As part of the Secretary-General's programme of reform in 1998, DHA was reorganized into the Office for the Coordination of Humanitarian Affairs, OCHA. Its mandate was expanded to include the coordination of humanitarian response, policy development and humanitarian advocacy.
OCHA carries out its coordination function primarily through the Inter-Agency Standing Committee, which is chaired by the ERC. Participants include all humanitarian partners, from UN agencies, funds and programmes to the Red Cross Movement and NGOs. The IASC ensures inter-agency decision-making in response to complex emergencies. These responses include needs assessments, consolidated appeals, field coordination arrangements and the development of humanitarian policies.