Field Coordination Mechanisms

The structure of OCHA's field presence varies in size and scope depending on the demands of the emergency.  In both natural disasters and complex emergencies, the USG/ERC, in consultation with the IASC, determines when and how OCHA responds at the onset of a crisis, and then periodically reviews the coordination arrangements once the mission is underway.

OCHA typically becomes involved in the initial response to a crisis only when and if it reaches such proportions that it requires a multi-sectoral international response.