High-impact tutoring is a research-based approach to providing individualized instruction for students and accelerating learning. It was one of the most popular uses of federal Elementary and Secondary School Emergency Relief (ESSER) dollars, with 10 states spending a portion of their funding on large-scale tutoring initiatives. Illinois was one of these states, launching the Illinois Tutoring Initiative (ITI) in 2022. Over two years, the initiative served more than 7,200 students across 209 schools in 72 districts and achieved national attention for its success. Evaluation data suggests that ITI had a significant impact on student learning. One analysis of the initiative's first year found that from fall to spring, nearly 90% of tutored students met or exceeded expected growth in math and nearly 80% of tutored students met or exceeded expected growth in reading. It also found that tutored students scored significantly higher on end-of-year assessments. ITI's success garnered the attention of the White House, which spotlighted ITI as an example of successful high-dosage tutoring. The implementation of ITI is instructive for a few key reasons: Illinois managed to coordinate and align several government agencies and institutions of higher education (IHEs) to design, roll out, scale, and monitor an initiative that achieved statewide reach while still remaining faithful to evidence-based design principles. Additionally, ITI's intentional use of data in program design, rollout, and evaluation helped ensure that the initiative was responsive to local contexts and produced evidence of impact that supported buy-in, scaling, and continuous learning. This case study focuses on three elements of Illinois' implementation of ITI, highlighting high-quality practices in Leadership and Governance; Data-Driven Decision-Making; and Evaluation, Reporting, and Continuous Improvement.