The use of relevant data is at the core of the school review process approach. Various forms of relevant data are gathered, including demographic data, student achievement data, community perception data, and data on the current program (e.g., curriculum, instructional strategies, school climate factors, etc.). Perception questionnaires are included to gather input from administrators, teachers, support staff, and parents. This guide was developed to assist schools in planning and implementing a school improvement process focused on increasing student achievement. The guide provides school improvement team members with a flexible planning and implementation design that can be tailored to individual schools. The guide is structured to allow school improvement team members to customize the comprehensive review and implementation process to their own schools, and includes suggestions and guidance for: (1) Selecting and engaging a school improvement team; (2) Gathering relevant data; (3) Interpreting data; and (4) Planning for the implementation of improvement strategies based on an analysis of the data. Procedures, research-based strategies, and implementation tools are included. An annotated bibliography is appended. [The Center for Comprehensive School Reform and Improvement is administered by Learning Point Associates under contract with the Office of Elementary and Secondary Education of the U.S. Department of Education.]