Aviation safety relies on measurement—but not all safety metrics are equal.
Indicators are typically divided into:
- lagging indicators (after events occur)
- leading indicators (before events occur)
Understanding the difference is essential for managing risk proactively.
Lagging Indicators
Lagging indicators measure outcomes that have already occurred, such as:
- accidents
- incidents
- safety reports
They are useful for:
- identifying failures
- analysing past events
But they do not prevent future occurrences.
Leading Indicators
Leading indicators measure conditions that influence future safety performance.
These include:
- training quality
- fatigue levels
- reporting trends
- system deviations
They provide early signals of risk.
Why the Distinction Matters
A system relying only on lagging indicators is reactive.
A system using leading indicators can:
- identify emerging risk
- intervene earlier
- reduce accident probability
This aligns with:
Connection to Risk Accumulation
Leading indicators help detect early stages of:
👉Risk Accumulation in Aviation
before it becomes visible through incidents.
System-Level Perspective
Indicators must be interpreted in context:
Isolated data points do not reflect system behaviour—patterns do.
Conclusion
Leading and lagging indicators represent two ways of understanding safety.
Effective aviation safety systems rely on both—but prioritise early detection over post-event analysis.
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