Drift is not a simple error
A one-off error can be corrected locally. Drift describes a variation that repeats or expands: from one phrasing to another, from one version to another, from one context to another.
The important signal is therefore not only that an answer changes, but that it changes in a way that gradually redraws the entity’s scope or the reach of a rule.
What actually varies
Drift can affect several layers: retained vocabulary, confidence level, assigned role, evidence hierarchy, the weight given to an exception, or the temporality still treated as valid.
Measuring formulation variance means making those movements visible so that acceptable reformulation can be separated from semantic drift.
When variance becomes critical
Variance becomes critical when it crosses a decision boundary: an offer changes nature, a jurisdiction is moved, an exclusion disappears, or an answer that used to be cautious becomes affirmative.
At that point drift is no longer stylistic detail. It becomes a governance issue because it changes what a third party believes it may do, promise, or deny.
Maintaining temporal continuity
Tracking drift requires public continuity: dated versions, change notes, signals about what is stale, and explicit relations between the current canon and older traces.
Without that continuity, the organisation discovers too late that its historical interpretation has already drifted in silence.
Links and continuity
- Topic: Sense cartographies — Where relative stability is declared, tracked, and linked to other maps.
- Canon-to-output gap — Measure distance from the canon at a given moment.
- Temporal governance — Declare what remains valid, what turns conditional, and what must be retired.