The transition from early childhood education to primary education is, in many countries, the beginning of compulsory education. This has meant that much of the research on this transition has focused on academic aspects such as literacy or logical-mathematical competence. The lines of research have changed, and in recent years, very diverse…

Assessed behavior and emotion regulation strategies of developmentally delayed and nondelayed young boys. Compared to nondelayed children, delayed children were equally able to understand others' play themes but were more intrusive in their entry attempts; appeared to have less effective emotion regulation strategies for coping with entry failure;…

The social development of a female rhesus monkey was followed from birth until death, age 32 months. The monkey had an extra autosome and was hydrocephalic. The monkey showed serious motor deficiencies, delayed social development, poorly established dominance relationships, and heavy dependence on mother and kin. The monkey was, however, well…