Growing out the challenges and opportunities of a high school built around team-teaching, and forged through use at 40+ diverse secondary sites as part of a 2.5 year project to champion non-routine problem-solving in middle school classrooms, a simple model, and some key principles, for coaching led teacher growth have emerged. What will be shared in this workshop, the model, thinking behind it, the data and what is next, may be more blindingly obvious than revolutionary, and will hopefully make for an interesting take on how teachers grow and adopt new practices, and the conditions that help or hinder that happening.