RT Journal Article SR Electronic T1 The Effects of a Structured Curriculum on Preschool Effectiveness: A Field Experiment JF Journal of Human Resources JO J Hum Resour FD University of Wisconsin Press SP 0220-10749R3 DO 10.3368/jhr.0220-10749R3 A1 Rege, Mari A1 Størksen, Ingunn A1 Solli, Ingeborg F. A1 Kalil, Ariel A1 McClelland, Megan M. A1 ten Braak, Dieuwer A1 Lenes, Ragnhild A1 Lunde, Svanaug A1 Breive, Svanhild A1 Carlsen, Martin A1 Erfjord, Ingvald A1 Hundeland, Per Sigurd YR 2021 UL http://jhr.uwpress.org/content/early/2021/12/03/jhr.0220-10749R3.abstract AB 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.