The size-up of an incident begins:

• A. At arrival on scene
• B. Before the incident with dispatch information
• C. With peer consensus encounters to the incident
• D. A plan of operation

Answer: (B)

Size-up starts before you even arrive, using the details provided by dispatch and any pre-incident planning. That early information lets you anticipate what you’ll face—building type, occupancy, potential hazards, access and egress, water supply, weather, and available resources—so you can outline initial priorities and a rough approach while en route. When you arrive, you verify and adjust your assessment as conditions develop, and the plan of operation then stems from that ongoing evaluation. Relying on pre-arrival information is essential because it enables proactive, safer choices and faster resource decisions.