The number somebody chose

Problem §

Somewhere in your quality system there is a number somebody chose.

Eight parts per lot at receiving. Twelve months between calibrations. Two operators qualified per station. It sits in a procedure with a revision letter and an approval signature, and it gets followed — properly, consistently, every time.

The uncomfortable part is that the number is not a fact. It is a decision, and the decision had reasons.

Premise §

Eight per lot was right because the supplier’s reject rate sat under one percent. Twelve months was right because the machine ran one shift. Two qualified operators were enough because the product mix looked like 2021.

Each of those is a premise in the sense of the canonical definition: a statement about the world that had to be true for the number to protect, and that was true on the day the number was written. The number is the requirement. The premise is what the world had to be for the requirement to be enough.

Discussion §

The number was preserved. The reasons were not. Document control will keep that number accurate, current and approved for the next twenty years, and nothing in the system — not the audit, not the corrective-action log, not the management review — will ask whether the reasons underneath it are still true. That is the severance the definition describes: the record outlives the world that made it right.

When the reasons quietly die and the number keeps being followed, the control is in Silent Expiry: running, documented, correct, and no longer protecting anything.

The three questions, applied to the first of the three numbers:

• Date. When would the reject rate have crossed one percent — and would anyone at receiving have known the day it did?
• Witness. Who, outside quality, would notice the supplier changing its process? The buyer who saw the price move; the operator who saw the surface finish change. Neither owns the sampling plan.
• Counterfactual. If the reject rate were four percent today, would anything alarm — or would eight per lot keep being drawn, lots keep being accepted, and the records keep being complete?

The third question is the one that matters. A number whose premise could fall without anything alarming is exactly what the definition’s third condition describes.

Conclusion §

Pick one chosen number in your system this week and ask:

1. Who chose it, and from what data — can you even find out?
2. When would it have stopped being right — can you name the change?
3. If it were wrong today, would anything alarm — or would it just keep being followed?

If question 3 goes quiet, you have found your first one.

Permanent URL §

https://silent-expiry.pages.dev/premise-test/01/

Cite as: The Premise Test, No. 1 — “The number somebody chose.” Silent Expiry, silent-expiry.pages.dev, 2026. This article is derived from the canonical definition, Rev3, and does not modify it.