What is the timing on the 'arrival window concept'?

• A. 5-minute size up report
• B. 10-minute size up report
• C. 20-minute size up report
• D. 15-minute size up report

Answer: (D)

The arrival window concept means you should complete a concise size-up within 15 minutes of arriving on scene. This 15-minute window gives you enough time to quickly assess and document critical factors—scene safety, location, nature of the incident, number of people involved, hazards, suspects or weapons, and the initial action plan—without delaying response. It strikes a balance between speed and thoroughness, ensuring you can communicate a clear understanding of the situation and what resources are needed.

Five minutes tends to be too tight for a meaningful assessment; ten minutes may be used in some contexts but isn’t the standard here; twenty minutes would risk delaying crucial decisions and scene management. Thus, the 15-minute size-up is the best fit for the arrival window.