What does the term "Size-up" refer to in firefighting?

The term "Size-up" refers specifically to the process of evaluating the situation upon arrival on the scene. This critical step involves assessing the fire's nature, its location, the structure involved, and any potential risks to both firefighters and civilians. During this evaluation, firefighters gather essential information, such as the fire's size, the presence of occupants, structural integrity, and environmental factors that may affect their response.

Effective size-up allows responders to make informed decisions about tactics, resource allocation, and safety measures, establishing a foundation for their firefighting strategy. This process is vital to ensure the safety of both the firefighting team and the public, as it helps in identifying immediate and long-term hazards that may arise during the operation. Understanding the situation allows for dynamic and effective decision-making in the heat of an incident.