Individual differences in language skills (IDLAS) Test batteries

Welcome to IDLAS!

The Individual Differences in Languages Skills Test Batteries are flexibly adaptable test batteries that can be used by researchers for scientific studies. Researchers can easily create their own version of the IDLaS by selecting which tests they want to use. The tests in these test batteries fall under the broader categories of linguistic experience (e.g., vocabulary or grammar), general-cognitive abilities (e.g., working memory or processing speed) and linguistic processing (word/sentence production/comprehension).

IDLaS is currently available in the Dutch and German, and is being developed in English.

The IDLaS-NL Test Battery was developed from 2017 to 2022 by a research team at the Max Planck Institute for Psycholinguistics in Nijmegen and was funded by the Language in Interaction Consortium. IDLaS-NL is available online as a customizable battery that researchers can use for their own projects. More information on how to use the test battery can be found at www.mpi.nl/idlas-nl.

The IDLaS-DE Test Battery was completed in 2025 and is now also available for use as a customizable battery. For more information or to make your own task battery, visit www.mpi.nl/idlas-de.

The IDLaS-EN Test Battery is currently being developed at the Max Planck Institute for Psycholinguistics. Test development is approaching completion and large-scale piloting will start soonFor updates on the current state of IDLaS-EN, please visit: www.mpi.nl/idlas-en.

FAQs

1. How can I access the test batteries?

Currently, the IDLaS test battery is available in Dutch and German. The English version is still under development, but will be online soon. To access the Dutch or German test batteries, please go to the project-specific webpage at either  www.mpi.nl/idlas-nl or www.mpi.nl/idlas-de. There you will find all necessary instructions.

2. When will IDLaS-EN be online?

IDLaS-EN is currently in its piloting phase. The planned release date for the online test battery will be announced shortly. 

3. Who should I contact if I have questions about the IDLaS batteries?

For questions, please contact Kyla McConnell at kyla.mcconnell [at] mpi.nl (kyla[dot]mcconnell[at]mpi[dot]nl). For questions about the German battery, Kyla will direct you to Sandra Behtke, the main developer of this project, and for the Dutch battery, to Florian Hintz.