How can districts bring instructional improvement to scale within and across schools? The authors of "Collaborative School Improvement" argue that districts can play a powerful part in helping schools build the capacity to engage in inquiry-based reform--but that this effort requires a shift in districts' traditional role as a professional development provider. Drawing on case studies from three districts, the authors identify eight key practices for effective school-district collaboration. By helping districts teach--and model--an inquiry-based process, "Collaborative School Improvement" promises to offer powerful new support for scaling up data-driven instructional reform. [Foreword by Kathryn Parker Boudett.]