02/10/2026
SAFETY BARRIERS — One Barrier Is Never Enough!
Incidents rarely happen because of one single failure. They often occur when multiple safety barriers fail or are bypassed at the same time.
The Swiss Cheese Model reminds us that every control can have weaknesses. That’s why we need multiple layers of protection:
🔧 Engineering Controls — Guarding, isolation/LOTO, ventilation, safety devices
📋 Administrative Controls — PTW, JSA/RA, procedures, training & inspections
👷 Behavioral Controls — Following procedures, correct PPE use, reporting unsafe conditions
🛡️ Mitigating Barriers — Emergency shutdown, fire protection, evacuation & emergency response
When the weaknesses in these barriers line up, a hazard can pass through and become an incident, potentially resulting in injury, equipment damage, environmental harm, or financial loss.
Never rely on a single control. Strong safety comes from multiple independent barriers working together.