The present study examined the roles that language of assessment, language dominance, and teacher language use during instruction play in Dual Language Learner (DLL) science scores. A total of 255 Head Start DLL children were assessed on equated science assessments in English and Spanish. First overall differences between the two languages were examined, then associations between performance on science assessments were compared and related to children’s language dominance, teacher quantity of English and Spanish, and teachers’ academic science language. When examined as a homogeneous group, DLLs did not perform differently on English or Spanish science assessments. However, when examined heterogeneously, Spanish-dominant DLLs performed better on Spanish science assessments. The percentage of English and Spanish used by teachers did not affect children’s science scores. Teachers’ use of Spanish academic science language impacted children’s performance on science assessments, but English did not. The results have implications for the assessment of DLLs and teacher language use during instruction.

Despite the growing interest in early science education, there is much left to be explored, particularly in majority Dual Language Learning (DLL) classrooms. The current study examined 1) early science opportunities across classroom contexts in majority Spanish-English DLL Head Start classrooms, 2) the languages (i.e., English and Spanish) that teachers used to engage DLL children in science, 3) and how teachers’ discussion of scientific and engineering practices and disciplinary core ideas related to children’s academic outcomes. In a sample of 411 children (ages 3-5) from 34 Head Start classrooms, the current study found that teachers discussed and encouraged more practices during science lessons than circle time, dramatic play, and story time. There were no differences in teachers’ discussion of core ideas across contexts. Teachers used the same amount of English and Spanish to discuss practices and core ideas. Teaching physical science was associated with children’s science outcomes. Making observations and discussing life science were associated with children’s math outcomes. Teaching math, making observations, and developing and using models were related to children’s executive functioning. Findings from this study demonstrate that science opportunities occur across preschool classroom settings. Additionally, it provides evidence that teachers may be supporting DLL children’s home language while discussing science. Finally, results indicate that teaching science supports children’s academic performance in several outcomes. These findings have implications for DLL education policy as science may be a domain where teachers can support children’s home language and their learning across multiple domains.

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Spanish-speaking families in the United States must often overcome multiple challenges to support their young children’s early language development (e.g., language and cultural barriers, financial stress, limited learning resources, etc.). These challenges highlight the need for early language interventions tailored to the needs of Spanish-speaking families and developed in collaboration with them. For diverse populations, early language interventions which are both translated into the relevant language and culturally responsive are the most effective for improving child outcomes. However, few interventions meet both criteria, demonstrating a need for materials that are accessible across both language and culture. The current study describes the five-phase process of creating a linguistically and culturally relevant Spanish adaptation of Duet, an early language intervention. The adaptation of the Duet intervention modules involved multiple language experts, including Spanish-speaking developmental psychologists, a translation company, and Spanish-speaking caregivers of infants and toddlers. Fourteen caregivers were recruited to participate in two, 3-h focus groups. Input from caregivers was a particularly important step in the adaptation process, as caregivers hold knowledge about everyday experiences with their children. Through this process, the authors aim to shed light onto the importance of collaborating with the community and present a possible framework for others who are adapting interventions.