What is the purpose of size-up in live-fire operations?

• A. To identify potential hazards and determine safety zones.
• B. To memorize the building color.
• C. To estimate crew workload only.
• D. To ignore wind direction.

Answer: (A)

Size-up in live-fire operations is the ongoing, systematic assessment of the scene to identify hazards and establish safety zones. This means evaluating building construction and condition, occupancy, access and egress, potential for collapse, utilities, and current fire behavior, including wind, smoke, and heat. The goal is to inform the incident action plan so crews know where it’s safe to operate, where to stage, how to ventilate, and how to move to escape routes if conditions worsen. It also helps determine resource needs and whether to pursue interior tactics or shift to a defensive stance, all with the safety of firefighters as the priority.

Memorizing building color isn’t relevant to safety or tactics. Focusing on crew workload alone misses the broader, critical information gathered during size-up. And wind direction is a key factor in fire behavior and ventilation; ignoring it would undermine safety and effectiveness.