IDA new 2025 Draft Definition of Dyslexia

🧠 IDA 2025 Draft Definition of Dyslexia:

“Dyslexia is a specific learning disability characterized by difficulties in word reading affecting accuracy, speed, or both and/or spelling, that can vary depending on the written language system. These difficulties reflect performance at the low end of a continuum of literacy skill and occur despite evidence-aligned instruction that is effective for the individual’s peers. The cause and development of dyslexia involve the interplay of multiple biological and environmental influences. Phonological and/or morphological difficulties are common but not universal. Among the secondary consequences are limitations in language development and academic progress as well as challenges to psychological well-being and vocational opportunities. Although identification and targeted instruction are important at any age, language and literacy support before and during the early years of education can be particularly effective.

Key Differences from the 2002 Definition:

✅ Language system: Adds that difficulties may vary depending on the orthography (the writing system of a language).
✅ Terminology: The phrase “neurobiological in origin” from the 2002 definition has been replaced with “biological and environmental influences.”
✅ Reading challenges: Expands to include accuracy, speed, or both in word reading.
✅ Continuum: Frames dyslexia along a continuum of literacy skill rather than as an “unexpected” difficulty.
✅ Morphological awareness: Adds morphological processing alongside phonological processing.
✅ Secondary consequences: Broadened to include reading comprehension, writing, language development, well-being, and employment.
✅ Early intervention: Emphasizes that early language and literacy support are particularly effective.

This updated definition reflects decades of research and a growing effort to make the understanding of dyslexia more global, inclusive, and connected to evidence-aligned instruction.

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