS, is a nationwide framework that helps government agencies, nongovernmental organizations, and private-sector partners manage incidents together.

NIMS can be applied to incidents of any size, cause, location, or complexity. It may be used during:

• Local emergencies.
• Planned public events.
• Major wildfires.
• Hurricanes and floods.
• Hazardous-material incidents.
• Cyber incidents.
• Public-health emergencies.
• Infrastructure failures.
• Multijurisdictional disasters.

NIMS gives participating organizations a shared vocabulary, standardized organizational structures and common processes for managing resources, coordinating operations and communicating information.

It is not:

• A single emergency response plan.
• Limited to the Incident Command System.
• Used only during federally declared disasters.
• Reserved only for police, fire or emergency medical personnel.
• A fixed organizational chart that must look identical during every incident.

Instead, NIMS is scalable and adaptable. Organizations apply its structures according to the incident’s size, hazards, geography, complexity and legal authorities.

The Three NIMS Guiding Principles

NIMS is built around three guiding principles.

Flexibility

NIMS structures can expand, contract or adapt according to changing incident conditions.

A small incident may need only an Incident Commander and a few resources. A major regional emergency may require Unified Command, several EOCs, a MAC Group and a coordinated Joint Information System.

Standardization

Common terminology and standardized structures improve coordination among personnel who may never have worked together before.

Standardization helps prevent confusion over:

• Job titles.
• Resource names.
• Reporting relationships.
• Incident facilities.
• Communication procedures.
• Operational responsibilities.

Unity of Effort

Unity of effort means coordinating activities among separate organizations to achieve shared objectives while each organization retains its own authority and accountability.

This principle is central to understanding MAC Groups.

A MAC Group does not merge participating agencies into one permanent organization. Instead, it creates a structured way for them to coordinate policies and priorities while maintaining their separate legal responsibilities.

The Three Major Components of NIMS

NIMS contains three major components.

The question Which NIMS structure makes cooperative multi-agency decisions? belongs primarily to the Command and Coordination component.

Resource Management

Resource Management covers the processes used to:

• Identify resource requirements.
• Type and inventory resources.
• Qualify and credential personnel.
• Order and acquire resources.
• Mobilize resources.
• Track personnel and equipment.
• Reassign or demobilize resources.
• Address reimbursement and restoration.

Resources may include:

• Personnel.
• Emergency teams.
• Vehicles.
• Aircraft.
• Medical supplies.
• Communications equipment.
• Facilities.
• Food and water.
• Technical specialists.
• Heavy machinery.

Command and Coordination

Command and Coordination describes how leadership responsibilities are organized at the incident scene, in support facilities, and at the senior policy level.

It includes:

• Incident Command System.
• Emergency Operations Centers.
• Multiagency Coordination Groups.
• Joint Information System.

Communications and Information Management

This component helps ensure that responders, EOC personnel, policy officials, and the public receive accurate information at the appropriate time.

It addresses:

• Incident communications.
• Information security.
• Situational awareness.
• Information sharing.
• Common operating pictures.
• Public-information coordination.
• Communication interoperability.

The Four NIMS Command and Coordination Structures

NIMS identifies four interconnected Command and Coordination structures.

When an incident occurs, personnel generally use the Incident Command System to manage on-scene operations.

As the incident becomes larger or more complex, an Emergency Operations Center may activate to coordinate information, plans, and resources.

A MAC Group provides senior policy guidance and resolves competing resource priorities.

The Joint Information System helps all participating organizations communicate consistent and accurate information to the public.

NIMS Decision-Making Levels at a Glance

The four structures can also be understood according to their decision-making levels.

This separation reduces conflicting instructions.

The MAC Group addresses policy and competing resource needs. The EOC coordinates support. The Incident Commander or Unified Command determines how assigned resources will be used operationally. The JIS communicates approved information to the public and stakeholders.

Which NIMS Structure Makes Cooperative Multi-Agency Decisions?

The Multiagency Coordination Group is specifically established and organized to make cooperative multi-agency decisions.

MAC Groups operate primarily at the policy and strategic coordination level. They enable administrators, executives, and authorized representatives to make decisions that affect more than one agency, jurisdiction, or incident.

Several other NIMS structures involve multiple organizations, but their responsibilities are different:

• Unified Command jointly manages and directs incident operations.
• Emergency Operations Centers coordinate information, plans, requests, and resource support.
• The Joint Information System coordinates public information.
• Area Command may oversee multiple ICS organizations.
• MAC Groups establish policy guidance and prioritize scarce resources.

The FEMA wording about making cooperative multiagency decisions specifically refers to the MAC Group.

What Does MAC Stand for in NIMS?

In NIMS, MAC stands for Multiagency Coordination.

The complete term is Multiagency Coordination Group.

You may also encounter:

• MAC Group.
• Multiagency Coordination Group.
• Multi-Agency Coordination Group.
• Policy group.

FEMA commonly uses the closed spelling multiagency. The hyphenated spelling appears in the focus keyword because it reflects how many users search for the question online.

What Is a Multiagency Coordination Group?

A MAC Group is a body of senior representatives from organizations that are involved in, affected by or contributing resources to an incident.

It provides a forum for decisions that should not be made independently by one organization.

Those decisions may affect:

• Multiple jurisdictions.
• Several simultaneous incidents.
• Different levels of government.
• Public and private organizations.
• Regional resource availability.
• Critical infrastructure.
• Response and recovery priorities.

A MAC Group may include:

• Agency administrators.
• Government executives.
• Elected officials.
• Senior appointed officials.
• Emergency-management leaders.
• Authorized agency designees.
• Representatives from organizations contributing resources.
• Nongovernmental organizations.
• Volunteer organizations.
• Private-sector businesses.
• Critical-infrastructure operators.
• Technical specialists.

Organizations with specialized knowledge, community relationships, or important resources may participate even when they do not have direct command responsibilities.

MAC Groups Are Flexible

There is no single membership list that applies to every emergency.

A public-health emergency may involve:

• Health-department officials.
• Hospital administrators.
• Medical-supply organizations.
• Laboratory representatives.
• Emergency managers.
• Transportation agencies.

A widespread power failure may involve:

• Utility executives.
• Public-safety administrators.
• Telecommunications providers.
• Transportation officials.
• Healthcare representatives.
• Local and state emergency managers.

Membership should reflect the actual authorities, resources, and policy questions involved.

Why Are MAC Group Decisions Cooperative?

MAC Group decisions are cooperative because participating organizations work toward coordinated outcomes while retaining their separate legal authorities.

For example, a county government, state public-health department, utility company and nonprofit relief organization may all participate in the same MAC Group.

Each organization remains responsible for its own:

• Personnel.
• Resources.
• Policies.
• Budget.
• Legal authority.
• Regulatory requirements.
• Operational obligations.

The MAC Group gives these organizations a structured way to:

• Share information.
• Understand competing needs.
• Resolve policy conflicts.
• Establish regional priorities.
• Coordinate resource decisions.
• Support common incident goals.

Cooperative Does Not Mean Command

A cooperative decision may determine which county receives a limited search-and-rescue team first.

It would not normally determine:

• Which street the team searches.
• Which personnel enter a structure.
• How field supervisors assign tasks.
• Which tactical method responders use.

Those operational decisions remain within the Incident Command System.

Core Responsibilities of a MAC Group

MAC Group responsibilities generally fall into five major areas.

1. Making Cooperative Multiagency Decisions

MAC Groups create a formal setting for decisions involving more than one organization or jurisdiction.

These decisions may involve:

• Regional incident priorities.
• Allocation of scarce resources.
• Requests for state or federal support.
• Conflicting agency policies.
• Continuity of essential public services.
• Access to critical infrastructure.
• Emergency funding priorities.
• Administrative barriers.
• Cost-sharing issues.
• Transition from response to recovery.

The MAC Group examines the wider consequences of a decision rather than focusing only on one organization’s immediate needs.

2. Providing Policy-Level Guidance

MAC Groups provide senior-level guidance to:

• Emergency Operations Centers.
• Incident Commanders.
• Unified Command organizations.
• Agency executives.
• Other coordination bodies.

Policy guidance may address:

• Community priorities.
• Emergency authorities.
• Regional evacuation policies.
• Government or facility closures.
• Continuity of public services.
• Access restrictions.
• Mutual-aid priorities.
• Recovery objectives.
• Coordination across jurisdictional boundaries.

Policy guidance establishes priorities and operating boundaries. It should not become detailed tactical direction.

3. Prioritizing Scarce Resources

Resource prioritization is one of the most important MAC Group functions.

During a complex incident, several locations may request the same limited resources, such as:

• Firefighting aircraft.
• Search-and-rescue teams.
• Ambulances.
• Law-enforcement personnel.
• Medical supplies.
• Portable generators.
• Communications equipment.
• Fuel.
• Temporary shelters.
• Heavy machinery.
• Technical specialists.

When demand exceeds supply, the MAC Group may determine which incident or jurisdiction receives priority.

Life safety receives the highest priority. Other considerations may include responder safety, incident stabilization, infrastructure protection, and long-term community consequences.

4. Connecting Senior Officials With Incident Leadership

Elected officials, appointed officials, and agency executives need reliable information about:

• Threats to the public.
• Resource shortages.
• Infrastructure damage.
• Legal authorities.
• Financial requirements.
• Community concerns.
• Response progress.
• Recovery consequences.

Incident leadership also needs timely policy guidance and executive support.

MAC Groups create a structured connection between these levels without requiring political or agency leaders to assume tactical command.

5. Resolving Interorganizational Conflicts

Complex incidents may expose disagreements involving:

• Jurisdictional boundaries.
• Resource ownership.
• Financial responsibility.
• Regulatory authority.
• Evacuation policies.
• Facility access.
• Public messaging.
• Competing strategic priorities.

A MAC Group can address the policy and executive dimensions of these disputes while operational personnel remain focused on incident objectives.

What a MAC Group Does Not Do

A MAC Group does not normally:

• Direct firefighters, police officers, or medical personnel.
• Assign field tactics.
• Replace the Incident Commander.
• Replace Unified Command.
• Establish or operate the Incident Command Post.
• Develop the detailed Incident Action Plan.
• Supervise tactical operations.
• Replace the EOC.
• Replace dispatch or resource-ordering organizations.
• Automatically assume ownership of agency resources.
• Act as the Joint Information Center.

A MAC Group may decide that one incident should receive a limited aircraft before another incident. The Incident Commander or Unified Command determines how the aircraft is used after it is assigned.

How Does a MAC Group Make Decisions?

MAC Groups typically base decisions on member consensus.

Consensus does not always mean that every representative agrees with every detail. It generally means that participants work toward a decision their organizations can support or accept.

Members may consider:

• Immediate threats to life.
• Responder safety.
• Incident objectives.
• Resource availability.
• Competing requests.
• Legal requirements.
• Policy consequences.
• Critical-infrastructure effects.
• Vulnerable populations.
• Effects on neighboring jurisdictions.
• Available alternatives.
• Expected recovery needs.

Consensus vs. Command

Consensus-based coordination is different from command authority.

An Incident Commander may issue operational instructions within an established chain of command. MAC Group members generally represent separate organizations and may not have command authority over one another.

They therefore develop decisions through:

1. Information sharing.
2. Evaluation of competing needs.
3. Discussion of legal and policy limitations.
4. Consideration of alternatives.
5. Agreement on a coordinated priority or policy.
6. Communication through established channels.
7. Reassessment as conditions change.

What Authority Should MAC Group Representatives Have?

MAC Group representatives should have sufficient authority to speak meaningfully for their organizations.

Representatives may need authority to:

• Approve resource commitments.
• Commit funds within established limits.
• Accept shared policies.
• Coordinate agency actions.
• Request additional authorization.
• Communicate official agency positions.

This does not mean every member has unlimited financial or operational authority.

Each participating organization should define:

• What the representative may approve.
• Which resources may be committed.
• What financial limits apply.
• Which decisions require higher authorization.
• How quickly senior approval can be obtained.
• How commitments must be documented.

Representatives should also understand their organization’s:

• Mission.
• Legal authority.
• Current resource commitments.
• Operational capacity.
• Financial limitations.
• Mutual-aid obligations.
• Public responsibilities.
• Recovery priorities.

A representative who must seek outside approval for every routine decision can delay time-sensitive coordination.

Who Serves on a MAC Group?

Membership depends on the incident.

Possible participants include:

• Governors or their representatives.
• Tribal leaders.
• Mayors.
• City or county managers.
• County commissioners.
• State agency executives.
• Federal agency representatives.
• Emergency-management directors.
• Police and fire administrators.
• Public-health leaders.
• Public-works officials.
• Transportation executives.
• Utility-company representatives.
• Hospital administrators.
• Port, airport or transit officials.
• School-system representatives.
• Volunteer organizations.
• Business associations.
• Critical-infrastructure operators.
• Legal, financial and technical advisers.

Organizations directly affected by the incident or contributing resources should normally be represented.

Other organizations may participate because of their expertise, community relationships or ability to support response and recovery.

At What Level Can a MAC Group Be Established?

A MAC Group can be established at different governmental or organizational levels, including:

• Local.
• State.
• Tribal.
• Territorial.
• Federal.
• Regional.
• Private-sector.
• Discipline-specific.

A MAC Group may also be organized around a particular sector, such as:

• Emergency management.
• Public health.
• Transportation.
• Utilities.
• Healthcare.
• Critical infrastructure.
• Regional public safety.

The group’s authority depends on:

• Applicable laws.
• Emergency operations plans.
• Mutual-aid agreements.
• Agency policies.
• Executive authorities.
• Delegations of authority.
• Regional coordination agreements.

There is no universal legal authority automatically attached to the term “MAC Group.” Each jurisdiction or organization should define the group’s authority before an incident.

How MAC Groups Prioritize Scarce Resources

Several requests may be legitimate even when available resources are insufficient.

A disciplined process improves consistency, fairness and accountability.

1. Verify the Request

Members should understand:

• What resource is requested.
• Why it is needed.
• Which incident objective it supports.
• When it is needed.
• How long it will be required.
• What may happen if it is unavailable.
• Whether the request has been validated.

2. Evaluate Life-Safety Consequences

Questions may include:

• Is the public in immediate danger?
• Are responders at risk?
• How many people are threatened?
• Are people trapped, injured or unable to evacuate?
• Are vulnerable populations affected?
• Is urgent medical support required?

Life safety receives the highest priority.

3. Consider Incident Stabilization

Decision-makers consider whether the resource could:

• Prevent incident expansion.
• Stop a cascading failure.
• Protect critical infrastructure.
• Restore essential services.
• Reduce the duration of the emergency.
• Prevent conditions from becoming more dangerous.

4. Consider Property and Environmental Consequences

The group may assess:

• Threats to homes and businesses.
• Environmental contamination.
• Damage to essential facilities.
• Cultural or historical resources.
• Economic disruption.
• Long-term recovery costs.

5. Identify Alternatives

The exact requested resource may not be available, but a substitute may accomplish the mission.

Alternatives may include:

• Mutual-aid personnel.
• Private contractors.
• Temporary communications equipment.
• Different equipment types.
• Modified schedules.
• Personnel with equivalent qualifications.
• Resources from another jurisdiction.

6. Evaluate Mobilization Time

A resource may be technically available but unable to arrive soon enough.

Relevant factors include:

• Travel distance.
• Road conditions.
• Weather.
• Crew-rest requirements.
• Fuel.
• Maintenance.
• Credentialing.
• Licensing.
• Transportation availability.
• Expected assignment duration.

7. Consider Regional Consequences

Allocating a resource to one jurisdiction may reduce protection elsewhere.

The group should assess:

• Remaining coverage.
• Neighboring communities.
• Other active incidents.
• Forecast hazards.
• Future resource needs.
• Availability of replacements.

8. Document and Review the Decision

Documentation should identify:

• The request.
• Participating representatives.
• Information reviewed.
• The priority assigned.
• The decision.
• The rationale.
• Required follow-up.
• The next review time.

MAC Group Decision Checklist

This checklist is a practical educational tool rather than an official FEMA form.

How a MAC Group Fits Into Incident Decision-Making

The relationship among ICS, EOCs, and MAC Groups can be understood as a step-by-step process.

Step 1: Incident Personnel Assess Conditions

Responders and technical specialists evaluate:

• Hazards.
• Threats to life.
• Responder risks.
• Damage.
• Resource shortages.
• Weather.
• Expected incident growth.
• Community consequences.

Step 2: Incident Command Establishes Objectives

The Incident Commander or Unified Command establishes objectives such as:

• Rescue endangered people.
• Contain a wildfire.
• Control a hazardous release.
• Protect critical infrastructure.
• Evacuate threatened communities.
• Restore emergency communications.

Step 3: ICS Identifies Resource Requirements

The ICS organization determines which personnel, equipment, facilities, and supplies are required.

Within ICS:

• Operations supervises operational resources.
• Planning tracks resources and identifies shortages.
• Logistics orders resources.
• Finance/Administration handles costs, procurement, and claims when activated.

Step 4: Requests Follow Established Channels

Resource requests may move through:

• Dispatch centers.
• Departmental operations centers.
• Emergency Operations Centers.
• Mutual-aid systems.
• State coordination centers.
• Federal assistance processes.

Bypassing established ordering systems can create safety problems, poor accountability and inefficient resource use.

Step 5: The EOC Coordinates Support

The EOC may:

• Validate requests.
• Identify available resources.
• Contact assisting organizations.
• Order and track resources.
• Compare competing needs.
• Maintain situational awareness.
• Forecast future shortages.

Step 6: Scarcity Creates a Priority Decision

Routine coordination may become insufficient when several incidents request the same resource.

Examples include:

• Three fires requesting two aircraft.
• Several hospitals requesting one limited medical supply.
• Multiple communities needing the same generators.
• Several agencies requesting one communications unit.

Step 7: The MAC Group Establishes Priorities

The MAC Group reviews the regional or organizational picture and decides which requests receive priority.

Step 8: Supporting Organizations Implement the Decision

The decision is communicated to the EOC, dispatch center, resource owner, or another coordination organization.

That organization may:

• Process the request.
• Release or order the resource.
• Track its movement.
• Document the allocation.
• Update incident personnel.

Step 9: Incident Command Uses the Resource

The Incident Commander or Unified Command determines how the assigned resource will be used to accomplish incident objectives.

Step 10: Priorities Are Reassessed

MAC Group decisions may be reconsidered when:

• A new life-safety threat appears.
• Weather changes.
• An incident expands.
• Additional resources arrive.
• Critical infrastructure fails.
• A lower-priority incident becomes more urgent.
• Response operations begin transitioning into recovery.

MAC Group vs. Unified Command

Unified Command is the most common incorrect alternative because it also involves multiple agencies making joint decisions.

What Unified Command Does

Unified Command is an ICS structure used when multiple jurisdictions or organizations share authority or responsibility for an incident.

Its members jointly:

• Establish incident objectives.
• Determine incident priorities.
• Select strategies.
• Approve one Incident Action Plan.
• Allocate resources assigned to the incident.
• Direct integrated incident operations.

Each participating organization retains authority and accountability for its personnel and resources.

What a MAC Group Does

A MAC Group:

• Provides policy guidance.
• Coordinates senior officials.
• Prioritizes scarce resources across incidents or organizations.
• Resolves executive-level conflicts.
• Does not direct field tactics.
• Does not develop the Incident Action Plan.

Unified Command vs. MAC Group

Unified Command jointly manages the incident. A MAC Group jointly coordinates policy and scarce-resource priorities.

MAC Group vs. Incident Command System

The Incident Command System is the standardized structure used to manage on-scene incident activities.

MAC Group vs. Emergency Operations Center

An Emergency Operations Center is a physical or virtual location from which personnel coordinate information, resources, planning, and incident support.

EOC functions commonly include:

• Collecting and analyzing information.
• Maintaining situational awareness.
• Supporting resource requests.
• Ordering and tracking resources.
• Coordinating plans.
• Determining current and future needs.
• Communicating with incident personnel and other EOCs.

A MAC Group focuses more specifically on policy guidance and competing resource priorities.

Can EOC Staff Make Cooperative Multiagency Decisions?

In some organizational arrangements, EOC personnel may perform policy-level coordination functions.

This reflects NIMS’s flexibility and the fact that local laws, plans, and staffing models differ.

However:

• A MAC Group is specifically organized as a policy-level cooperative decision-making body.
• An EOC primarily coordinates information, plans, resources, and support.
• Some jurisdictions may integrate MAC Group representatives or similar policy functions into the EOC.

For an IS-700.B-style question, the expected answer remains Multiagency Coordination Group.

MAC Group vs. Joint Information System

The Joint Information System coordinates incident-related public information.

Its functions include:

• Developing coordinated interagency messages.
• Creating public-information strategies.
• Advising leadership about public concerns.
• Addressing rumors and inaccurate information.
• Delivering accurate and accessible information.

The distinction is:

• MAC Group: Coordinates policy and resource priorities.
• JIS: Coordinates public information.

A MAC Group may establish a regional closure policy. The JIS helps participating organizations communicate that policy consistently.

MAC Group vs. Area Command

Area Command is an ICS structure that may be established when:

• Multiple incidents have separate ICS organizations.
• One complex incident involves several incident-management teams.
• Senior oversight is needed across several Incident Command Posts.

Area Command remains part of incident management. A MAC Group operates at the senior policy and organizational level.

MAC Group vs. Multiagency Coordination System

A MAC Group and a Multiagency Coordination System are related but not identical.

Multiagency Coordination Group

A MAC Group is a specific policy-level body that supports cooperative decision-making and resource prioritization.

Multiagency Coordination System

MACS is the overarching NIMS command-and-coordination system that connects:

• Incident Command System.
• Emergency Operations Centers.
• MAC Groups.
• Joint Information Systems.

A MAC Group is one policy-level body. MACS is the wider coordination system in which it operates.

When Is a MAC Group Needed?

Not every incident requires a MAC Group.

A routine emergency may be managed through normal dispatch procedures, ICS, and existing agency authorities.

A MAC Group becomes more useful when:

• Several jurisdictions are affected.
• Multiple agencies have major responsibilities.
• Several incidents occur simultaneously.
• Critical resources are limited.
• Incidents compete for the same capabilities.
• Dispatch or EOC workloads become excessive.
• Policy conflicts require executive resolution.
• Existing mutual-aid authority is insufficient.
• Private-sector or nonprofit participation is important.
• Senior officials need a coordinated decision forum.
• Response decisions will significantly affect recovery.

How Is a MAC Group Activated?

Activation procedures vary by jurisdiction and organization.

A MAC Group may be activated through:

• An emergency operations plan.
• A regional coordination agreement.
• A mutual-aid agreement.
• A state or local emergency procedure.
• A hazard-specific plan.
• An executive decision.
• A request from an EOC.
• A predefined multijurisdictional protocol.

Plans should identify:

• Who may activate the group.
• Which organizations should participate.
• Who may represent each organization.
• What authority members possess.
• How decisions will be reached.
• How disagreements will be handled.
• How decisions will be documented.
• How incident information will reach members.
• How guidance will be communicated.
• What administrative support will be available.
• When the group should deactivate.

MAC Groups may operate from a physical location or virtually.

What Support Does a MAC Group Need?

Senior officials need concise, reliable, and decision-ready information.

A MAC Group may receive administrative and logistical support from an EOC or a separate support organization.

Support functions may include:

• Scheduling meetings.
• Establishing virtual conferences.
• Maintaining contact lists.
• Preparing situation briefings.
• Recording decisions.
• Documenting decision rationales.
• Tracking critical resources.
• Maintaining situation-status information.
• Coordinating legal and financial advice.
• Tracking action items.
• Supporting public-information coordination.
• Preserving records for after-action review.

A useful briefing should answer four questions:

1. What decision is required?
2. Why is the decision needed now?
3. What alternatives are available?
4. What are the likely consequences of each option?

Practical MAC Group Examples

The following scenarios are hypothetical educational examples.

Example 1: Multiple Wildfires Competing for Aircraft

Three counties are experiencing major wildfires. Each Incident Commander requests aircraft, but only two are available.

The EOC gathers information about:

• Communities at risk.
• Fire behavior.
• Evacuation routes.
• Weather.
• Critical infrastructure.
• Existing resources.
• Expected effectiveness of air support.

The MAC Group determines which incidents receive priority based on life-safety threats and stabilization needs.

Incident command determines the aircraft’s tactical assignments.

Example 2: Regional Hospital-Supply Shortage

Several hospitals request a limited supply of specialized medical equipment.

The MAC Group may include:

• Public-health officials.
• Hospital administrators.
• Emergency managers.
• Medical-supply representatives.
• Transportation officials.

Members assess patient urgency, available substitutes, delivery time, and regional healthcare capacity before establishing allocation priorities.

Clinical treatment decisions remain with qualified healthcare professionals.

Example 3: Generator Allocation After a Hurricane

A hurricane causes widespread power outages. Hospitals, water-treatment plants, shelters, and government facilities request generators.

The MAC Group may prioritize:

1. Facilities supporting immediate life safety.
2. Infrastructure preventing public-health emergencies.
3. Shelters serving displaced residents.
4. Other essential public services.

The EOC coordinates delivery and tracking. Facility personnel manage installation and operation.

Example 4: Multijurisdictional Evacuation Policy

A hazardous-material release threatens communities in two counties.

Unified Command manages operations near the release. The MAC Group coordinates broader policy questions involving:

• Evacuation boundaries.
• Shelter locations.
• Transportation assistance.
• School closures.
• Access restrictions.
• Support for people with access or functional needs.

The JIS coordinates public instructions.

Do MAC Groups Support Recovery?

Yes. MAC Groups may support both response and recovery.

As an incident transitions into recovery, policy decisions may involve:

• Restoring essential services.
• Reopening roads and schools.
• Temporary and permanent housing.
• Debris-removal policies.
• Recovery funding.
• Business continuity.
• Environmental restoration.
• Infrastructure priorities.
• Community assistance.
• Transition to normal operations.

Business organizations, volunteer groups and technical specialists may become particularly important during recovery because they provide community knowledge, resources and expertise.

Common Misconceptions About MAC Groups

Misconception 1: Unified Command Is the Correct Answer

Unified Command makes joint decisions about incident objectives, strategies and operations.

The MAC Group is the structure specifically associated with cooperative policy and resource-priority decisions.

Misconception 2: An EOC Commands Every Incident

EOCs generally coordinate information and support rather than directing on-scene tactics.

Local authorities may give an EOC additional responsibilities, but incident command normally retains operational control.

Misconception 3: A MAC Group Is a Larger Incident Command Post

A MAC Group is not an expanded Incident Command Post.

It is an off-site or virtual policy-level body.

Misconception 4: A MAC Group Owns Participating Agencies’ Resources

Organizations generally retain administrative authority over their personnel and equipment.

The MAC Group helps prioritize allocation through established laws, agreements, and procedures.

Misconception 5: MAC Group and MACS Mean the Same Thing

A MAC Group is one policy-level body.

MACS is the overarching coordination system that connects ICS, EOCs, MAC Groups, and the JIS.

Misconception 6: Every Incident Needs a MAC Group

Many incidents can be handled through routine ICS, dispatch and agency procedures.

MAC Groups are most valuable when policy conflicts, scarce resources, or multijurisdictional concerns exceed routine coordination capabilities.

Best Practices for an Effective MAC Group

Define Authority Before an Incident

Emergency plans should explain what the group may decide and what authority remains with:

• Elected officials.
• Agency executives.
• Incident Commanders.
• EOC directors.
• Resource owners.
• Legal authorities.

Select Representatives With Decision Authority

Members should be able to speak for their organizations within clearly established limits.

Establish Priority Criteria

Criteria may include:

• Life safety.
• Responder safety.
• Incident stabilization.
• Critical infrastructure.
• Vulnerable populations.
• Environmental consequences.
• Economic effects.
• Resource availability.
• Alternative capabilities.
• Recovery consequences.

Maintain Reliable Situational Awareness

The group needs current information from:

• Incident command.
• EOCs.
• Dispatch centers.
• Public-health systems.
• Utilities.
• Weather and hazard-monitoring organizations.
• Technical specialists.
• Private-sector partners.

Keep Policy and Tactics Separate

MAC Group members should avoid directing field assignments or bypassing the incident chain of command.

Document Decisions

Records should capture:

• Attendance.
• Requests reviewed.
• Information considered.
• Priorities established.
• Decisions and rationale.
• Follow-up assignments.
• Reassessment times.

Coordinate Public Information

Major policy or allocation decisions should be coordinated through the JIS so participating organizations communicate consistently.

Exercise the Process

Training and exercises can identify:

• Unclear authorities.
• Missing participants.
• Communication failures.
• Conflicting procedures.
• Weak documentation systems.
• Inadequate virtual-meeting capabilities.

NIMS Exam Question and Correct Answer

A FEMA training question may ask:

Which NIMS structure makes cooperative multi-agency decisions?

The correct answer is:

The Multiagency Coordination Group, or MAC Group.

Use this memory guide:

• ICS: Manages operations at the incident scene.
• EOC: Coordinates off-site information and support.
• MAC Group: Coordinates policy and scarce-resource priorities.
• JIS: Coordinates public information.

A simple memory phrase is:

MAC Groups make multiagency choices.

Conclusion: Which NIMS Structure Makes Cooperative Multi-Agency Decisions

So, which NIMS structure makes cooperative multi-agency decisions? The correct answer is the Multiagency Coordination Group, or MAC Group.

A MAC Group brings together agency administrators, executives and authorized representatives to address policies and priorities affecting multiple organizations or jurisdictions. Its members support resource allocation, resolve senior-level conflicts and connect elected and appointed officials with incident-management personnel.

The most important distinction is that a MAC Group supports incident management without replacing incident command:

• Incident Command or Unified Command directs operations.
• The EOC coordinates information and support.
• The JIS coordinates public messaging.
• The MAC Group coordinates policy and scarce-resource priorities.

MAC Groups typically work through consensus, may function virtually, and can support both response and recovery. Their representatives should have sufficient authority to speak for their organizations and make appropriate commitments within applicable legal, financial, and organizational limits.

Understanding this distinction provides both the correct FEMA exam answer and a clearer picture of how independent organizations maintain unity of effort during complex emergencies.

Which NIMS Structure Makes Cooperative Multi-Agency Decisions? FAQs

1. Which NIMS structure makes cooperative multi-agency decisions?

The Multiagency Coordination Group, or MAC Group, is the NIMS structure established to make cooperative multi-agency decisions. It provides policy guidance and supports the prioritization and allocation of scarce resources.

2. What is the main purpose of a MAC Group?

Its main purpose is to coordinate senior policy decisions and establish resource priorities when multiple agencies, jurisdictions, or incidents have competing needs.

3. Is a MAC Group part of the Incident Command System?

No. A MAC Group supports incident command and Emergency Operations Center activities, but it is not part of the on-scene ICS command structure.

4. Does a MAC Group direct tactical operations?

No. Tactical operations remain under the Incident Commander or Unified Command. The MAC Group provides policy guidance and resource priorities.

5. How does a MAC Group reach decisions?

MAC Groups generally reach decisions through member consensus. Representatives share information, assess competing needs, and agree on coordinated policies or priorities.

6. What is the difference between a MAC Group and Unified Command?

Unified Command jointly manages incident operations. A MAC Group operates at the policy level and coordinates broader resource priorities and executive decisions.

7. What is the difference between a MAC Group and an EOC?

An EOC coordinates information, plans, resource requests, and incident support. A MAC Group focuses on senior policy guidance and competing resource priorities.

8. Is a MAC Group the same as MACS?

No. A MAC Group is one policy-level body. MACS is the overarching NIMS command-and-coordination system that connects ICS, EOCs, MAC Groups, and Joint Information Systems.

Sofia Francis

Sofia Francis is a writer at Tycoonstory Media, specializing in business, startups, entrepreneurship, and marketing. She writes practical, research-based articles that help entrepreneurs, business owners, startup founders, and professionals understand market trends, growth strategies, digital marketing, and business opportunities. Her content focuses on making business knowledge simple, useful, and accessible for readers.

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