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Cited by 45Evolution and Science EducationPhilosophy and History of ScienceOrigins and Evolution of Life

WHAT IS WRONG WITH INTELLIGENT DESIGN?

Open access
Sober, Elliott·2007·The Quarterly Review of Biology
DOI 10.1086/511656
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Abstract

This article reviews two standard criticisms of creationism/intelligent design (ID)): it is unfalsifiable, and it is refuted by the many imperfect adaptations found in nature. Problems with both criticisms are discussed. A conception of testability is described that avoids the defects in Karl Popper's falsifiability criterion. Although ID comes in multiple forms, which call for different criticisms, it emerges that ID fails to constitute a serious alternative to evolutionary theory.

AI snapshot

Written from the paper’s full text.

TL;DR

This review argues that two common objections to intelligent design—unfalsifiability and imperfect adaptations—are inadequate as usually stated, but ID still fails to be a serious scientific alternative to evolutionary theory. It develops a comparative, auxiliary-dependent account of testability and applies it to minimal ID and Behe’s irreducible complexity.

Key findings

  • Mini-ID’s single claim that complex adaptations were made by an intelligent designer is officially neutral on common ancestry, a supernatural designer, and a young earth (e.g., Young Earth Creationism’s 10,000-year claim), so older critiques of those claims do not touch it.
  • Popperian falsifiability is defective: a coin’s 50% heads probability is compatible with any finite sequence, and Fisher-style significance only yields a disjunction—either the hypothesis is false or an improbable event occurred—not a rule for rejecting hypotheses. ID proponents’ falsifiability claims misapply this criterion.
  • Testing is comparative and requires independently justified auxiliary assumptions (Duhem). Mini-ID can be supplemented with assumptions about a designer’s goals, but no independent evidence supports those auxiliaries; ID proponents themselves describe the designer’s motives as opaque or unknowable.
  • Behe’s irreducible complexity argument does not test ID; it only criticizes evolution. It also assumes stepwise fitness increases, ignoring drift and probabilistic evolution, and treats parts as historical stages even when a single genetic module may control a trait such as appendages.

Methods

  • Philosophical/conceptual review and critique; no empirical sample or statistical analysis.
  • Examines two standard anti-ID arguments—unfalsifiability and imperfect adaptations—alongside Popper, Fisher, and Duhem, and ID statements from Behe, Johnson, Dembski, Davis and Kenyon, and Hartwig and Meyer.
  • Main analysis distinguishes mini-ID from broader ID, evaluates testability against evolutionary theory, and assesses irreducible complexity.

Limitations

  • Stated limitations: Not stated in the paper.
  • Evident from the text: the article is a conceptual review without new empirical data and focuses on selected formulations of ID and standard criticisms, not all possible versions.
  • Evident from the text: it relies on philosophical argument and examples; the author notes that claims about irreducible complexity would need careful scrutiny.

Model-written summary. Check it against the paper before relying on it.

Integrity signals

Registry

Crossref · 10.1086/511656

Cites

19 of 19 references verified0 citation errors · 0 not checkable

Statistics

Nothing to recompute.

Claims the paper makes

0 of 8 cited sources checked · 0 supported · 0 flagged

  • Interpretationreasoning
    § WHAT IS WRONG WITH INTELLIGENT DESIGN?

    If we reject theories because they say that observations have low probability, all probabilistic theories will be banished from science once they are repeatedly tested.

    “If we reject theories because they say that observations have low probability, all probabilistic theories will be banished from science once they are repeatedly tested.”
    Quote in the paperSubstantial claim
  • Interpretationreasoning

    ID proponents have misapplied Popper's criterion.

    “The point of relevance here is that these ID proponents have misapplied Popper's criterion.”
    Quote in the paperSubstantial claim
  • Interpretationcitation

    We have no independent evidence concerning which auxiliary propositions about the putative designer's goals and abilities are true.

    “We have no independent evidence concerning which auxiliary propositions about the putative designer's goals and abilities are true (Kitcher 1984).”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites Kitcher 1984

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • Interpretationreasoning
    § WHAT IS WRONG WITH INTELLIGENT DESIGN?

    Evolution does not require that each later stage be fitter than its predecessors.

    “Evolution does not require that each later stage be fitter than its predecessors.”
    Quote in the paperSubstantial claim
    • Rests on an assumption: At least since the 1930s, biologists have understood that evolution can cross valleys in a fitness landscape.
  • Interpretationreasoning

    Popperian falsifiability fails to capture what testability is.

    “The fact that Popperian falsifiability fails to capture what testability is does not mean that we should abandon the latter concept.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites Popper 1959 source
  • Classified as probably not a substantial claim. 9
  • May combine two claims. 5

  • Probably not a substantial claim: may not pass S2 (checkable).

    Interpretationreasoning

    If ID is to be tested, it must be tested against one or more competing hypotheses.

    “If ID is to be tested, it must be tested against one or more competing hypotheses.”
    Quote in the paperNot a substantial claim

  • Probably not a substantial claim: may not pass S2 (checkable), S4 (based). May combine two claims.

    Interpretationnone given

    It is easy enough to construct a version of ID that accommodates a set of observations already known, but it also is easy to construct a version of ID that conflicts with what we have already observed.

    “It is easy enough to construct a version of ID that accommodates a set of observations already known, but it also is easy to construct a version of ID that conflicts with what we have already observed.”
    Quote in the paperNot a substantial claim

  • May combine two claims.

    Interpretationreasoning
    § WHAT IS WRONG WITH INTELLIGENT DESIGN?

    That evolutionary theory says irreducibly complex adaptations have low probability does not justify rejecting evolutionary theory or accepting ID.

    “However, that does not justify rejecting evolutionary theory or accepting ID.”
    Quote in the paperSubstantial claim

  • Probably not a substantial claim: may not pass S2 (checkable).

    Interpretationreasoning

    There is no point in constructing a version of ID that is so minimalistic that it fails to say much of anything about what we observe.

    “nor is there any point in constructing a version of ID that is so minimalistic that it fails to say much of anything about what we observe.”
    Quote in the paperNot a substantial claim

  • Probably not a substantial claim: may not pass S3 (load-bearing), S4 (based).

    Interpretationnone given
    § WHAT IS WRONG WITH INTELLIGENT DESIGN?

    The ID position is inconsistent with the existence of complex information that never had an intelligent designer in its causal history.

    “Granted, the ID position is inconsistent with the existence of complex information that never had an intelligent designer in its causal history.”
    Quote in the paperNot a substantial claim

  • May combine two claims.

    Interpretationreasoning

    Fisher's test of significance fails to provide a criterion for when hypotheses should be rejected, and also fails to describe when a hypothesis is falsifiable.

    “If Fisher's test of significance fails to provide a criterion for when hypotheses should be rejected, it also fails to describe when a hypothesis is falsifiable.”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites Fisher 1959

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • May combine two claims.

    Interpretationreasoning

    The mini-ID claim that an intelligent designer made the vertebrate eye entails that vertebrates have eyes, but that does not permit it to be tested against alternative explanations of why vertebrates have eyes.

    “The mini-ID claim that an intelligent designer made the vertebrate eye entails that vertebrates have eyes, but that does not permit it to be tested against alternative explanations of why vertebrates have eyes.”
    Quote in the paperNot a substantial claim

  • May combine two claims.

    Premisecitation

    Physical theories, on their own, do not make testable predictions; one needs to add auxiliary propositions to the theories one wishes to test.

    “As the philosopher Pierre Duhem (1954) emphasized, physical theories, on their own, do not make testable predictions.”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites Duhem 1954 source

  • Classified as probably not a substantial claim.

    Interpretationreasoning
    § WHAT IS WRONG WITH INTELLIGENT DESIGN?

    If scientists observe purely physical antecedents giving rise to complex information, this does not refute the ID claim, because ID proponents will maintain an intelligent designer was present at an earlier stage.

    “ID proponents will simply maintain that an intelligent designer was present at an earlier stage.”
    Quote in the paperSubstantial claim

  • Probably not a substantial claim: may not pass S2 (checkable).

    Interpretationreasoning

    It is crucial to the scientific enterprise that auxiliary propositions not simply be invented; scientists insist that there be independent evidence for the auxiliary propositions that are used.

    “It is crucial to the scientific enterprise that auxiliary propositions not simply be invented.”
    • Also stated in: § Auxiliary Propositions Must Be · plain
      “An important strategy that scientists use to avoid this nihilistic outcome is to insist that there be independent evidence for the auxiliary propositions that are used.”
    Quote in the paperNot a substantial claim

  • Probably not a substantial claim: may not pass S2 (checkable), S4 (based).

    Interpretationnone given

    Testing is typically a comparative enterprise.

    “To develop an account of testability, we must begin by recognizing that testing is typically a comparative enterprise.”
    Quote in the paperNot a substantial claim

  • Probably not a substantial claim: may not pass S2 (checkable).

    Interpretationreasoning
    § WHAT IS WRONG WITH INTELLIGENT DESIGN?

    These points fail to address how observations could refute either claim.

    “These points fail to address how observations could refute either claim.”
    Quote in the paperNot a substantial claim

  • Probably not a substantial claim: may not pass S2 (checkable), S4 (based).

    Interpretationnone given
    § WHAT IS WRONG WITH INTELLIGENT DESIGN?

    For a proposition to be falsifiable, it is not enough that it be inconsistent with a possible state of affairs; it must also be inconsistent with a possible observation.

    “For a proposition to be falsifiable, it is not enough that it be inconsistent with a possible state of affairs; it must also be inconsistent with a possible observation.”
    Quote in the paperNot a substantial claim
13 of 13

  • The paper relies on this without support.

    The development of legs is not controlled by four sets of genes, one for each leg; rather, there is a single set that controls the development of appendages.

    “In fact, the development of legs is not controlled by four sets of genes, one for each leg; rather, there is a single set that controls the development of appendages.”

  • The paper relies on this without support.

    At least since the 1930s, biologists have understood that evolution can cross valleys in a fitness landscape.

    “At least since the 1930s, biologists have understood that evolution can cross valleys in a fitness landscape.”
2 of 2

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

Each contradiction between two passages listed here was confirmed by an independent check.

  • Kitcher citation year disagrees with the reference list

    Minor

    The text cites Kitcher as a 1984 source, but the only Kitcher entry in the reference list is dated 1982.

1 of 1

Cites

Flagged first, then by citations

Research works printed but not linked: 4

  1. Behe M J, Design for living. New York Times 7 February:A27
  2. Burkhardt F H, 1993, Cambridge: Cambridge University Press.
  3. Dembski W A, 1999, Touchstone, 12, 76
  4. Hartwig M D, A note to teachers. Pages 153–163 in Of Pandas and People: The Central Question of Biological Origins

Cited by

Sorted by citations

Related

Authors
Sober, E.
Affiliations
University of Wisconsin–Madison (US)
Corresponding author
Sober, Elliott
ORCID
Sober, Elliott
Venue
The Quarterly Review of Biology
Publisher
University of Chicago Press
Published
2007-03
Volume
82
Issue
1
Pages
3-8
ISSN
  • 0033-5770 (ISSN-L)
  • 1539-7718
DOI
10.1086/511656
OpenAlex
W2069695733
Cited by
45
References
13
Citations by year
2022: 1 · 2021: 1 · 2020: 1 · 2019: 2 · 2017: 2 · 2016: 3 · 2015: 3 · 2014: 3 · 2013: 3 · 2012: 5
FWCI
25.59
Type
journal article
Language
en
Open access
Locations
  • The Quarterly Review of Biology (publishedVersion)
  • PubMed (publishedVersion)
  • PhilPapers (PhilPapers Foundation) (submittedVersion)
Topics
  • Social Sciences › Arts and Humanities › History and Philosophy of Science › Evolution and Science Education
  • Social Sciences › Arts and Humanities › History and Philosophy of Science › Philosophy and History of Science
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Origins and Evolution of Life
Keywords
intelligent design, creationism, falsifiability, testability, Karl Popper, evolutionary theory, adaptive evolution
MeSH terms
Animals, Biological Evolution, Humans, Phylogeny, Religion

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Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Claims read by deepseek-v4.1-flash under definition version 3 (extract-v3) on 2026-10-11.

Classified by jev-1.13-20260917 (gold-guideline-v0.2) on 2026-10-11.

Statistics and arithmetic are recomputed, not judged.

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