We do not require grantees to verify the household income of each child they serve. Grantees may use proxy measures to estimate the number of children who reside in low-income households. For example, if a grantee is serving a representative sample of a school population, and 70% of the students in the school are identified as economically disadvantaged, then the grantee reasonably could assume that at least 70% of the students served by the program are economically disadvantaged.