In recent years, the Executive Branch has increased efforts to improve children's nutrition while providing support to low-income families. In this process, it is especially important that food programs are structured as efficiently as possible to achieve their intended outcomes. The Improper Payments Information Act of 2002 (IPIA; P.L. 107-300), in conjunction with the Improper Payments Elimination and Recovery Act of 2010 (IPERA; P.L. 111-204), requires federal agencies to annually review all the programs and contracts they administer and identify those that may be susceptible to significant improper or erroneous payments. As a part of its efforts to meet these reporting responsibilities, the USDA's FNS engaged Optimal Solutions Group, LLC (Optimal) to conduct the assessment of CACFP sponsor tiering determinations. This assessment represents the eleventh CACFP study of sponsor tiering determinations and replicates the sampling approach, data collection strategies, verification algorithms, and analytical methodology used in the previous assessments. The purpose of this assessment is to provide estimates of 1) the percentage of erroneous payments that are due to assigning FDCHs to incorrect meal compensation tiers; and 2) the amount of reimbursements that were paid in error. (author abstract)