Differentiate leading and lagging process safety metrics with examples.

• A. Leading metrics are proactive measures such as training hours, inspections, and MOC closures; lagging metrics are outcomes like incidents and spills.
• B. Leading metrics measure outcomes after events.
• C. Lagging metrics predict future safety performance.
• D. Leading metrics are not used in process safety.

Answer: (A)

Leading metrics focus on proactive activities that reduce risk before anything happens. They track what you do to prevent incidents, such as how many training hours people receive, how often inspections are completed, and how many management-of-change closures are finalized. These are inputs and actions that build safer operations.

Lagging metrics, on the other hand, look at the outcomes after events or failures have occurred. They measure what happened, like the number of incidents, spills, injuries, or releases. They tell you the consequences and help assess whether preventive controls were effective, but they don’t provide early warning.

So the statement matches the fundamental distinction: proactive, preventive activities are leading metrics, while actual incidents and spills are lagging metrics. Both types matter for a complete process safety picture, with leading metrics enabling preemptive improvements and lagging metrics confirming results.