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Minimal Change Counterfactual Construction

Build counterfactuals by editing the antecedent, not by rewriting the world.

This candidate was drafted from queue position 44: minimal_modification_principle. It should be reviewed as a bounded counterfactual-construction archetype, not as another generic counterfactual comparison entry.

Drafting note

The accepted catalog already contains counterfactual_comparison, but that archetype mainly covers the comparison between actual and plausible alternative paths. This draft fills the more specific construction discipline behind the target prime: preserve actual facts while varying only the stated antecedent and its entailed consequences.

Use this draft if the catalog wants direct coverage for the minimal-change / closest-world principle. Merge it downward into counterfactual_comparison only if final reconciliation decides that the parent archetype's plausibility and reference-baseline components should absorb all counterfactual construction rules.

Common Mechanisms

  • Actual Fact Ledger
  • Antecedent Edit Card
  • Closest-World Ranking Table
  • Counterfactual Preservation Checklist
  • Entailment Cascade Audit
  • Gratuitous Change Challenge
  • Hindsight Information Exclusion Test
  • Ideal Baseline Rejection Note
  • Minimal-Difference Matrix
  • Nearby-World Sensitivity Review

Compression statement

Minimal-change counterfactual construction disciplines “what would have happened” reasoning by anchoring the actual fact pattern, declaring the single or bounded antecedent modification, preserving all independent actual facts, admitting only changes entailed by the modification, and ranking candidate alternatives by how little gratuitous alteration they require before using them for causal, evaluative, legal, or design claims.

Canonical formula: counterfactual_world = actual_world − entailed_changes + antecedent_change, selected by minimum gratuitous change under stated similarity criteria

Abstractions this archetype builds on — directly (a source ingredient) or as a related pattern. Links follow the typed catalog namespace.

Built directly on (5)

Also references 8 related abstractions

  • Counterfactual Proximity Weighting: An internal signal is graded not by the outcome alone but by its distance to a nearby counterfactual outcome of different value, so near misses carry near-reward signals.
  • Counterfactual Subtraction: An effect is estimated by subtracting a constructed baseline representing what would have obtained absent the intervention, so the inference rests on the baseline's credibility, not the arithmetic.
  • Determinism: Present state plus laws fix exactly one successor state.
  • Falsifiability: A claim is scientific only if it could in principle be empirically refuted.
  • Nirvana Fallacy: Rejecting a real, available option because it falls short of an idealized counterfactual, when the operative comparison should be against the best feasible alternative.
  • No True Scotsman: When a counterexample to a universal claim appears, membership in the subject category is redefined to exclude it, preserving the claim by emptying it of content.
  • Quantifier: Specifies the scope of a claim over a domain — all, some, none, most, or exactly N.
  • Responsibility Attribution: Assigning credit or blame for an outcome to a particular agent.

Variants

Narrower or domain-specific specializations that share this archetype's core structure. Recognized variants are established; candidate variants are provisional.

Closest-World Selection · mechanism family variant · recognized

A modal-reasoning variant that selects the nearest admissible possible worlds where the antecedent holds.

  • Distinct from parent: The parent is general minimal-change construction; this variant is the possible-worlds semantics version.
  • Use when: Counterfactual truth depends on similarity ordering among possible worlds; The reasoning needs to explain why one alternative is closer than another.
  • Typical domains: philosophy, law governance, causal reasoning
  • Common mechanisms: closest world ranking table, minimal difference matrix

Structural-Causal Minimal Intervention · domain variant · candidate

A causal-model variant that changes one variable or intervention while preserving non-descendant structure and observed background conditions.

  • Distinct from parent: The parent allows modal, legal, historical, or practical closeness; this variant is tied to causal-model semantics.
  • Use when: A counterfactual is interpreted through a causal graph, structural model, or intervention logic; The counterfactual must separate intervention consequences from arbitrary covariate changes.
  • Typical domains: causal inference, epidemiology, policy evaluation
  • Common mechanisms: entailment cascade audit, nearby world sensitivity review

Feasible Alternative Baseline Filter · risk or failure variant · recognized

A decision and policy variant that rejects idealized alternatives unless they were feasible minimal modifications of the actual option set.

  • Distinct from parent: The parent governs all counterfactual construction; this variant specializes in rejecting unavailable ideal baselines.
  • Use when: A real option is being compared with an idealized counterfactual; The risk of nirvana-fallacy reasoning is high.
  • Typical domains: policy evaluation, engineering design, economics finance
  • Common mechanisms: ideal baseline rejection note, hindsight information exclusion test

Near names: Minimal Change Criterion, Closest-World Principle, Parsimony in Counterfactuals.