A customer reports a nonconforming part. The first question that follows is always the same: How many other parts are affected? If it takes three days of searching through file cabinets, Excel spreadsheets, and paper tracking sheets to find the answer, the problem is no longer just one of quality. It becomes a sales, logistics, and sometimes regulatory issue.
Visit industrial traceability is specifically designed to provide a quick and accurate answer to this question. It makes it possible to track, for each part or batch, where it came from, how it was manufactured and inspected, and where it went. In the aerospace, medical, and automotive industries, it determines market access. Across all sectors, it determines the true cost of non-compliance.
This article provides an overview of what traceability in production entails, the data that needs to be recorded, the appropriate level of detail, and the method for building a reliable system without adding to the workload in the workshops.
What is industrial traceability?
Industrial traceability is the ability to reconstruct a product’s complete history throughout its life cycle: materials and components used, manufacturing steps, operators, machines, inspections performed, packaging, and shipping.
The ISO 9001 standard explicitly requires this in clause 8.5.2, «Identification and Traceability.» The organization must identify outputs and, when traceability is required, ensure their unique identification and retain the necessary documented information.
Forward traceability and backward traceability
There are two ways to interpret this, and an effective system must address both.
- Upstream traceability traces the finished part back to its origins. It answers the question: Using what material, on what machine, by which operator, with what program, and using what measuring instrument was this part produced? It is the tool for root cause analysis.
- Backward traceability traces from a suspect item to all affected products. For example: a defective batch of bars, or a tool that broke at 2:00 p.m. It answers the question: Which parts, which batches, and which customers are affected? This tool defines the scope of a sorting or recall.
A company that only has control over backward traceability can explain a defect. It cannot measure the extent of the defect, and that is often where the cost lies.
Batch- or Item-Level Traceability: Which Level Should You Choose?
Granularity is the fundamental decision in a traceability project.
| Level | Principle | Suitable for | Limit |
|---|---|---|---|
| In the lot | All items in a batch share the same history | Large production runs, low-criticality parts | If there is any doubt, the entire batch is considered suspect |
| At the sublot or production order level | The batch is divided by team, by tool change, or by container | Bar turning, mass production machining | Requires a clear cutting process |
| Per unit (serial number) | Each piece has its own story | Aeronautics, implants, safety components | Systematic labeling and data entry |
The rule is simple: the finer the granularity, the smaller the scope of a potential recall. The appropriate level depends on the part’s criticality, the customer’s requirements, and the cost of sorting.
Why Traceability Has Become Essential
Meeting regulatory and customer requirements
Each industry adds its own requirements to the ISO 9001 standard:
- Aeronautics : EN 9100 strengthens the requirements for identification and traceability. EN 9102 provides a framework for the first article (FAI), whose documentation is based on comprehensive manufacturing and inspection data.
- Medical : ISO 13485 devotes a section to traceability (§7.5.9), with stricter requirements for implantable devices. In Europe, the Medical Device Regulation also requires the unique identification of devices (IUD/UDI).
- Automotive : IATF 16949 supplements ISO 9001 with risk-based traceability requirements. These requirements focus, in particular, on safety and regulatory characteristics.
Beyond industry standards, clients’ specifications often require a specific level of traceability. They verify this during supplier audits.
Limiting the Cost of Noncompliance
Without usable traceability, the instinctive response to a defect is to take a broad approach: hold up the entire inventory, the entire production week, and sometimes all shipments to a particular customer. With detailed traceability, we can precisely isolate the parts produced between two compliant inspections, on the machine in question, using the suspect component.
The difference is measured in sorted items, lost hours, avoided penalties, and preserved customer trust.
Passing an audit without digging through the archives
An auditor requesting the complete history of a serial number won't wait three days. Centralized traceability makes it possible to generate the information in just a few minutes:
- manufacturing data;
- the test results;
- the calibration status of the instruments used;
- the associated nonconformities.
Understanding and Improving the Process
Traceability is not just a safeguard in case of a problem. When production data is linked to inspection results, it becomes a tool for improvement. It allows you to correlate a deviation with a batch of material, a tool change, a shift, or a machine, and to address the root cause rather than the symptom.
What data should be tracked in production?
Effective traceability answers six questions for each part or batch:
- What : reference number, plan index, lot number, or serial number.
- With what : batches of materials and components, along with their supplier certificates and the results of the acceptance inspection.
- Where and how : machine, CNC program, tooling, work plan, and completed step.
- Who : an operator or setter at each stage.
- When : Time stamp for each operation, adjustment, tool change, and inspection.
- What was the result? : measurements taken, measuring instrument used and its calibration status, compliance decisions, nonconformities, and exemptions.
The last point is often the weak link. Many companies track physical flows but store the inspection results elsewhere, or on paper. Yet it is precisely this data that proves compliance.
The 5 Steps to Implementing a Robust Industrial Traceability System
1. Define the scope and level of detail
Start with customer and regulatory requirements, then consider the criticality of the parts. Not all parts require traceability down to the individual part level. Safety-critical parts, however, cannot do without it. Formalize the rules for creating batches: by shift, by tool change, or by material batch. These rules determine the size of any sorting operation.
2. Uniquely identify each part or batch
The identifier must physically and unambiguously track the product:
- barcode labels on the containers;
- DataMatrix codes engraved or printed on critical parts;
- RFID when the situation warrants it.
A scanner-readable identifier prevents transcription errors, which are the primary cause of traceability issues.
3. Automate data collection
Every instance of manual data entry carries the risk of omissions or errors. Data must be reported as close to the source as possible:
- connection to machines and measuring equipment;
- scan at each step;
- Simple operator interfaces that can be used on a tablet at the workstation;
- Automatic data exchange with the ERP and MES systems for production orders and shipments.
4. Consolidate into a single database
Excel files for each workstation, paper records, and an ERP system that only tracks shipped batches: this setup creates silos. It makes downstream traceability nearly impossible. A single database, accessible from any workstation, is essential for retrieving a complete history with a single search.
5. Leveraging Data: Research, Alerts, Reports
Traceability that merely records data remains nothing more than an archive. It becomes valuable when it is used on a daily basis:
- Instant search by batch or serial number;
- automatically generated traceability reports for audits and ISP records;
- alerts in the event of a missing step or a non-compliant check;
- dashboards for managing production.
Common Mistakes
- Draw without connecting the controls. We know where the piece went, but we don't know if it was measured or what was used to measure it.
- Batches that are too large. A batch covering one week of production turns even the smallest defect into a massive sorting operation.
- Ignore the status of the measuring instruments. A measurement taken with an uncalibrated instrument proves nothing. Without a link between traceability and metrology management, it is impossible to know which parts were inspected using that instrument.
- Increase the number of manual entries. Every copy is an opportunity for a break.
- Never test the system. Regularly simulate a recall on an actual batch. If the response takes more than an hour, the system won't be ready when it's actually needed.
Linking Traceability, Quality Control, and Process Management
Traceability is most valuable when it is not isolated from the rest of the system. A properly traced part must be linkable to:
- its production controls (SPC, or automatic machine corrections for APC);
- the incoming quality control (IQC) of its components;
- the condition of the instruments used to measure it (METRO).
It is this link between physical flows and quality data that makes it possible to move from traceability «for auditing purposes» to traceability that helps improve production.
The TRACE module from Ellistat
The TRACE module The Ellistat quality management system centralizes the history of each batch and each part, from manufacturing through quality control to shipping. Specifically, it allows you to:
- record lot and batch numbers to ensure complete traceability upstream and downstream;
- track the work sequences: each step, the operator involved, and the machine used, along with the progress of work orders in real time;
- automatically link process data, inspection results, and nonconformities to the parts produced;
- Generate customizable traceability reports to respond quickly to audits.
TRACE is integrated with the other modules in the suite (APC, SPC, IQC, METRO) and communicates with the ERP and MES via API. The solution is fully web-based, available as SaaS or on-premises, and accessible from a PC, tablet, or smartphone.
Conclusion
A industrial traceability Reliability isn't just about labeling batches. It's based on four decisions:
- a level of detail appropriate to the criticality of the parts;
- a unique identifier;
- automated collection;
- a single database that links physical flows and inspection results.
When properly designed, it reduces the scope of recalls, simplifies audits, and serves as a source of process improvement. The best place to start is with a simple test: choose a batch shipped last month and time how long it takes to reconstruct its entire history.
FAQ
What is the difference between upstream and downstream traceability?
Upstream traceability traces a finished product back to its origins (materials, machinery, operators, inspections) to analyze the cause of an issue. Downstream traceability starts with a suspect item to identify all affected products and customers, in order to define the scope of a sorting or recall.
Is traceability required?
ISO 9001 requires it when traceability is mandated by the customer, regulations, or the organization itself. It is, in fact, essential in the aerospace industry (EN 9100), the medical industry (ISO 13485, unique device identification), and the automotive industry (IATF 16949), as well as in many customer specifications.
Should we trace by piece or by batch?
It depends on the criticality of the part and the customer’s requirements. Part-level traceability is the standard for safety-critical parts and implants. For large production runs, dividing the batch into sub-lots (by shift or tool change) often offers the best balance between effort and the scope of a recall.
Is an ERP system sufficient to ensure traceability?
An ERP system typically tracks incoming and outgoing batches, but rarely records the details of the manufacturing process and inspections—such as the machine, settings, measurements, and instruments used. A dedicated traceability solution, connected to the ERP system, fills this gap.
How can I tell if my traceability system is reliable?
Simulate a recall on an actual batch. You need to quickly identify the origin of the raw materials, the manufacturing steps, the inspection results, and the list of customers who received the product. If any of this information is missing or requires hours of research, that is the issue that needs to be addressed first.
Want to know how long it takes you today to reconstruct a batch’s history? Our teams will show you, using one of your actual cases, how TRACE retrieves a part’s complete history. Request a demo.