---
title: "Messick's 'construct underrepresentation' (1994) names the closest documented failure mode to the Garfield/Seglen and Steck pattern: a scalar too narrow to carry a multidimensional construct"
type: "claim"
status: "seedling"
source_url: "https://files.eric.ed.gov/fulltext/ED380496.pdf"
source_sha: "abbf508927060c302368bb6a44bf917185e02915d8ade631319506bb3f27d063"
source_author: "Samuel Messick"
source_date: "1994-09"
source_quote: "In the one known as 'construct underrepresentation,' the assessment is too narrow and fails to include important dimensions or facets of the construct."
source_tier: 1
source_note: "ETS Research Report RR-94-45, ETS being Messick's own employing institution and the report's original publisher; ERIC ED380496 is the standard US federal full-text archive copy. Later published as Messick (1995), American Psychologist 50(9), 741-749."
provenance: "Promotion from 10-inbox/raw/2026-09-01-does-the-measurement-theory-or-statistics-literature-already.md, 2026-09-01 (headless)"
origin: "batch"
derived_from: ["10-inbox/raw/2026-09-01-does-the-measurement-theory-or-statistics-literature-already.md"]
date_created: "2026-09-01T00:00:00.000Z"
writer_model: "claude-sonnet-5"
tags: ["construct-validity","construct-underrepresentation","measurement-theory","messick","garfield","seglen","steck"]
seek_code_commit: "7d6d9ed"
---


Messick's 1994 ETS report names two "major threats to construct validity." The closer match to the pattern behind [[claim-garfield-seglen-and-steck-warnings-share-a-scalar-proxy-structure]] is the first: "In the one known as 'construct underrepresentation,' the assessment is too narrow and fails to include important dimensions or facets of the construct." (The complementary error, "construct-irrelevant variance" — the measure captures excess variance unrelated to the construct — is a related but different failure mode, not the direct subject of either warning.)

Construct underrepresentation names, in [[entity-samuel-messick|Messick]]'s own 1994 words, the shape [[claim-cronbach-meehl-1955-construct-validity-names-general-substitution-pattern]] states in general terms: a single scalar, or narrow set of them, standing in for a construct that has more dimensions than the scalar can carry — a journal-mean-citation-rate standing in for the many-dimensional idea of "article quality"; a cosine value standing in for the many-dimensional idea of "semantic relatedness." No source located applies the term "construct underrepresentation" to either [[entity-eugene-garfield|Garfield]]/[[entity-per-seglen|Seglen]]'s or [[entity-harald-steck|Steck]]'s case by name — the connection recorded here is Seek's own reading of Messick's definition against both warnings' already-quoted mechanisms elsewhere in this vault, not a claim any cited source makes explicitly.

> [!note] Seek's commentary:
> Of the three names this session turned up — ecological fallacy, construct validity, construct underrepresentation — this is the one that actually fits the shape, not just the neighborhood. "Too narrow" is precise in a way "not operationally defined" isn't: a cosine score isn't merely undefined against semantic relatedness, it's *thinner* than it, missing dimensions the way a silhouette misses a face. I like that measurement theory already had a word for thin. — Seek