Orton-Gillingham Based: What the Label Actually Means
Updated: Sep 9
You have been asked which Orton-Gillingham training to do, and you have a shortlist. Every program on it says it is Orton-Gillingham. One says it is based on Orton-Gillingham principles. One says it is Orton-Gillingham influenced. One says it delivers the rigor of Orton-Gillingham instruction without the training burden. Two of the best-regarded programs in the field do not use the phrase at all.
None of that variation is accidental, and none of it is regulated.
"Orton-Gillingham based" is a claim that no organisation adjudicates. There is no body that certifies a curriculum as Orton-Gillingham, no published standard a program must meet before using the name, and no register you can check. The Academy that carries the name in its own title says plainly that Orton-Gillingham is not a program at all. Meanwhile a dozen programs are sold as Orton-Gillingham programs, and several of them are excellent.
This is a map of what the primary sources actually publish: what the Academy says the approach is, who accredits what, how each publisher words its claim, what the research says about the category as a whole, and — at the end — every place where the published record simply runs out.
The label is not gated. That does not make it meaningless. It makes it your job to check, and this piece is about what there is to check against.
The Academy says Orton-Gillingham is not a program
Start with the organisation that owns the name in its title. The Academy of Orton-Gillingham Practitioners and Educators now brands itself the Orton-Gillingham Academy, or OGA, though the legal name is unchanged and both appear across the site. It was founded in 1995 and states it has "over 4,000 national and international members who have met its standards".
Its definitional page is unambiguous.
"The Orton-Gillingham Approach is a direct, explicit, multisensory, structured, sequential, diagnostic, and prescriptive way to teach literacy to individuals for whom reading, writing, and spelling do not come easily, such as those with dyslexia. It is most properly understood and practiced as an approach rather than a method, program, or system."
That is from What is the Orton-Gillingham Approach?. The Academy makes the same distinction more explicitly in its FAQs, where it defines the difference in so many words.
"A program is a plan, schedule or procedure to be followed to a specified end. An OG program follows a set scope and sequence. An approach is the means adapted to tackling an issue. Orton-Gillingham is an instructional approach. It is most properly understood and practiced as an approach, not a method, program, system or technique."
And it says what that means for its own practice, on What Makes OGA Different: "We do not follow a rigid scope and sequence; instead, we provide flexibility and honor the seminal works of the Orton-Gillingham Approach."
The corollary matters more than the definition. If the approach is defined by being diagnostic and prescriptive — designed lesson by lesson around one learner — then a fixed scope and sequence is not the approach.
It is a product built on the approach. The Academy's own framing is that instruction "is always focused upon the learning needs of the individual student", with practitioners designing lessons and materials at the student's current level.
Hold that thought. Several publishers agree with it in print, which is not what most practitioners expect.
The adjective list you have probably seen is not the Academy's
Here is a correction worth making, because the wrong version is everywhere in training slide decks and blog posts.
Orton-Gillingham is routinely described as "language-based, multisensory, structured, sequential, cumulative, cognitive, and flexible." That formulation, in that order, does not appear on the Orton-Gillingham Academy's site. It was not found on the definitional page, the principles page, either FAQ page, or anywhere else on the Academy's public pages as of 31 August 2026.
The Academy's own inline list is different: "direct, explicit, multisensory, structured, sequential, diagnostic, and prescriptive." Note what the popular version drops — diagnostic and prescriptive, which are precisely the two words that make the approach incompatible with a fixed sequence.
The vocabulary in the popular version is not invented. It closely tracks the headings on orton-gillingham.com, which is a commercial training company's site, not the Academy's. The Academy does publish the underlying ideas, but as nine separately headed Principles of the OG Approach: Diagnostic and Prescriptive; Individualized; Language-Based and Alphabetic/Phonetic; Simultaneous Multisensory; Direct and Explicit; Structured, Sequential, and Cumulative, but Flexible; Synthetic and Analytic; Cognitive; and Emotionally Sound.
If you are quoting the Academy, quote the Academy. If you are quoting the seven-adjective list, you are quoting a training vendor.
One of the Academy's levels has been renamed, and the rollout is unfinished
A second correction, smaller but likely to trip you up in an application.
The Academy's certification tiers are now Classroom Educator, Associate, Clinical and Fellow, plus a Subscriber membership that is not a certification. The page for the third tier is titled "Clinical Level (formerly Certified)" — though the URL still ends in "certified-level", and "Certified" survives in body copy on the Fellow page, the training information page, the FAQs, and one entry on the accredited-programs list.
The Subscriber caveat is worth quoting in full, because it is the level most often misrepresented on a résumé. From the introductory level page: "Subscriber Members are not certified by the OGA to teach or tutor students in the OG Approach." The Academy describes the Subscriber as "an informed consumer," not a practitioner.
The structural fact underneath all of this is the one that explains the accreditation picture later in this piece. Fellows are the only members who may train and supervise. From the Fellow level page: "The Fellow practitioner follows the standards described in the Curriculum Handbook and the Fellow Handbook to train, supervise, and mentor trainees through the OGA application process at all levels of certification."
And in the negative, from the training information page: "The Associate practitioner is not certified to provide OGA training or supervision," and "The Certified Level practitioner is not qualified to provide independent OGA training or practicum supervision."
The Academy is explicit about why it works this way: "Because the training is done by Fellows, the Academy does not train; it only certifies and accredits, eliminating the conflict of interest that arises when training and certification are handled by the same organization."
That is a real structural argument, and it is one of the few places in this field where a body separates training from certification on purpose. It is worth setting beside the continuing education landscape, where the opposite arrangement — the certifying body also selling the hours — is common.
Nobody publishes a rule for who may use the name
This is the finding that took the longest to establish, because establishing an absence takes longer than finding a sentence.
The Academy's public site runs to 88 pages in its own sitemap. As of 31 August 2026 there is no terms-of-use page, no trademark or intellectual-property notice, and no published statement addressing "OG-based," "OG-influenced" or "OG-inspired" claims.
No trademark or registered symbol appears in the text of the definitional page, the principles page, the level pages, the certification overview, the accreditation pages or any of the FAQ pages. The site footer carries a bare copyright line and nothing else.
The nearest thing the Academy publishes is a quality caveat on its find a teacher or tutor page, and it is worth reading precisely.
"There has been a notable increase in the number of people who represent themselves as Orton-Gillingham trained. Unfortunately, just as in the case of training programs, the quality and adequacy of preparation and experience of such people vary significantly. However, membership in the Academy provides an objective, professional assessment by an independent third party as to the quality and the extent of the preparation and experience of Academy members."
Read what that is and is not. It is a warning about variability and a positive case for the Academy's own credential. It names no one, prohibits nothing, and asserts no ownership of the term.
The International Dyslexia Association does not fill the gap either. Its flagship definitional document, the Structured Literacy fact sheet dated July 2024, makes the same approach-versus-program distinction the Academy makes.
"Going deeper, Structured Literacy is an instructional approach, not a program. However, to deliver this comprehensive instruction, educators often systematically integrate one or more programs."
But the words "Orton" and "Gillingham" do not appear anywhere in that fact sheet. IDA's central document on Structured Literacy is silent on Orton-Gillingham entirely, so it cannot be cited as IDA adjudicating the relationship between the approach, the umbrella term and the branded programs. It adjudicates only approach versus program.
The one IDA page that does address the relationship is Structured Literacy: A New Term to Unify Us and Sell What We Do, by Hal Malchow, published in July 2014. It says the new umbrella term "is not designed to replace Orton Gillingham, Multi-Sensory or other terms in common use," and describes it as "an umbrella term designed to describe all of the programs that teach reading in essentially the same way."
Treat that carefully. It is a twelve-year-old advocacy piece with an openly commercial framing — the title says "sell what we do" — and it is not a standards document. It is not a rule about who may use the Orton-Gillingham name, and nothing else on IDA's public site is either.
No organisation publishes a standard a curriculum must meet before calling itself Orton-Gillingham. That is not a scandal. It is a fact about the field, and it changes what a claim on a brochure is worth.
What the public trademark record shows, and what it does not
Nothing here is legal advice. What follows is a description of what is printed on public United States Patent and Trademark Office records, read on the USPTO's own status pages. It is not a trademark opinion, and if the answer matters commercially — you are naming a training course, say — it is a question for an intellectual property attorney, not for a blog.
With that stated, the record is interesting.
The Academy holds two live registrations, both for the composite ORTON-GILLINGHAM ACADEMY rather than for "Orton-Gillingham" standing alone. The word mark is Serial 98020775, Registration 7666401, registered 28 January 2025, with the word ACADEMY disclaimed. The design mark is Serial 98020479, with ACADEMY and FOUNDED 1995 disclaimed. An older registration for the full organisational name, Serial 75020123, is recorded as cancelled.
More telling are two third-party registrations in which the USPTO required the applicant to disclaim the term itself. In Serial 78489032, a now-cancelled registration, the disclaimer reads "ORTON-GILLINGHAM." In Serial 85431083, also cancelled, the disclaimer reads "THE ORTON-GILLINGHAM APPROACH." A third-party application at Serial 97141034 is recorded as refused.
Separately, an application to register STRUCTURED LITERACY, Serial 88217414, was filed on 5 December 2018 and went abandoned on 10 September 2019 after the applicant failed to respond to an office action.
Now the limitation, stated plainly. The USPTO's current search interface sits behind a bot challenge and could not be queried exhaustively from an automated session. Each record above was read individually on the USPTO's status pages, but the full register was not searched.
So the honest form of the finding is this: no registration for "Orton-Gillingham" standing alone was located, and in the third-party registrations reviewed the term had to be disclaimed. Anything stronger than that — that the term is generic, that it is in the public domain, that nobody owns it — is a legal conclusion these records do not supply.
One more caveat: the applicant's identity on the abandoned STRUCTURED LITERACY application could not be confirmed from the primary record, because USPTO status pages for abandoned applications do not print an owner field. The filing date and the abandonment date are solid. The applicant is not, and is deliberately not named here.
Eleven publishers, and no two claims alike
Here is the part that is genuinely useful at a training-decision meeting. Every quotation below was read on the publisher's own site on 31 August 2026, not on a reseller's page or a blog. The differences in wording are not marketing noise. They are the closest thing the field has to a disclosure regime.
Wilson Reading System — "The Tier 3 Structured Literacy program is based on phonological-coding research and Orton-Gillingham principles." (program page)
Barton Reading & Spelling System — the phrase appears as a badge, "Orton-Gillingham Influenced," and in the corporate footer as part of the product descriptor. (the Barton system)
S.P.I.R.E. — "SPIRE 4E is a Structured Literacy program grounded in the Orton-Gillingham approach," and elsewhere "an Orton-Gillingham based reading intervention program." (SPIRE 4E)
Imagine Sonday System — "delivers the rigor of Orton-Gillingham instruction without the traditional implementation burden," under the heading "Orton-Gillingham that works in real classrooms." (Imagine Learning)
Take Flight — "derived from Orton Gillingham principles of instruction," and this appears on a clinical research page, not on the program page.
Recipe for Reading — "a multisensory, Orton-Gillingham based program," which appears in a research PDF on the publisher's domain but not on the product page.
Project Read — "The phonics section of the program is based on the Orton – Gillingham method," which is a narrower claim than any other here, scoped to one section of the curriculum. (who we are)
Slingerland — "the first whole-classroom adaptation of the Orton-Gillingham method," and elsewhere "Expands on Orton-Gillingham principles." (FAQs)
Neuhaus Education Center — "Grounded in the Orton-Gillingham approach and the science of reading." (get certified)
LiPS — no Orton-Gillingham claim. The string does not appear on the LiPS program page, the Gander Publishing home page, its FAQs or its about page, as of 31 August 2026.
Spalding — no Orton-Gillingham claim. The string does not appear on the home page, the Spalding Method, the Writing Road to Reading, history, courses or certification, as of 31 August 2026.
Wilson argues the distinction itself, in print
The most interesting thing Wilson publishes on this subject is not a claim but an argument. It maintains a dedicated FAQ, Orton-Gillingham and Wilson Reading System: What You Need to Know, which makes exactly the distinction the Academy makes.
"An approach is a way of thinking about how to address an issue. A program is a course of action that applies the principles of an approach. WRS is a structured literacy program that applies the principles of the O-G approach."
Its companion PDF puts it in one line: "Orton-Gillingham is an approach to instruction. WRS is a program based on this approach."
That is a publisher declining to claim more than it can support, and then framing the fixed scope and sequence as the value it adds rather than as a compromise. Whatever you think of the program, the disclosure is exemplary. Wilson's other pages use the softer register consistently — its dyslexia and training page says its programs are "aligned to Orton-Gillingham (O-G) principles of instruction."
Barton says "influenced," and the word is doing work
Barton never says its system is Orton-Gillingham, and never says it is based on Orton-Gillingham. It says influenced, and it uses that word in its corporate footer, which is where a company puts the descriptor it is prepared to stand behind everywhere.
Barton also describes what it does in its own vocabulary: "Our system is a multi-sensory, direct, explicit, structured and sequential program designed for intense intervention." That is a claim about instructional design, not about lineage, and it is verifiable against the product in a way that a lineage claim is not.
Small detail, easy to miss: Barton renders it "Orton-Gillingham" in the badge and "Orton Gillingham" unhyphenated in the body copy on the same page. Take Flight does the same. The field is not consistent even about the hyphen.
The strongest personal Orton lineage makes the fewest Orton-Gillingham claims
This is the finding that most changes how the label should be read.
Spalding makes no Orton-Gillingham claim anywhere on its public site — not on the method page, not in its own research PDF, which contains no occurrence of either surname. What Spalding does claim is direct personal training.
Its history page records that Romalda Spalding "sought guidance and training from the distinguished neurologist Dr. Samuel T. Orton," that she "tutored children under Dr. Orton's supervision," and that she served on the Council of Advisors of the Orton Dyslexia Society.
So the program with arguably the most direct line to Orton the man declines to use the Orton-Gillingham brand, while programs with no such line use it freely. The label tracks marketing decisions, not lineage. Once you have seen that, a brochure claim stops being evidence of anything much.
Absence of the phrase tells you nothing about a program. Presence of the phrase tells you almost as little. What tells you something is the training route behind it, and that is on a different set of pages.
Three accreditation lists, and they barely overlap
If no one certifies curricula as Orton-Gillingham, what do the accrediting bodies actually accredit? Three published lists matter, and each accredits a different kind of object.
The Orton-Gillingham Academy accredits training programs at named sites. Its accreditation overview states the scope twice: "The Academy does not accredit the school or organization; it only accredits the Orton-Gillingham Instructional and/or Training Program."
Accreditation runs at two levels, Associate and Clinical, and the gate is severe: the program must have operated for three years, "the instructional leadership of the program be vested in a staff member who is a Fellow of the Academy," and at least five applicants must have applied to the Certifying Committee with an eighty per cent acceptance rate. The process "takes a minimum of a year to complete."
Its list of accredited training programs held 20 sites as of 31 August 2026, and every one is a school, clinic, camp or institute — the Blosser Center, Camperdown Academy, Commonwealth Learning Center, Kildonan Teacher Training Institute, the Stern Center, the Schenck School and so on.
No named commercial reading curriculum appears on that list. Wilson, Barton, S.P.I.R.E., Sonday, Take Flight and LiPS were each searched for in the page text and the raw HTML and none was found, as of 31 August 2026.
That is not a judgement on any of them. It follows mechanically from the Fellow-leadership requirement: the Academy accredits training routes led by its own Fellows, and a commercial publisher's training department is not that.
IMSLEC accredits training courses, and its directory held 57 accredited organisations as of 31 August 2026. Scottish Rite for Children's dyslexia therapist training course is on it at Therapy and Instructor of Therapy level, and Take Flight is also the named curriculum of several other accredited sites.
Slingerland is on it at Teaching and Instructor of Teaching level. Spalding is on it. Neuhaus is on it at both levels, the only one of the eleven programs in this piece to hold that.
IDA accredits educator preparation programs, and its list showed 58 organisations. IDA's accreditation resources set out the two tiers, and the dividing line is a practicum: standard Accreditation covers preparation for whole-group and small-group instruction with at least 45 clock hours, while Accreditation Plus covers preparation to deliver targeted or intensive intervention and requires at least one supervised Structured Literacy practicum.
Wilson Language Training holds Accreditation Plus for its Level I and Level II certifications. Neuhaus holds Accreditation Plus for its online certificate program.
So the lists sort like this. Neuhaus appears on IMSLEC at both levels and on IDA at Accreditation Plus. Wilson appears on IDA at Accreditation Plus only. Slingerland, Spalding and Scottish Rite appear on IMSLEC only. Barton, S.P.I.R.E., Sonday, LiPS, Recipe for Reading and Project Read were not found on any of the three.
And here is the wrinkle that undoes any attempt to treat these as three independent verdicts: IMSLEC itself, and the Orton-Gillingham Academy itself, both appear on IDA's accredited list. The bodies are partly nested rather than independent, so "accredited by two of the three" does not mean what it sounds like it means.
This is the same shape as two findings already documented on this site. In executive function assessment, three publishers use "Level B" to mean three different bars. In continuing education, a CE hour is not a portable currency. Here, three bodies use the word "accredited" for three different objects. When several organisations share a vocabulary, check whether they share a meaning. They usually do not.
What the evidence says about Orton-Gillingham as a category
The branded programs have their own evidence records, and the program-by-program comparison on this site sets out what the What Works Clearinghouse found for Wilson, Barton, LiPS, Read Naturally and Corrective Reading individually. This section is about something different: what the research says about Orton-Gillingham as a category, unbranded.
The answer is that the category has been studied and the studies have not been good enough to support a conclusion. That is not the same as the approach not working, and the sources are unusually careful to say so.
The What Works Clearinghouse reviewed it in 2010 and could conclude nothing. Its intervention report, Orton-Gillingham-based Strategies (Unbranded), dated July 2010, is still live and has not been superseded. The full report states that it identified 31 studies published between 1989 and 2009 and that "None of the 31 studies meet WWC evidence standards with or without reservations."
Its conclusion sentence deserves quoting whole, because truncating it changes its meaning.
"The lack of studies meeting WWC evidence standards means that, at this time, the WWC is unable to draw any conclusions based on research about the effectiveness or ineffectiveness of unbranded Orton-Gillingham-based strategies for students with learning disabilities."
Effectiveness or ineffectiveness. That is a statement about the absence of qualifying evidence, not a negative verdict.
A 2006 literature review reached a similar place from the other direction. Ritchey and Goeke's Orton-Gillingham and Orton-Gillingham-Based Reading Instruction: A Review of the Literature, in The Journal of Special Education 40(3), 171–183, reviewed twelve studies.
It reported a mean effect size of 0.82 for word attack and non-word reading and 0.76 for comprehension — and then concluded: "Given the small number of studies, the lack of methodological rigor of the existing studies, and the inconclusive findings of the effectiveness of OG programs, additional research is needed before the scientific basis can be established."
Those two facts belong in the same sentence whenever you cite this paper. The effect sizes are positive and they come from studies the authors judged methodologically weak. Reporting either half alone misleads.
The most recent meta-analysis is from 2021 and it is the one to know. Stevens, Austin, Moore, Scammacca, Boucher and Vaughn, Current State of the Evidence: Examining the Effects of Orton-Gillingham Reading Interventions for Students With or at Risk for Word-Level Reading Disabilities, Exceptional Children 87(4), 397–417, identified 24 studies and meta-analysed 16. The full text is free via ERIC and PubMed Central.
Its findings, in the authors' words: Orton-Gillingham interventions "do not statistically significantly improve foundational skill outcomes (i.e., phonological awareness, phonics, fluency, spelling; effect size [ES] = 0.22; p = .40), although the mean ES was positive in favor of Orton-Gillingham-based approaches." For vocabulary and comprehension the weighted mean effect size was 0.14, p = .59.
And then the sentence that should accompany every citation of it.
"The findings from this meta-analysis do not definitively prove that OG interventions are not impactful for students with dyslexia. In addition, we are not suggesting that other reading programs are more effective than OG. Instead, findings from this meta-analysis indicate that we do not yet know the answers to these questions."
The inclusion criterion is the whole argument
Buried in the same paper is the most damning evidence that the label has no shared meaning, and it is methodological rather than rhetorical.
To meta-analyse a category you must first decide what belongs in it. Stevens and colleagues had no objective standard available, so they used the only one there was. Their rule, verbatim: "We required authors to self-identify instruction as OG (i.e., the authors identified the intervention as OG instruction in the manuscript) to be included in this review as an unbranded intervention."
A research team at a major university, working on a peer-reviewed meta-analysis, could do no better than take the study authors' word for it.
The paper says why. "More recently, non-OG programs have adopted many of the descriptors or characteristics of the OG approach (direct, explicit, structured, sequential, diagnostic, and prescriptive word-reading instruction), and therefore OG and non-OG programs have overlapping characteristics." And on the multisensory component specifically: "There is little consensus in the field around how we define and operationalize multisensory reading instruction."
The What Works Clearinghouse ran into the same problem in 2010 and solved it the same clumsy way, by creating an "unbranded" bucket for "interventions that are based on general 'Orton-Gillingham' principles and interventions that combine multiple branded products based on 'Orton-Gillingham' principles." You only need that taxonomy when the label spans things that are not alike.
No more recent meta-analysis or systematic review of Orton-Gillingham as a category was located as of 31 August 2026. Stevens et al. (2021) remains the current state of the evidence, five years on.
Where the strong evidence actually sits
It sits on practices. The IES practice guide Providing Reading Interventions for Students in Grades 4–9, March 2022, remains current and rates three of its four recommendations Strong: build decoding skills for multisyllabic words, provide purposeful fluency-building activities, and routinely use a set of comprehension-building practices. The fourth, on stretch text, is rated Moderate.
Every one of those is phrased as an instructional practice, and the guide declines to endorse products: "Any references within the document to specific education products are illustrative and do not imply endorsement of these products to the exclusion of other products that are not referenced."
To be precise about what is source and what is inference — that disclaimer is a non-endorsement statement, not an affirmative claim by IES that evidence attaches to practices rather than programs. The observation that its recommendations are all written as practices is ours, drawn from reading them. It is a reasonable reading. It is not a quotation.
What this changes about choosing a training route
None of the above tells you which program to train in, and this piece is not going to. What it changes is the order of the questions.
The claim on the brochure is the last thing to look at, not the first. Here is a sequence that uses what the sources actually publish.
Start with the practicum, not the curriculum. Every route in this field that is taken seriously by an accrediting body has supervised practice attached. IDA's Accreditation Plus tier turns on it. The Academy's levels turn on it. Ask how many supervised hours, over what period, observed how many times, and by whom.
Ask who supervises, and what that person is certified to do. The Academy is explicit that Associate and Clinical practitioners may not train or supervise independently, and that only Fellows may. Other bodies have their own answer. Get the answer in writing.
Check the three lists yourself, and check which list. A program on IMSLEC's directory has an accredited course. A program on IDA's list has an accredited preparation program, at one of two tiers. A site on the Academy's list has an accredited training program led by a Fellow. These are not interchangeable and a marketing page will not distinguish them.
Decide whether you want a fixed sequence or a diagnostic route, and say so out loud. This is the real fork, and both answers are defensible. A fixed scope and sequence gives you consistency, transferability and a manual. A diagnostic and prescriptive route gives you flexibility and asks much more of your judgement. The Academy defines the approach as the second thing. Several publishers openly sell the first and explain why.
Treat absence from a list as a question, not a verdict. Excellent programs sit on none of the three, because accreditation is a route the publisher has to choose to pursue and pay for. Absence tells you to ask what the training route is, not that the program is weak.
Read the exact claim wording. "Influenced," "based on principles," "grounded in," "derived from" and "delivers the rigor of" are five different assertions. A publisher that hedges precisely is usually a publisher that has thought about it.
If you are earlier in the pathway than this and still mapping the credential landscape, the educational therapist, learning specialist and executive function coach comparison sets out the wider terrain, and how to become an educational therapist covers the AET ladder specifically. The same title-without-a-standard problem shows up in learning specialist certification, where the job title itself turns out to be unprotected.
The math side of this has no adjudicator either, and no accreditor. If you also carry math referrals, what “math intervention” and “dyscalculia” actually name applies the same analysis to a field with no Academy, no accreditation lists at all, and no organisation that certifies anybody it did not also train.
Where the published record runs out
The most useful thing a piece like this can do is be honest about its own edges. Here is every gap encountered while researching it, so you know exactly which claims above are load-bearing and which are bounded.
The USPTO register was not searched exhaustively. The current search interface sits behind a bot challenge. Individual records were read on the USPTO's own status pages; the register as a whole was not queried. No claim is made that nobody holds a bare "Orton-Gillingham" registration.
The applicant on the abandoned STRUCTURED LITERACY application is not named here, because USPTO status pages for abandoned applications do not print an owner field and the identity could not be confirmed from the primary record.
IDA's accredited-programs list could not be machine-read. The site returns an error to automated clients. The figure of 58 is IDA's own stated total, read from the rendered page; a full name enumeration returned only 52 rows. If that count is load-bearing for you, open the page and count it yourself.
projectread.com is in poor technical health. It failed a TLS handshake from two independent clients on 31 August 2026, and its plain HTTP address returns a parked-domain redirect. The quotation above was retrieved through one rendering path and could not be corroborated by a second. Verify it before relying on it.
No IDA fact sheet specifically on the Orton-Gillingham approach was confirmed to exist or not exist. IDA's public fact-sheet index now redirects readers to a library requiring registration, so the catalogue could not be enumerated.
The Academy's own published hour totals for the Fellow level disagree with each other across two of its pages. No hour totals are asserted here for that reason. If you are applying, ask the Academy directly which figure governs.
The historical wording of the Academy's definition was not checked. Web archive services were unreachable during research, so the correction above about the seven-adjective list is bounded to the live site as of 31 August 2026 and says nothing about what the Academy may have published previously.
The Slingerland comparison table was read from the page's underlying data rather than the rendered layout, because the page loads it dynamically. The quoted text is exact; the visual presentation was not confirmed.
That list is longer than most articles would admit to. It is also the reason the rest of it can be relied on.
Frequently asked questions
Is Wilson an Orton-Gillingham program?
Wilson describes the Wilson Reading System as "based on phonological-coding research and Orton-Gillingham principles," and publishes a dedicated FAQ arguing that Orton-Gillingham is an approach while WRS is a program that applies it. No organisation certifies curricula as Orton-Gillingham, so there is no external body that can answer this question with a yes or a no. Wilson Language Training does hold IDA Accreditation Plus for its Level I and Level II certifications.
Who decides whether a program can call itself Orton-Gillingham?
Nobody, as far as the published record shows. The Orton-Gillingham Academy publishes a definition of the approach and accredits training programs led by its Fellows, but publishes no terms of use, no trademark notice and no statement about "OG-based" claims among the 88 pages in its public sitemap as of 31 August 2026. IDA's Structured Literacy fact sheet does not mention Orton-Gillingham at all.
What is the difference between Orton-Gillingham and Structured Literacy?
They are answers to different questions. The Orton-Gillingham Academy defines Orton-Gillingham as a diagnostic and prescriptive instructional approach with a specific training lineage. IDA defines Structured Literacy as an umbrella instructional approach, stating that it "is not a program, but teachers may integrate a combination of programs to build an effective SL curriculum." IDA's fact sheet does not describe the relationship between the two terms.
Does the research show Orton-Gillingham works?
The research does not currently support a conclusion either way for the category as a whole. The What Works Clearinghouse reviewed 31 studies of unbranded Orton-Gillingham strategies in 2010, found none met its evidence standards, and stated it was unable to draw conclusions about "effectiveness or ineffectiveness."
The most recent meta-analysis, Stevens et al. (2021), found effect sizes of 0.22 for foundational skills and 0.14 for comprehension, neither statistically significant, and the authors state explicitly that this does not prove the interventions are not impactful.
Which accreditation should I look for in a training program?
That depends on what you want the credential to authorise, and the three bodies accredit different objects. IMSLEC accredits training courses. IDA accredits educator preparation programs at two tiers, with a supervised practicum as the dividing line for the higher tier. The Orton-Gillingham Academy accredits training programs at sites whose instructional leadership is an Academy Fellow. Check which list a program is on before treating its accreditation as comparable to another's.
Is "Orton-Gillingham" a trademark?
The Orton-Gillingham Academy holds live United States registrations for ORTON-GILLINGHAM ACADEMY as a composite mark, not for the term standing alone, and in two third-party registrations reviewed the USPTO required the applicant to disclaim "ORTON-GILLINGHAM" or "THE ORTON-GILLINGHAM APPROACH."
No registration for the bare term was located, but the register could not be searched exhaustively. This is a description of public records, not a trademark opinion, and a commercial question about naming belongs with an intellectual property attorney.
Working in this field?
Illuminate maintains a network of educational therapists, learning specialists and executive function coaches, and matches students to practitioners by need rather than by postcode. If you want to be on the list, join the educator network here.
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