A staged programme draws stock from a single supply agreement across multiple towers, floors or delivery windows. Batch continuity is the discipline of keeping that stock within a single manufacturing run — or, where volume prevents it, keeping the transition managed and documented.
Continuity is established at order release by allocating the full programme quantity against one production slot. Where the programme runs longer than a single slot can hold, the release schedule identifies the transition point and holds a control sample from both sides of the break.
Where continuity fails
Failures are almost always procurement failures, not manufacturing failures. Orders released ad-hoc as each stage is called forward will draw against whatever batch is on the bench that week. Aggregate variance across five such draws will exceed the tolerance of any manufacturer.