Incident Command and Scene Management
Core Concepts
Understand the incident command system as a scalable, modular structure: command, operations, planning, logistics, and finance/administration, with intelligence/investigation and safety added as needed. Know span of control (commonly three to seven with five as a working target), unity of command, transfer of command, and the difference between single command and unified command for multi-agency events. Master the incident action plan cycle, the tactical worksheet, and the difference between a strategy, an objective, and a tactical assignment. Understand division/group structure, staging, accountability systems, and the purpose of a personnel accountability report (PAR).
Traps to Watch
Questions blur command and unified command-unified command is for multiple agencies with jurisdiction, not merely multiple units. Watch for span-of-control violations disguised as efficiency. Transfer of command requires a face-to-face or radio briefing, not just a radio announcement. The safety officer has authority to halt unsafe operations but does not command the incident. Confusing the planning section's role (collecting and evaluating information, predicting) with operations (directing tactics) is a frequent distractor.
Worked Example
A commercial building fire with three engines, a ladder, and a mutual-aid battalion chief arriving: the first-arriving officer establishes command and passes a brief arrival report. When the second chief arrives, command transfers only after a formal briefing covering situation, objectives, assignments, and safety. Rule of thumb: if you cannot state your objectives in one sentence, you have not established command effectively.
Rule of Thumb
Span of control of five is the working target; when a supervisor exceeds it, add a division or group rather than shouting louder.