Require subgroup outcome testing: What is most defensible?
Input drift is a signal, not proof; subgroup outcome testing is needed before deciding whether continued use remains acceptable.
The question
A school district uses an admissions-support model. Monitoring shows a changed applicant-data distribution, but subgroup outcome quality has not been measured since deployment. The vendor supplies only aggregate accuracy. The district’s governance lead must choose the next owner action before continued use. What is most defensible?
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- Continue unchanged while collecting aggregate accuracy during the next annual review.Aggregate accuracy cannot resolve subgroup outcome uncertainty, and delaying measurement leaves the identified monitoring gap unmanaged.
- Pause all use permanently until a replacement model is procured.A permanent replacement is premature because the evidence gap calls for contextual testing and proportionate risk treatment first.
- Have the vendor confirm that distribution change explains the concern.A vendor explanation does not provide outcome validation, subgroup evidence, or assurance that changed inputs caused degraded performance.
- Require subgroup outcome testing, then reassess continuation with documented thresholds. ✓Changed inputs trigger investigation, while missing subgroup measurements require suitable validation before a continuation decision.
The trap
When drift and incomplete evidence coexist, identify the missing outcome measure rather than inferring harm from drift alone. How to remember it
Input drift is a signal, not proof; subgroup outcome testing is needed before deciding whether continued use remains acceptable.
How many of these would you get right?
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