Determining exactly which units to send to a call depends on the location of the incident and:

The classification of the incident is essential in determining which units to send to a call because it provides critical information regarding the nature of the emergency. Each type of incident, whether it's a structure fire, a vehicle accident, a medical emergency, or a hazardous materials situation, requires different resources and skill sets.

For example, a structure fire might necessitate sending an engine company and a ladder company to ensure both fire suppression and access to upper floors. In contrast, a medical emergency may require an ambulance and a specialized medical unit. By classifying the incident accurately, the dispatch can tailor the response to optimize the effectiveness and efficiency of the firefighting or emergency medical response.

This classification also helps fire departments allocate resources appropriately, ensuring that they are prepared for the specific demands of each type of incident, ultimately leading to improved outcomes for those affected by the emergency.