The Early Childhood Longitudinal Studies (ECLS) program offers the first nationally representative study of early childhood development and education in the United States. The ECLS program currently has three separate longitudinal studies fielded by the National Center for Education Statistics: The Early Childhood Longitudinal Study, Kindergarten Class of 1998–99; the ...
IMPAQ conducted randomized controlled trial (RCT) impact evaluations to examine the effects of interventions aimed at combating child labor in Costa Rica, Ecuador, India, Malawi, and Rwanda. (IMPAQ was acquired by AIR in 2020.)