Direct answer
How can a buyer check whether production is being subcontracted?
Map the production route process by process. Ask the supplier to identify the company and location responsible for each critical step, then compare that statement with product-specific evidence, factory observations and production records.
- Identify the legal seller, manufacturer, exporter and payment beneficiary.
- List every major production step from material preparation through packing.
- Mark which steps are performed in-house and which are outsourced.
- Request evidence tied to the proposed product, not only a general factory tour.
- Confirm how subcontractors receive specifications and how returned work is checked.
- Require notice before a critical process, factory or subcontractor changes.
A buyer does not need to reject every outsourced process. The practical goal is to make the production route visible and control the parts that affect product performance, compliance or repeatability.
1. Separate the commercial and production roles
One order can involve several entities. Record their roles before deciding whether a supplier's factory claim matches the proposed production route.
Scroll the table sideways to compare all columns.
| Role | Question to answer | Useful evidence |
|---|---|---|
| Contracting seller | Who signs the order and carries the commercial obligation? | Quotation, contract and company registration |
| Manufacturer | Which entity and location make the product? | Product-specific process evidence and factory address |
| Subcontractor | Who performs an outside process that affects the product? | Process map, work instruction and incoming or return check |
| Exporter | Who appears on export documents? | Commercial and export-document alignment |
| Payment beneficiary | Who receives funds and why? | Account name and documented relationship |
2. Build a product-specific process map
Ask where each step will occur for the intended order. A factory may own relevant equipment but still outsource the work because of capacity, tooling, material or schedule constraints.
- Material purchase and incoming verification
- Primary forming, machining, converting or assembly
- Heat treatment, coating, finishing or another special process
- In-process and final checks
- Packaging, labeling and shipment preparation
3. Look for evidence that answers the routing question
No single document proves the complete production route. Use several consistent records and keep the conclusion limited to what was actually checked.
- Equipment and work areas connected to the proposed process
- Work instructions, inspection records or traveler documents within the agreed disclosure scope
- Material, work-in-process and finished-goods movement
- Outside-processing purchase, dispatch or return records where available
- Supplier explanation for any difference between sample and production routing
- Photo or live visual evidence tied to location, date and product reference
4. Evaluate how outsourced work is controlled
A disclosed subcontractor can be part of a controlled supply route. The buyer should understand how requirements are transferred, how changes are approved and how work is checked before it returns to the main supplier.
- Approved supplier or subcontractor selection method
- Specification, drawing and revision sent with the work
- Material identity and lot traceability across locations
- Inspection or test performed after the outside process
- Nonconformance and corrective-action route
- Notification and reapproval trigger for subcontractor changes
5. Recheck the route when the order changes
A sample can be made through one route and a volume order through another. Reconfirm the factory, critical processes and subcontractors when volume, tooling, timing or material availability changes the production plan.
Practical answers
Frequently asked questions
- Is subcontracting always a reason to reject a supplier?
- No. Many industrial supply routes use qualified outside processes. The buyer should know which process is outsourced, who performs it, how it is controlled and whether changes require approval.
- Can a factory visit prove that no production is outsourced?
- No. A visit can show equipment, work areas and records available within its scope and date. It cannot prove that every process for every future order will remain in-house.
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