Reasoning Mind products are used by over 100,000 students a year and have shown positive outcomes. In this design case we focus on implementation: how Reasoning Mind's approach evolved to tackle the challenge of achieving consistently high-quality implementations with many different schools, teachers, and students. Key insights include the definition of the Implementation Coordinator role and how that role is managed, the design and requirement of specific tools to support the implementation improvement process, and how Reasoning Mind's understanding of its organizational values in relationship to its approach to implementation evolved over time. Based on a study in which 23 schools in West Virginia are newly adopting Reasoning Mind, we also reflect on how the design insights are playing out in a large-scale implementation.