Researchers concerned with development in infancy and early childhood have tended to ask basic or applied questions, but not both. The same issues have been salient to people in the basic and applied fields, but because researchers have been working from different perspectives, there has been relatively little cross-fertilization. As a vehicle for facilitating integration, a contrasting analysis of basic and applied research on several problematic issues is provided. Particular attention is paid to research directly or indirectly relevant for child development programs and supplemental child care. Emphasis is given to the integration of findings, the identification of unaddressed questions, and methodological problems.