ATLAS OF LANGUAGE

AT-119-036 · ATLAS 260

Naturalistic fallacy

A problematic transition from descriptions of what is to evaluations or claims about what ought to be.

Part of the subject path Argumentation, Logic and Discourse

Why is this entry in the Atlas?

A · Analytical concept R1 · Distinct contribution to understanding

Naturalistic fallacy tests how description is made to support evaluation or prescription. It opens a justificatory boundary while requiring differentiation of Moore's specific account, the is-ought problem and appeal to nature; the broad current entry needs review.

Colours and admission grounds

The rectangular label identifies the entry function: F – linguistic figure or procedure; A – analytical concept; G – foundational concept; E – selected concrete case. The rounded badge indicates the admission ground: R1 – distinctive contribution; R2 – necessary foundation; R3 – justified illustrative case. This editorial rationale explains the current selection rather than claiming an undocumented original selection history.

Explanation

Naturalistic fallacy names related but distinct problems: an unsupported move from factual claims to normative demands, and, in a narrower metaethical sense, reduction of goodness to a natural property. These senses should not be conflated without notice. A description of what is common, biological, or historically given does not by itself establish what ought to be; an additional normative premise is required. Facts may nonetheless matter to value judgements when the evaluative bridge is explicitly justified. The conceptual movement separates descriptive and normative sentences, identifies the missing bridge premise, and tests its justification instead of automatically turning nature into norm.

Movement of thought

1. An argument is first divided into factual claims, value judgements, and demands for action. 2. Analysis locates the inferential point where an is becomes an ought or a definition of the good. 3. A necessary normative bridge premise is made explicit and assessed separately from the facts. 4. A counter-test asks whether the argument has already justified that premise or merely hidden it in wording. 5. The result shows which empirical findings remain relevant and which additional value standard is required.

Scientific use case

Metaethics, philosophy of science, and argumentation studies reconstruct normative bridges and distinguish senses of the term. Empirical research may inform premises but cannot alone generate their validity.

Example

The observation that competition occurs in many groups does not show that institutions ought to maximise it. A further justified premise would be needed to make competition the governing value.

Counterexample

Not every use of biological or social facts in ethical reasoning is fallacious. When an independent normative premise is stated and defended, facts can legitimately affect practical decisions.

Distinction

Distinguish the naturalistic fallacy from Hume's is-ought problem, Moore's open-question argument, and appeal to nature, despite overlaps. The intended formulation must be stated explicitly.

Effect on thought and perception

The diagnosis prevents nature, frequency, or tradition from silently becoming moral authority. Used imprecisely, however, it may wrongly block every empirically informed ethical argument.

Resonance

Facts and values touch but do not flow into each other unaided. A bridge lies between them, and its supporting norm must become visible and open to examination.

Cite this entry

Reich, Michael (Hrsg./ed.): „Naturalistic fallacy“. Atlas der Sprache, AT-119-036. ATLAS 260, data model 1.6.0. https://atlasoflanguage.com/concept/AT-119-036

https://atlasoflanguage.com/concept/AT-119-036

The address remains stable; editorial content may evolve. Editorial reading state: 2026-10-15. Include your access date for precise references.

Historical background

In §10 of Principia Ethica 1903, Moore calls the identification of goodness with other properties the naturalistic fallacy. His argument treats good as a simple quality not definable in that manner. The directly read passage does not simply state the prohibition on deriving an ought from an is. The existing Atlas definition therefore needs a separate conceptual-scope decision, not silent harmonization.

How conceptual history changes the analysis

Defining goodness and inferring obligations from facts are different problems; the intended profile boundary needs explicit clarification.

References for the historical section

Historical source evidence and Atlas applications remain separate; this import does not assert new first attestations or a fresh exhaustive source verification.