What was new in 2025?
Learn the rationale behind the 2025 changes made to the definition of dyslexia. Download the most up-to-date Structured Literacy infomap. Webinar recordings available.
What is Dyslexia? Revised Definition adopted by IDA October 22, 2025
The Southern Region Branches of IDA offered a free webinar on Wednesday, December 10, with guests Dr. Charley Haynes and Dr. Hugh Catts. Learn about the revised definition of dyslexia and the reasoning behind the decisions.
Recording: The recording is housed on the IDA Georgia YouTube Channel.
Slide Deck: The link to the most comprehensive version of the slides is on IDA’s website, below the definition: https://dyslexiaida.org/2025-dyslexia-definition-project/
Final Statement: EXPLANATION of IDA’s 2025 Updated Definition of Dyslexia
Intervention: Structured Literacy Infomap (IDA, May 2025) and Webinar Recording (December 9, 2025)
Additional Resources:
EdWeek Webinar: Bringing Dyslexia Screening into the Future
Snowling & Hulme (2025), Risk Factors for Dyslexia: Addressing Oral Language Deficits
Share (2025), Blueprint for a Universal Theory of Learning to Read: The Combinatorial Model
IDA 2025 Definition of Dyslexia
https://dyslexiaida.org/definition-of-dyslexia/
 |
 |
The International Dyslexia Association (IDA) is pleased to share the 2025 Dyslexia Definition, developed through a rigorous, collaborative process to reflect the latest research and the lived experiences of individuals with dyslexia. To explore the definition in greater depth, including the scientific and community-based foundations that informed its development, visit the 2025 IDA Definition Explanation below and view the October 23, 2025 IDA Definition Presentation (Slide Deck)
Learn More about the Project: The Definition Explained: 2025 Dyslexia Definition Project
_________________________________________________
EXPLANATION
Brief Context. The 2025 revised definition of dyslexia reflects both continuity and growth in the field’s understanding of dyslexia, including the recognition that dyslexia occurs across languages and often impacts many aspects of the individual’s life beyond reading. It builds on IDA’s 2002 working definition, preserving key elements while integrating insights gained over the last two decades. Below, our draft explanations are organized by sentence in the definition:
Keep reading: The Definition Explained: 2025 Dyslexia Definition Project
Share this page with your friends…
