The validation of the developmental Mokken scale for seriation was discussed. It was shown that the observed scale was invariant for different samples from previous research. Stepwise multiple regression analysis revealed that a selection of two seriation tasks on the scale accounted for 76.4 percent of the explained variance. (Author/DWH)

Seriation refers to the process of ordering objects along single or multiple magnitude dimensions such as length, weight, and color. The ability to order objects in terms of some attribute is essential for the child's understanding of the properties of numbers. This study investigated the effect on seriation performance of increasing both the…

The development of cognitive representation is the main theme of three classic theories (Piaget, Bruner, Vygotsky) on how children learn concepts. Piaget considered structural change as a necessary condition for development; Bruner emphasized both internal and external function and the structural changes brought about by function; and Vygotsky…