The purpose of this all-hazards how-to guide is to provide state, local, tribal and territorial (SLTT) jurisdictions with information and guidance related to setting up, operating, maintaining and deactivating an EOC that successfully meets the jurisdiction’s needs. This guidance applies an all-hazards approach in its concepts, processes and principles. FEMA recognizes that certain hazards (such as COVID-19) may have specific implications, precautions and instructions that take effect under certain conditions and threat environments.