By providing an in-depth examination of thresholds of quality, specificity of quality measurement, dosage operationalized in several ways, and interactions of dosage and quality, the secondary data analyses reported here sought to extend the understanding of how early childhood care and education quality and child outcomes are related. We report findings from analyses that included the child's entry skills and family demographic characteristics as covariates and only report findings that were replicated across studies or across measures as a means to reduce, but not eliminate, potential biases.