Research Studies

The first randomized controlled trial of a virtual tutoring program for reading was conducted during the 2022-23 school year at a large charter school network in Texas. Kindergarten, first and second graders received 20 minutes of video tutoring four times a week, from September through May, with an early reading tutoring organization called OnYourMark. Despite the logistical challenges of setting up little children on computers with headphones, the tutored children ended the year with higher DIBELS scores, a measure of reading proficiency for young children, than students who didn’t receive the tutoring. One-to-one video tutoring sometimes produced double the reading gains as video tutoring in pairs, demonstrating a difference between online and in-person tutoring, where larger groups of two and three students can be very effective too. That study was published in October 2023. 


This paper presents the results from a randomized controlled trial of Chapter One, an early elementary reading tutoring program that embeds part-time tutors into the classroom to provide short bursts of 1:1 instruction. Eligible kindergarten students were randomly assigned to receive supplementary tutoring during the 2021-22 school year (N=818). The study occurred in a large Southeastern district serving predominantly Black and Hispanic students. Students assigned to the program were over two times more likely to reach the program’s target reading level by the end of kindergarten (70% vs. 32%). The results were largely homogenous across student populations and extended to district-administered assessments. These findings provide promising evidence of an affordable and sustainable approach for delivering personalized reading tutoring at scale.


Susanna Loeb is named to the 2024 RHSU Edu-Scholar Public Influence Rankings, recognizing the 200 university-based scholars who had the biggest influence on educational practice and policy last year.

For the full list and to learn more about the rankings, visit The 2024 RHSU Edu-Scholar Public Influence Rankings.


High-dosage tutoring programs have expanded significantly, with nearly 40 percent of schools now using individual and small-group tutoring with trained teachers or tutors four or five days a week. This approach has been shown to boost student learning, but it can also be expensive. A new study by the National Student Support Accelerator at Stanford University suggests virtual tutoring could be a less-costly option, if it remains as intensive and rigorous as in-person tutoring.


"We're pretty clear on the big picture about what makes tutoring work, and it is focused on intensive, relationship-based, individualized instruction," said Kathy Bendheim, managing director of the National Student Support Accelerator. After-school tutoring has spotty attendance records, she said, and on-call, web-based tutoring may not be tailored to the student or used very frequently, either.


Thankfully, states and districts aren’t sitting on their hands in the face of learning loss. Supported by billions of dollars of federal funds, many have invested heavily in tutoring programs that promise to help struggling children overcome the challenges imposed by past school closures and virtual instruction. The question is whether those efforts work for enough students to justify their cost — and according to data generated by the National Student Support Accelerator, a Stanford initiative devoted to studying the effects of tutoring, there is reason for hope.


Transformative change in education often begins with a powerful story. Increasingly, high-impact tutoring is that story, where students find both significant academic success and personal confidence in their abilities. Rhyne Richards—a 6th-grade student in Washington, DC.—met several times each week with a tutor, Ms. Burns, to overcome math challenges. Rhyne’s journey speaks volumes. “I get distracted a lot [in class],” Rhyne admitted. “But when I’m with Ms. Burns, I learn a lot; a lot more than I knew last year.” It’s a testament to the remarkable impact of intensive, one-on-one tutoring. “I’m proud of myself,” Rhyne continued. “Before, I didn’t really know math like I do now. But now I can do it myself. I want to be the smartest person in the world.” Rhyne’s regained confidence in math and optimism for the future epitomize the profound evidence for and influence of intensive, relationship-based, individualized instruction—it is a narrative we must tirelessly work to replicate and scale.


This research report presents the results from the second year of a randomized controlled trial of an early elementary reading tutoring program that has been designed to be affordable at scale. During the 2021-22 school year, over eight hundred kindergarten students in a large Southeastern school district were randomly assigned to receive supplementary tutoring with the Chapter One program. The program continued during the 2022-23 school year, while the children attended first grade. The program embeds part-time tutors into the classroom to provide short bursts of instruction to individual students each week over the course of the school year. The consistent presence of the tutors allows them to build strong relationships with students and meet students’ individual needs at the moment they might most benefit from personalized instruction. The program focuses more time on students with the lowest literacy skills.

Stanford’s National Student Support Accelerator suggests various tutor trainings along with online pre-service trainings such as Saga Coach. The training level of tutors also impacts tutor payment with some models proposing payments of $20 per hour for non-professionals and payments of up to $50 per hour for teachers and professional tutors.

What makes tutoring high-impact? According to the National Student Support Accelerator, it involves substantial time each week, sustained and strong relationships between students and tutors, close monitoring of student knowledge and skills alignment to school curriculum, and oversight to ensure quality interactions. 


In a significant study involving 1,000 K-2 students in Texas, OnYourMark Education, in partnership with The National Student Support Accelerator (NSSA) and Uplift Education, presents compelling evidence of the positive impact of virtual high-impact reading tutoring on early literacy. During the 2022-2023 school year, students engaged in one-on-one virtual reading tutoring sessions, resulting in substantial academic gains.


Schools across America continue struggling to help their students catch up following unprecedented learning losses resulting from pandemic school closures beginning in March 2020. It is vital—both to address current needs and to stash away for future use—to determine which methods work to boost student achievement. To that end, a group of researchers, led by Stanford University’s Susanna Loeb, recently examined a high-dosage tutoring effort called OnYourMark, a fully virtual model designed to solidify foundational literacy skills for students in kindergarten through second grade.


Intensive, high-dose tutoring can boost early reading skills, even in a virtual format, according to a new experimental study.

Researchers from the National Student Support Accelerator at Stanford University tracked the reading progress of about 2,000 K-2 students in a dozen Texas charter schools. Half of the students were randomly assigned to attend class normally, while half received intensive remote tutoring for part of the school day, in small groups, through the nonprofit group OnYourMark, which serves K-2 students in seven states.


As schools, districts, and states work to address the student needs following the pandemic, many turned to high-impact tutoring, a research-based approach to providing individualized instruction to students. In fact, thirty-seven percent of public schools reported providing “high-dosage” tutoring on a federal school pulse panel survey in December 2022. In addition, many states have implemented or are exploring policies to increase access to high-impact tutoring. This brief explores the tutoring policy landscape at the state level as of November 2023.

“So, high impact tutoring is tutoring that happens with a qualified tutor and that means someone who is trained and is receiving coaching. It also happens frequently. So at least three to 5 times a week, in a small group or one-on-one. It is very personalized,” says Director of Partnerships and Policy for the National Student Support Accelerator Nancy Waymack.


  • In a hopeful sign for early literacy gains, K-2 students who received individual virtual tutoring during the 2022-23 school year showed higher reading test scores than their peers by the end of the year, according to a study released Wednesday by a tutoring research program at Stanford University.
  • The study, which analyzed 2,085 students across 12 Texas charter schools, found students using 1:1 or 2:1 virtual tutoring services performed 1.57 percentile points higher.
  • While the study found positive signs that the online tutoring model boosted reading comprehension for younger students, researchers acknowledged the outcomes from virtual tutoring are “more modest” than from similar in-person tutoring programs. 

While the virtual program was still less effective than in-person tutoring, the model could be a breakthrough for schools in rural areas and those that have struggled to recruit tutors, Loeb said. Districts’ pandemic recovery efforts have sometimes fallen short because they can’t find trained educators or volunteers to do the job. And research by Loeb and others has found that only a fraction of students who need extra help take advantage of on-demand virtual tutoring programs. 


This study is the first randomized controlled trial of a virtual early literacy tutoring program. OnYourMark Education provides tutoring grounded in the science of reading and focused on foundational literacy skills (e.g., phonics, phonological awareness, reading fluency). During the 2022-23 school year, OnYourMark partnered with 12 schools in a large charter-management organization in the southern United States to provide virtual tutoring in school to kindergarten, first, and second grade students. The program included four sessions per week for 20 minutes per session from September through May. We randomly assigned students to one-on-one tutoring (N=510), two-on-one tutoring (N=570), or a business-as-usual control group (N=1,005). We find that students assigned to OnYourMark tutoring scored approximately 0.08 SD higher on end-of-year early literacy tests than students in the business-as-usual control group, with lower-performing students (0.18 SD) and first graders (0.19 SD) assigned to 1:1 tutoring benefiting most. These positive findings from a virtual program with young readers provides initial evidence that virtual tutoring could be a promising option, especially in contexts with barriers to implementing in-person early literacy tutoring.

Districts across the nation use Multi-Tiered Systems of Support (MTSS) to target appropriate supports for each student. High-impact tutoring is the most effective research-backed academic support – consistently demonstrating from six months to over two years of learning gains for students across grade levels and content areas in a single year of tutoring.

Districts that have chosen to integrate high-impact tutoring with MTSS are finding that embedding this highly effective support into the fabric of their schools improves student outcomes, reduces implementation challenges, improves instructional coherence, and streamlines operations.


Districts across the nation use Multi-Tiered Systems of Support (MTSS) to target appropriate supports for each student. High-impact tutoring is the most effective research-backed academic support – consistently demonstrating from six months to over two years of learning gains for students across grade levels and content areas in a single year of tutoring.

Districts that have chosen to integrate high-impact tutoring with MTSS are finding that embedding this highly effective support into the fabric of their schools improves student outcomes, reduces implementation challenges, improves instructional coherence, and streamlines operations.