There are multivariate influences on the development of children's executive function throughout the lifespan and substantial individual differences can be seen as early as when children are 1 and 2 years of age. These individual differences are moderately stable throughout early childhood, but more research is needed to better understand their…

Longitudinal data from a large sample of twins participating in the Netherlands Twin Register (n = 42,827, age range 3-16) were analyzed to investigate the genetic and environmental contributions to childhood aggression. Genetic auto-regressive (simplex) models were used to assess whether the same genes are involved or whether new genes come into…

Objective: Low birth weight (LBW) is associated with attention problems (AP) and attention-deficit/hyperactivity disorder (ADHD). The etiology of this association is unclear. We investigate whether there is a causal influence of birth weight (BW) on AP and whether the BW effect is mediated by catch-up growth (CUG) in low-BW children. Method:…

A review of studies on identity status and of a study involving 2,557 Dutch adolescents who completed the Utrecht-Groningen Identity Development Scale (W. Meeus, 1993) supports a refinement of the identity status model that shows progressive developmental trends and indicates that the difference between high and low statuses increases with age.…

Development and use of the Concerns-Based Adoption Model (CBAM) and its instruments in the Netherlands, Flanders (Belgium), and the United Kingdom are reviewed, with emphasis on the validity of the developmental theory behind it. The CBAM appears to make it possible to offer schools assistance in dealing with change. (SLD)