Which stage of size-up focuses on assessing the structure upon arrival?

The phase of size-up that focuses on assessing the structure upon arrival is the Arrival stage. During this phase, firefighters gather critical information about the building's condition, occupancy, and the potential hazards present. This is the moment when responders visually evaluate the scene to determine the necessary tactics and resources required for effective firefighting.

In the Arrival stage, responders might look for indicators such as smoke movement, fire conditions visible from the exterior, structural integrity, and any immediate threats to life or property. This assessment is crucial because it informs decision-making and allows for timely action tailored to the unique circumstances of the incident. By conducting a thorough and swift evaluation of the structure upon arrival, firefighting teams can establish a clear operational strategy to address the situation effectively.