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Glossary · Meaning and specification

Conjunctive gate

2Instrument

An aggregation rule that accepts only if every required criterion clears its threshold, Γ(z) = ∏ᵢ 𝟙[zᵢ ≥ θᵢ]. Nothing compensates a missed gate, so it encodes fatal failures such as forbidden actions.

Also called: hard gate

Defined in

Handbook · InstrumentAggregation geometryWeighted means assume strengths can offset weaknesses; gates assert some failures are fatal. How criteria combine is a normative decision, so make it explicitly.
Aggregation geometry
The rule that combines criterion-level signals into a decision: weighted mean, conjunctive gate, lexicographic order, Pareto vector, or tail-risk rule.
Compensability
The assumption that a high score on one criterion can offset a low score on another. A weighted mean asserts it; a gate or a lexicographic order denies it. It is a normative claim, never a default.

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