Overdue Deviation Investigation Rate Calculator

Use one process, asset or item scope, reporting period, cutoff, measurement unit, and written classification rule across both values. Open status and valid due dates come from the same snapshot. Approved extensions, reopened cases, linked records, and cancelled investigations use written rules. Reconcile the numerator to the eligible denominator rather than combining separately filtered reports. A changed population can move the percentage even when underlying operations did not change.

This measures open-cohort lateness at one snapshot, not investigation quality, age distribution, recurrence, severity, or closure throughput. Compare periods or targets prepared from the same rules, not an assumed universal benchmark. Product mix, sampling, schedule changes, reporting delay, exclusions, automation, and event granularity can move the value. Review absolute observations and reason-level evidence beside the percentage before deciding on corrective work.

No. This calculator applies disclosed arithmetic to values you supply; it is not an audit, quality release, maintenance authorization, supplier ruling, forecast, or process certification. A low overdue percentage cannot demonstrate adequate investigation quality, risk control, root cause, or corrective action. Retain source records, version the metric definition, test late-arriving events, and obtain accountable review before using the result for incentives, acceptance, or contractual action.