Establishment of the ICS modular organization is the responsibility of the Incident Commander (IC) (or Unified Command when multiple agencies share command).

Quick Scoop

  • In the Incident Command System (ICS), the structure “builds out” in a modular way as an incident grows or becomes more complex.
  • The person who decides which positions to activate and how the organization will expand is the Incident Commander.
  • As the situation escalates, the IC can delegate responsibilities to Section Chiefs and other roles, but the ultimate responsibility for establishing and expanding the modular organization remains with the IC.

So if you see the exam-style prompt
“Establishment of the ICS modular organization is the responsibility of the ______,”
the correct fill‑in answer is: Incident Commander (or Unified Command in multi‑jurisdiction incidents).

Information gathered from public forums or data available on the internet and portrayed here.