An internal audit keeps finding the same observation. How would you investigate why controls fail?

Why

EU GMP Chapter 9 requires self inspections to be recorded with proposals for corrective measures and the actions taken, and ICH Q7 says agreed corrective actions should be completed in a timely and effective manner. A repeat observation shows the effective part failed. Start by laying out every occurrence and the response to each.

Often the first response was to retrain, the second was to rewrite the SOP, and neither changed the conditions. Then test each response. Was it actually implemented, did anyone check it worked, and did it target the mechanism?

Ask what has stayed constant across occurrences. A line that keeps failing calibration overdue checks might share one scheduler with too many instruments and no backup. A logbook gap might come from a logbook stored where nobody passes.

The investigation also has to look at ownership, since findings that belong to several departments tend to belong to none. ICH Q10 asks management review to look at audit results and allocate resources, so a repeat finding is a legitimate management review topic. The outcome should be a CAPA whose effectiveness check is the absence of the finding at the next audit plus a leading indicator in between.

The limit is that auditors sample, so a finding that disappears might simply not have been sampled.