A failed inspection is not the accident. It is the system working: something was caught before it left the country, which is the whole point of inspecting. The accident happens in the hour afterwards, when a decision has to be taken quickly, the container is booked, and the only proposal on the table comes from the party with the strongest interest in shipping. « We will rework it » sounds like a remedy. It is a category, and it holds at least four very different operations.
What « we will rework it » actually covers
The four operations have different costs, different risks and different consequences for what you receive. They also have very different implications for the lot's identity: two of them leave you with the product you ordered, one leaves you with a repaired product, and one leaves you with a lot whose composition nobody can reconstruct. Asking which one is meant is not pedantry — it is the only question that changes what arrives.
| What you are told | What it usually means | What to require |
|---|---|---|
| « We will rework it » | An operation on the defective pieces themselves: trimming, regluing, repainting, reassembling. The product is repaired rather than remade, and the repair may itself be visible | A written description of the operation, a sample of a repaired piece for approval, and the right to refuse a repair that shows |
| « We will sort it » | Every piece is looked at and the bad ones are set aside. Nothing is repaired; the quantity falls, and the shortfall has to be produced or the shipment is short | Who sorts, against which criteria, and what the quantity will be afterwards — asked before the sort rather than when the cartons are counted |
| « We will remake the lot » | New production, which is the cleanest answer and the one that moves the date. A factory offering it is usually telling you the defect is in its process and it knows it | The new date in writing, and confirmation that the rejected pieces are physically separated — not stored next to the good ones |
| « We will replace the bad pieces » | Pieces come from somewhere else: another lot, stock, another customer's cancelled order. The lot becomes a mixture, and its traceability ends there | Where the replacement pieces come from, and whether they were made to the same specification and the same approved sample. This is the one to be slowest about accepting |
The people who produced it cannot be the ones who clear it
After a rework, someone has to establish that the lot is now acceptable. The factory will offer to do it, and the offer is made in good faith: its own people know the product, they are on site, and it costs nothing. It is also the one arrangement guaranteed to produce the answer the factory needs. The operators re-checking are the operators who made the defect, judging their own repair, under pressure from a date, in a building where the lot not shipping is everybody's problem. Nobody in that chain is dishonest. The structure simply has no room for a negative result.
Piece-by-piece sorting is not free
Sorting looks like the cheap answer because nobody invoices it. It is the operation that generates the most hidden cost in the whole episode, and most of that cost lands on you later rather than on the factory now.
- Time taken from the line. The people sorting are the people who should be producing, often your own next order. A sort that saves a date today is frequently the reason the following date slips.
- Unpacking and repacking. Finished goods are already in their retail boxes, in cartons, on pallets. Handling them twice damages a share of them, and the packaging itself does not survive being opened and closed as often as people assume.
- Mixing. Sorted and unsorted cartons sit in the same area, with the same markings, for several days. The single most common outcome of a hurried sort is good and bad product in the same pallet, and nobody able to say which carton was done.
- Eye fatigue. A person looking for one defect in thousands of identical pieces, for hours, stops seeing it. The first cartons are sorted well and the last ones are sorted in name only, which is why the shortfall always appears at the customer end of the lot.
- The defect a sort cannot catch. Sorting works for what is visible. For a function, a dimension inside a tolerance, an assembly torque or anything that requires a test, a visual sort changes nothing and gives false reassurance.
A reworked lot is a new lot
The original inspection drew its sample from a population that no longer exists. After a rework, the pieces have been handled, some have been repaired, some have been removed and some may have come from elsewhere — and the repair operation itself can create its own defect, which nobody was looking for because it did not exist before. Clearing the lot on the strength of the first inspection, or on a re-check limited to the pieces that had been rejected, is checking the wrong population. The lot has to be re-sampled as a lot, from the whole of it, with the same method as the first time and a written trace of what was done between the two.
That written trace is short and it is the document that settles every later argument: what the defect was, how many pieces were concerned, which operation was performed, by whom, on which dates, what happened to the rejected pieces, and what the final quantity is. Ask for it as a condition of the re-inspection rather than as a formality afterwards. A factory that can produce it has controlled its rework; a factory that cannot has done something to your product that neither of you can now describe.
Stopping rework from becoming the method
A rework that works teaches the factory something you did not intend to teach: that producing and fixing afterwards is an acceptable way to hold a date. Repeated three or four times, it stops being an incident and becomes the process — and the rework cost quietly enters the price of every subsequent order, paid by you without anyone having discussed it. The correction is not to refuse rework, which is sometimes the right answer. It is to make it expensive in the only currency a factory counts: visibility, traceability and repetition. Authorised in writing each time, described, counted, with the re-inspection cost allocated in advance in the purchase order, and with the root cause asked for before the next order is placed. A rework that is recorded and discussed happens once. A rework that is tolerated silently happens every time.
Decide the rule before you need it, and write it into the purchase order: a reworked lot is re-inspected in full, by the same third party as the first time, at the supplier's cost, and does not ship on the strength of an internal check. Agreed in advance it is a clause nobody argues with. Proposed on the day the container is booked, it is a demand, and you will lose it.