Span of Control 09 : The maximum number of subordinates who can be directly supervised by one person without a loss of efficiency, usually from 3 to 8 in fire suppression
Ralph W. Burklin & Robert G. Purington, Fire Terms: A Guide to Their Meaning and Use, National Protection Association, Boston, MA 1980 USA. (Guide: Meaning and Use, Nat Prot Association Fr Srvc - Amer) {457}