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Error and Rework Rate
The percentage of completed work items affected by a defined error, correction, or rework event.
Business question
What share of completed work items required correction or rework under the agreed definition?
Formula
Error and rework rate = (completed work items affected by at least one defined error or rework event ÷ completed work items) × 100.
Calculation notes
Define whether the numerator counts affected items or every error event. Use the same unit in numerator and denominator.
Edge-case guidance
If no work items were completed, report the measure as not available. Record repeat corrections consistently and avoid counting one item twice unless event rate is intended.
Required data
| Input | Type | Status | Available source hints |
|---|---|---|---|
| Affected completed itemsCompleted items with at least one event meeting the error or rework definition. | Number | Required | Project management system · Excel · Manual records |
| Completed work itemsCompleted items in the same process and reporting scope. | Number | Required | Project management system · Excel · Manual records |
Interpretation
Use the measure to identify quality loss and process friction, then investigate error type, source, severity, and downstream impact.
Caution
The result depends on what teams record as an error or rework. A rising rate can also reflect improved detection and reporting discipline.
Implementation recommendation
Create a short error taxonomy and capture root cause or stage so the rate leads to specific process improvements.
Target guidance
Set the first target from a comparable historical baseline for error and rework rate, then adjust it for strategy, capacity, seasonality, data quality, and relevant market or regulatory context. Review the direction with the accountable business owner rather than treating any external benchmark as universal.