This manual, written in response to requirements of the Washington State legislature, focuses on practices which can be undertaken during the siting, design, construction, or renovation of a school, recommends practices to help ensure good indoor air quality during building occupancy, and suggests protocols and useful reference documents for investigating and handling indoor air quality complaints and problems. Sections cover: why indoor air needs management; the factors influencing indoor air quality; the basic strategies for good indoor air quality; the siting, designing, and constructing of schools for good indoor air quality; and the operating and maintenance of heating, ventilation, and air conditioning (HVAC) systems. Final sections examine air contaminant sources and control in classrooms, offices, and special use areas; and planning and management methods to maintain indoor air quality. Appendices provide the Washington State Department of Health School Indoor Air Quality Survey, and an HVAC Checklist. (GR)