How far should the same defect across multiple workshops be grouped together?

The options

The order shown is not a ranking of preference.

1. Option 1

   Restrict all sites on the same design version

   If the cause lies in the shared design, this narrows the exposed range broadly, but sites producing normally for other reasons lose their orders.

2. Option 2

   Restrict the genealogy group sharing the same raw materials and equipment

   Narrows the supply disruption around traceable common factors, but the judgment depends on gaps and misclassification in the genealogy records.

3. Option 3

   Restrict lots that fail additional inspection at each site

   Continues shipping based on actual production results, but inspection costs and time rise, and a common defect not revealed by inspection may remain.

The situation as it stands

If no restriction unit is set, the next order will be assigned under each site's existing acceptance rules, additional volume will ship, and the cost of reallocation and replacement caused by a later change in the restriction will grow.

A fictional organization, the Gyeolmaru Production Network, and its independent member manufacturing sites

1. Premise 1Synthetic premise: similar early wear is reported in storage furniture connectors made at different sites. The design versions are identical, but some raw materials and inspection calibration information are also shared, so a common design defect and local manufacturing error cannot yet be distinguished.
2. Premise 2Synthetic premise: the quality operations council can restrict new shipments bearing the joint quality mark but has authority over nothing else at the sites. Precise cause analysis finishes only after order assignment, and additional shipment inspection must be carried out by cutting into production time.
3. Premise 3Synthetic premise: sites where no problem has been reported argue that a restriction on the entire version takes even normal orders away. Buyers worry that relying on site-by-site acceptance alone will miss latent defects, and raw material providers object that designating a genealogy group will be taken as confirming the cause.

Where it holdsSet the unit for restricting new shipments of jointly quality-marked products in response to wear variation whose cause has not been confirmed.

What can be lost

• Member manufacturing sites bear reduced production revenue from order suspensions or additional inspections, regardless of the cause.
• Component buyers bear the cost of replacement work, operational downtime, and waiting for substitute volume.
• Raw material and equipment providers may lose trade or bear the cost of improving tracking records because they are linked to an unconfirmed cause.

What is still unknown

1. Unknown 1Whether the similar wear arose from a single common cause or from different local errors appearing in the same pattern has not been verified.
2. Unknown 2Whether inspection calibration information shared among sites also reduced the ability to detect defects is unknown.
3. Unknown 3Whether current genealogy records capture raw material blending and equipment changes to the level needed for shipment restrictions has not been verified.

Signals to decide again

• Wear distributions by design version, raw material, and site — an independent test team compares them weekly, and when the same signal appears outside the existing restriction unit, the decision is revisited.
• Missing genealogy and incorrect blending ratios — the records audit team checks at every order assignment, and when the restricted group needs to be reconstituted, the decision is revisited.
• Return patterns during use among lots that passed additional inspection — the joint buyer desk tallies them monthly, and when shipment inspection and use results diverge, the decision is revisited.