What is span of control in FEMA?

Span of Control refers to the number of participants and/or resources a supervisor will oversee during an incident or event-type scenario. This can be anywhere from 1:3 to 1:10 depending on the size of the incident, per the National Incident Management System instructions. Usually it will be the lower number but in some cases, especially with law enforcement related incident, a 1:10 ratio will be common.