The purpose of the present study was to explore how often teachers of young children teach science concepts in kindergarten and examine the factors that influence the frequency of science teaching in early years. A theoretical model of the determinants of the frequency of science teaching in kindergarten was developed and tested using a multi-level structural equation modeling. Data for this study (n = 3305) came from the Early Childhood Longitudinal Study – Kindergarten dataset, which included a nationally representative sample of US kindergarten teachers. The model tested in this study provided a good fit to the sample data. The results demonstrated that the number of science method courses that teachers completed, the availability of science related instructional materials in kindergarten classrooms, and teachers' perceptions of children's capacity for learning influence the frequency that teachers taught specific science concepts (e.g. earth and space, life, and physical science) in kindergarten. On the other hand, results indicated that teaching experience and teachers' perceptions of control over the curriculum do not influence how often early childhood teachers teach science concepts in kindergarten.

Research Findings: The purpose of this study was to investigate the factorial structure of kindergarten children's mathematics and science process skills and the impact of children's competencies in process skills on their performance on mathematics and science achievement tests in 3rd grade. A subset of the Early Childhood Longitudinal Study–Kindergarten cohort data set (n = 8,731) was analyzed using multilevel structural equation modeling. Results demonstrated that science and mathematics process skills were highly related at the construct level but not at the indicator level, as was anticipated. Kindergarten children's competency in mathematics process skills was a strong predictor of their performance on science and mathematics achievement tests in the 3rd grade. However, children's competency in science process skills was only a significant predictor of their performance on a science achievement test in the 3rd grade. Moreover, socioeconomic status and gender were statistically significant predictors of process skills and performance on achievement tests. Practice or Policy: The findings of the present study suggest that the development of children's science and mathematics process skills should be supported utilizing integrated inquiry-based science and mathematics activities to help children recognize the connection between mathematics and science and to contribute to their science and mathematics achievement in later grades.

Over the past two decades, science has increasingly become an integral part of early childhood curricula, and research on teaching and learning science in early years has emerged as an established field of study. Collectively, the findings of a growing body of literature suggest that introducing science in developmentally appropriate ways may support young children’s learning of science concepts and scientific thinking skills. The increasing number of edited volumes and special issues, including this one, devoted to the topic of early childhood science teaching and learning indicates that early science education, as a field of study, will continue to attract researchers from early childhood and science education as well as educational and cognitive psychology.