To find out if children could make functions before age 4, 73 children aged 1 to 4 were encouraged to imitate the use of a lever to make a beanbag fly up. Functions are mental relationships that preoperational children can make between 2 things at a time in a unidirectional way (Piaget, Grize, Szeminska, & Bang, 1968/1977). The child's…

Examines research on the importance of understanding children's biological timetables for mind and brain development, and forces that can threaten this neurodevelopmental timetable during critical periods. Discusses the brain's adaptability, and focuses on the importance of knowledge derived from the study of special populations for understanding…

Introduces this special journal issue by describing what developmental approaches are and how they can be applied to children with disabilities. Gives a short preview of the articles in the issue and raises future challenges for developmental research and intervention with young children with disabilities. (JS)

Argues for expanding the present discourse on developmental appropriateness on the grounds that this discourse assumes consensus about child development; is premised on a suspect notion of broad, universal stages; and ignores alternative perspectives on learning and development and the relationship between the two. (LB)