Head Start has served over 16 million children at a cost of $35 billion in the 30+ years of its existence. Funding for Head Start has tripled in the past 10 years. Growing out of the War on Poverty in the mid-1960s, Head Start was created to provide comprehensive educational, health, social, and mental health services to disadvantaged preschool children. This report describes the (1) number and characteristics of those served, (2) services provided and the way they are provided, (3) federal and nonfederal program dollars received and spent by programs delivering Head Start services, and (4) other programs providing similar early childhood services.