Research in educational and developmental psychology offers evidence that children are developing basic capacities (i.e., executive functions) for self-regulating long before they receive formal instruction in school. Importantly, the evidence indicates self-regulation is a strong predictor of outcomes in early childhood and across the lifespan.…

In this study an attempt was made to obtain a developmental dimension for estimating longitudinal development on the basis of cross-sectional data. To check the validity of this approach, the cross-sectional data were compared with true longitudinal data. Forty-three public school children were given a series of conservation tasks in four…