This document discusses the implementation of Response to Intervention (RTI) as an urban school reform effort. It describes an eastern US school district that is adopting an RTI model across 125 schools over 3 years using a constructivist leadership approach. Key aspects of the implementation include establishing school-based RTI teams, conducting staff training, inventorying interventions, setting screening and progress monitoring schedules, and regularly evaluating and refining the model. The goal is to establish a multi-tier system of academic and behavioral supports informed by data.