This report examines (1) comprehensive support and improvement (CSI) school characteristics; (2) how CSI plans address selected Elementary and Secondary Education Act (ESEA) requirements; and (3) Education monitoring. The Government Accountability Office (GAO) compared the characteristics of CSI and other schools using 2019-20 Education data (the most recent available). GAO also analyzed a generalizable sample of CSI plans (the most recent available as of June 2022) to assess how they addressed three ESEA-required elements for plan content for which Education has issued guidance. GAO interviewed officials from three CSI schools selected for varied locale and other factors and held two discussion groups with officials from six districts with CSI schools across six states. GAO also interviewed Education officials and reviewed relevant federal laws and monitoring documents.