Multiple intelligences: science

Research on multiple intelligences runs from Howard Gardner (1983) through later critiques. Mechanisms are interacting systems.

Evidence percentages below are relative judgements for this atlas, not fabricated precise statistics. Named studies keep their published bands.

Findings

1983 · Howard Gardner — Several relatively autonomous intelligences A criteria-based list (evolution, savants, symbol systems), not a factor analysis.
1938 · L. L. Thurstone — Primary Mental Abilities Earlier multi-factor psychometrics — a reminder that “many abilities” did not start in 1983.
1971 · Raymond Cattell — Gf and Gc A hierarchical pluralism that still acknowledges general variance.
2006 · Lynn Waterhouse — MI lacks required evidence Neuroscience and psychometric claims were, she argued, not met.
2006 · Visser, Ashton, Vernon — MI tasks still show g Designed tasks intercorrelated and loaded on general/broad factors.
1997 · Robert Sternberg — Triarchic / successful intelligence A different multi-part alternative to thin IQ, with its own contested tests.

Symbol-system specialisation — Music, language, space and number can develop on partly separate tracks — a developmental observation older than MI.
Savant and prodigy arguments — Gardner used uneven profiles as existence proofs of autonomy. Critics say anecdotes are not eight IQ scales.
Positive manifold remains — When you measure with tests, abilities still covary. That covariance is the g fact MI never deleted.
Curriculum broadening — The mechanism that actually changed schools: permission to value more kinds of work.

Classroom usefulness as taxonomy

Teachers can plan richer tasks. That is a use, not a validation.

Uneven real-world profiles

Musicians, athletes and diplomats are not the same person. Obvious, not eight IQs.

Gardner’s criteria method

Interesting philosophy of biology and symbol systems; not a measurement model.

Independent MI psychometrics

Waterhouse and Visser: the independent-IQ claim is the weak point.

Replacement of g

Test batteries still show a positive manifold.

Taxonomy versus theory — Calling eight valued domains “intelligences” is a rhetorical move. Critics ask for reliability, validity and independence.
Savants as proof — Treffert’s clinical cases show jagged profiles. They do not, by themselves, validate eight school checklists.
Equity story — MI can fight a single-test caste, or become a new set of labels. Design decides.

Multiple intelligences: size the claim to the study. Interaction, not a 50/50 slogan, is the default model.