According to FEMA, the span of control of personnel is typically between:

The recommended span of control for personnel, as outlined by FEMA, is typically between three and seven individuals. This range is considered optimal for effective management and supervision during operations.

When the span of control is within this range, it allows for clear communication, effective leadership, and the ability to provide adequate oversight. Supervisors can manage tasks without being overwhelmed, ensuring that each team member receives the guidance and support they need. Beyond seven subordinates, it becomes increasingly difficult for a supervisor to maintain effective oversight and communication, which can lead to confusion and inefficiency during emergency operations.

The other spans mentioned fall outside the optimal range defined by FEMA. A span of control that is too narrow can lead to unnecessary management layers, while a span that is too broad may compromise the effectiveness of command and control. Therefore, the specified range of three to seven is recognized as a best practice in incident management scenarios.