Traceability and mock recall: how to test your traceability
What traceability requires in ISO 9001 and IATF 16949, lot and serial levels, forward and backward tracing, and how to run a mock recall exercise with a checklist of the records to trace.
Updated 2026-10-28
What the standards ask for
ISO 9001 clause 8.5.2 asks for identification of outputs and, where traceability is a requirement, for controlling and keeping the unique identification of the outputs. IATF 16949 adds clause 8.5.2.1: analyse the internal, customer and regulatory traceability requirements for every product, define the traceability plans from that analysis and keep the records for the required period. Customer-specific requirements and regulations (for example for safety parts) set the level in the end.
Decide the level of traceability
| Level | What is identified | Typical use |
|---|---|---|
| Lot or batch | All parts made from one material lot in one run and period | Most series parts |
| Shift or day | Parts made in a defined period | Continuous processes, bulk material |
| Serial number | Every single part with its own number or code | Safety parts, electronics, customer requirement |
The finer the level, the smaller the recall: a lot of 500 parts in the field is a very different problem from a month of production.
Backward and forward tracing
- Backward: from a finished part or a complaint to the production order, the process records and parameters, the machine and tool, the operator or shift, the inspection results, the gauges used and the raw material lot with its supplier certificate.
- Forward: from a suspect raw material lot or process event to every part made with it, where they are now (stock, work in progress, shipped) and which customers and orders received them.
Run a mock recall
The only way to know that traceability works is to test it. Choose a finished lot or a raw material lot, set a clock, and trace both directions. Run it at least once a year, after every system change, and before a customer or certification audit.
- Define the scenario: for example “the material lot 4711 has a hardness problem” or “the customer found a defect in the part with the label X”.
- Trace backward and forward with the records only, without asking people to remember.
- Quantify: how many parts were made, how many are in stock, in process and at customers, and which orders.
- Measure: the time needed and the share of the quantity that you could account for. Agree a target in advance; many companies aim for a few hours and for 100 % of the quantity.
- Record the gaps as findings with owners in the CAPA and NCR register and verify the fix with the next exercise.
Checklist of the records to trace
| Step | What must be linked |
|---|---|
| Incoming material | Supplier, delivery note, material lot, certificate, incoming inspection |
| Production order | Material lot to order, quantity, date |
| Process | Machine, tool or fixture, parameters, operator or shift, set-up approval |
| Inspection | Measured values or results, gauge identification, nonconformance records |
| Rework and sorting | Original lot to reworked lot, who and when |
| Packing and shipping | Label and lot, delivery note, customer, shipped quantity |
Where traceability usually breaks
- Lots are mixed or split at rework or sorting, and the new lot has no link to the old one.
- The raw material lot is not recorded on the production order.
- Labels are replaced or removed during repacking.
- Records exist but in five systems that nobody can search in time.
- A sub-supplier delivers without lot identification, so the chain breaks at the beginning (check it in the supplier assessment).
Describe the traceability of each process in its turtle diagram and check it in the internal audit.