This report examines how indoor air quality (IAQ) affects a child's ability to learn and provides several case studies of schools that have successfully addressed their indoor air problems, the lessons learned from that experience, and what long-term practices and policies emerged from the effort. The report covers the effects from building-related illnesses, from mild symptoms of distress, the estimated loss in performance, measured loss in performance, the measured effects of temperature and humidity and case studies of three schools. Comments provide information on the "IAQ Tools for Schools Kit" that schools can use to improve and maintain good indoor air quality. Appended are case studies of William Blackstone Elementary School, King-Murphy Elementary School, and G.W. Carver and Charles Drew Elementary Schools. (Contains 12 references.) (GR)