How is a single-tiered system defined?

• A. One agency responding with a fire apparatus staffed with firefighter/paramedics
• B. All agencies respond to a single incident commander
• C. Only EMS responds without fire apparatus
• D. Two agencies with separate apparatus

Answer: (A)

A single-tiered system means one agency takes the lead and provides the initial response with a fire apparatus that is staffed by firefighter-paramedics. This setup delivers both fire suppression capabilities and advanced medical care from a single, integrated unit, on a single dispatch, without waiting for additional agencies or separate ambulances to arrive. It streamlines command and resource use, so on-scene care begins quickly and the incident is managed by one organization.

This differs from scenarios where multiple agencies are involved or where EMS arrives separately from fire resources, which describes multi-agency or multi-tier responses rather than a single, unified unit.