Abecedarian Early Intervention Project

The Carolina Abecedarian Project was a controlled experiment that was conducted in 1972 in North Carolina, United States, by the Frank Porter Graham Child Development Institute to study the potential benefits of early childhood education for poor children to enhance school readiness. It has been found that in their earliest school years, poor children lag behind others, suggesting they were ill-prepared for schooling.

Source: Wikipedia — Abecedarian Early Intervention Project (CC BY-SA 4.0)