Business continuity planning is an important concept brought to the forefront by the September 11, 2001, terrorist attacks on the World Trade Center and the Pentagon, including the flight that ended in Pennsylvania with the bravery of the citizens on board when they brought down their own plane, which was controlled by terrorists and targeting another site. Other incident types that have spurred the development of the business continuity concept include hurricanes, tornadoes, and other massive weather events that cause considerable damage in the community. These often catastrophic events serve as graphic reminders that people must remain ready for all events in facilities management.