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Self-regulation develops rapidly during the years before formal schooling, and it helps lay the foundation for children’s later social, academic, and educational outcomes. However, children’s self-regulation may be influenced by cultural contexts, sociodemographic factors, and characteristics of the child. The present study investigates whether children’s levels of self-regulation, as measured by the Head-Toes-Knees-Shoulders (HTKS) task, are the same in samples from Norway ( M age = 5.79; N = 243, 49.4% girls) and the United States (U.S.) ( M age = 5.65; N = 264, 50.8% girls) and whether the role of mother’s education level and child gender on children’s self-regulation differ across the two samples. Results showed that Norwegian and U.S. children had similar levels of self-regulation. Mother’s education level significantly predicted children’s self-regulation in the U.S. sample but not in the Norwegian sample, and this difference across samples was significant. Girls had a significantly higher level of self-regulation than boys in the Norwegian sample, but there were no gender differences in the U.S. sample. However, the effect of child gender on self-regulation did not differ significantly across the two samples. Results highlight the importance of cross-cultural studies of self-regulation.

This study tests an intervention that introduces a structured curriculum for five-year-olds into the universal preschool context of Norway, where the business as usual is an unstructured curriculum. We conduct a field experiment with 691 five-year-olds in 71 preschools and measure treatment impacts on children's development in mathematics, language, and executive functioning. The nine-month intervention has effects on child development at post-intervention and the effects persist one year following the end of the treatment. The effects are mainly driven by the preschools identified as low-quality at baseline, indicating that a structured curriculum can reduce inequality in early childhood learning environments.

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