The workforce and its corrective action program constitute the first line of defense against accidents. Which statement describes this?

• A. The workforce must be diligent in reducing human errors and promptly addressing issues via the corrective action program
• B. The first line of defense is the built-in barriers alone
• C. Only emergency systems determine safety
• D. Operator actions are optional

Answer: (A)

The core idea is that people, supported by a formal process, are the first line of defense against accidents. The workforce must be diligent in reducing human errors and promptly addressing issues via the corrective action program. When issues are noticed, reported, investigated, and followed up with effective corrective actions, the likelihood of a small problem growing into an incident is greatly reduced. This proactive use of the corrective action program helps catch root causes early and prevents recurrence, which is why this description best captures the role of the first line of defense. Built-in barriers and emergency systems are crucial parts of defense in depth, but they rely on people and proper processes to be effective, and operator actions are fundamental, not optional.