High-Impact Tutoring Programs: A District Leader’s Guide to Choosing a Partner and Tracking Results

By Rebecca Ray, Executive Director Content Strategy and Development, Catapult Learning

WHigh-impact tutoring is drawing enthusiasm from districts across the country, and the research behind it is strong. But the evidence also shows that results depend on how a program is run. For leaders aiming to raise districtwide student achievement, the key questions are what works, how to choose the right partner, and how to know the program is delivering.

What works

A 2026 review of 263 randomized trials found large average gains from tutoring. The review also points to a set of design features commonly used to define high-impact tutoring programs:

• In-person delivery during the school day
• Sustained relationships between students and tutors
• Small groups of no more than three students per tutor
• At least three sessions per week for a semester or longer
• High-quality materials guided by diagnostic and formative assessments

This is where small-group tutoring services earn their keep. Small groups and frequent sessions give tutors the time to know each student and respond to what they need.

How to evaluate a potential partner

Tutoring vendor evaluation should start with proof of delivery, such as session completion, attendance, and tutor retention from programs already running. Ask every vendor about:

Sessions actually delivered. What share of scheduled sessions do students complete? In a Stanford study of a large urban district, students completed only about a third of recommended sessions, and math gains appeared once they reached at least half. Look for a partner who ensures their sessions are completed not just scheduled. 

Group size and tutor continuity. Does the same tutor work with the same students for the duration of the program? Look for a 3:1 ratio, uninterrupted scheduling, and a deep bench of qualified tutors to staff a long engagement.

Alignment with core instruction and student needs.

Stanford’s National Student Success Accelerator recommends tutoring materials aligned with state standards that build on classroom materials when those are high quality. Look for a partner who will collaborate with you to build a plan connected to your own high quality instructional materials. Research also suggests that tailoring matters, and a boxed tutoring plan is unlikely to produce the same results. Ask how the partner uses both diagnostic data and your scope and sequence to shape the tutoring plan for each group.

Data sharing. Require session-level attendance and progress data your team can use. 

Evaluate programming and outcomes regularly

A strong partnership includes several metrics, and these metrics should be reviewed on a set cadence, not once a year. Agree on measures before launch:

• Weekly: session completion and student attendance
• Monthly: tutor retention, group size, skill coverage, and student progress
• Each testing window: growth on interim assessments
• Annually: state assessment results and districtwide student achievement

Your partner reports sessions, attendance, scheduling, and progress monitoring, and your district adds its own assessment results. Looking at both shows you what to adjust. If sessions are being missed, fix scheduling first. If sessions are strong but growth lags, revisit how instruction is tailored. Put the review schedule in your agreement, along with what happens if sessions fall short.

Scaling tutoring programs

Once high-impact tutoring is humming along in a few schools, growing it takes planning. Before you expand, make sure you and your tutoring partner can keep the same conditions in every school: small groups, consistent tutors, frequent sessions, and instruction connected to each school’s classroom materials. Ask your partner how they will recruit, train, and retain tutors as you grow, and how they will protect group size and session completion along the way. Use diagnostic data to decide which students are eligible, so tutoring reaches those who need it most. Then track the same measures in every school and add new schools in phases. 

The bottom line

The districts most likely to see results will choose a partner who delivers the basics, keep groups small, align with core instruction, and check delivery as closely as they check outcomes.

What is high-impact tutoring?

High-impact tutoring (sometimes called high-dosage tutoring) is a structured intervention model defined by a specific set of design features rather than by subject or grade level: in-person sessions during the school day, a consistent tutor working with the same students over time, groups of no more than three students, at least three sessions per week for a semester or longer, and materials aligned to classroom instruction and guided by diagnostic data. It is distinct from on-demand, drop-in, or homework-help tutoring, which lacks the sustained relationship and frequency that drive results.

How do you measure whether a tutoring program is working?

Measure delivery before outcomes. Track session completion and student attendance weekly, since gains depend on students actually receiving a high share of scheduled sessions. Review tutor retention, group size, and skill coverage monthly, growth on interim assessments each testing window, and state assessment results annually. If completion is low, fix scheduling first; if completion is strong but growth lags, revisit how instruction is tailored to each group. Agree on these metrics and the review cadence in the contract before launch.

What questions should a district ask a tutoring vendor?

Ask for proof of delivery from programs already running: the share of scheduled sessions students complete, tutor retention rates, and whether the same tutor stays with the same students for the full engagement. Confirm the student-to-tutor ratio (3:1 or smaller), how the vendor aligns tutoring to the district’s own instructional materials and scope and sequence, how diagnostic data shapes each group’s plan, and what session-level attendance and progress data the district will receive. For expansion, ask how the vendor will recruit, train, and retain tutors while protecting group size and session completion.