In firefighting, what does the term "size-up" refer to?

The term "size-up" in firefighting refers to the assessment of a situation. This crucial process involves gathering information about the incident scene, including the nature of the fire, the structure involved, potential hazards, and the resources available. Size-up is typically conducted upon arrival at the scene and can include visual assessments, communications with incident command and other responders, as well as information from witnesses. This assessment is vital for determining the appropriate strategy and tactics to effectively manage and mitigate the incident safely. Thorough size-up helps in making informed decisions that ensure the safety of both the firefighters and civilians involved.