Rejected Material Back on the Line the Next Day? — Five-Step Method for Graded Authorization and Closed-Loop Control of Incoming Material Concessions

1. How Casual Was That "Special Release Form" Signed?

On a Monday morning at an electronics manufacturing company, the IQC inspector marked a batch of connector terminals as "return" on the inspection report: the drawing required a minimum plating thickness of 0.8μm, but the actual measurement was 0.62μm, exceeding the specification limit. At ten o'clock in the morning, the purchasing manager brought the production plan to the quality manager—this batch of material was the only inventory for two production lines the following week, and the supplier would need five days to produce and deliver a new batch. By noon, a "Concession Application Form" had been signed by three people: purchasing signed "affects delivery," production signed "agrees to use," and the quality manager signed "limited to this batch only." By two o'clock in the afternoon, the material was back on the line.

Three months later, the client reported a batch of complaints due to terminal oxidation causing contact issues. The client's SQE reviewed the traceability data and found that the batch number of the problematic material was exactly the one that had been "concessioned" earlier. The second point in the audit conclusion read: "This concession was not authorized in writing by the customer, and the scope, quantity, and validity period were not defined."

This is not a story about whether to release the material, but rather about whether the release has boundaries. Concession is not a negative example in the quality management system; it is a recognized disposal path. What often trips up companies is not the act of making a concession, but the lack of cost, duration, authorization level, and closed-loop control—once signed, no one remembers it is still running on the production line.

2. What Exactly Is Concession? — Clarify Three Baselines

First, distinguish between two concepts that are often confused and used interchangeably.

Concession (often called "special release" or "deviation acceptance" in the industry) is for materials or products that have already been produced and judged as nonconforming, where the company applies to conditionally accept them within a specific scope. Deviation, on the other hand, is for a certain batch that has not yet been produced, allowing the supplier or internal process to deviate from a specific requirement beforehand. The former is a post-incident remedy, while the latter is a pre-incident authorization. The approval logic, traceability methods, and closed-loop actions for both are different.

Baseline One: For characteristics specified by the customer, authorization must come from the customer. When nonconformity involves customer-specified requirements, the standard disposal path clearly includes "informing the customer and obtaining authorization." In other words, internal signatures can only address the question of "whether we are willing to bear the responsibility" and cannot replace "whether the customer agrees." Even if the internal three signatures are straightforward, the material is still considered a nonconforming product in the eyes of the customer if it involves customer design specifications such as dimensions, materials, and performance characteristics.

Baseline Two: Concession is not about lowering the standard, but about temporarily exempting this batch from a specific clause. The drawings, control plan, and inspection standards remain unchanged; what changes is the disposal conclusion for this batch of physical items. Therefore, a concession must be subject to three hard constraints: scope (which batch, which batch number, which characteristic), quantity (upper limit in units or kilograms), and time (valid until when, how to handle remaining inventory). Without any of these, the concession will automatically expand into an "implicit standard."

Baseline Three: Concession is a risk-pricing behavior, and its depth must be graded according to the characteristic level. The essence of judging whether a concession can be made is to calculate three factors: the severity of the failure consequences, the probability of nonconformity in this batch, and the exposure quantity. A deviation of 0.1mm in appearance and a deviation of 0.1mm in a safety-related fit dimension are entirely different.

3. Five-Step Method: Controlling Concessions within a "Framed Cage"

Step One: Define Boundaries—Write a "No Concession List"

The most effective first step in controlling concessions is not to expand the approval process but to narrow the scope. Quality, technology, sales, and purchasing should work together to clearly define situations where concessions are never allowed, typically including:

• Nonconformities involving safety, regulations, environmental protection, and certification validity (such as flame retardant ratings, limits on harmful substances);
• Customer-specified CC characteristics or items explicitly stated in the contract as not eligible for concession;
• Batches that have been delivered and rejected by the customer (these fall under corrective actions and should not be processed as concessions);
• The same material from the same supplier that has reached the maximum number of concessions (to prevent "multiple concessions" from becoming de facto relaxation);
• Characteristics with failure modes that worsen over time—corrosion, aging, oxidation, and fatigue deviations must not be released based on "current measurements are acceptable."

This list should be included in the "Nonconforming Product Control Procedure" and the supplier quality agreement, so that purchasing and production know the answer before submitting an application, rather than relying on the quality manager to handle pressure on-site every day.

Step Two: Build a Graded Authorization Matrix—Who Approves, and How Much

A common issue in companies with uncontrolled concessions is that the approval authority only has "sign or not sign" options, without "how much to sign." It is recommended to create a matrix that includes four dimensions and post it in the review meeting and system process:

When implementing the matrix, two details are worth insisting on: one is linking authorization to cost, where the costs involved in the concession (sorting time, rework, reinspection, customer discount risk) are factored into the approval judgment; the other is recording the approval in the system, rather than leaving it in a drawer as a paper signature.

Step Three: Concession Application Forms Must Include All Elements, and Customer Authorization Must Be in Writing

A concession application form that can withstand customer audits and traceability must include at least ten elements: material/product name and drawing number, supplier and material batch number, nonconforming characteristics and actual measurement data (with inspection records and measurement methods attached), preliminary judgment of the nonconforming cause, impact scope (quantity, inventory, in-process, shipped), risk assessment conclusion (function/assembly/lifespan/appearance), proposed supplementary measures (tightened inspection, sorting, additional testing), upper limit of quantity and validity period, authorization level and signatures, and written evidence of customer authorization.

The easiest element to fake is the last one. If the customer verbally responds, "send it first, we will verify internally," and this is not followed up with a written confirmation, the concession will have no record in the customer's archives six months later. Suggested practice: within 24 hours of a verbal response, send a "Concession Confirmation Letter" to the customer for confirmation, specifying the batch number, quantity, deviation content, and agreed responsibilities; if the customer does not respond, treat it as unauthorized and do not release.

Step Four: Release Does Not Mean the End—Traceability and Isolation Must Be Done Simultaneously

The most dangerous state for concessioned material after it enters the factory is "mixed": mixed with other conforming materials, mixed with different batch numbers, mixed with reworked materials. On the day of release, four things must be completed:

1. Special Identification: Add a conspicuous label to the concessioned batch number (color label + label noting the concession form number), and maintain the label until the material is fully consumed;
2. Batch Locking: Lock this batch of inventory in the system to a specific work order or customer order, prohibiting its use in other orders, especially export or high-risk customer orders;
3. Shipping Documentation: If the concession has been authorized by the customer, mark the concession form number and deviation content in the shipping records and accompanying documents (such as the remarks section of the certificate of conformity, COA/COC explanation) to ensure the customer can trace it;
4. Remaining Inventory Disposal Plan: Agree on how to handle remaining inventory when the validity period expires, orders are canceled, or the customer withdraws authorization (return, scrap, downgrade for other uses), and clearly specify the responsible person and timeline.

Step Five: Closed-Loop Three Actions—Transition to Permanent Measures, Hold Suppliers Accountable, and Review Ledgers

The true role of concessioned material is to "exchange time for a controllable risk," and this time must be used for improvement. For every concession that has been released, three actions must be completed before closing:

• Transition to Permanent Measures: If the deviation is due to internal factors (insufficient process capability, overly strict standards), initiate internal changes (process parameters, inspection tools, standard reviews); if it is due to external factors (supplier process capability issues), issue a supplier CAR, requiring them to submit and verify corrective actions;
• Hold Suppliers Accountable: The sorting time, rework, reinspection, and customer discount costs associated with the concession should be claimed from the supplier according to the quality agreement, making "applying for a special release" a costly action for the supplier;
• Review Ledgers: Concession records should be included in the monthly quality meeting, focusing on five indicators—number of concession batches (sorted by supplier/material), proportion of concession quantity, concession cost, customer authorization timeliness, and closed-loop rate of transitioning concessions to permanent measures.

The value of the ledger lies in identifying trends. If the same material from the same supplier has been concessioned three times in six months, it indicates that the issue is not sporadic but a long-term process capability deficiency. At this point, a supplier on-site audit or even a re-evaluation of their supply qualification should be triggered, rather than signing off on a fourth concession.

4. Six Common Misconceptions

Misconception One: Treating Concession as a Supply Assurance Tool. Some companies issue dozens of concession forms each month, accounting for nearly 10% of incoming material batches, essentially using "special release" to fill gaps in planning and purchasing. A healthy reference line is for the proportion of concession batches to remain below 2% to 3% in the long term, and to be concentrated in sporadic batch deviations, not used daily.

Misconception Two: Signing Forms Without Defining Scope. A concession form without an upper limit on quantity or a validity period is equivalent to a long-term pass for the material. Subsequent batches with the same deviation may be rejected by IQC, but purchasing can dig up old forms and say, "it was released this way last time," effectively lowering the standard.

Misconception Three: Using Verbal Authorization Instead of Written Authorization. When the customer's production line urgently needs the material, "send it first, we will handle it internally" sounds like a win-win. However, if the customer later traces back and finds an issue, the company will have no authorization evidence, and all responsibility and claims will fall on the company.

Misconception Four: Not Marking or Tracing Concessioned Material After Release. Mixing and using concessioned material with conforming material can make it impossible to identify "which batches had issues" if the customer complains, making the traceability gap more fatal than the concession itself.

Misconception Five: Treating Reworked and Conforming Material as Concession. If a nonconforming product is reworked and re-inspected to conform, it is now a conforming product, not a concession. Confusing the two can lead to reworked products being incorrectly marked as "concessioned," increasing customer doubts and obscuring the true data of the rework process.

Misconception Six: Releasing Without Management, Not Holding Suppliers Accountable, and Not Updating Documents. The final manifestation of a missing closed-loop in concessions is that the same deviation is released once, twice, three times, and the supplier's quality agreement, FMEA, control plan, and incoming inspection standards remain unchanged, causing the issue to cycle.

5. A Process to Reduce Monthly Concession Forms from 37 to 8

A certain automotive parts company producing aluminum die-cast components found that the average number of concession application forms in the first half of the year was 37 per month, with 62% concentrated on four materials from three suppliers, and the most extreme case being a material released five times in one quarter. More troubling was that only 11 of these concession forms had customer written authorization, the rest were internally signed by three people. Six months later, a batch of concessioned castings caused assembly interference at the customer's site, leading to a 4-hour production halt, with claims and rectification costs far exceeding the value of the material itself.

The company subsequently took four actions: first, they issued a no-concession list, marking all safety-related sealing dimensions and customer-specified CC characteristics as non-concessionable; second, they established a four-level authorization matrix (A/B/C/D) and wrote it into the system approval flow, requiring C-level concessions to have customer written confirmation before proceeding to the release stage; third, they mandated that concession forms include an upper limit on quantity and a validity period, with the system automatically reminding and locking the inventory upon expiration; fourth, they included concession records in the monthly supplier evaluation, automatically triggering a supplier on-site audit for the same material if it was concessioned twice in a quarter.

The first two months of implementation were painful, with production and purchasing complaining about the strictness. However, within six months, the average number of concession forms dropped to 8 per month, all concentrated on general characteristics and appearance-related items. The nonconformity rate from the same three suppliers decreased by about 30% due to accountability and on-site audits, and there were no more customer complaints due to concessioned batches. The quality manager's summary was straightforward: "Concessions have not been banned, but finally, someone is taking responsibility for them."

6. One-Line Summary

Concession is not a free pass for inspection, but a conditional release that requires authorization, a defined period, and accountability—what is released is risk, and what must be recovered is improvement.

Concessions can be released, but risks must have a master, a duration, and a record.

Knowledge code: 9.2.1

Version: v20260916

Author: QTank QTank is dedicated to providing systematic professional knowledge, methodologies, and practical tools for quality management practitioners, helping companies continuously improve their quality capabilities.