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Research Findings: The Quality of Care for Infants and Toddlers (QCIT) observational measure was designed to address the need for a valid and reliable measure of the quality of caregiver-child interactions that could be used in both center-based and family child care (FCC) settings, and with diverse populations. Results from a psychometric field test of 400 classrooms indicated that the QCIT demonstrated strong evidence of reliability and validity. The QCIT was used to capture the quality of caregiver-child interactions for the professional development system "We Grow Together." Average scores improved in the QCIT Support for Social-Emotional Development domain. Findings support using this measure to assess quality and focus professional development. Additional research could use the QCIT with other interventions focused on caregiver-child interactions. Practice or Policy: The QCIT provides the field with a reliable and valid measure for examining the quality of caregiver-child interaction in licensed child care settings, both centers and FCCs, serving infants and toddlers. It also provides an evidence-based framework for selecting professional development goals that support the development of infants and toddlers.

Research Findings: This study examined associations between the expressive vocabulary of classroom peers and children's own vocabulary knowledge using conceptual scoring in a linguistically diverse sample of 4-year-olds who attended universal preschool programs in a metropolitan area. Higher peer conceptually scored expressive vocabulary was associated with higher conceptually scored expressive vocabulary for all children. The association was stronger for children who were dual language learners (DLLs), such that higher peer ability was associated with stronger growth in conceptually scored expressive vocabulary for DLLs across languages than for children fluent in English. Practice or Policy: This research suggests that policymakers may want to investigate the advantages of setting aside slots in targeted programs for children who have stronger conceptual vocabularies. Administrators should consider conceptual and verbal ability and classroom composition when assigning children to classes. This research also suggests that greater use of intentional pairs or small groups and strategies such as coaching peers in supporting one another's conceptual vocabulary may be particularly important for DLLs.

Research Findings: We examined the reliability and validity of the language, literacy, and mathematics domains of "Work Sampling for Head Start" (WSHS), an observational assessment designed for 3- and 4-year-olds. Participants included 112 children who were enrolled over a two-year period in Head Start and a number of other programs sponsored by community-based organizations affiliated with a local school district. Teachers were trained to administer the WSHS checklist and to collect observational data about their children over the course of the children's year of enrollment. Outcome data were individually administered tests of early reading and early mathematics. Cronbach's alphas, correlations, regressions, and receiver operating characteristic curves were computed. Results indicated very high reliability of WSHS subscales. Findings also demonstrated moderate correlations between WSHS and the outcomes and unique contributions to the assessments of reading and mathematics by WSHS over and above demographic variables. The receiver operating characteristic curves showed that WSHS can be used accurately by teachers to predict children's early mathematics and reading performance. Practice and Policy: Discussion includes the role of observational versus norm-referenced tests in early childhood classrooms. Also discussed are such issues as variance in methods of assessment and the impact of high-stakes tests on young children. (Contains 6 tables and 2 figures.)