This review assesses the validity of the draft juvenile justice cost-effectiveness index. Although data compiled by the Department of Juvenile Justice for use in the draft index presents useful information about the performance of programs, the draft index itself does not provide a valid measure of program cost-effectiveness due to a number of validity and data quality concerns. A more valid index is needed to rank programs and evaluate their cost-effectiveness. We identify a number of design limitations that undermine the validity of the draft index and provide suggestions for addressing these limitations to develop a more valid index.