ÉLimination Et Choix Traduisant la REalité
Updated 2026-08-09
INTRODUCTION
English translation pending.
CORE DEFINITION
ELECTRE, from Elimination Et Choix Traduisant la REalite, is a family of multi-criteria decision methods developed by Bernard Roy in France during the 1960s. It builds an outranking relation rather than a single score. The concordance index measures how much of the weighted criteria support the claim that alternative a is at least as good as b, while the discordance index measures the strongest opposition to that claim. When concordance is high enough and discordance low enough, a outranks b. Variants serve different goals: ELECTRE I selects a small set of good alternatives, while ELECTRE II and III produce rankings. Analyst-set thresholds and veto levels make the method transparent but parameter-sensitive.
SCAFFOLDING EFFECT
Reduce cognitive load
- Use concordance scoring: count how much weighted evidence favors one option over another. - Use veto checks: flag cases where a single criterion's opposition is severe enough to block outranking. - Use partial rankings: accept a shortlist when the evidence cannot fully separate the top options.
Anchor fast decisions
Outranking works by asking whether the evidence is strong enough to accept that one alternative is at least as good as another, without requiring that all criteria agree. Concordance aggregates the supporting weight, while discordance caps how much contrary evidence can be tolerated. Setting a veto threshold lets a single critical criterion block a relationship even when overall support is high, which mirrors how real decisions treat non-negotiables. Because relationships need not be transitive, the result is often a partial order, and the analyst's thresholds shape which alternatives survive elimination.
MINIMUM ACTION
In progress 0/1Practice this model in one real situation:
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Source support: Explicit
- en.wikipedia.orghttps://en.wikipedia.org/wiki/%C3%89LECTREverified
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