This book describes and analyzes the processes involved in the development, implementation, and evaluation of the Peterborough County (Ontario) Mathematics Project (PCMP), a districtwide mathematics program. Apart from describing the features of the PCMP, the book is intended to provide insights into the complexities of school change. The conceptual framework of the book is a ten-stage change model developed by Leithwood, Russel, Clipsham, and Robinson. Chapter 1 provides a brief overview of the project and describes the organization of the book. Chapter 2 discusses the school change model and outlines specific evaluation procedures used for the project. Chapter 3 focuses on stages 1-5 of the change model, and chapter 4 reviews stages 6-10. Chapter 5 traces the operation of the district's Mathematics Advisory Committee, one of two groups responsible for implementation of the project. Chapter 6 describes the curriculum products developed during the project and a number of technical issues that were confronted. Chapter 7 examines the project's processes of change and implementation, using the theoretical constructs of the change model as conceptual tools. (Author/JG)