"The purpose of this training is to explain the concept of vulnerability and its relationship to overall community risk from a firefighting perspective. Each hazard must be viewed from the community's vulnerability. Vulnerability is the susceptibility to suffer harm or loss from an event. Vulnerability may vary based on numerous factors such as preparedness, capability of emergency services, etc. Vulnerability also may vary for the same hazard from area to area in the same community."
Coffee Break Training - Fire Prevention and Public Education Series No. FM-2011-10
United States Fire Administration: http://www.usfa.fema.gov/