Incident Command System, Chain of Command, and Span of Control
What the exam tests
ICS, Chain of Command, and Span of Control tests how you fit into the incident organization: who you take direction from, how you pass information, and why span of control matters on a fireline.
Core rules
- Unity of command: each person reports to one supervisor. If two supervisors give conflicting orders, clarify through your chain; do not freelance.
- Chain of command is the formal line for orders and information; skip it only when immediate safety requires it, then inform your supervisor.
- Span of control is commonly 3–7 subordinates per supervisor, with 5 as a planning guide; a crew boss with too many independent elements loses control.
- Transfer of command is face-to-face or by briefing when possible, covering situation, resources, tactics, and safety.
- Know your supervisor, your subordinates, and the next operational period's assignment.
Worked example
A FFT1 is told by a division supervisor to hold a section of line and by a dozer boss to move for a blade pass. The FFT1 should not simply obey the loudest voice. The dozer boss coordinates through the division supervisor or the agreed tactical plan; the FFT1 confirms the hold assignment with the division supervisor and moves only when the line is covered. The reasoning is unity of command and safe equipment separation.
Traps
Freelancing; bypassing the chain for routine requests; accepting a span of control that is too wide; failing to brief a transfer of command.