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A CAPA that ends with retraining may leave the mechanism of failure untouched. Begin by separating the immediate correction, the cause investigation and the action intended to prevent recurrence.
Investigate the failure mechanism
Construct an event timeline using records, system behaviour and interviews. Ask what made the failure possible and what prevented detection. Avoid assigning a cause solely because a person made the last visible error; evaluate workload, unclear ownership and system design.
Distinguish correction from prevention
For repeated missed laboratory shipments, replacing one courier label corrects a shipment. Investigation may reveal that weekend collections have no confirmed handoff. A preventive action could introduce an acknowledged booking and backup route, then test the next relevant collections.
CAPA action checks
- Define action owners, due dates and expected evidence.
- Choose effectiveness measures before closing implementation tasks.
- Examine similar workflows for the same failure mechanism.
Separate implementation and effectiveness
Accept implementation only when the promised change exists. Accept effectiveness after a suitable observation period or targeted challenge shows the risk has been reduced. Record limitations, residual risk and any decision to reopen the CAPA when failures recur. Keep implementation closure and effectiveness review dates distinct; an action not yet exposed to the relevant conditions cannot support a confident effectiveness conclusion.
Frequently asked questions
- Is root cause always a single cause?
- No. Several interacting process and system conditions may explain the event.
- Does completed training prove effectiveness?
- It proves a training activity occurred; process performance needs separate evidence.