Created by United Nations General Assembly resolution 46/182 in 1991, the Inter-Agency Standing Committee (IASC) is the longest-standing and highest-level humanitarian coordination forum of the United Nations system. It brings together the executive heads of 18 organizations to formulate policy, set strategic priorities and mobilize resources in response to humanitarian crises. With members from within and outside the United Nations, the IASC strengthens collective humanitarian action through the implementation of a coherent, unified response. Towards that end, the IASC advocates for common humanitarian principles and makes strategic, policy and operational decisions with a direct bearing on humanitarian operations on the ground. The IASC is chaired by the Emergency Relief Coordinator, who facilitates the leadership role of the United Nations Secretary-General. The IASC regularly convenes to ensure preparedness and a rapid and coordinated humanitarian response. Through the Emergency Relief Coordinator (ERC) the IASC also brings critical issues to the attention of the United Nations Secretary-General and the United Nations Security Council. The IASC is supported by subsidiary bodies as well as groups of experts who inform and carry out the priorities set by the IASC.