Sources indicated at the end of each definition are listed at the end of the glossary.)

An individual actively engaged in killing or attempting to kill people in a confined space or other populated area, most often using firearms and following no pattern or method in the selection of vic [..]

Report that summarizes key exercise-related evaluation information, including the exercise overview and analysis of objectives and core capabilities. (HSEEP 2013)

The effect of an event, incident, or occurrence. (NPG)

a coordinated, supervised activity usually employed to validate a specific operation or function in a single agency or organization. Drills are commonly used to provide training on new equipment, deve [..]

An ongoing plan for responding to a wide variety of potential threats and hazards. (NIMS)

An instrument to train for, assess, practice, and improve performance in prevention, protection, mitigation, response, and recovery capabilities in a risk-free environment. Exercises can be used for t [..]

Intelligence or operational information that warns of a credible, specific, and impending terrorist threat or ongoing attack against the United States and its territories that is sufficiently specific [..]

An occurrence, caused by either human action or natural phenomena, that may cause harm and may require action. Incidents can include major disasters, emergencies, terrorist attacks, terrorist threats, [..]

A standardized on-scene emergency management construct specifically designed to provide an integrated organizational structure that reflects the complexity and demands of single or multiple incidents, [..]