In this case study, learn how the Southern Regional Education Board (SREB) partnered with 12 schools in Jefferson County, Alabama, to form networked improvement communities focused on promoting meaningful, sustainable change. Their goal was simple yet bold: Harness improvement science and continuous improvement strategies to accelerate eighth- and ninth-grade math achievement for Black, Latinx and low-income students. Three years and one pandemic later, SREB and Jefferson County educators reflected on the successes, challenges and lessons learned from their efforts.