Principle
Pair the early signal with the outcome it is meant to protect
A preventive metric can improve while the protected outcome stays flat.
When it fits
- A team improves a leading metric and is tempted to declare the underlying risk solved.
When to avoid it
- Rare outcomes may be too sparse for quick validation, and many factors can affect them. The pair supports learning; it does not prove causality.
Why it matters
Track the leading signal and a lagging outcome together. The leading measure tells you whether the preventive process is changing; the lagging measure tests whether the protected result moves in the intended direction. If the leading metric improves without the outcome, inspect the assumed link, data quality, delay and possible gaming instead of celebrating the proxy.
An example
Faster response to hazard reports is an early process measure. Recurring serious hazards or incident rates remain outcome checks; one should not silently replace the other.
Check your result
Every important leading metric has a named protected outcome or an explicit reason why direct outcome measurement is not feasible.
Keep this limit in mind
- Rare outcomes may be too sparse for quick validation, and many factors can affect them. The pair supports learning; it does not prove causality.
Evidence and sources
OSHA distinguishes leading indicators that reveal preventive activity or emerging problems from lagging indicators that measure outcomes that already occurred, and recommends using both.
A metric is not useful merely because it is early; it still needs to be specific, interpretable and connected to a decision.
Leading Indicators · Leading Indicators overview