System 21 : An integrated combination of people, property, environment, and processes that work in a coordinated manner to achieve a specific desired output under specific conditions
Federal Emergency Management Agency FEMA, U.S. Department of Homeland Security DHS, Glossary of Terms Used in the Assistance to Firefighters Grants Program, Washington, DC, USA 2015. https://emilms.fema.gov/IS100b/glossary.htm, (FEMA - Amer) {64}