What is, or could be, the role of the district in the adoption and implementation of IB? To explore that question, researchers from the Institute for Education and Social Policy at NYU selected one site that has earned a reputation success in both participation levels and performance in its school program and as a leader for its role - as a district - in the expansion and support of those programs. Our questions focused on why they made that choice and how they went about implementing it, where they created new structures or supports for schools, and what evidence they point to as markers of success (or pitfalls to avoid). Our hope was to learn by studying what they have learned by doing, and to share what they have learned with other districts and schools.