Federal Expenditures on Pre-Kindergarteners and Kindergarteners in 2008, along with Federal Expenditures on Elementary-Age Children in 2008, are two reports that provide first-time analyses of national investments in children age 3 through 5 and children age 6 through 11. This appendix details our data sources, the programs we include, and the methodology used to estimate the percentage of all expenditures that went to children.