International Dyslexia Association: what it is and why it matters for your child

Last updated 2026-07-10

What is the International Dyslexia Association?

The International Dyslexia Association, almost always called the IDA, is a nonprofit founded in 1949 in honor of Samuel T. Orton, the neurologist whose early research shaped what we now call structured literacy. It is headquartered in Baltimore, Maryland, and has around 40 branches across the United States plus international affiliates. ^[1]

The IDA's work sits where research meets practice. It synthesizes reading science, trains teachers, accredits tutoring programs, publishes standards for structured literacy instruction, and lobbies for state and federal policy that reflects what the evidence actually says about how children learn to read. That sounds like a lot, and it is. But for a parent, the most useful fact is this: the IDA wrote the definition of dyslexia that almost every U.S. state now uses in law.

It is not a tutoring company. It does not diagnose children. It does not run schools. Think of it as a standards body, the organization that sets the bar therapists, teachers, and schools are supposed to meet.

What is the IDA's definition of dyslexia?

The definition matters because it shapes who qualifies for services and what schools are required to do. The IDA's definition, adopted by the National Institute of Child Health and Human Development (NICHD) and written into legislation across the country, reads: "Dyslexia is a specific learning disability that is neurobiological in origin. It is characterized by difficulties with accurate and/or fluent word recognition and by poor spelling and decoding abilities." ^[2]

The full definition goes on to say these difficulties usually come from a deficit in the phonological component of language, and that a person struggles despite adequate instruction and intelligence, in ways that can also hurt reading comprehension and reduce how much they read. That phrase "despite adequate instruction" carries weight. It means a child does not have to fail every possible intervention before the label applies.

More than 43 states have folded this definition, or language pulled straight from it, into their dyslexia statutes. ^[3] That has real consequences. When a state law uses the IDA definition, schools in that state must screen for the specific deficits the definition names, and the interventions they offer must target those deficits. If your state uses the IDA definition and your child's school is offering general reading support that ignores phonological processing, you have a much stronger argument that the school is out of compliance with state law.

You can look up the signs of dyslexia that align with this definition to see whether what you're watching at home matches the research picture.

What does the IDA actually do day to day?

The IDA runs several programs that touch parents and educators in practical ways.

Knowledge and Practice Standards. In 2010 (updated 2018), the IDA published its Knowledge and Practice Standards for Teachers of Reading, which spell out exactly what a structured literacy teacher needs to know: phonology, orthography, morphology, syntax, semantics, and text structure. ^[4] These standards are the basis for the IDA's accreditation of teacher preparation programs and tutor certifications.

Accreditation of programs. The IDA accredits university programs that train reading specialists and recognizes tutoring programs that meet its structured literacy standards. If you're hiring a private tutor, an IDA-accredited program or a tutor with an IDA-recognized credential (like CALT, Certified Academic Language Therapist, or IMSLEC-accredited training) is one of the more reliable quality signals available. Nobody has a perfect registry of every good tutor. But accreditation at least tells you someone has checked the curriculum.

Advocacy and policy. The IDA has a government affairs program and works with state branches to pass dyslexia screening laws, structured literacy mandates, and dyslexia-specific language in IDEA reauthorizations. ^[1] Much of the policy progress in reading law since 2015 traces back in part to IDA advocacy.

Public resources. The IDA publishes free "Fact Sheets" on topics from phonological awareness to accommodations to co-occurring conditions. They are written for educators and parents, they cite primary research, and they are free to download at dyslexiaida.org.

Annual conference. The IDA holds an annual conference, one of the largest gatherings of reading researchers, educators, and clinicians in the country. Presentations pair new reading neuroscience with very practical classroom implementation. Many parents who are serious about advocacy attend.

How does the IDA's structured literacy standard differ from what most schools teach?

This is the gap that frustrates parents most, and the IDA is unusually blunt about it.

Structured literacy, as the IDA defines it, is explicit, systematic, sequential instruction in phonology, phoneme-grapheme correspondence, syllable types, morphology, and syntax. It has the strongest evidence base for students with dyslexia, and it includes well-known programs like Orton-Gillingham, Wilson Reading System, Barton, and RAVE-O. ^[2]

Most U.S. schools have historically used balanced literacy or whole-language approaches that embed some phonics but skip the explicit, systematic, cumulative instruction structured literacy requires. A major 2023 analysis of reading curricula by EdReports found that many of the most widely adopted elementary reading programs scored poorly on foundational skills alignment. The National Council on Teacher Quality (NCTQ) reported in 2023 that only about 23 percent of teacher preparation programs adequately covered the science of reading. ^[5]

The IDA's standards are a direct rebuke to that status quo. When a school says a child is "getting phonics," a parent who knows the IDA standards can ask the right follow-up questions: Is it systematic? Is it cumulative? Is it multisensory? Does the teacher know the 44 phonemes of English, and can she explain the six syllable types? Those questions, drawn from IDA standards, expose fast whether what the school calls phonics actually clears the evidence bar.

For a closer look at one of the most common subtypes, see our article on phonological dyslexia, which is the deficit structured literacy most directly addresses.

How common is dyslexia and what does the research say about outcomes?

The IDA states that dyslexia affects 15 to 20 percent of the population. ^[2] That figure comes from the large-scale epidemiological work of Sally Shaywitz at Yale, whose Connecticut Longitudinal Study tracked reading development across thousands of children and found reading difficulties spread along a normal curve, not as a separate category. ^[6]

Outcomes hinge on when intervention starts. The National Reading Panel and later research consistently show structured literacy intervention works best in kindergarten through second grade, though it produces meaningful gains at any age. ^[11] A 2022 meta-analysis published in Reading and Writing found structured literacy interventions produced a weighted mean effect size of 0.51 on word reading for students with dyslexia, a moderate-to-large effect in educational research terms. ^[7]

Dyslexia does not go away on its own. Without intervention, children with dyslexia usually fall further behind their peers over time because reading builds on itself. The IDA calls this the "Matthew Effect," a term from research by Keith Stanovich: good readers read more, which grows vocabulary and background knowledge, which makes them better readers, while struggling readers read less and slide further back. ^[2]

The practical takeaway is simple. Waiting is expensive. Every school year without appropriate intervention is not a neutral pause. It is a widening gap.

How do IDA standards connect to your child's IEP or 504 plan?

Under the Individuals with Disabilities Education Act (IDEA), specifically 20 U.S.C. § 1414, schools must provide a free appropriate public education (FAPE) that meets the child's individual needs. ^[8] Dyslexia is usually served under the Specific Learning Disability (SLD) category. The IDA's structured literacy standards matter here in two ways.

First, many state special education plans now explicitly require that interventions for students with dyslexia use structured literacy approaches. If your state has a dyslexia law that adopts IDA's definition and mandates evidence-based intervention, that language should show up in IEP goals and services. If it does not, raise it during the IEP meeting.

Second, the IDA's Knowledge and Practice Standards give you a vocabulary for challenging weak IEP services. If an IEP proposes 30 minutes of "reading support" with no description of methodology, you can request, in writing, that the IEP specify whether the intervention is a structured literacy approach, name the specific program, and explain how the interventionist is trained. Schools have to explain their methodology. They are not required to buy a specific commercial program, but they are required to use evidence-based practices. In 2015, the Office of Special Education Programs confirmed schools may use the word "dyslexia" in IEPs and evaluations. ^[9]

For students who do not qualify for an IEP, a 504 plan under Section 504 of the Rehabilitation Act can provide accommodations. ^[13] The IDA publishes a free fact sheet on accommodations that lists specific modifications research supports, including extended time, text-to-speech, and reduced-demand writing tasks. ^[1] These accommodations do not replace instruction, but they lower barriers while a student is still building skills.

A thorough learning disability test is usually the first step toward qualifying for either an IEP or a 504. The evaluation should include phonological processing measures, rapid automatized naming, and reading fluency.

What is the IDA's approach to dyslexia screening and testing?

The IDA advocates for universal screening of all students in kindergarten through second grade using validated tools that measure phonological awareness, letter-sound knowledge, and rapid naming. ^[2] As of 2024, more than 37 states have passed laws requiring dyslexia screening in early elementary grades, most of them following IDA's policy framework. ^[3]

Screening is not the same as a full psychoeducational evaluation. A screening takes 10 to 20 minutes, flags students at risk, and is meant to trigger closer assessment or early intervention. A full evaluation, needed to qualify for special education services, assesses processing speed, working memory, phonological processing, oral language, and academic achievement across multiple domains.

The IDA recommends evaluations use a response-to-instruction model where schools first provide quality core instruction and then monitor progress, but it explicitly warns against using RTI (Response to Intervention) as a reason to delay formal evaluation for a child who shows persistent signs of dyslexia. ^[9] Under IDEA, parents can request a full evaluation at any time, regardless of RTI stage. ^[8] Schools must respond within 60 days of a written request (or the state-mandated timeline, which sometimes differs). ^[8]

If you suspect dyslexia, the process starts with a formal dyslexia test or a school-requested evaluation. The IDA's free resources can help you understand what a good evaluation should include before you walk into that meeting.

Subtypes carry different profiles. A child with rapid naming deficit or double deficit dyslexia needs assessment that captures both phonological processing and naming speed, because standard phonics intervention alone often falls short for double-deficit profiles.

How can parents use IDA resources directly?

The IDA website (dyslexiaida.org) has several free tools worth knowing about.

Branch locator. Every IDA branch keeps a referral list of evaluated tutors, educational therapists, and clinicians in that region. Search by zip code. Quality varies by branch, but it is the closest thing to a vetted national directory that exists.

Fact sheets. The IDA publishes about 30 free fact sheets, covering everything from what dyslexia is to how to talk to your child's teacher. Download them, read them, and bring the relevant ones to school meetings. They cite primary research and carry IDA's institutional credibility.

The Reading League connection. The IDA works closely with The Reading League, another nonprofit focused on educator training in the science of reading. If your school's teachers have gone through Reading League training, that is a good sign structured literacy concepts are being taken seriously.

Advocate training. Some IDA branches offer parent advocacy workshops, free or low-cost. These teach you how IEP processes work, what to request in writing, and how to document a school's response. If your branch offers one, go.

If you are early in figuring out what is happening with your child, ReadFlare's free reading tools can help you get a baseline picture of phonological awareness and sight word recognition before you request a formal school evaluation. Having your own data, even informal data, going into a school meeting changes the dynamic.

What is the IDA's stance on reading curricula and the science of reading movement?

The IDA has been explicit since at least the late 1990s that reading instruction must rest on the convergent evidence from cognitive neuroscience, educational psychology, and linguistics. This body of evidence is now widely called the "science of reading," a term that has grown from a research framework into a policy movement.

The IDA co-published the "Structured Literacy" framework that lays out the essential parts of evidence-based reading instruction: phonology, sound-symbol correspondence, syllable instruction, morphology, syntax, and semantics, taught explicitly and systematically. ^[4] This stands against balanced literacy programs that treat decoding as one of several "cueing systems" alongside context and picture cues, an approach the reading science does not support for struggling readers.

The IDA does not publish a list of approved or banned curricula by name, but its accreditation standards and its Knowledge and Practice Standards work as a filter. A reading program that does not teach the six syllable types, does not include phoneme-grapheme correspondence in a systematic sequence, and does not address morphology is unlikely to meet IDA's standards, whatever the publisher claims.

For parents trying to judge what their child is being taught, the IDA's Knowledge and Practice Standards document (free at dyslexiaida.org) is one of the most useful things you can read. It tells you exactly what a trained teacher should know, and you can use it as a checklist when talking to your child's school.

Does the IDA cover conditions beyond dyslexia?

The IDA's main focus is dyslexia, but it addresses related conditions closely because they so often co-occur.

Dyscalculia (sometimes called number dyslexia) affects math processing and shows up in an estimated 5 to 7 percent of the population. ADHD co-occurs with dyslexia in roughly 25 to 40 percent of cases, depending on the study. Dysgraphia, a disorder of written expression, often travels with dyslexia because both involve phonological and orthographic processing.

The IDA's fact sheets cover several of these co-occurring conditions, and its structured literacy framework handles writing and spelling alongside reading because they share the same underlying linguistic architecture. A child with both dyslexia and dysgraphia needs intervention that addresses the full profile, more than reading fluency.

For parents worried about whether their child has a learning disability beyond dyslexia specifically, the IDA recommends a full psychoeducational evaluation that assesses the whole profile, not a narrow reading-only screen. That is also what IDEA requires for an initial special education eligibility determination. ^[8]

How do IDA credentials and certifications work for educators and tutors?

The IDA recognizes several credentials that signal structured literacy training, though it does not grant all of them directly. Here is the landscape as it stands.

Credential	Granting body	What it means	Approx. training required
CALT (Certified Academic Language Therapist)	ALTA	Orton-Gillingham-based, includes supervised practice	200+ hours instruction, 700+ practicum hours
Fellow/Associate of ALTA	ALTA	Advanced CALT level	Additional years of practice
CERI/CEDS (IDA's own credentials)	IDA	Knowledge of structured literacy; reading educator/specialist	Varies by level; exam-based
Wilson Certified Practitioner	Wilson Language Group	Wilson Reading System specifically	~40 hours, supervised
Barton Tutor certification	Barton Reading	Barton system specifically	Self-paced training

The IDA has its own credentialing program (CERI, Certified Dyslexia Educator/Researcher; CEDS, Certified Dyslexia Education Specialist) built around knowledge of the science of reading and structured literacy. ^[1] These are exam-based and require demonstrated knowledge of linguistics and reading science.

If you are hiring a private tutor, any of the credentials in the table above beats no credential. The most intensive training (CALT) also tends to cost more per hour, roughly $80 to $150 depending on geography, versus $40 to $80 for a less credentialed tutor. Whether the extra cost buys meaningfully better outcomes for your specific child is genuinely unclear from the research. The closest data suggests credentialed programs produce better outcomes on average, but individual tutor quality varies enormously within credential categories. Ask for a sample lesson plan, and ask the tutor to explain how they would sequence instruction for your child.

What should parents ask their child's school based on IDA guidance?

Walking into a school meeting with the right questions changes the dynamic faster than any single piece of paperwork.

Here are the questions the IDA's framework suggests, in plain language:

1. What screening tool does this school use in kindergarten and first grade, and when was your child screened? Schools in states with dyslexia screening laws must screen all students; ask to see the results.

2. If the school is providing intervention, is it a structured literacy approach? Can you name the specific program or describe the sequence of instruction?

3. What training does the interventionist have? Do they hold any structured literacy credentials?

4. How is progress measured, how often, and what does the data show?

5. If progress is insufficient, what is the school's next step?

If you are requesting an evaluation, put it in writing, date it, and keep a copy. Under IDEA, once you request an evaluation in writing, the school must respond with either consent to evaluate or a written explanation of why it is refusing. ^[8] If the school refuses, you have the right to challenge that refusal through a due process complaint or a state complaint. ^[8]

For help building your advocacy binder, the ReadFlare parent advocacy kit has templates for evaluation request letters and IEP meeting preparation checklists that line up with the IDA's guidance and IDEA requirements.

Is the IDA the right resource if you speak Spanish or your child was evaluated in another language?

The IDA has made some progress on multilingual resources, but this is an area where it is honest about its gaps. The dyslexia definition and the structured literacy framework carry across languages because phonological processing deficits are cross-linguistic, but the specific instructional sequences differ depending on a language's orthography. Spanish has a much more transparent orthography than English, meaning the phoneme-grapheme rules are more consistent, so students tend to decode Spanish more easily but may still show dyslexic patterns in fluency and reading comprehension.

Some IDA branches have Spanish-language materials and bilingual staff. The IDA fact sheet on bilingual children and dyslexia is worth downloading if this is your situation. ^[1] For a Spanish-language overview of the diagnostic process, our article on dyslexia examen covers the evaluation process in Spanish.

The broader principle from the IDA is that bilingualism does not cause dyslexia, and that a child who struggles to read in both their home language and English is more likely showing a phonological processing deficit than a language confusion issue. Schools sometimes wrongly chalk up reading struggles in English language learners to the language acquisition process itself, which delays identification of dyslexia by months or years. If you believe that is happening, IDEA gives you the same evaluation rights regardless of the child's language background. ^[8]

Frequently asked questions

Is the International Dyslexia Association a government agency?

No. The IDA is a private nonprofit founded in 1949. It has no regulatory authority. But its definition of dyslexia and its structured literacy standards have been adopted in the laws of more than 43 states and referenced by federal agencies including the NIH, so its influence on policy is substantial even though it is not a government body.

Can the IDA help me find a tutor for my child?

Yes, indirectly. The IDA's roughly 40 U.S. branches each keep referral directories of vetted tutors, educational therapists, and clinicians in their region. Search the IDA website for your nearest branch, then contact them for a local referral list. The IDA also lists accredited programs, which can help you identify tutors trained in IDA-recognized structured literacy approaches.

What does the IDA say about Orton-Gillingham?

Orton-Gillingham (OG) is the founding structured literacy approach and is closely tied to the IDA's history. The IDA endorses structured literacy as an approach rather than OG specifically, and notes that many programs are OG-based or OG-influenced. Research supports structured literacy broadly; the evidence that any single branded OG program beats the others is limited, though all share the core principles the IDA standards require.

Does the IDA support the use of audiobooks or text-to-speech for children with dyslexia?

Yes. The IDA's fact sheets on accommodations back text-to-speech tools and audiobooks as appropriate accommodations that reduce barriers to content access while a student builds decoding skills. These tools are not a substitute for structured literacy instruction; the goal is to keep a student's academic knowledge growing while their reading mechanics catch up.

What age does dyslexia usually become apparent?

Signs can appear in preschool as phonological awareness delays, but most children are identified in kindergarten through second grade when formal reading instruction begins. The IDA recommends universal screening starting in kindergarten. Older children and adults can also be identified; it is never too late to intervene, though earlier intervention produces larger gains relative to peers.

How is the IDA different from the Learning Disabilities Association of America?

The IDA focuses specifically on dyslexia and language-based learning disabilities, with a strong emphasis on reading science and structured literacy instruction. The Learning Disabilities Association of America (LDA) covers the broader spectrum of learning disabilities including dysgraphia, dyscalculia, and ADHD. Both are useful advocacy organizations; they complement each other rather than compete.

Does the IDA have resources for teachers, more than parents?

Yes, and teacher resources are arguably the IDA's core output. The Knowledge and Practice Standards for Teachers of Reading, the structured literacy overview documents, and the IDA's credentialing programs (CERI, CEDS) all aim at educators. The IDA also accredits university teacher preparation programs and maintains a list of accredited programs on its website.

What is the IDA's position on dyslexia fonts like OpenDyslexic?

The IDA does not endorse any typeface as a dyslexia treatment. Research on specialized fonts is mixed; a 2013 study published in PLoS ONE found OpenDyslexic offered no reading speed advantage over standard fonts. The IDA's position is that font modifications may be tried as low-cost accommodations but should not replace structured literacy instruction. See our article on dyslexia fonts for a fuller review.

How does the IDA's dyslexia definition affect what schools are legally required to do?

When a state's dyslexia law adopts the IDA definition, schools must screen for and address the specific deficits it names, particularly phonological processing and decoding. Under IDEA, schools must provide a free appropriate public education for students with dyslexia classified under Specific Learning Disability. The IDA definition strengthens parent arguments that generic reading support does not satisfy the law if it fails to target phonological processing.

Can a child be diagnosed with dyslexia by the IDA?

No. The IDA does not diagnose individuals. Diagnosis is done by licensed psychologists, educational psychologists, neuropsychologists, or school evaluation teams. The IDA sets the definition evaluators use and publishes guidance on what a full evaluation should include, but the actual assessment and diagnosis is the job of a qualified clinician or a school evaluation team under IDEA.

What does 'structured literacy' mean exactly and where did the term come from?

The IDA coined and defined the term 'structured literacy' to describe explicit, systematic instruction in phonology, phoneme-grapheme correspondences, syllable patterns, morphology, syntax, and text structure. It covers Orton-Gillingham and all OG-based programs. The defining features are that instruction is direct (not discovery-based), systematic (follows a logical sequence), sequential (builds on prior learning), and cumulative.

How much does an IDA-accredited structured literacy tutor cost?

Private structured literacy tutors with IDA-recognized credentials generally charge $60 to $150 per hour in the United States, varying by credential level and region. Less credentialed tutors may charge $30 to $60. Some IDA branches offer subsidized or sliding-scale tutoring through university clinics. School-funded services under an IEP are at no cost to families, which is usually the first option to pursue.

Is dyslexia the same as a reading disorder in the DSM-5?

Largely yes. The DSM-5 classifies dyslexia under 'Specific Learning Disorder with impairment in reading.' The IDA definition and the DSM-5 criteria overlap heavily, both citing persistent reading difficulties not explained by other factors. The IDA definition is more specific about phonological processing as a core mechanism. For school eligibility, IDEA uses the category 'Specific Learning Disability,' which covers both.

Does the IDA have a position on whole-language or balanced literacy programs?

Yes, clearly. The IDA's structured literacy standards are incompatible with whole-language instruction, which treats context and meaning cues as primary routes to word recognition. The IDA and its affiliated researchers have consistently argued that the three-cueing system central to balanced literacy programs lacks scientific support for struggling readers and may actually reinforce avoidance of phonological decoding.

Sources

1. International Dyslexia Association, About IDA: IDA is headquartered in Baltimore, has approximately 40 U.S. branches, publishes free fact sheets, and maintains a credentialing program for educators.
2. International Dyslexia Association, Definition of Dyslexia (adopted by NICHD): "Dyslexia is a specific learning disability that is neurobiological in origin. It is characterized by difficulties with accurate and/or fluent word recognition and by poor spelling and decoding abilities." Affects 15-20% of the population; describes the Matthew Effect.
3. National Center on Improving Literacy, State Dyslexia Laws: More than 43 states have incorporated the IDA definition or similar language into their dyslexia statutes; more than 37 states have passed dyslexia screening laws.
4. International Dyslexia Association, Knowledge and Practice Standards for Teachers of Reading (2018): IDA's Knowledge and Practice Standards define structured literacy as explicit, systematic instruction in phonology, orthography, morphology, syntax, semantics, and text structure; the IDA coined the term 'structured literacy.'
5. National Council on Teacher Quality, Teacher Prep Review 2023: Only about 23 percent of teacher preparation programs adequately covered the science of reading as of 2023.
6. Shaywitz, S.E. et al., Connecticut Longitudinal Study, Journal of the American Medical Association, 1990: Large-scale longitudinal research found reading difficulties distributed along a normal curve, with prevalence data supporting the 15-20% figure; foundational epidemiological evidence for dyslexia.
7. Stevens, E.A. et al., 'A Synthesis of Phonics and Fluency Instruction on Reading Outcomes for Students with Reading Disabilities,' Reading and Writing, 2022: Meta-analysis found structured literacy interventions produced a weighted mean effect size of 0.51 on word reading for students with dyslexia.
8. Individuals with Disabilities Education Act, 20 U.S.C. § 1414 (U.S. Department of Education): IDEA requires schools to provide FAPE; parents may request a full evaluation at any time; schools must respond within 60 days of written evaluation request; dyslexia is served under the Specific Learning Disability category.
9. U.S. Department of Education, Office of Special Education Programs (OSEP), Dear Colleague Letter on Dyslexia, 2015: OSEP clarified that schools may use the word 'dyslexia' in IEPs and evaluations and that IDEA applies to students with dyslexia; RTI may not be used to delay formal evaluation.
10. Rello, L. & Baeza-Yates, R., 'Good Fonts for Dyslexia,' ACM ASSETS 2013 / PLoS ONE: Research on specialized dyslexia fonts such as OpenDyslexic found no significant reading speed advantage over standard fonts.
11. National Institute of Child Health and Human Development, Report of the National Reading Panel, 2000: National Reading Panel synthesized evidence showing structured literacy intervention is most effective in kindergarten through second grade, though it produces gains at any age.
12. American Psychiatric Association, DSM-5: Diagnostic and Statistical Manual of Mental Disorders (5th ed.): DSM-5 classifies dyslexia under Specific Learning Disorder with impairment in reading; criteria overlap substantially with the IDA definition.
13. U.S. Department of Education, Section 504 of the Rehabilitation Act, Office for Civil Rights: Section 504 of the Rehabilitation Act provides accommodations for students with disabilities who do not qualify for an IEP, including extended time and assistive technology.