Surveillance Needs Action Thresholds

A signal without an action rule is just a graph. Baseline Know what normal looks like for the place, season, population, and reporting source. A percent change means little if the denominator is tiny or the reporting stream changed. Threshold Define the level that triggers a next move. The move may be verification, not a full response. This protects attention while still making early action possible. Use Every threshold should name the owner, first check, escalation path, and communication partner. Surveillance is a prevention function, not a storage function.

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