The document discusses the Global Shelter Cluster and the Cluster Approach used in coordinating humanitarian shelter responses. It provides background on the origins of the Cluster Approach from the 2004 Humanitarian Response Review. The purpose of the Cluster Approach is to ensure more predictable leadership, defined responsibilities, and timely and effective responses through strengthened partnerships between humanitarian organizations. The document outlines the structure, roles, and functions of the Shelter Cluster at both the global and field levels, including challenges that sometimes occur in implementing the Cluster Approach.