The Clark Regional Continuity of Operations (COOP) approach moves away from the traditional labels of “essential” and “non-essential” and instead uses Mission Essential Functions (MEFs) and Disaster Essential Functions (DEFs). This terminology better reflects how government services actually operate—both during daily operations and in times of disruption—while recognizing that staff roles may shift depending on the situation.
By using MEFs and DEFs, the Clark Regional Approach provides clarity for staff, supports effective planning, and allows agencies to respond more flexibly while continuing to deliver the daily services the community relies on—both during routine operations and in times of emergency.
| Mission Essential Function (MEF) | Disaster Essential Function (DEF) |
| The core functions a department must continue during an emergency because they are required by law, policy, or directive, and are critical to sustaining ongoing operations. These functions remain a priority regardless of the type of incident. For example, ensuring payroll is processed or maintaining a safe and reliable water supply are mission essential functions that must continue even during disruptions. | Functions that are activated only during emergencies. They are flexible and incident-specific, designed to meet the unique demands created by a disaster. Activities such as staffing an Emergency Operations Center (EOC), operating an incident call center, or supporting a vaccine clinic are examples of disaster essential functions. |
| Mission Essential Personnel | Disaster Essential Personnel |
| Staff whose daily duties directly support Mission Essential functions and generally do not change during an incident. | Staff who may shift from their normal duties or adapt their roles to support needs created by an incident. |