The $800 Million Black Box: How i-Ready Hides Your Students From You
Second in the series. Post 1 covered the 50-year experiment: double the real spending, +7 points on a 500-point scale. This one is about the product where a third of the money goes, and the trick it pulls on the people standing in the classroom.
Roughly 13 to 14 million American students use i-Ready. That is about one in three elementary and middle schoolers, across 70% of the top-100 school districts, generating $750-800 million a year for Curriculum Associates, a private equity-backed company in Boston. Nine of the ten largest districts in the country run it. More than 90% of districts renew.
If you are a superintendent, that paragraph sounds like a success story. It is the most renewed, most adopted, most dashboard-friendly product in American education.
Here is the part that should end the conversation: there is no randomized controlled trial of i-Ready. None. Fifteen years. Thirteen million kids. Zero.
That is not my finding. It is the finding of Jared Cooney Horvath, a neuroscientist who went looking for the evidence base in 2026 and published the audit: zero RCTs, zero articles in first or second tier peer-reviewed journals. Two lower-tier studies, one of which found i-Ready diagnostics are less predictive than the state tests schools already give, and the other measured improvement only inside i-Ready itself. The rest is gray literature: vendor reports, white papers, dissertations.
The Johns Hopkins studies you may have heard about? Both were conducted in partnership with Curriculum Associates, and neither was peer-reviewed. The reading study found no statistically significant effect. The math study found users improved 7.8% against 7.0% for non-users, across 7,646 students, at roughly $70 per student. That is over $535,000 spent for a difference of less than one percentage point. In medicine we call that statistically detectable but clinically meaningless. In education, it got a research library.
Now do the math on the whole product. Curriculum Associates' own 2025 report, using data from all 14 million of its users, shows 60% of eighth graders below grade level in math, worse than 2019. The company has a 90% renewal rate. The outcomes and the renewals are both real. Only one of them is about learning.
The part nobody talks about: what the teacher sees.
The deeper failure is not the missing evidence. It is what the product hides.
Formative assessment is one of the best-documented drivers of learning in all of education research. Dylan Wiliam's work over three decades is unambiguous about why it works: not because students get feedback, but because the assessment gives the TEACHER information. The teacher sees the wrong answers, reads the misconceptions, and changes tomorrow's lesson. Assessment is formative only when it changes what the teacher does.
i-Ready inverts this. The adaptive system decides which questions to ask, delivers the feedback, and sequences the lessons. The teacher sees summary metrics on a dashboard. Not the questions. Not the student's answers. Not the misconception the student carries. In NBC News' national reporting on the i-Ready backlash, that was the recurring teacher complaint: they cannot see what their students actually did.
So the most powerful mechanism in learning research, information flowing to a professional who can act on it, is removed. What remains is activity. Abundant, measurable, dashboard-ready activity. Horvath's words: "abundant activity, but little learning."
Meanwhile the diagnostics themselves eat instruction. Directors report losing three to six weeks of class time per year to i-Ready assessments. A district administrator in West Virginia reprimanded a teacher whose students weren't logging enough i-Ready minutes. The metric became the job.
Follow the money and the design makes sense. Curriculum Associates employs dozens of in-house data and psychometrics scientists producing a steady stream of self-evaluations. The company has never run the gold-standard trial because, as its own leaders told NBC News, it would be too expensive and they do not plan to do one. The studies it does fund, through fee-for-service university centers, run on i-Ready's own black-box data, which no independent researcher can audit. When WestEd and the Gates Foundation found in 2018 that "causal conclusions about the impact of i-Ready cannot be made," Curriculum Associates' research library summarized the same report as students demonstrating significant improvement.
You cannot audit the data, you cannot see the student's work, and the company funds its own proof. The teacher, the one professional with eyes on the child, is the last to know.
There is a better use of the same money, and the federal government just said so out loud.
A new GAO report this spring found that more than two-thirds of teachers consider collaborating with other educators the most useful professional development they get, and collaboration is more strongly linked to student achievement than any workshop model. The Department of Education's guidance letter now directs districts toward exactly that: team teaching, collaborative planning, job-embedded learning.
That is the opposite of i-Ready in every dimension. i-Ready isolates: 25 students on 25 screens, 25 unrelated lessons, one teacher proctoring. Collaboration connects: teachers looking at real student work together, in the context of the kids they actually share.
Here is the budget math a school board can act on. Los Angeles signed a $20 million, five-year i-Ready contract. The federal government sends districts $2.2 billion a year in Title II funds specifically for teacher development. Every dollar of an i-Ready license is a dollar that cannot hire a master teacher to lead a team, pay a stipend for collaborative planning time, or fund the mentoring structures the research actually supports.
And this is not theoretical. This is what we build at Math Success. Our DMT Insights are free: research translated for classroom use, including two that dig into exactly this question, what screens do to young mathematical thinking ("From Screens to Sense making," November 2025, and "Mathematical Thinking in the Age of Digital Dependence," June 2026). The cognitive science is clear that young children build mathematical understanding through physical construction, drawing, and conversation, not through clicking. Cognitive load research going back decades explains why: the mental work that builds lasting understanding cannot be outsourced to a cartoon.
Our professional development puts that science in the teacher's head, where it compounds. A license expires every year. Knowledge in a teacher's head teaches children for a career.
i-Ready sells data about learning as a substitute for learning. The district gets a dashboard. The teacher gets a proctoring script. The kid gets a cartoon. The company gets $800 million a year.
Ask your district three questions: Is there a randomized controlled trial? Can teachers see what students actually did? Who funded the studies that say it works?
If the answers are no, no, and the vendor, you already know.
Do the math. Follow the money.
Sources
- Horvath, J.C., "i-Ready: 13 Million Students, Zero Meaningful Evidence," Substack, March 30, 2026 (evidence audit: zero RCTs, zero Q1/Q2 journal articles, Johns Hopkins study details)
- Wooden, J.A., "i-Ready: the Ed-Tech Snake Oil Making Kids Dumber," Epostasy/UnHerd, March 24, 2026 (company financials, Stretch Growth circularity, teacher reprimand, science-washing, privacy class action)
- Kingkade, T., "The revolt against i-Ready," NBC News, May 12, 2026 (LAUSD audit, teacher "black box" complaints, no RCT planned, 90% renewal, CA response)
- Sparks, S.D., "Teachers Like It. Research Is Promising. Is This the Solution to Teacher PD?" Education Week, April 3, 2026 (GAO report, Title II funding, ED guidance letter)
- WestEd/Gates Foundation evaluation (2018), as described in source 2
- DMTI, "From Screens to Sense making: What are We Missing?" (Nov 14, 2025) and "Mathematical Thinking in The Age of Digital Dependence" (Jun 15, 2026), Math Success Insights
- NCES data on achievement trends: NAEP Long-Term Trend 2023; Curriculum Associates "State of Student Learning 2025" (grade 8: 60% below grade level)
Every claim above traces to a public source. Corrections with sources are welcome and will be noted.