When is it crucial to perform a size-up on an incident scene?

Performing a size-up during initial arrival at an incident scene is critical for several reasons. This process involves assessing the situation to gather vital information that will inform decision-making and tactical responses. During the initial phase, responders can evaluate the extent of the emergency, identify hazards, determine the number of personnel needed, and formulate strategies for either rescue or fire suppression.

Gathering this information early allows the incident commander to establish priorities, allocate resources effectively, and ensure the safety of both firefighters and civilians. A thorough size-up can reveal vital details such as the type of emergency, the potential for fire spread, structural integrity, and the presence of victims, which are essential for developing a successful action plan.

Conducting a size-up after the fire is under control, in the presence of civilians, or only after assessing equipment needs does not capitalize on the opportunity to make timely decisions that could impact the outcome of the incident. Therefore, the approach during initial arrival is pivotal in establishing the foundation for effective incident management.