Interactive Dyslexia Test Amsterdam–Antwerp–MBO (IDAA-60)

Description

The Interactive Dyslexia Test Amsterdam–Antwerp–MBO (IDAA-60) is a specialized computerized psychometric screening instrument developed by the University of Amsterdam, in collaboration with educational and research institutions in Belgium, to identify indicators of dyslexia among students enrolled in Middle-Level Vocational Education (MBO) in the Netherlands and Flanders. The instrument was developed as part of the Protocol Dyslexia MBO and is intended primarily as a screening tool rather than a standalone diagnostic assessment. Its purpose is to identify students who may require comprehensive diagnostic evaluation and individualized educational support.

The IDAA-60 focuses on the fundamental cognitive processes underlying dyslexia, including automatic word recognition, phonological processing, orthographic processing, reading fluency, and decoding accuracy. In addition to literacy-related skills, the assessment also examines vocabulary knowledge and basic numeracy skills, allowing educators and clinicians to identify possible co-occurring learning difficulties and develop a comprehensive learning profile for each student.

The assessment is administered digitally through a series of interactive tasks that record both accuracy and response time, providing objective indicators of reading performance and cognitive efficiency. Owing to its standardized administration and automated scoring procedures, the IDAA-60 is widely used in educational psychology, special education, speech and language therapy, neuropsychology, learning disability assessment, and research investigating reading development, dyslexia, and cognitive processing.

Data Analysis and Applications

Data collected using the IDAA-60 are analyzed using advanced psychometric and statistical procedures to ensure accurate identification of reading-related difficulties and associated learning problems.

The assessment includes interactive subtests measuring:

  • reading speed and reading accuracy;
  • word recognition and pseudoword decoding;
  • phonological processing;
  • orthographic processing;
  • vocabulary knowledge;
  • basic arithmetic skills;
  • response time and processing speed.

Together, these measures provide a multidimensional evaluation of the cognitive skills most strongly associated with developmental dyslexia.

Psychometric evaluation of the IDAA-60 typically includes:

  • Internal consistency, assessed using Cronbach’s alpha coefficient, where applicable.
  • Test–retest reliability, to evaluate measurement stability.
  • Construct validity, investigated through Exploratory Factor Analysis (EFA) and Confirmatory Factor Analysis (CFA).
  • Convergent, discriminant, and criterion validity, established through comparisons with other standardized dyslexia and learning-disability assessments.

In research and educational settings, IDAA-60 results are commonly analyzed using:

  • Descriptive statistics, including means, standard deviations, frequencies, and percentiles.
  • Comparative analyses, such as independent-samples t-tests, Analysis of Variance (ANOVA), Mann–Whitney U tests, and Kruskal–Wallis tests, to compare students with and without indications of dyslexia.
  • Correlation analyses, using Pearson and Spearman correlation coefficients to examine relationships among literacy-related cognitive skills.
  • Multivariate statistical techniques, including linear regression, logistic regression, mediation and moderation analyses, and Structural Equation Modeling (SEM) to identify predictors of reading difficulties and broader learning outcomes.

Purpose

The primary purpose of the Interactive Dyslexia Test Amsterdam–Antwerp–MBO (IDAA-60) is to provide early identification of students who exhibit characteristics associated with dyslexia and other learning difficulties, thereby facilitating timely referral for comprehensive psychoeducational assessment and appropriate educational support.

More specifically, the instrument is designed to:

  • evaluate the severity and nature of reading and spelling difficulties;
  • identify possible co-occurring deficits in vocabulary and numeracy;
  • support individualized educational planning and intervention;
  • monitor students’ progress following educational support;
  • contribute to research on dyslexia, reading development, and cognitive functioning in adolescents and young adults.

The IDAA-60 serves as an important evidence-based screening instrument for educational professionals seeking to improve academic outcomes through early identification and targeted intervention.

Scoring

The IDAA-60 consists of a series of interactive computerized subtests that are scored according to:

  • reading accuracy;
  • reading fluency;
  • decoding performance;
  • orthographic processing;
  • vocabulary performance;
  • numeracy performance;
  • response speed;
  • overall cognitive efficiency.

Performance across the individual subtests is integrated to generate a comprehensive cognitive profile describing the student’s strengths and weaknesses in reading-related skills.

Lower performance in reading fluency, phonological decoding, orthographic processing, and word recognition may indicate an increased likelihood of dyslexia or related learning difficulties. Since the IDAA-60 is primarily intended as a screening instrument, its results should be interpreted alongside educational history, classroom observations, and comprehensive psychoeducational assessment conducted by qualified professionals before a formal diagnosis is established.

Comprehensive psychometric evaluation of the IDAA-60 typically includes analyses of internal consistency, construct validity, criterion validity, convergent validity, discriminant validity, and test–retest reliability, supporting its use across educational, clinical, and research settings.

References

Callens, M., Tops, W., & Brysbaert, M. (2012). Cognitive Profile of Students Who Enter Higher Education with an Indication of Dyslexia. PLOS ONE, 7(6), e38081.

Bekebrede, J. I., & van der Leij, A. (2010). Handleiding Interactieve Dyslexietest Amsterdam–Antwerpen–MBO (IDAA-mbo). University of Amsterdam & Muiswerk Educatief.

Van der Leij, A., Bekebrede, J. I., Geudens, A., Schraeyen, K., Schijf, G. M., Garst, H., Willems, H., Janssens, V., Meersschaert, E., & Schijf, T. J. (2013). Handleiding IDAA: Interactieve Dyslexietest Amsterdam–Antwerpen. Muiswerk Educatief.

Kleijnen, M., & Goei, S. L. (2009). Protocol Dyslexie MBO. CINOP.