One way to improve K-12 education outcomes is to scale up programs that have rigorous evidence of effectiveness. The American Institutes for Research, in partnership with Teachstone and Learning Forward, led a project focused on a teacher professional learning program called MyTeachingPartner-Secondary — an instructional coaching program that has already demonstrated positive impacts on student achievement in two randomized controlled trials. The partnership worked with 49 schools across 15 states from 2017 to 2023 to expand the use of the program and boost awareness of its distinctive features, while also generating rigorous evidence to inform improvements and examine program impacts. Educators participating in the program reported that the predictable, efficient process, the use of video, and the focus on teachers’ successes rather than weaknesses were