Essential functions are those functions that enable an organization to:

• Provide vital services.
• Exercise civil authority.
• Maintain the safety and well-being of the general populace.
• Sustain the industrial and economic base during an emergency.

Some essential functions are defined in Federal or State laws, local ordinances, or executive directives.

Agencies and jurisdictions should work together closely to be sure they identify all essential functions. Critical interdependencies must also be identified. For example, the 911 dispatch center is interdependent with fire, police, and emergency medical services. Recognizing critical interdependencies will help to identify critical infrastructure, such as communication systems, that must remain operational.