National Center for Early Development and Learning provides research on Children in quality care programs when they were 3 and 4 years old through the early elementary years than children in poor-quality care.

Identifies, evaluates, and promotes effective and appropriate early intervention and preschool practices that are sensitive to culturally and linguistically diverse children and families.

The Studies of Education Reform project was initiated by the Office of Education Research and Improvement, U.S. Department of Education, to examine the implementation and effects of twelve significant education reform strategies, including student assessment, parent community involvement, uses of technology, and early childhood services.

What we know and don't know about the costs and benefits of early childhood interventons.

A review of the effects of early childhood programs on the development of children from low-income families, focusing on cognitive and school outcomes

Research at the National Center for Early Development & Learning (NCEDL), focuses on enhancing the cognitive, social and emotional development of children from birth through age eight.

The Early Childhood Institute (ECI) sponsors comprehensive and challenging research in order to help ensure that America's young children are successful in school and beyond -- and to enhance their quality of life and that of their families.

A non-profit organization dedicated to promoting social, emotional and mental development in early childhood through education, training, and research.

Data from the Survey of Income and Program Participation about child care arrangements. Includes weekly child care costs, and preschooler care arrangements.