One-Minute Test

Abstract

The One-Minute Test (originally developed in Dutch as the Eén-Minuut-Test, or EMT) is an individually administered, standardized psychometric instrument designed to assess technical reading fluency, specifically the speed and accuracy with which an individual can decode isolated, non-contextualized printed words. Developed by B. Th. Brus and M. J. M. Voeten in 1973 and later revised in 1995, the instrument operates as a cornerstone of educational and clinical reading diagnostics across the Netherlands and Flanders (Belgium). The assessment assesses the theoretical construct of visual word recognition efficiency, isolating lexical and sublexical orthographic-to-phonological translation processes from linguistic guessing strategies or contextual scaffolding. The test comprises two structurally parallel forms (Form A and Form B), each consisting of 116 unconnected words presented in columns arranged in ascending order of phonological and morphological difficulty, ranging from simple monosyllabic words with consistent grapheme-phoneme correspondences to complex, polysyllabic, morphologically opaque structures. The examinee is instructed to read as many words aloud as accurately and quickly as possible within a strict time limit of 60 seconds. Scoring is based on the total number of correctly articulated words produced before the 1-minute expiration. Extensive psychometric evaluations by the Dutch Committee on Tests and Test Affairs (COTAN) and independent educational researchers have confirmed high parallel-form reliability ($r ge .90$) and test-retest stability ($r = .85$ to $.92$). Furthermore, the instrument demonstrates robust construct, convergent, and criterion-related validity, correlating strongly with pseudoword decoding assessments (such as the Klepel) and connected text reading metrics. The One-Minute Test serves as a primary screening and diagnostic tool for identifying developmental dyslexia, tracking responsiveness to tier-based interventions, and conducting neurocognitive research on reading acquisition.

Keywords

One-Minute Test, Eén-Minuut-Test, EMT, reading fluency, word decoding, dyslexia assessment, orthographic processing, phonological recoding, educational psychometrics, technical reading ability

Authors

The One-Minute Test was authored by B. Th. Brus and M. J. M. Voeten. The original research and psychometric standardization were conducted under the auspices of the Department of Educational Sciences and Psychometrics at the Radboud University Nijmegen (formerly the Catholic University of Nijmegen), the Netherlands. Subsequent clinical norming and distribution were maintained through Dutch educational publishing houses, notably Berkhout Nijmegen and Boom Uitgevers Amsterdam.

Purpose

The primary objective of the One-Minute Test is to quantify technical reading competency (technische leesvaardigheid), conceptualized as the automated ability to transform printed graphemic representations into their corresponding phonological codes rapidly and accurately. Unlike broader reading comprehension batteries that capture higher-order cognitive processing, inferential reasoning, working memory, and lexical-semantic integration, the EMT specifically isolates lower-order decoding efficiency. By presenting words devoid of semantic context or syntactic cohesion, the instrument prevents the test-taker from compensating for underlying decoding deficits through contextual guessing, linguistic predictability, or conceptual knowledge.

In educational and clinical environments, the EMT fulfills several vital functions:

• Early Identification and Universal Screening: In primary education settings (Grades 1 through 6, or Groep 3 to Groep 8 in the Dutch educational system), the test identifies children who fall into the lowest performance percentiles, flagging those at risk of specific reading disabilities.
• Differential Diagnosis of Dyslexia: The EMT is an indispensable component of standard clinical diagnostic protocols for developmental dyslexia in the Low Countries, frequently administered alongside pseudoword decoding metrics (such as the Klepel) and continuous text reading inventories (such as the AVI system). A pronounced deficit in the EMT, paired with resistance to standard remedial instruction, constitutes key objective evidence for severe and persistent decoding automation problems.
• Progress Monitoring and Longitudinal Tracking: Because the EMT features parallel forms (Form A and Form B) that minimize test-retest practice effects, educators and speech-language pathologists utilize the assessment to measure developmental trajectories and quantify intervention efficacy following targeted phonics or orthographic training programs.
• Cognitive and Neuropsychological Research: The scale functions as a continuous index of word recognition automaticity in cognitive psychology studies examining eye-tracking paradigms, event-related potentials (ERPs) during visual word processing, and cross-linguistic variations in orthographic depth.

Psychological Construct

The psychological construct evaluated by the One-Minute Test is visual word recognition efficiency, often termed word reading automaticity. This construct operates at the nexus of visual-perceptual analysis, orthographic processing, phonological assembly, and rapid articulatory execution. Rather than treating reading as a static skill, the construct emphasizes temporal dynamics: the operationalization of decoding proficiency is measured through the rate of lexical access under timed constraints.

Subcomponents of the Construct

Although the EMT produces a single composite raw score representing the total number of words correctly decoded in one minute, successful performance depends on the synchronous functioning of several cognitive submechanisms:

• Grapheme-to-Phoneme Mapping (Sublexical Route): Especially relevant when reading less familiar or structurally complex items on the list, the reader must rapidly dissect orthographic strings into constituent graphemes, apply rule-based letter-sound correspondences, and blend them into a coherent phonetic output.
• Direct Lexical Orthographic Access (Lexical Route): Proficient readers bypass serial phoneme assembly by utilizing direct visual-orthographic representations stored in the mental lexicon. This allows instantaneous word identification, minimizing cognitive load and facilitating high-speed articulation.
• Phonological Assembly and Articulatory Planning: Upon accessing the lexical or sublexical representation, motor programming for vocal tract articulation must proceed without hesitation. Children with broader developmental language disorders or phonological retrieval deficits frequently exhibit latency bottlenecks during this stage.
• Inhibition of Contextual Intrusion: Because the stimulus list presents unrelated, isolated words, the cognitive apparatus must suppress semantic priming or anticipatory syntactical expectations, maintaining strict fidelity to the visual input.

Performance on the EMT reflects the degree to which these operations have shifted from effortful, resource-intensive decoding to fully automated, effortless processing, as posited by automaticity models of cognitive development.

Theoretical Framework

The design and theoretical validity of the One-Minute Test are grounded in foundational cognitive models of reading acquisition and word recognition, most notably the Dual-Route Cascaded Model of Visual Word Recognition and Reading Aloud (Coltheart et al., 2001) and the Phase Model of Reading Development (Ehri, 2005).

The Dual-Route Hypothesis

According to the dual-route framework, reading printed words aloud relies on two distinct yet interactively functioning computational pathways:

1. The Nonlexical (Sublexical) Route: This pathway converts letters to sounds via grapheme-phoneme correspondence rules. It is crucial for decoding novel words, low-frequency words, and pseudowords. This route is slower and computationally demanding.
2. The Lexical Route: This pathway recognizes printed words as distinct visual orthographic entities, directly activating entries in the mental lexicon and their linked phonological forms without intermediate phonemic assembly.

The EMT utilizes a list that escalates in linguistic complexity. Early items are short, high-frequency monosyllables that can be rapidly resolved via either the lexical route or simple phonological recoding. As the reader advances toward polysyllabic, low-frequency compound words and derived forms, the strain on both routes escalates exponentially. Disparities between accuracy and speed reveal whether an individual relies excessively on an underdeveloped, laboured sublexical procedure or has successfully cultivated a rich, directly accessible orthographic lexicon.

Automaticity Theory and Information Processing

The theoretical rationale for the strict 60-second administration time is derived from the Automaticity Model of Reading developed by LaBerge and Samuels (1974). Human cognitive architecture operates under severe working memory constraints. If the decoding of written symbols demands deliberate, conscious attention, central executive capacity is depleted, leaving minimal cognitive resources available for semantic integration and contextual comprehension. By quantifying decoding efficiency in words per minute, the EMT captures the degree of reading automaticity, providing a diagnostic marker for whether reading difficulties stem from higher-order conceptual deficits or low-level decoding bottlenecks.

Validity

Empirical investigations over four decades have produced extensive validation data for the One-Minute Test, establishing its utility across educational, clinical, and neuropsychological frameworks.

Construct and Convergent Validity

The construct validity of the EMT is confirmed by strong correlations with other validated reading metrics. In standardizations conducted across primary and secondary school populations, EMT scores show correlation coefficients ranging between $r = .75$ and $r = .88$ with continuous text reading measures such as the AVI (Analyseren van Individualiseringsvormen) tests. When correlated with the Klepel—a standardized Dutch test measuring pseudoword decoding fluency (van den Bos et al., 1994)—the EMT yields correlation coefficients consistently between $r = .78$ and $r = .85$. This demonstrates that while the EMT taps real-word orthographic memory, it remains anchored to general phonological decoding mechanisms.

Criterion and Predictive Validity

Longitudinal studies evaluating the predictive power of early primary school reading tests indicate that EMT scores obtained at the end of Grade 1 (Groep 3) strongly predict subsequent reading comprehension performance, spelling achievement, and overall academic attainment in Grade 6 (Groep 8). Standardized regression analyses have revealed that EMT decoding speed accounts for a substantial proportion of unique variance in standardized national achievement tests (such as the Dutch CITO school leaver tests), even after controlling for nonverbal intelligence and socioeconomic background.

Discriminant and Clinical Validity

The EMT exhibits clinical discriminant validity in distinguishing between typically developing readers and individuals diagnosed with developmental dyslexia or specific learning disorders. Children with clinical dyslexia diagnoses typically score more than 1.5 to 2 standard deviations below the age- and grade-adjusted population means. Furthermore, receiver operating characteristic (ROC) curve analyses indicate high sensitivity (frequently exceeding $85%$) and specificity (exceeding $88%$) in differentiating fluent from severely dysfluent readers when utilizing standard clinical cutoff percentiles (e.g., the 10th percentile or stanines 1 and 2).

Reliability

The One-Minute Test demonstrates strong psychometric reliability across internal consistency, alternate-form equivalence, and temporal stability metrics.

Parallel-Form Reliability

Because the EMT comprises two standardized versions (Form A and Form B) matched for item length, orthographic complexity, and word frequency distributions, alternate-form reliability serves as a primary metric of measurement precision. Across diverse norming cohorts (spanning Grade 1 to adult samples), Pearson correlation coefficients between Form A and Form B, administered within brief intervals, consistently fall between $r = .89$ and $r = .94$. This confirms that the two parallel test forms can be used interchangeably in pre- and post-test experimental or clinical intervention designs without substantial measurement artifact.

Test-Retest Stability

Test-retest reliability has been evaluated over short intervals (e.g., two to four weeks) and extended durations (e.g., six months). Over short durations, test-retest correlations remain high ($r = .88$ to $.92$). Over longer longitudinal intervals spanning entire academic years, stability coefficients remain solid ($r = .75$ to $.84$), reflecting both trait stability in decoding competence and predictable developmental maturation.

Standard Error of Measurement

The Standard Error of Measurement (SEM) for the EMT is low. Depending on the specific grade band and norm table applied, the SEM typically ranges from 3.2 to 4.8 raw score points. This precision allows clinicians to construct narrow $95%$ confidence intervals around observed scores and determine true clinical changes (Reliable Change Index) following remedial interventions.

Factor Analysis

The structural dimensionality of the One-Minute Test has been analyzed via both classical exploratory/confirmatory factor analyses and Modern Item Response Theory (IRT) paradigms.

Unidimensionality

Confirmatory factor analytic (CFA) models testing the latent structure of the EMT consistently confirm a strict unidimensional model. When items or progressive item blocks (parcels) are evaluated, a single dominant factor—interpretable as Speeded Orthographic Decoding Efficiency—accounts for over $65%$ to $75%$ of the total variance. In multi-test batteries comprising text reading, pseudoword decoding, and orthographic choice tasks, the EMT loads heavily ($> .85$) on the common general reading speed factor (Lexical Access/Fluency), displaying minimal residual variance on non-decoding cognitive factors.

Item Response Theory and Rasch Modeling

Psychometric examinations utilizing the Rasch model and Mokken scaling (non-parametric IRT) have substantiated that the EMT items operate along an ordered continuum of latent trait difficulty ($ heta$). Monosyllabic items demonstrate low difficulty parameters and high discrimination at the lower \end of the ability spectrum, functioning effectively to differentiate readers in the initial months of formal schooling. Polysyllabic, morphologically complex items exhibit high difficulty parameters, offering measurement precision for older children, adolescents, and adults. Item fit indices (infit/outfit mean-square statistics) generally conform to acceptable psychometric parameters ($0.80$ to $1.20$), supporting the assumption of invariant item ordering across demographic groups.

Instrument / Measurement Tool

The One-Minute Test is an individually administered, norm-referenced performance measure designed to evaluate single-word oral reading fluency.

• Test Type: Standardized, speeded, direct performance test (performance-based oral assessment).
• Target Population: Children from middle Grade 1 (Groep 3) through Grade 6 (Groep 8), secondary school students, and adults suspected of persistent literacy deficits.
• Administration Format: Individual oral administration under quiet, distraction-free environmental conditions.
• Materials Required:
  • Standardized stimulus card (laminated card containing Form A or Form B).
  • Examiner recording/scoring sheet.
  • Accurate digital stopwatch or chronometer measuring to hundredths of a second.
  • Writing utensil for tracking errors.
• Item Inventory: Each form (Form A and Form B) consists of 116 unconnected, real printed words organized in four vertical columns. Words increase progressively in structural complexity.
• Administration Time: Exactly 60 seconds (1 minute) of active reading time, preceded by approximately 1 to 2 minutes of standardized instruction and orientation.
• Scoring System and Metrics:
  • Raw Score: Calculated as the total number of words read correctly within 60 seconds. Words read after the 60-second mark are excluded.
  • Errors: Words mispronounced, omitted, substituted, or fragmented without spontaneous self-correction are marked as errors and subtracted from the total number of attempted words (or simply omitted from the count of correct words). Self-corrections made immediately are scored as correct.
  • Norm-Referenced Conversions: Raw scores are converted using national normative tables into Percentiles, Deciles, Stanines, or Standard Reading Quotient scores based on the student’s exact educational grade level (month of testing) or chronological age.

Permissions & Fee and Test Year

The One-Minute Test was initially developed and published by B. Th. Brus and M. J. M. Voeten in 1973, with a major psychometric revision, updated standardization, and expanded national norming published in 1995. The test forms, scoring manuals, and normative materials are proprietary and protected by copyright law.

Commercial distribution and licensing are managed in the Netherlands and Belgium by Boom Uitgevers Amsterdam (and historically associated publishing imprints such as Berkhout Nijmegen). The instrument is not available in the public domain or open-access repositories. Certified educational psychologists, licensed speech-language pathologists, remedial educators, and school diagnostic centers must purchase original test kits, including reusable stimulus cards and official scoring protocols, from the authorized test publisher. Reproduction, digital distribution, or online publishing of the stimulus cards without formal licensing is strictly prohibited.

References

• Brus, B. Th., & Voeten, M. J. M. (1973). Eén-Minuut-Test: Handleiding [One-Minute Test: Manual]. Berkhout.
• Brus, B. Th., & Voeten, M. J. M. (1995). Eén-Minuut-Test: Vorm A en B [One-Minute Test: Forms A and B]. Boom Test Uitgevers.
• Coltheart, M., Rastle, K., Perry, C., Langdon, R., & Ziegler, J. (2001). DRC: A dual route cascaded model of visual word recognition and reading aloud. Psychological Review, 108(1), 204–256. https://doi.org/10.1037/0033-295X.108.1.204
• Ehri, L. C. (2005). Learning to read words: Theory, findings, and issues. Scientific Studies of Reading, 9(2), 167–188. https://doi.org/10.1207/s1532799xssr0902_4
• Evers, A., Braak, M. S. L., Frima, R. M., & van Vliet-Mulder, J. C. (2009). COTAN Documentatie 2009 [COTAN Documentation 2009]. Nederlands Instituut van Psychologen.
• LaBerge, D., & Samuels, S. J. (1974). Toward a theory of automatic information processing in reading. Cognitive Psychology, 6(2), 293–323. https://doi.org/10.1016/0010-0285(74)90015-2
• van den Bos, K. P., Spelberg, H. C. l., Scheepstra, A. J. M., & de Vries, J. R. (1994). De Klepel: Vorm A en B. Een test voor de leesvaardigheid van pseudowoorden [The Klepel: Form A and B. A test for pseudoword reading ability]. Berkhout.
• van den Bos, K. P., lutje Spelberg, H. C., & Stolp, E. M. (2006). De Eén-Minuut-Test en de Klepel: Stabiliteit van de scores over de basisschooljaren [The One-Minute Test and the Klepel: Stability of scores across primary school years]. Tijdschrift voor Orthopedagogiek, 45(4), 163–175.

Items of the Scale