Quarantine and segregation: keeping suspect material genuinely out of reach

A status flag on its own does not stop anybody

Electronic holds work only for people who consult the system before picking, which excludes most of the ways material actually moves inside a factory. A forklift driver clearing a lane, an operator grabbing a box from the end of the line, a fitter taking a component to finish an urgent build: none of these involve a screen. Physical separation is what makes the hold real. A defined area with a barrier, distinct labelling visible from a distance, and stock that has been physically moved rather than merely relabelled where it stands.

The hardest material to control is work in progress

Finished goods are easy to segregate because they are packed and countable. Partly built assemblies are not: they sit on trolleys and benches, they are needed for a line that is still running, and they cannot always be moved without damage. When a hold covers work in progress, the practical answers are to make the boundary of the affected material physically obvious with tape or covers, to stop the operation rather than let it continue producing more, and to assign one person responsibility for the area until the disposition is made. Vague holds over items still in motion are how suspect stock leaks.

Full quarantine areas cause their own failures

Once the hold area fills, the discipline breaks. Material gets stacked outside it, older items get pushed to the back and forgotten, labels fall off, and the area becomes a place where decisions go to be avoided. Age is the signal to watch: anything held longer than a stated period should be escalated to whoever can force a disposition. The alternative is a corner of the factory containing a growing quantity of material whose value is still on the balance sheet and whose condition nobody has checked in years. A monthly walk of the area with the finance and planning functions present tends to produce decisions that a quality reminder on its own never does.

Segregation extends beyond your own four walls

Suspect material may already be at a subcontractor, in a warehouse, on a vehicle or at the customer's plant. A hold that only covers what is on site leaves the largest exposure untouched. The containment step therefore includes contacting whoever holds affected stock elsewhere and getting written confirmation of what they have secured, rather than a verbal assurance that they will look. In practice this is where containments fail, because the internal work feels finished once the plant is clean and nobody owns the external half. Ask specifically for quantities and locations rather than a confirmation that stock has been checked, since the second answer is compatible with nothing having been done.

Releasing material from hold is a decision, not a tidy-up

Stock leaves quarantine only through a recorded disposition signed by somebody with the authority for that outcome. The failure to guard against is release by attrition: a pallet gradually reduced by people taking a few pieces, a label removed by whoever needed the space, or an area cleared during a housekeeping exercise. Both entry and exit deserve a record identifying the material, the quantity and the decision, so that the quantity held at any moment can be reconciled against what physically sits there. Periodic reconciliation of the hold list against the physical area takes an hour and reliably finds material that left without a decision behind it.

Frequently asked questions

Is a locked cage necessary, or is a marked area enough?

It depends on what the material would do if it escaped. A marked and physically separated area handles most ordinary production stock, provided the labelling is unmistakable and the location is not a convenient picking face. Locked control is worth the inconvenience for anything with a safety consequence, anything a customer has specifically instructed you to hold, and any material that closely resembles good stock, since visual similarity is what defeats every other precaution.

How should work in progress be held when the line is still running?

Stop producing more of the affected material first, because a hold that keeps growing is unmanageable. Mark the boundary physically so anybody walking past can see which trolleys and containers are involved, and give one named person responsibility for the area until a disposition exists. Where the line genuinely cannot stop, divert the output to a separate location rather than allowing it to mix with earlier stock, which preserves the ability to bound the problem later.

What stops held material being used when production is short of parts?

Physical distance and a signature. Keep the hold area away from picking routes so taking from it is deliberate rather than convenient, and require a recorded disposition from someone with authority before anything leaves. Accept that the pressure is real and give it a legitimate route: a fast concession review that can approve use where the deviation genuinely does not matter. Blocking the route entirely encourages people to go around it.