Early child care: The known and the unknown

Child care research during the last 20 years has made considerable progress in addressing questions about (a) the effects of child care quality, (b) the effects of amount and timing of early child care, and (c) the effects of different types of care such as centers, child care homes, and relative care. This commentary summarizes the converging research evidence with respect to each of these questions and then outlines some future directions for child care research.