This report provides brief case studies of 22 public school buildings in 12 states, representing urban, suburban, and rural communities, including both district-run and charter public schools. The studies demonstrate the schools' ability to improve academic achievement and behavior in safe, nurturing, and stimulating environments. The researchers say the case study analysis reveals that on average, smaller schools can provide a safer and more challenging school environment that creates higher academic achievement and graduation rates, fewer disciplinary problems, and greater satisfaction from families, students, and teachers. Also, schools that share facilities with other organizations offer broader learning opportunities for students, provide higher quality services to students and their families, and present a way to efficiently use tax dollars. (GR)