Reading Program Evidence Ratings: Five Systems, Five Questions
You have a student who is not making progress, a program you are being asked to justify, and a parent who has read that the program is "evidence-based." So you go looking for reading program evidence ratings, and you find five public systems that appear to answer the question. None of them does.
That is not a criticism of any of the five. Each one says clearly what it rates. The problem is that no two of them rate the same thing, four of the five rate a document rather than a program, and in three of the five the publisher decides whether its program appears on the list at all.
This piece walks through what each system actually measures, in its own published words, verified against its own pages on 30 September 2026. It does not tell you which program to use. Nothing here is legal advice.
The five systems, and the five different questions they answer
Practitioners tend to treat these as five views of one underlying fact. They are not. Here is what each one is built to answer.
The What Works Clearinghouse asks: how good is the research on this intervention? Its unit of analysis is the study, not the program.
The NCII Academic Intervention Tools Chart asks: how rigorous were the studies a developer chose to submit, and how large were the effects in them?
Evidence for ESSA asks: does this program have research that maps onto the federal evidence tiers?
EdReports asks: is this curriculum designed well against a set of educator-built indicators?
The Reading League's Curriculum Evaluation Guidelines and Curriculum Navigation Reports ask: does this curriculum contain instructional practices that are not aligned with the reading research?
Five systems. A study, a submission, a tier, a design, an alignment. Not one of them rates whether the program will move the student sitting in front of you, and none of them claims to.
If you want the prior question — what "evidence-based" means when six different bodies use the phrase — that is covered separately in is educational therapy evidence-based. This piece is about the five registries themselves.
The What Works Clearinghouse rates studies, and the study is the unit
The WWC's own description of its purpose is narrow and worth reading literally. Its handbooks page states that the purpose is "to review and summarize the quality of existing research in educational programs, products, practices, and policies."
The unit of analysis is the study
The operative words are "existing research." The WWC does not evaluate a program. It evaluates whether the studies about a program were designed well enough to support a causal claim, and then summarises what those studies found.
The current rulebook is the WWC Procedures and Standards Handbook, Version 5.0, dated August 2022 and revised December 2022. Every prior version back to Version 1.0 in May 2008 is still posted alongside it, which matters: a study reviewed under Version 4.1 was judged against different rules from one reviewed under 5.0.
Four product types, routinely confused
The WWC publishes four distinct product types, and mixing them up is the most common mistake practitioners make with it. Its Find What Works page lists them: practice guides are "evidence-based recommendations for educators to improve student outcomes" — the reading one most often quoted at practitioners is Foundational Skills to Support Reading for Understanding in Kindergarten Through 3rd Grade.
The other three are narrower. Intervention reports are "summaries of findings of the highest-quality research on a given intervention or practice in education"; reviews of individual studies are "summaries of individual studies that have been reviewed by the WWC"; and data from study reviews are downloadable datasets.
A practice guide recommends a practice. An intervention report summarises the research on a named program. They are not interchangeable, and a program named nowhere in either is not thereby a program that failed a review.
One limitation to state plainly
The WWC's intervention-report index could not be enumerated by an automated fetcher on 30 September 2026 — three separate attempts at its publication and search endpoints returned server errors.
So this piece makes no claim about how many intervention reports exist, or about which named programs do and do not have one. If that question is load-bearing for you, search the WWC site directly rather than relying on any secondary summary of it, including this one.
The NCII chart says, in its own words, that it does not rate the interventions
The Academic Intervention Tools Chart published by the National Center on Intensive Intervention is the list most likely to be quoted at a practitioner, and it is the one whose own disclaimers are most routinely dropped.
Four sentences from the chart's own introduction do most of the work:
"The chart includes information and ratings on the quality of research studies about different interventions, not ratings on the interventions themselves. The ratings are about study quality only."
"The presence of a particular tool on the chart does not constitute endorsement and should not be viewed as a recommendation."
"All tools that meet the criteria for review are posted on the chart, regardless of results. The chart represents all tools that were reviewed, not those that were 'approved.'"
So a program on the chart is not an approved program. It is a program about which somebody submitted a study.
The submission is the mechanism
The chart's effect-size documentation states it directly: "Developers of programs on the chart were asked to submit the necessary data to compute the effect sizes." Where a developer cannot supply adjusted posttest means, NCII will calculate from unadjusted posttests under stated conditions. Where the necessary data are absent altogether, the effect-size cell carries a dash.
The rating scheme itself is a bubble, and it is a rating of design. A full bubble on a group-design study requires random assignment, pretreatment equivalence within 0.25 standard deviations on covariates and demographics, no attrition bias, and a unit of analysis matching the unit of randomisation.
A half bubble covers randomised studies failing one of those conditions, or a strong quasi-experimental design meeting the equivalence and adjustment conditions. An empty bubble is everything else.
Effect sizes are computed by NCII itself, not taken from the paper: Hedges g corrected for small-sample bias, following WWC guidance, with 0.25 flagged as the threshold the WWC treats as "substantively important."
The column nobody reads
The column nobody reads is the most honest thing on the chart. One column is headed "Other Research Potentially Eligible for NCII Review," and the chart defines it as the number of studies that are "potentially eligible for NCII review, but have not been reviewed." A program can therefore sit on the chart with one reviewed study and a double-digit count of eligible, unreviewed ones.
NCII also publishes a separate Taxonomy of Intervention Intensity for judging whether an intervention is intense enough for a given student, and an overview of what each of its charts covers — its progress-monitoring and screening charts are separate instruments with their own standards.
There is also a column recording whether the intervention or study was reviewed by the WWC or by Evidence for ESSA — which is the chart telling you, on its own face, that it is one of several systems and not the system.
A staleness note that changes how you should read it. As of 30 September 2026 the chart's own introductory panel carries the line "Last updated: September 2021." Read that as published, not as a judgement: it is what the page says. A 2021 snapshot of a vendor-submitted evidence base is a reasonable thing to consult and an unreasonable thing to treat as current.
Evidence for ESSA maps programs onto three labels, and says it has no official status
Evidence for ESSA is produced by the Center for Research and Reform in Education at Johns Hopkins University School of Education. Its purpose, in its own words, is to provide "a free, authoritative, user-centered database to help anyone" find programs "that align to the ESSA evidence standards."
Its three rating labels are Strong, Moderate and Promising. As of 30 September 2026 its reading listing carried 113 programs — 47 rated Strong, 23 Moderate and 43 Promising. Fifty-eight of the 113 are tagged as designed for struggling readers and 42 are tagged for special education.
And then, on its Who We Are page, the sentence that should be printed on the inside of every clearinghouse:
"It is information solely intended to be useful to educators and the public and has no official status."
The site names the people who built it, including the late Robert Slavin, and names its funders. The same group also runs a second clearinghouse, ProvenTutoring, and the Best Evidence Encyclopedia, which is worth knowing when you meet a rating and want to know whose rating it is.
The tiers themselves are a funding standard written for schools and districts. They govern how certain federal dollars may be spent by entities that receive them. They are not a rule about what a private practitioner may use, may claim, or must document.
If you are contracting with a district and a tier is written into the agreement, that is a question for the district's counsel and yours, not for a blog post.
EdReports rates design, and says so when asked directly
EdReports publishes the most explicit answer to the question practitioners actually have, and it is an answer in the negative. Its FAQ carries the heading "Why do EdReports reviews focus on how materials are designed rather than on their effectiveness?" The answer:
"This makes it extremely difficult to prove the effectiveness of any single program across multiple contexts... EdReports reviews focus on how materials are designed rather than the various ways they might be used in practice."
That is a registry telling you, in its own FAQ, that effectiveness is not what it measures.
The scope limit is the part that matters to a private practice
Its report library is free and searchable, which is not in dispute; the question is what is in it. EdReports reviews "core, year-long, Pre-K-12 materials in English language arts (ELA), math, and science, as well as K-2 ELA foundational skills supplements." And then: "We also review standalone supplemental K-2 foundational skills materials, but we do not currently review any other types of supplemental K-12 materials."
Read that against a caseload. A Tier 3 intervention delivered to one student twice a week is, in EdReports' taxonomy, a supplemental K-12 material. It is out of scope by design. Its absence from EdReports is not a finding about the program; it is a fact about what EdReports reviews.
The process is educator-led and the publisher has defined rights in it. Per the process page, reviews take four to six months with reviewers spending at least five to ten hours a week; teams reach consensus indicator by indicator.
Publishers are invited to give an hour-long orientation to the review team, may answer clarifying questions, receive an embargoed draft and may submit counterevidence that goes back to the team, and may post two documents on the site after publication — a response to the report and a background or research document, each capped at 1,500 words.
Reviews are staged into two or three gateways. A program must clear the first to be reviewed in the next, and where it did not proceed it is labelled "not eligible" (NE) for that gateway. An NE is therefore not a low score on that gateway. It is the absence of a score.
Two of its own pages disagree
The process page says EdReports "purchases all materials directly from the publisher of the program." The FAQ says it requests "temporary access to materials from publishers — at no cost for digital formats or, when necessary, at a nominal fee to cover actual printing costs."
Both pages were live on 30 September 2026. The substance is the same in the sense that materials come from publishers and no gifts are accepted; the mechanism is described two different ways, and neither page acknowledges the other.
And the reports do not get re-scored. EdReports states that it "does not retroactively update completed reports as a result of revising our review tools," and that "each report reflects a specific point in time." In the same FAQ it describes its version 2.0 tools as including "significant enhancements to ELA criteria to ensure stronger alignment with the science of reading and structured literacy practices."
Put those two sentences next to each other. An older ELA report on the site was scored against criteria EdReports itself has since strengthened for science-of-reading alignment, and it has not been rescored. EdReports says as much and publishes guidance on how to read its earlier reports.
The trap is not the policy; the trap is comparing a v1.0 report and a v2.0 report as though they were the same instrument. This is the same problem as reading two achievement test qualification levels from two storefronts as though the letters meant one thing.
The Reading League rates alignment, and publishes the list of publishers who said no
The Curriculum Evaluation Guidelines are not a registry at all. They are a rubric you apply yourself, and their stated purpose is negative: for Tier I materials, "it is essential to ensure they do not include instructional practices that are not aligned with the scientific evidence base of how children learn to read." The guidelines exist "to highlight any non-aligned practices, or 'red flags.'"
The components reviewed follow Scarborough's reading rope — word recognition, split into phonological and phonemic awareness and phonics and phonic decoding; language comprehension, split into background knowledge, vocabulary, knowledge of language structures, verbal reasoning and literacy knowledge — plus fluency, writing, reading comprehension and assessment.
The guidelines have been through an interrater reliability study conducted by Matthew Burns, and The Reading League's own definition of the science of reading is the frame they are built on.
The guidelines have been through an interrater reliability study conducted by Matthew Burns, and The Reading League's own definition of the science of reading is the frame they are built on. The Reading League's own definition of the science of reading is the frame the guidelines are built on.
Because many decision-makers "lacked the time, resources, and/or knowledge" to run a full review, The Reading League also assembled expert teams and published Curriculum Navigation Reports applying the guidelines to named, widely used programs.
As of 30 September 2026 the reports on the Compass curriculum decision-makers page include Amplify CKLA in two editions, HMH Into Reading in three, McGraw Hill Wonders, SRA Open Court, myView Literacy, Benchmark Advance, Bookworms, Superkids, Reading Mastery Transformations, Saxon Reading Foundations, UFLI Foundations, PAF, 95 Phonics Core Program, Really Great Reading, Reading Horizons Discovery, Reading Simplified, Fundations, Foundations A-Z and others.
Most carry a publisher's response alongside them, and each is a downloadable narrative rather than a score — the reports on Fundations, UFLI Foundations and the 95 Phonics Core Program are representative.
The framing is explicit and repeated:
"TRL does not recommend curricula, so there is no mechanism for passing or failing."
"There is no perfect curriculum."
The reports are to be read alongside state-standards alignment, usability, and "efficacy according to published research studies on the program" — that is, alongside the other four systems in this piece.
The declined list
Under the heading "Publishers Who Declined Review or Did Not Respond," The Reading League names them and dates the refusals: From Phonics to Reading (declined 2024); Heinemann's Fountas & Pinnell (did not respond 2023, declined 2024 and 2025); Heinemann's Units of Study (did not respond 2023, declined 2024 and 2025); Jolly Phonics (declined 2024); and Wit & Wisdom (declined indefinitely).
That list is the honest answer to a question the other four systems leave implicit: who decides whether a program gets reviewed. Here, the publisher does, and the consequence of saying no is published.
One edition wrinkle, bounded by date. On 30 September 2026 The Reading League's main resource page offers the Curriculum Evaluation Guidelines (4th Edition), while the Compass page's history section says the tool "was later updated to the Curriculum Evaluation Guidelines (3rd Edition) in 2026" and separately links a 3rd Edition PDF. Both pages were live. Check the edition on the file you actually download before you cite a red flag from it.
And a limitation on this piece. The full text of the guidelines sits behind a name-and-email form. This article therefore quotes The Reading League's published description of the guidelines and their structure, and does not quote or paraphrase any individual red-flag statement, because those could not be verified from a publicly readable page. If a specific red flag matters to your decision, download the current edition yourself.
The higher label on the lower effect size
This is the example that should change how you read a tier, and it comes from two pages of one site.
Two entries, side by side
On 30 September 2026, Evidence for ESSA's entry for Leveled Literacy Intervention reads: evidence rating strong, grades proven K-2, 2 studies, 566 students, average effect size +0.13. Its provider line reads "Fountas & Pinnell Literacy, published by Heinemann" — the program's own pages sit with Fountas & Pinnell Literacy and with Heinemann.
The entry for the Wilson Reading System reads: evidence rating promising, grades proven 3 and 5, 1 study, 158 students, average effect size +0.17. Wilson's own description of the Wilson Reading System covers a far wider grade range than the entry's two grades.
So the program carrying the higher label has the smaller average effect size, and the program carrying the lower label has the larger one.
Why that is not an error
It is not an inconsistency, and the site explains it on the page. The Wilson entry states the reason for its category directly: "Based on these outcomes, with less than 350 students, Wilson Reading System qualified for the 'Promising' category." Sample size and design, not effect magnitude, put a program in a tier.
Which is the whole lesson. A tier label is a statement about how the evidence was produced. It is not a measure of how much the program moved anybody, and treating it as one inverts the two numbers in this example.
The two effect sizes are also not comparable with each other. They come from different measures, different samples and different grade bands, and nothing here ranks one program above the other.
Read the entries and you get the detail that makes them usable. LLI's +0.13 is the average of two studies: +0.17 across five DIBELS scales in rural and suburban Georgia and New York, and +0.10 on the DRA2 in Denver, where the positive result was in kindergarten and not in first or second grade.
Wilson's +0.17 comes from one Pittsburgh-area study with significant effects on Woodcock Word Attack at +0.46 and Word Identification at +0.15, and, in the site's own words, "no significant impacts on other measures of reading, including state test scores."
That is four paragraphs of useful information sitting behind two one-word labels, and none of it is visible from the label.
And the same publisher appears on a second list, for the opposite reason
Heinemann's Fountas & Pinnell did not respond to The Reading League's review request in 2023 and declined in 2024 and 2025. So there is no Curriculum Navigation Report on its materials.
Both facts were true on the same day: the top ESSA-tier label on one site, a dated declined entry on another. Neither contradicts the other, because the two systems are not answering the same question. One reports what the research design and results support under the federal tiers. The other reports whether the materials contain practices the reading research does not support, and it cannot report anything at all without the materials.
A practitioner who consults only the first sees a top rating. A practitioner who consults only the second sees a name on a declined list. Both are reading their system correctly. Neither has the whole picture, and the site that would give it to them does not exist.
One more pairing, because it settles an old question
IMSE's Orton-Gillingham Plus is rated Moderate at K-3 by Evidence for ESSA, and IMSE's Morphology+ is rated Promising at grade 3. So an Orton-Gillingham-lineage program does appear in the tiers — under one vendor's brand, for that vendor's materials and that vendor's studies.
It is not a rating of the approach. No registry rates an approach, because an approach has no publisher to submit a study and no materials to send to a review team. That is the same finding as what "Orton-Gillingham based" actually means, arrived at from the registry side.
Wilson's Tier 1 program, Fundations, does have a Curriculum Navigation Report. The Wilson Reading System does not. For the program-by-program comparison underneath all of this, see reading intervention programs compared.
Who decides whether a program is on the list
Sort the five systems by that question and they fall into three groups.
The publisher decides. NCII's effect sizes come from data "developers of programs on the chart were asked to submit." The Reading League's Navigation Reports require the publisher to "send K-5 materials directly to the review teams," and it publishes the names of those who declined. Evidence for ESSA's listings depend on evaluations of the program existing and being locatable, which in practice depends heavily on who commissioned and published them.
The reviewer decides. EdReports states that it "identifies the core set of materials," is "guided by the long-term goal of... reviewing as close as possible to 100% of the ELA, math, and science market," and is in regular contact with publishers about readiness for review. Publishers get orientation, clarifying questions, counterevidence and a published response — real procedural rights — but not the decision about whether a review happens.
The literature decides. The WWC reviews existing research against its handbook. If nobody has run an eligible study, there is nothing for it to review, and no amount of publisher cooperation changes that.
Three different gatekeepers. That is why the five lists have such different contents, and it is a better explanation of any given absence than "the program did not measure up."
What a blank entry actually means
Take the four reasons a program can be missing from any of these systems and none of them is a finding about the program.
Out of scope. It is a supplemental K-12 intervention and the registry reviews core curricula. This is most private-practice programs and EdReports.
Not submitted. The developer did not send data, or the publisher declined the materials. This is NCII and the Navigation Reports.
Not studied to standard. Studies exist but none meets the design standards, or none exists at all. This is the WWC.
Not yet reached. The registry has not got to it, or the list has not been updated. This is the NCII chart's own 2021 date and EdReports' review queue.
The honest sentence to give a parent or a school is therefore not "there is no evidence for this program." It is: this program does not appear on this list, here is the reason the list gives, and here is what I monitor instead. Which brings us to the part you actually control.
Progress monitoring is the only instrument that answers your question
None of the five systems rates the program-student match. Your own data is the only thing that does. That is not a rhetorical flourish; it is what the registries themselves keep pointing at when they decline to recommend.
The Reading League says it outright: curriculum alone will not ensure success, "inclusion of a component does not mean the curriculum provides sufficient practice," and materials should be checked for "continual deliberate practice (spaced review, corrective feedback, etc.) to mastery." EdReports says materials "must be implemented with integrity in order to benefit students, and there are myriad factors beyond the scope of a curriculum that impact both its implementation and impact."
So the registries decide what goes on the shelf. You decide what happens to one student, and you find out by measuring. The tool choices and their licensing terms are in progress monitoring tools compared, and the reason a grade equivalent is the wrong metric for this is in grade equivalent scores.
Two practical cautions. A comprehension score from one instrument will not agree with a comprehension score from another, for reasons set out in reading comprehension assessment tools. And a published program's dosage specification is a fidelity requirement, not a minimum effective dose, which is the distinction drawn in intervention session frequency and duration.
The grade band is the part practitioners skip
Every rating in these systems is bounded by the population that was studied, and the listing usually says so in small type next to the label.
Evidence for ESSA's reading entries carry a grade range that is the range of the rated evaluations, not the range the publisher markets. Wilson Reading System's entry reads grades 3 and 5, while UFLI Foundations and other widely used programs carry their own narrow bands. Corrective Reading reads grades 3 and 5. Spell Read reads grades 3 and 5. Lindamood Phoneme Sequencing reads K-2.
If your student is fourteen, a Promising rating derived from third and fifth graders is not a finding about your student. It is a finding about third and fifth graders, and the honest move is to say so rather than to borrow the label.
The same logic runs through the NCII chart, where each row is a study with its own sample, and through the WWC, whose intervention reports are bounded by the studies that met standards. This is the same reasoning that governs reading a psychoeducational evaluation: the number means what the sample it came from means.
The Tier 3 blind spot, stated plainly
Look at what the Strong tier of Evidence for ESSA's reading list is actually made of. On 30 September 2026 its highest-rated reading entries are dominated by whole-school reform models, structured tutoring delivery models and technology platforms: Success for All, BARR, Sound Partners, Reading Recovery, Reading Corps, Reading Partners, Chapter One, Future Forward Literacy, READ 180, Leveled Literacy Intervention, Journeys and the 95 Phonics Core Program.
Those are programs a district buys. Several are staffing models rather than curricula. The thing an independent practitioner is most likely to be holding — a multisensory structured language program delivered one-to-one by a trained interventionist — is largely absent from that tier, and the reason is not that anyone rated it poorly.
It is that this kind of program is rarely the subject of the large randomised trials the tiers reward, and its publishers are rarely the ones commissioning them.
Which means the evidentiary asset in a private practice is not the program's tier. It is the training behind the hands delivering it, and the documentation of what happened to the student. The training routes and what they cost in hours are compared in structured literacy training programs compared, the alignment claims behind them in the IDA Knowledge and Practice Standards, and the supervised-hours arithmetic in educational therapy supervision requirements.
A sequence, not a decision
What follows is an order of operations, not a recommendation. No list in this piece, and no combination of them, will tell you which program to use.
Establish what you are choosing. A core curriculum, a supplemental intervention and a delivery model are three different objects, and they are reviewed by three different subsets of these five systems.
Check scope before you check ratings. If the object is a supplemental K-12 intervention, EdReports is out of scope and silence there carries no information.
Read the rating's unit. On NCII you are reading a study; on Evidence for ESSA a tier derived from evaluations; on EdReports a design judgement; on a Navigation Report an alignment narrative.
Read the grade band and the sample before the label.
Check the date on the list and the version of the instrument. NCII's chart states September 2021; EdReports reports are point-in-time and not rescored; Navigation Reports specify the publication year of the materials reviewed.
Look for the publisher's response. EdReports and the Navigation Reports both publish them. They are short, and they tell you what the publisher thinks the review got wrong.
Ask why an absence is an absence using the four reasons above, and write the reason down rather than the conclusion.
Decide on the student, and then monitor. The registries got you to a defensible shortlist. They cannot get you further.
This is the same shape as the decision sequence in math assessment tools for dyscalculia and in executive function curricula compared: the sequence is transferable, the decision is not.
What none of the five will tell you
It is worth being blunt about the questions that have no registry.
Whether a program suits a student with this profile, at this age, at this frequency.
Whether your training is sufficient to deliver it as designed. That is a professional-competence question, and the AET Code of Ethics puts it on you rather than on the publisher.
Whether a program works when delivered once a week instead of the specified schedule.
Whether two programs can be combined.
Whether a rating from 2021 still describes the product a publisher is selling in 2026.
None of those is a gap in the registries' work. They are questions about a single case, and a registry is not a case-level instrument.
That is the point where your treatment plan takes over — see how to write an educational therapy treatment plan — and the point where the distinction between an educational therapist, a learning specialist and a coach starts to matter, which is mapped in educational therapist vs learning specialist vs EF coach and in what is educational therapy.
Where the published record runs out
Five gaps, named, so you know what this piece could not verify on 30 September 2026.
The WWC's intervention-report inventory. Three endpoint attempts returned server errors, so no claim is made here about which programs have intervention reports or how many exist. Search the WWC directly.
The text of the Curriculum Evaluation Guidelines. Behind a name-and-email form. No individual red flag is quoted in this piece for that reason, and the current edition number is itself inconsistent across two Reading League pages.
The NCII chart's current contents. The chart body is a dynamic table that truncates when fetched, and its own panel reads "Last updated: September 2021." Program-level claims from it should be read off the live chart, not from any summary.
Evidence for ESSA's per-program evidence. The reading listing is the index; each label resolves to a page like the IMSE Orton-Gillingham Plus entry. The counts and labels reported here come from the site's own reading listing on 30 September 2026. The underlying study for any single entry has to be read on that entry's page.
EdReports' material-acquisition mechanism. Two of its own pages describe it differently, as set out above, and neither reconciles with the other.
Saying all of that is not hedging. A practitioner who cites a rating they have not read on the live source is one publisher update away from being wrong in front of a family.
Frequently asked questions
Is a program on the NCII tools chart an approved program?
No, and the chart says so. Its introduction states that the ratings "are about study quality only," that presence on the chart "does not constitute endorsement and should not be viewed as a recommendation," and that the chart "represents all tools that were reviewed, not those that were 'approved.'"
Why is my structured literacy program not on EdReports?
Almost certainly because it is out of scope. EdReports reviews core, year-long Pre-K-12 ELA, math and science materials plus standalone K-2 ELA foundational skills supplements, and states that it does "not currently review any other types of supplemental K-12 materials." A supplemental intervention is not reviewed, so its absence carries no information about quality.
Does a Strong rating on Evidence for ESSA mean a program is better than one rated Promising?
It means the research supporting it maps onto a higher federal evidence tier, for the grades and populations that were studied. It is a statement about the evaluations, not a head-to-head comparison of the programs, and Evidence for ESSA itself states that the site "has no official status." Read the grade band on the entry before carrying the label across to a different student.
Why does The Reading League have no report on some well-known programs?
Because the review requires the publisher to supply materials. The Reading League publishes a dated list of publishers who declined or did not respond, which as of 30 September 2026 named From Phonics to Reading, Heinemann's Fountas & Pinnell, Heinemann's Units of Study, Jolly Phonics and Wit & Wisdom. A missing report can mean the publisher said no.
Can I tell a parent a program is evidence-based because it is on one of these lists?
You can tell them precisely what the list says, which list it is, what that list rates, and what date it carries. That is more useful than the phrase and considerably more defensible. The broader question of what the phrase means across bodies is covered in our piece on whether educational therapy is evidence-based.
Does a higher tier label mean a bigger effect?
No. On 30 September 2026, Evidence for ESSA listed Leveled Literacy Intervention as Strong with an average effect size of +0.13 across two studies and 566 students, and the Wilson Reading System as Promising with an average effect size of +0.17 from one study of 158 students.
The site explains the Wilson category on its own page: "with less than 350 students, Wilson Reading System qualified for the 'Promising' category." Tiers encode design and sample size. The two effect sizes are not comparable with each other in any case, and nothing here ranks the programs.
Which of the five should I check first?
Whichever matches the object you are choosing. Core curriculum: EdReports and a Navigation Report. Supplemental intervention: the NCII chart and Evidence for ESSA. A practice rather than a product: a WWC practice guide. Then check the date and the grade band on whatever you found, and monitor the student regardless.
The same problem, in five other places
Every one of these findings is a version of one problem: a single word is doing work that several different systems have defined differently, and nobody reconciles them. It shows up across the whole field.
The label on a program is not adjudicated by anyone, which is why "Orton-Gillingham based" means whatever its user means by it — see reading intervention programs compared.
In mathematics there is no equivalent ecosystem to argue about at all: no body accredits math intervention curricula, as set out in math intervention for dyscalculia.
In writing, the instruments split along a definitional fault line rather than a quality one, which is the subject of dysgraphia and writing intervention tools and of written expression assessment tools.
In cognitive training, the disagreement is entirely about how far an improvement must travel before it counts — the near-transfer and far-transfer split in working memory training programs.
And in credentials, the same word means a different unit at every issuing body, which is what learning specialist certification and educational therapy continuing education are both about.
Noticing the pattern is most of the defence against it. Ask what the word is a measurement of, and who did the measuring, before you accept the number attached to it.
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