Definitions sound like academic housekeeping until you realize they decide who gets help. In 2025 two things happened at once: a large expert panel published a new consensus definition of dyslexia, and the International Dyslexia Association updated its own long-standing definition. Both move in the same direction — away from the idea that dyslexia is a surprising gap between a child's intelligence and their reading, and toward a description of the reading and spelling difficulties themselves. That shift is quietly consequential for identification, and worth understanding before your next school meeting.
What does the new definition say?
The consensus, developed through a structured expert process (a Delphi study involving dozens of specialists and people with lived experience), describes dyslexia as "a set of processing difficulties that affect the acquisition of reading and spelling," with difficulties in reading fluency and spelling as key markers across languages and ages. It treats dyslexia as developmental — it looks different at different ages and can change with instruction — and multifactorial, shaped by multiple genetic and environmental influences. Phonological processing stays central, but working memory, processing speed, and orthographic skills are recognized as contributors too.
Why does dropping "unexpected" matter so much?
For decades, many schools used a discrepancy model: a child qualified for dyslexia services when there was a large gap between IQ and reading achievement. The updated definitions remove the old "unexpected in relation to other cognitive abilities" framing. That's not a footnote. The discrepancy approach — still permitted in a large share of states — can deny services to children with average or below-average measured IQ who nonetheless have dyslexia. Reading researchers have argued for years that these children's difficulties are indistinguishable from those of higher-IQ peers. Assessing the skills dyslexia actually affects — phonological awareness, decoding, word reading, spelling — rather than an IQ gap, widens the door to help.
What's the counter-worry?
That the same change could let a different group fall through. A bright child can score at grade level on a reading cutoff while reading far below their own capacity and burning enormous effort to get there — sometimes called "stealth dyslexia." If identification leans only on whether a score clears a threshold, these maskers can be missed. The consensus tries to hold both concerns by favoring professional judgment integrated with testing, and by treating response to intervention as information that informs a diagnosis rather than a gate that blocks it. The definition is broader; the assessment still has to be thoughtful.
How should this shape what you ask for?
- Ask what model your school uses to identify dyslexia. If the answer is a strict IQ-achievement discrepancy, ask how they identify children the gap misses.
- Request assessment of the right skills. Phonological awareness, decoding, word reading, spelling, and fluency — not just a global reading level.
- Bring the effort, not just the score. Describe how hard reading is, how long homework takes, how much they avoid it — evidence a cutoff can't capture.
- Don't let "average scores" end the conversation. Under the new framing, adequate scores achieved with heroic effort still warrant a closer look. Our signs-by-age guide helps you document the pattern.
What should you not conclude?
- "A new definition means an instant diagnosis." It changes the framework, not the need for a careful evaluation.
- "Phonics no longer matters." Phonological processing remains central; the definition adds contributors, it doesn't demote decoding.
- "My state changed overnight." Definitions influence policy slowly; identification practices vary by state and district. See our plain-language explainer for the fundamentals that don't change.
How was the new definition made, and how will it reach classrooms?
The consensus wasn't handed down by a single authority; it was built through a Delphi study — a structured method where a large panel of experts rates statements over successive rounds until broad agreement emerges. Here, dozens of specialists, including people with lived experience of dyslexia, rated 55 statements, and the ones clearing an 80% agreement bar formed the backbone of the definition. That process matters because it deliberately dilutes the influence of any single guru or program, which has been a recurring problem in a field crowded with commercial interests. A definition many independent experts endorse is harder to wave away than one organization's house view.
The harder question is how long it takes to reach an actual classroom. Definitions ripple outward slowly: into professional guidance, then state handbooks, then the eligibility forms a school psychologist fills out. A research consensus published in 2025 might not change your district's identification paperwork for years, if it does at all. That lag is exactly why individual advocacy still does the heavy lifting. You don't have to wait for your state to rewrite its rules to ask that your child be assessed on the skills dyslexia actually affects, rather than on an IQ-achievement gap — and to point to the shift in expert consensus when you do.
Frequently asked questions
Is dyslexia still about phonics and sounds? Yes. Phonological processing — noticing and working with the sounds in words — remains central to the new definition. What changed is the addition of other contributors, such as working memory and processing speed, and the removal of the old requirement that reading trouble be "unexpected" given a child's IQ.
Does the new definition mean more kids will be identified? Potentially. Removing the IQ-discrepancy logic can open services to average- and below-average-IQ students who were previously screened out. Whether that happens depends on states and districts updating their identification practices, which tends to lag definitions by years.
Will this change my child's IEP? Not by itself. An IEP is driven by evaluation data and need, not by the definition's wording. But the new framing can strengthen a request for the right assessments — and for services when scores look "good enough" but effort and skills tell a different story.
Source: "What a New Dyslexia Definition Could Mean for Schools" — Education Week; Reflections on the 2025 consensus definition of dyslexia (Carroll et al.) — PMC