Rigorous Reasoning
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Inference to the Best Explanation · Free

Argument to the Best Explanation

A structured walkthrough for IBE that makes the reasoning visible. The tool walks you through three stages — observations, competing explanations, criterion-by- criterion scoring — and computes which candidate scored highest. It does not do the inferring. The criteria are fixed (Explanatory Scope, Power, Simplicity, Coherence, Testability), the weighting is equal by design, and the conclusion of an IBE is always provisional — it stands until a better explanation comes along.

Used in: Abductive Logic. The full unit covers what makes an explanation good (not just plausible), why “explains everything” is often a warning sign, and how IBE differs from deduction and from statistical inference.

What needs explaining?

List the facts that need explaining. Be specific. Vague observations make for vague explanations — “productivity dropped” is harder to evaluate than “Q3 revenue fell 18% while Q3 marketing spend increased 12%.”

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Inference to the Best Explanation works only when you've genuinely considered the alternatives. The tool can only rank what you bring to it; if your candidate list is biased — if you only listed explanations you already favored, or if your competitors are straw versions of the real alternatives — the result will be biased too. The structural value of IBE comes from forcing real competition between explanations. The tool can't add competition you didn't bring to it.

Where to go next

Induction Strength CheckerScore the structural strength of an inductive generalization or analogical argument on four criteria. The structural-evaluation sibling for inductive (rather than abductive) arguments.Open tool →Bayesian Update ToolWhen you can quantify the likelihoods, compute posterior probabilities directly. IBE is qualitative ranking; Bayes is quantitative updating — they answer related but different questions.Open tool →Relevance & Sufficiency CheckerOnce you've identified the best explanation, evaluate whether the premises supporting it are individually relevant and collectively sufficient for the conclusion you're drawing.Open tool →Causal Reasoning AnalyzerIdentify candidate causes from observational data using Mill's methods. Often the upstream step before IBE — what causes are even on the table?Open tool →