What is the default span of control, in terms of student to instructor ratio?

• A. 4:1
• B. 5:1
• C. 6:1
• D. 3:1

Answer: (B)

Span of control is the number of students one supervisor can effectively oversee during a live-fire evolution. For NFPA 1403, the default practice is five students per instructor. This ratio provides enough proximity for clear direction, quick observation, and immediate intervention if something unsafe starts to happen, while keeping communication and supervision manageable for the instructor in charge. It also supports proper accountability and coordination across the different tasks and roles within the evolution. If the situation is more complex or riskier, the span of control may be reduced; if it’s simpler and highly experienced personnel are involved, it could be adjusted accordingly, but five students to one instructor is the standard default.