Switching suppliers is not swapping one for a lower quote; it is replacing a supply chain that is already running. First decide whether to negotiate or to switch; then take stock of what you own; then run trial orders in parallel.
1. Four signals: what to fix and what to replace
| Signal | Negotiate (still fixable) | Switch (cannot be fixed) |
|---|---|---|
| Quality | Occasional defects, minor cosmetic flaws | The same problem appears a second time; raised in writing and still recurring after rework |
| Lead time | Tight peak-season scheduling, but flagged in advance | Two missed promises in a row with no advance notice |
| Price | Raw material, exchange rate or order volume has changed | Persistently high for the same material, same process, same volume, with no movement after negotiation |
| Communication | Slow replies, but things still get done | Spec changes and incident handling are verbal only, never in writing, or there is no reply at all |
The hard test: the same problem happens a second time, you have already raised it once in writing, and what comes back is still a verbal assurance — that is a switch. The first time it happens, negotiate.
A communication failure can often be tested by changing the contact person first; changing people does nothing for failures in quality, lead time or price.
2. Before you switch, lock down the two things easiest to lose
Moulds and certifications are the easiest things to lose — they are not in your order files, but in the other party's factory and on their certificates.
- Moulds: the mould list (number, quantity, cavity count, photos), who paid the mould cost, which factory holds them, and whether they can be moved out. Whoever paid the mould cost owns the mould; without payment records, your claim in an ownership discussion is verbal only.
- Certifications: the certificate holder, the models covered, the validity period, and who owns the test reports. A certificate belongs to the holder, not to the product — it becomes void when you change factories.
Check three more while you are at it: the authoritative version of the drawing / spec sheet, packaging materials (who paid the plate cost, who owns the leftovers), and orders in production plus inventory (three separate lists: material committed, finished goods, goods on the water).
If you cannot get a clear account of these, do not switch. Switching means redoing the moulds and certifications from scratch.
3. Run trial orders in parallel, without alerting the old supplier
A switch is not "stop one, start another"; it is running two lines in parallel for a stretch.
- Trial order first, volume later. A trial order can be below the published MOQ for that model; specification-based samples and the trial order can be negotiated together.
- Do not alert the old supplier: do not announce it, do not cut current orders, do not name the new factory; and do not give the new factory the old supplier's name or your annual purchase volume — a stated volume will be used as the benchmark for their pricing.
- Compare the same thing: material grade, process route and the key-dimension list must be aligned before you compare. Quotes for different materials or processes are not comparable.
- The first thing to do when a trial order arrives is measure the outer carton, not look at the product — colour deviation and carton specifications are the two items most likely to be rejected, and both only show up in bulk.
4. The one test that settles it: if the cost of tolerating can be calculated, switch
Most people count only the trial order and the moulds when costing a switch, and miss three items: redoing certifications, defects during the first batch's ramp-up, and your own time managing two lines.
- Switch: the cost of tolerating can be put into numbers — how much each batch of rework costs, how many customers each delay loses.
- Negotiate first: the pain of tolerating is only "annoying", with no number attached.
- Do not switch: the new supplier has not been proven on the step where the old supplier failed — switching only moves the same risk elsewhere and lets it happen again.
- Usually more expensive: any one of three items is stuck — moulds, certifications, or customer designation.
The test is not "how bad they are", but "whether the new one has already been proven once on the point that hurts you most".