GAO was asked to review CCDF program-integrity efforts. This report discusses, among other things, the extent to which OCC provides oversight of (1) states' CCDF program-integrity activities, including encouraging that all requested information is included within State Plans; and (2) improper-payment risks and relevant corrective actions in states' CCDF programs. GAO analyzed 51 approved CCDF State Plans, including from the District of Columbia, for the fiscal years 2019–2021 grant period. GAO also reviewed OCC policies and procedures and compared them to relevant laws, regulations, and Standards for Internal Control in the Federal Government, and interviewed relevant federal officials. (author abstract)