In the hierarchy of controls used to protect workers from hazards, which control method is most preferred?

• A. Personal protective equipment
• B. Administrative controls
• C. Engineering controls
• D. Exposure and worker health monitoring

Answer: (C)

Engineering controls are the most preferred because they reduce or remove the hazard at its source, protecting all workers without relying on individual behavior. By changing the environment or system—such as adding guards, enclosing processes, or improving ventilation—the exposure is lowered before it can affect people, making it more reliable than measures that depend on proper use of protective gear or strict adherence to procedures.

Protective equipment is important but is the last line of defense; it depends on proper selection, fit, use, and maintenance, and it protects individuals rather than reducing the hazard for everyone. Administrative controls, like training or work practices, help but rely on consistent human compliance and can be bypassed. Monitoring for exposure or health effects detects problems but does not prevent them.

So, engineering controls sit highest in the hierarchy because they address the hazard directly and broadly.