What is the primary purpose of scene size-up?

• A. To plan an immediate, safe approach by evaluating hazards, resources, access, and forming an initial plan.
• B. To perform a full, multi-hour debrief after rescue.
• C. To determine the total time required to complete operation.
• D. To decide which unit should be assigned to non-emergency tasks.

Answer: (A)

Scene size-up is the rapid on-scene assessment you perform right after arriving. Its main purpose is to identify hazards that could threaten responders or victims, determine what resources are available, assess access and egress, and form an initial plan of action that can be carried out safely and effectively. This quick evaluation helps decide if entry is safe, which routes to use, how many rescuers are needed, what equipment to pull, and how to coordinate with teammates. It sets the tactical approach and helps prioritize actions to protect lives while minimizing risk. The other options describe steps that come later or tasks not driven by the immediate on-scene assessment: a full debrief happens after the operation, estimating total time is part of planning but not the primary purpose of size-up, and assigning personnel to non-emergency tasks isn’t determined by the initial scene assessment.