9. May 2026

What is Dyslexia? A Parent’s Guide to the New Expert Consensus

If your child is struggling to read or spell, you might be overwhelmed by the amount of confusing information out there. For years, even experts debated how to accurately define and identify dyslexia, leading to a maze of conflicting advice for parents.

To fix this, a groundbreaking project called the Delphi Study was published across 2024 and 2025. A global panel of 71 experts—including teachers, psychologists, researchers, and people who actually have dyslexia—went through multiple rounds of surveys until they reached a strong, science-backed agreement.

The Official Consensus Definition

The panel agreed that dyslexia cannot be boiled down to a single sentence. Instead, the official definition of dyslexia is now made up of these nine specific statements:

1. "Dyslexia is a set of processing difficulties that affect the acquisition of reading and spelling."
2. "In dyslexia, some or all aspects of literacy attainment are weak in relation to age, standard teaching and instruction, and level of other attainments."
3. "Across languages and age groups, difficulties in reading and spelling fluency are a key marker of dyslexia."
4. "Dyslexic difficulties exist on a continuum and can be experienced to various degrees of severity."
5. "The nature and developmental trajectory of dyslexia depends on multiple genetic and environmental influences."
6. "Dyslexia can affect the acquisition of other skills, such as mathematics, reading comprehension or learning another language."
7. "The most commonly observed cognitive impairment in dyslexia is a difficulty in phonological processing... However, phonological difficulties do not fully explain the variability that is observed."
8. "Working memory, processing speed and orthographic skills can contribute to the impact of dyslexia."
9. "Dyslexia frequently co-occurs with one or more other developmental difficulties, including developmental language disorder, dyscalculia, ADHD, and developmental coordination disorder."

What This Actually Means for Your Child

While the scientific statements above are incredibly important for professionals, what do they actually mean for you and your child on a daily basis? Here is a detailed breakdown:

It is a Processing Difficulty, Not an Effort Issue (Statements 1 & 2) The experts agreed that dyslexia is fundamentally a processing difference. It makes acquiring reading and spelling skills unusually hard, even when a child has received good teaching and is otherwise very capable. It is absolutely not a sign of laziness, and it happens across all levels of intelligence. If your bright child's struggles with reading seem "unexpected" compared to how clever they are in other areas, it is because their brain simply processes written language differently.

Fluency is the True Benchmark (Statement 3) In the past, we focused mostly on whether a child could accurately "sound out" a word. Today, experts agree that fluency is a key marker. This is a massive shift. It means that even if an older child eventually learns to read words correctly, the process may remain painfully slow, exhausted, and labored. If reading takes your child far more effort and time than it should, that lack of "automaticity" is a primary sign of dyslexia.

Dyslexia is a Spectrum (Statements 4 & 5) Dyslexia exists on a continuum, meaning it ranges from mild to severe. Your child does not have to fit into a rigid, all-or-nothing box. The severity of their dyslexia will depend on a highly complex mix of their unique genetics and their environment (such as the type of teaching they receive).

The Brain's "Building Blocks" (Statements 7 & 8) For a long time, professionals thought dyslexia was entirely caused by a "phonological deficit"—a struggle to hear, recognize, and manipulate the individual sounds in spoken language. While the new definition confirms this is the most common underlying issue, it isn't the whole story. If your child has dyslexia, they likely also have vulnerabilities in other cognitive "building blocks", including:

• Working Memory: The mental workspace used to hold onto information (like a sentence) while simultaneously doing something with it (like writing it down).
• Processing Speed: How quickly the brain can retrieve information, such as rapidly naming letters or numbers.
• Orthographic Skills: The ability to quickly recognize, form, and remember visual spelling patterns.

Ripple Effects and Overlaps (Statements 6 & 9) Dyslexia rarely travels alone. Because the brain uses language for many things, the struggle to decode words can have a ripple effect, sometimes impacting a student's reading comprehension, their ability to solve word problems in maths, or their success in learning a foreign language.

Furthermore, it is incredibly common for dyslexia to overlap with other conditions. The definition highlights that dyslexia frequently co-occurs with ADHD, dyspraxia (Developmental Coordination Disorder), dyscalculia (severe maths struggles), and Developmental Language Disorder.

How Assessors Spot Dyslexia Today

This new definition fundamentally changes how professionals in the UK identify dyslexia. Assessors no longer rely on a single test score or an outdated requirement that a child must have a massive gap between their IQ and their reading level.

Instead, assessors now act like detectives using a "Risks and Probabilities" model. They gather a variety of clues, combining tests of your child's reading fluency and cognitive skills with detailed interviews, family history, and an evaluation of how your child has responded to extra support in the classroom.

By understanding this modern, deeply researched view of dyslexia, you are in a much better position to advocate for the exact, tailored support your unique child needs to thrive!