"Managed by the Department of Homeland Security, the Interagency Special Events Working Group (SEWG) is the core of an interagency process that involves various agencies of the Federal government. Within the Special Events Working Group (SEWG), Federal departments and agencies provide input and recommendations concerning Special Events based on their respective authorities, responsibilities, and fields of expertise. The SEWG is co-chaired by designees from DHS Headquarters, the U.S. Secret Service, FEMA, and the FBI, and is currently composed of representatives from over 40 Federal departments and agencies that have responsibilities and/or association with Special Events security and incident management. The SEWG develops the Prioritized List of Special Events, recommends Special Event Homeland Security (SEHS) Levels, and is the single forum that ensures comprehensive and coordinated Federal interagency awareness of and support to designated Special Events. The Prioritized List of Special Events is the single interagency resource delineating domestic events, activities, or meetings that do not rise to the level of a National Security Special Event (NSSE), but which nevertheless are significant. Using a risk-based approach to weigh vulnerabilities and consequences against threats, the SEWG develops the Prioritized List of Special Events from event recommendations submitted by each state, territory and the District of Columbia. The events are categorized into one of the four SEHS levels using objective criteria including but not limited to: size; threat; symbolic or political significance; duration; location; number and type of attendees; media coverage; dignitary participation; proximity of critical infrastructure; and state and local capabilities. Federal support is scaled according to the SEHS level. SEHS-IV only requires maintaining Federal situational awareness of the event while a wide variety of Federal prevention, protection, and response resources may be provided for SEHS-I events. Events that do not reach the threshold of SEHS-IV are not included on the list. Each SEHS level is defined as: (1) SEHS-I: An event of large magnitude and significant national and/or international importance requiring significant Federal support and situational awareness. This designation requires the appointment of a Federal Coordinator and the development of an Integrated Federal Support Plan. (2) SEHS-II: An event of medium magnitude and average national and/or international importance requiring Federal support and situational awareness. This designation also requires the appointment of a Federal Coordinator and the development of an Integrated Federal Support Plan. (3) SEHS-III: An event of low magnitude and low national and/or international importance requiring limited Federal support and situational awareness. Monitoring and Federal coordination for support are accomplished through the Homeland Security Operations Center (HSOC) and the SEWG. (4) SEHS-IV: An event that requires Federal awareness but does not warrant direct Federal support or involvement. DHS may assist state and local jurisdictions by providing training and exercise opportunities through existing and/or tailored programs. The HSOC will maintain awareness of the event". (MO SEMA (Department of Public Security), Missouri Hazard Analysis, Annex Q: Special Events Considerations, October 2006, p. Q-7). Note: Replaced by Special Event Assessment Report events. (DHS, Office of Operations Coordination, Interagency Planning Workshop, November 29, 2007, slide #26)