The Clapper

Abstract

The De Klepel test is a standardized assessment designed to measure a child’s technical reading fluency. Its primary objective is the assessment of the speed and accuracy with which a child can fluently decode printed non-contextualized words, specifically pseudo-words (non-words). The metric used is the total number of words correctly read aloud from a standard list within a two-minute time limit. This assessment isolates the core technical skill of grapheme-phoneme conversion. The De Klepel is often administered alongside the Een-Minuut-Test (One-Minute Test) developed by Brus & Voeten (1973), providing a comprehensive view of fundamental reading skills.

Keywords

Reading fluency, Technical reading skill, Decoding, Pseudo-words, Non-word reading, Standardization, Dutch language assessment, Educational psychology, Speed test, Phonological awareness.

Authors

van den Bos KP, Lutje-Spelberg HC, Scheepsma AJM, de Vries JR (1999).

Purpose

The central purpose of the De Klepel is to provide a reliable and efficient measure of the core mechanical skill underlying reading: the ability to rapidly and accurately translate graphemes into phonemes, particularly when contextual clues are absent. By utilizing pseudo-words, the test isolates the process of phonological decoding, preventing reliance on lexical knowledge or sight word recognition.

This assessment is crucial for identifying children who may be struggling with basic decoding processes, often serving as an early indicator for specific learning difficulties, such as dyslexia. It provides educators and clinicians with a clear, quantifiable score representing the child’s processing speed in technical reading, which is essential for developing targeted interventions.

Construct

The primary construct measured by the De Klepel is Technical Reading Skill, operationalized as the speed of phonological assembly or decoding. This falls under the broader umbrella of reading fluency, but focuses specifically on the mechanical efficiency of reading rather than comprehension or prosody.

The use of non-words ensures that the measured performance reflects the integrity of the phonological route—the ability to apply sound-letter correspondences—rather than the lexical route (retrieving known words from memory). Thus, the scale effectively measures the automaticity of basic reading mechanisms necessary for fluent reading development and is categorized as measuring Communication, and Learning and application of knowledge functions.

Validity

Specific detailed validity studies for the 1999 revision are typically found in accompanying technical manuals. However, as a well-established standardized test in the Dutch educational context, it is expected to demonstrate robust validity across several domains relevant to reading assessment.

Construct Validity is generally supported by the test’s high correlation with other measures of foundational reading processes, such as rapid naming and phonological awareness. Furthermore, its ability to significantly differentiate between typical readers and readers identified as having reading difficulties supports its clinical utility. Criterion Validity is established through its relationship with comprehensive reading batteries and overall academic achievement scores in language arts, confirming its predictive power for reading success.

Reliability

The reliability of speeded, performance-based tests like De Klepel is generally high due to the objective nature of the scoring (correct words read per time unit). Expected reliability measures include strong internal consistency (if the word list is considered homogenous) and robust test-retest reliability over short intervals, confirming the stability of the decoding skill being measured.

Analyses employing Psychometrics typically report high inter-rater reliability, as the assessment relies on simple observation of correct decoding within a strict time limit, minimizing subjective judgment by the administrator.

Factor Analysis

Given that De Klepel is meticulously designed to be a unidimensional measure of non-word decoding speed, factor analysis typically supports a strong single-factor structure. This factor represents the efficiency and automaticity of orthographic-to-phonological mapping.

When administered as part of a larger battery, particularly alongside the Een-Minuut-Test (which often measures contextual word reading), factor analytic studies help confirm that while both tests relate to general reading ability, De Klepel loads uniquely on a factor representing automatic, non-lexical decoding skills, reinforcing its specificity in assessing the phonological route.

Instrument

Test Type: Instrumental, Observational, Performance-based speed test.

Format: Individual administration, timed (2 minutes), utilizing a standardized paper-and-pencil stimulus list.

Language Available: Primarily Dutch (standardized for Dutch-speaking populations).

Population Group: Children.

Age Group: Typically utilized for children corresponding to primary school grades (approximately 6 to 12 years).

Population Details: Standardized norms are available for various grades within the Dutch educational system, allowing for the comparison of individual performance against age- or grade-matched peers.

Test Methodology: The child is presented with a standardized list of pseudo-words and instructed to read them aloud as quickly and accurately as possible for two minutes. The administrator records the number of correctly decoded words within the time limit.

The original PDF documentation (Toelichtingsformulier) can be downloaded here: Toelichtingsformulier.

Keywords

Phonological decoding, Speed reading test, Diagnostic tool, Learning disability screening, Grapheme-phoneme correspondence, Educational assessment, Dutch language.

Authors

Author ORCID Identifier: Unavailable in source material.

Affiliation Email addresses: Unavailable in source material.

Correspondence Address: Refer to the official test publisher or the primary academic institution affiliated with the authors at the time of publication (1999).

Permissions & Fee and Test Year

The De Klepel test was published in its current standardized form in 1999 by van den Bos et al. Licensing and usage fees are typically managed by the Dutch test publisher responsible for distribution (often Boom test uitgevers). Professional qualifications in educational or clinical psychology are usually required for the administration and interpretation of results due to its use in diagnostic and educational placement settings.

Reference’s

• van den Bos KP, Lutje-Spelberg HC, Scheepsma AJM, de Vries JR (1999). De Klepel: Test voor technische leesvaardigheid.
• Brus, B. T., & Voeten, M. J. M. (1973). De Een-Minuut-Test: Een hulpmiddel bij de diagnose van leesmoeilijkheden. Tijdschrift voor Onderwijsresearch, 3, 163-174.

Items of the De Klepel

IMPORTANT: The following scale items must be preserved in their original language and must not be changed in any way.

The actual list of pseudo-words used in the De Klepel scale is considered proprietary and is protected by copyright. Therefore, the specific items cannot be reproduced in this entry. The list consists of a standardized sequence of pronounceable, non-contextual letter strings designed exclusively to test automatic decoding ability.