Arguing about defects after they happen is already too late
Writing a quality agreement with a Chinese factory - from defect thresholds to liability, rework costs and the set-off clause

Hello, this is GreenFrog Seoul.

"180 units out of 3,000 are defective. What are you going to do about it?"
"By our standard they are fine. That rate is normal."
"Then what exactly is that standard?"
"...It is how the industry works."

The moment that conversation starts, you have already lost. The goods are built, the balance payment has gone out or is about to, your sales date is days away, and above all there is no document in which both sides agreed on what "defective" means. In that position, no matter how carefully you assemble your inspection report, the factory can answer "that is your standard." And it will.

Today's document is the quality agreement, also written as a QA agreement, and usually exchanged with Chinese factories as 质量保证协议. It is the document you sign before production starts: it fixes defect thresholds as numbers, sorts defects into grades, and writes down in advance who bears what, and how, when a lot fails.

How to run the inspection itself was covered in Episode 21 on quality management systems and Episode 100 on pre-shipment inspection, and negotiating after something has already gone wrong was covered in Episode 36 on claims and dispute resolution. Today we are one step earlier than all of that. Not inspection procedure, not negotiating tactics — only which clauses go into the agreement, and in what words.

Quality disputes are won or lost not after the defects appear but at the table where the pre-production document was written. On a deal with numbers and grades in an agreement, 180 defects become "a given number of contract breaches." On a deal without one, they are just a difference of opinion.

1. We already have a contract and a PO — why another document?

This is the first question that comes up in consultations. You signed an OEM contract and you put a line of AQL on the purchase order, so why build one more document? The answer lies in the fact that the three documents do different jobs.

You might ask why this cannot all go into the contract. It can. The catch is that a contract is a document the owners sign and then file in a safe, which means nobody on the floor ever reads it. A quality agreement is a different animal. It is a working document that the factory's QC manager and your inspector actually spread out on a table to settle whether something is a Major or not. So you keep it separate, and you keep a copy at the inspection site.

Deal structure and legal clauses in general were covered in Episode 12 on OEM and ODM contracts, so I will not repeat them here.

What typically happens without an agreement

There is a set of failures I run into over and over in consultations. The cause always sits in the same place: the standard was never written down as a number.

The last two lines of that table sting the most. Even when the factory admits fault, an admission is worthless if you have no mechanism to collect. Half of a quality agreement is judgment criteria; the other half is that collection mechanism.

2. Fix the defect threshold as a number — AQL and PPM

I often see agreements that say "defect rate within 3%." It looks clear enough, and in practice it barely works. Short of 100% inspection there is no way to verify 3%, and nothing says which grade of defect gets counted.

Two standards get used on the ground. One is AQL, which drives the pass/fail verdict on a sampling inspection; the other is PPM, which tracks delivered quality over time. They are different tools, so you do not pick one — you use both, each in its place.

Let me clear up one thing that is easy to get wrong. AQL does not mean "we permit this many defects." It is a statistical threshold for judging a lot by sampling. A lot that passes at AQL 2.5 does not contain 2.5% defects, and it certainly does not mean the factory is absolved up to 2.5% defective. Put only AQL in the agreement and leave the PPM target out, and the factory will run the argument that "we passed AQL, so we met our quality obligation." That is why you write the two lines side by side.

Sample clause.
"Pre-shipment inspection shall be conducted under ISO 2859-1 Normal Inspection Level II, at Critical 0 / Major 2.5 / Minor 4.0. Acceptance at AQL means only that the lot may be released for shipment and shall not relieve the Supplier of its quality warranty obligations. The Supplier shall maintain a rolling twelve-month average of 3,000 PPM or below, and shall submit a corrective action plan within 30 days of any exceedance."

Where to set the PPM target depends on the product. The bands below are what I see most often in practice — treat them only as a starting point for negotiation.

3. Make the defect grades specific to your product

The three-tier Critical / Major / Minor split appears in every quality agreement. The problem is that most of them copy the textbook definitions straight across. If all it says is "a defect that materially affects product function," you will still be fighting on the floor over an 8mm scratch.

Grade definitions only become useful once you rewrite them using the actual defect list for your product. Here is what that looks like for a household plastics item.

It pays to go one step further. Even wording like "scratch of 3mm or more on the front visible face" leaves room to argue once you are holding the physical unit. What do you call an 8mm mark that is extremely faint? There is a limit to the resolution of a written standard, and what fills that gap is the limit sample and the defect catalog.

Limit samples

This means both sides jointly picking physical units that sit on the borderline between pass and fail, and sealing them. The process is simple. From the real defects that come out of the first production run, pick the borderline ones and sort them into "this passes" and "this fails." Label each, have both sides sign, seal them, photograph them and put the photos in an annex to the agreement. The physical units are split into two sets, one held by the factory and one by you.

Two or three units per grade is plenty. Validity is usually set at around twelve months and then renewed, though materials that shift color under UV or humidity need a shorter cycle.

Defect catalog

Defects you cannot keep as physical samples get documented photographically — food-contact items and bulky products fall into this bucket. Give each photo one line each for the defect name, grade, the process it originates in, and the judgment criterion, then build it into a PDF and attach it to the agreement as an annex.

The biggest benefit is that verdicts stay stable even when the factory's inspector changes. Turnover among QC staff at Chinese factories is high, and a new hire does not know the old standards. With a catalog, the handover happens on paper.

4. Decide who inspects and whose verdict is final

However finely you write the criteria, if it does not say who decides and whether that decision is final, you are back where you started. In a structure where the factory's own inspection alone releases the shipment, the numbers in your agreement are close to decorative.

The bottom row is the point. State explicitly that final authority on the pre-shipment inspection sits with the buyer. A few supporting clauses belong alongside it.

Guaranteed inspector access. Factories do genuinely put you off on the day with "today is difficult." Put in a line: "The Supplier shall permit the Buyer, or a third-party inspection body nominated by the Buyer, access to the factory for inspection upon three business days' notice." Securing a right of unannounced visit as well is better still.

A definition of inspection-ready. An inspector who arrives to find packing only 40% complete cannot perform an inspection. Write that "at the time of inspection, 100% of the ordered quantity shall be produced and at least 80% packed," and follow it with a line making the factory bear the cost of a return visit if the inspection is aborted for failing that condition. Attach a cost to an aborted inspection and readiness improves noticeably.

An objection procedure. The agreement only reads as fair if the factory also has a route to contest a verdict. Something like: "The Supplier may object in writing within two business days of notification of the inspection result, in which case the result of a re-inspection by a third-party inspection body agreed by both parties shall be final. The cost of re-inspection shall be borne by the Buyer if the verdict is reversed and by the Supplier if it is upheld." Tie the cost to the outcome and baseless objections all but disappear.

5. The four ways to handle a failed lot, and who pays

This is the part of the agreement where money actually moves. When a lot fails there are four options, each with its own timeline and its own paying party. This table should go into your agreement whole.

There is one more sentence you must include when writing this clause: the buyer decides which route is taken. Without it the factory will push option 3 every single time, because it costs the factory least. You do not want to be offered a 5% discount to paper over a seasonal product where 40% of the units have to be sorted out.

Sample clause.
"The method of handling a failed lot (100% sorting, rework, acceptance at a discount, or rejection and remake) shall be determined by the Buyer at its sole discretion, and the Supplier shall commence within two business days of being notified of the Buyer's decision. If the Supplier fails to commence within that period, the Buyer may engage a third party to perform the sorting or rework, at the Supplier's cost."

That second sentence matters especially. It gives you the ground to move yourself when the factory drags its feet. Without this clause, all you can do while the factory delays starting is wait.

How to calculate rework and sorting costs

Stop at "borne by the Supplier" and you will be arguing again when you invoice. Set out in advance, as a formula, how the amount is calculated.

Attach the rate card to the agreement as an annex and connect it from the body with "the rates in Annex B shall apply." An annual revision clause is worth adding alongside. Set up this way, you never have to re-explain the basis of your calculation when you send an invoice.

6. Latent defects and the warranty period

Some defects do not show up at inspection: weak adhesion, insufficient plating thickness, plastic degradation, battery capacity fade — anything that needs time to reveal itself. These are latent defects, or hidden defects.

This is where the factory's favorite defense comes from: "it passed inspection, so our responsibility is over." Without a warranty clause in the agreement, that argument is hard to rebut. So you write in an explicit sentence that separates inspection acceptance from quality warranty liability.

Sample clause.
"Acceptance at pre-shipment inspection covers only those items verifiable by visual examination and sampling, and shall not relieve the Supplier of liability for latent defects that could not have been detected by inspection. The Supplier warrants that the products will conform to the agreed specification and quality until the earlier of twelve months from delivery to the end consumer or eighteen months from the shipment date."

The common mistake in designing a warranty period is failing to fix the start date. Measured from the shipment date versus from consumer delivery, the two can genuinely be six months apart. For a product held in stock for half a year before it sells, twelve months from shipment is effectively meaningless. That is why the widely used approach, as in the example above, is to state both and apply whichever comes first.

One point deserves flagging. Where the warranty you owe your own customers and the warranty the factory owes you are different lengths, you absorb the difference. If your retail channel demands 24 months and your factory agreement gives you 12, every defect from month 13 onward is on your money. The warranty period in your agreement must be equal to or longer than the warranty you give downstream.

7. Sharing the cost of a market withdrawal or recall

This is the hardest clause to write and the easiest one to put off. It looks unlikely, so it becomes "let's deal with that later" — and when it does hit, the numbers are of a different order.

Recall costs grow independently of product cost, because channel retrieval, logistics, consumer notification, replacement or refund, disposal and regulatory response all pile on top. Recall 5,000 units of a product costing 10,000 won each and the product cost is 50 million won while the total can pass 150 million.

Three things go into the agreement. First, authority to decide on a recall sits with the buyer — waiting for the factory to agree slows your response, and slow response means larger damage. Second, cost allocation by line item, laid out as in the table above. Third, the procedure and deadline for determining cause. Liability turns on whether the cause was design or manufacturing, so write down how the third-party testing body gets selected and within how many days the result is due.

One more clause is worth adding on top: an insurance requirement. "The Supplier shall carry product liability insurance and provide a copy of the policy" — and Chinese factories of any size generally do carry it. Check the coverage limit and the territory. A surprising number of policies do not list Korea as a covered territory.

8. Liability caps and exclusions — the clause the factory will always ask for

By this point the agreement may look one-sided. In a real negotiation the factory asks for defensive clauses too, and the standard ones are a liability cap and a consequential loss waiver.

From the factory's chair this is reasonable. If taking a 100 million won order can mean paying out a billion when something goes wrong, they cannot do business at all. The question is where the cap sits.

Even with a cap, you must carve out exceptions. Standard practice excludes these three from the cap.

• Damage arising from willful misconduct or gross negligence
• Clear breaches of contract such as unauthorized specification changes, use of unapproved materials, or unauthorized subcontracting
• Third-party bodily injury and product liability damages

The third is the critical one. If a matter where somebody was injured runs into a cap of "up to 100% of the order value," the cap has made itself meaningless. Most factories accept this exception — they have no intention of causing accidents on purpose either.

The consequential loss waiver is usually one you end up accepting. Pinning items like lost sales or brand damage on a factory is realistically very hard in international trade. Instead, define direct loss broadly. Enumerate sorting costs, rework costs, retrieval logistics, disposal, re-inspection fees and channel penalties as included in direct loss, and you sharply reduce what there is to argue about later.

9. Claim deadlines and evidence requirements

You can write an excellent agreement and still recover nothing because you missed a deadline. The claim clause protects you and constrains you at the same time.

Set the deadlines too short and you are the one who loses. Checking a full container within 30 days is realistically hard, and harder still when goods are split across several channels. I suggest negotiating toward 30 days for appearance items and around 90 days for functional ones.

Evidence requirements matter as much as deadlines. "Insufficient evidence" is the card factories reach for most often when refusing a claim, so pin down in the agreement, as a list, exactly what submission makes a claim valid.

• Photographs of the defective units — full view, close-up of the defect, and the lot number and production date marking
• Defect quantity and inspection method (100% check or sampling; if sampling, the sample size)
• The basis of the defect rate calculation — units inspected against units defective
• Photographs of the packaging condition (to distinguish transit damage)
• A third-party test report (for functional and material property defects only)
• Supporting cost documents when billing (labor breakdowns, tax invoices, freight bills)

One more line is worth adding: "The Supplier shall respond in writing within seven business days of receipt of the above evidence, stating whether the claim is accepted and its reasons. Failure to respond within that period shall be deemed acceptance of the claim." It is a clause that gives silence an effect, and it works remarkably well against the strategy of stalling by not replying.

10. The set-off clause — where you build the mechanism to actually collect

If I had to pick the single most effective clause in a quality agreement, I would pick set-off. Everything above ends with "borne by the Supplier," and saying you will bear a cost is an entirely different thing from money actually arriving.

Sending a damages invoice to a Chinese factory and collecting cash against it is extremely hard. Go to litigation or arbitration and the cost and time routinely exceed the amount at stake. So practice uses a different route: taking it out of money you are still holding.

Sample clause.
"The Buyer may set off and deduct any costs and damages borne by the Supplier under this Agreement against any and all sums payable to the Supplier, including the balance payment on the relevant order and any unpaid sums on other orders. The Buyer shall notify the Supplier of the deduction in writing, and the Supplier shall be deemed to have approved it if no objection is raised within five business days of receipt of that notice."

Do not skip the phrase in the middle: including unpaid sums on other orders. Even if the balance on the problem order has already gone out, you can deduct from another order in progress. Without that phrase, the set-off clause loses more than half its force.

For set-off to work you also have to look at your payment structure. In a structure where the full balance is wired before shipment, there is simply no money left to deduct from. Which is why the 30/60/10 structure recommended in Episode 102 on purchase orders and production tracking holds up here too. Split into 60% after inspection pass and 10% after receipt of shipping documents, that final 10% stays available as claim-response funds.

The difference in character between the top two rows and the bottom two is obvious. Recovery is only easy while you are still holding the money. That is why the set-off clause and the payment structure have to be designed as one package.

11. Escalation for repeat breaches

One defect is an incident; the same defect three times is a management failure. Define a staged response in the agreement and you do not have to negotiate from scratch every time.

The tightened inspection at Stage 2 is a genuinely practical device. ISO 2859-1 defines three levels — normal, tightened and reduced — and switching to tightened lowers the acceptance number at the same sample size, so the verdict gets stricter. Push the inspection cost onto the factory as well and the factory has a clear incentive to improve.

An 8D report is an eight-step problem-solving format. It requires the factory to fill in the problem description, containment action, root cause, corrective action, verification of effectiveness, prevention of recurrence and read-across — which stops them closing the matter with "we will be more careful next time." Most factories already have the form, so you just have to require it. If they say they do not, send them one.

The thing most often missed in a Stage 4 termination clause is the return of tooling and materials. Declaring termination is no use if you cannot get your molds out, because you cannot move to another factory. Include the sentence "within fifteen days of the termination notice, the Supplier shall deliver tooling, jigs, unused buyer-supplied materials and work in progress to a location designated by the Buyer" inside the clause.

12. Clauses factories push back on, and where to land

Send an agreement containing everything above and the factory will snag on a few points without fail. Decide before you go in where you will concede and where you will hold.

Let me pick out the two marked as non-negotiable. Critical AQL 0 is about people getting hurt, and the moment a number goes in you have a written record of having permitted that risk. The set-off clause is what keeps the whole agreement from being a statement of intent. Everything else you can adjust according to the relationship and your leverage.

13. Common mistakes

These come up again and again in quality agreement consultations.

• Stopping at the contract's one line — "quality shall meet the agreed standard" — and never producing a separate agreement
• Writing only AQL and no PPM target, allowing the "we passed AQL so we bear no liability" argument
• Leaving Critical, Major and Minor at textbook definitions instead of making them specific to your product's defect list
• Not making limit samples, so borderline verdicts get argued verbally every time
• Not stating final authority for the pre-shipment inspection, so the factory's own inspection releases the shipment
• Leaving the choice of failed-lot route to "discussion," which always ends in accepting a discount
• Not attaching the rework and sorting cost formula and rate card as an annex
• Having no latent defect clause, so you cannot rebut "it passed inspection, so we are done"
• Not fixing the warranty start date, so shipment date and consumer delivery date diverge
• Having a shorter factory warranty than the one you owe domestically, and absorbing the difference
• Applying the warranty time limit to safety defects as well
• Setting a liability cap while omitting the exceptions for willful misconduct, gross negligence and bodily injury
• Having no claim evidence requirements, so claims get refused as "insufficient evidence"
• Leaving out the set-off clause, so there is no way to collect even when the factory admits fault
• Producing the agreement after the contract is signed, handing the factory a reason to re-open unit price

14. Quality agreement checklist

Defining the standards

• AQL levels (Critical/Major/Minor) and the inspection standard (ISO 2859-1 level) are stated
• PPM target, measurement period and the corrective procedure on exceedance are included
• A sentence stating that AQL acceptance does not relieve quality warranty liability is included
• Defect grades are made specific using the actual defect list for the product
• Limit samples are made, signed and sealed by both sides, with photos attached as an annex
• A defect catalog is attached as an annex
• Color tolerance (ΔE) and dimensional tolerances are written as numbers

Inspection and verdicts

• Who performs each inspection stage (IQC, IPQC, FAI, OQC, PSI) is laid out in a table
• Final authority on the pre-shipment inspection is stated as sitting with the buyer
• A guaranteed factory access clause for inspectors is included
• Inspection-ready condition (production and packing completion rates) is defined, with return visit costs on failure
• The supplier's objection procedure is included, with re-inspection costs tied to the outcome

Failed lots and costs

• The four handling routes and who pays for each are in a table
• The choice of route is stated as sitting with the buyer
• The right to engage a third party and bill the supplier when the supplier fails to commence is included
• The sorting and rework cost formula and rate card are attached as an annex
• Sorting and rework costs incurred in the buyer's country are stated as included

Warranty and liability

• Latent defect liability is stated as not relieved by inspection acceptance
• The warranty period and its start date (shipment date, consumer delivery) are set
• It is set equal to or longer than the warranty owed to domestic sales channels
• Safety-related defects are carved out into a separate clause with no time limit
• Recall decision authority and cost allocation by line item are set out
• Product liability insurance, a copy of the policy, and Korea as a covered territory are confirmed
• A liability cap is set, with exceptions for willful misconduct, gross negligence and bodily injury
• Direct loss is defined to enumerate sorting, retrieval, disposal costs and channel penalties

Recovery and operation

• Claim filing deadlines and start dates are set by defect type
• Claim evidence requirements are specified as a list
• A deemed-acceptance clause for supplier non-response is included
• The set-off clause covers unpaid sums on other orders
• The payment structure is tied to the inspection pass milestone, leaving funds available for set-off
• A four-stage escalation for repeat breaches is defined
• The deadline and location for returning tooling, jigs and materials on termination are stated
• A copy of the agreement is kept at the factory inspection site

Closing: an agreement is not a document for fighting

When I recommend a quality agreement, some clients worry that it will sour the relationship with the factory. In my experience the opposite is true. When the standards are settled in writing, there is simply less to fight about. A deal where you pull out the limit sample and settle the question in five seconds is easier on both sides than one where you argue with feeling, every time, over whether an 8mm scratch passes.

The factory gains something too. Clear standards let them know how far they have to build, and give them grounds to refuse an unreasonable demand by pointing at the agreement. In a relationship with no standards, whoever is stronger gets to insist on the day — and that is tiring for everybody.

What it comes down to is this. You cannot get defects to zero. What you can do, before production starts, is write down what counts as a defect, who fixes it, who pays, and how that money gets collected. That difference is what decides whether 180 defective units become "a clause being applied" or just a difference of opinion.

GreenFrog Seoul works with importers manufacturing in China to lock quality standards into writing before production and to recover costs on the basis of the agreement when defects appear. Where the legal force of a clause, governing law and jurisdiction, or international dispute procedure is involved, have a specialist in that field review it alongside us.