U.S. schools are experiencing rapid demographic change due to high levels of immigration, while they at the same time they are implementing the federal No Child Left Behind (NCLB) Act. NCLB holds schools accountable for the performance of limited English proficient (LEP) children and other groups that include many children of immigrants. This report describes the demographics of children of immigrants, and the considerable overlap among NCLB's protected groups: LEPs, low-income students, blacks, Hispanics and Asians. The report describes variations in characteristics among children with parents born in different countries, and discusses implications for NCLB implementation in high-LEP schools and districts. [View the corresponding press release]