Promoting child development in a universal preschool system : a field experiment

This study tests an intervention that introduces a structured curriculum for five-year olds into the universal preschool context of Norway. 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. Compared to business as usual, the nine-month curriculum intervention has effects on child development at post-intervention and the effects persist one year following the end of the treatment. The effects are entirely driven by the preschool centers identified as low-quality at baseline, suggesting that a structured curriculum can reduce inequality in early childhood learning environments.