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Library / First Principles Framework (FPF) - Core Conceptual Specification
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C.28:4.1 - Causality-Ladder Rung

CausalityLadderRung =
  observationalAssociationRung |
  interventionalActionRung |
  counterfactualComparisonRung
  • observational: passive observation, natural behaviour, or association;
  • interventional: action setting, experiment, policy change, or action effect;
  • counterfactual: counter-to-fact, potential-outcome, or unit-history-conditioned comparison.

Lower-rung data may contribute to a higher-rung result only through a replayable identification, bound, or other specialist result. The rung label itself supplies no support.