I analyse low and high achieving children's competences regarding pattern and structure at the beginning of formal schooling comparatively. The aim is to evaluate the range of school starters' early structure sense. The results suggest overall high pre-instructional competences which, however, differ strongly between the mathematical high and low…

Notes that the microgenetic method has revealed new information about normally achieving children's cognition, and reviews data from three different microgenetic studies. Concludes that there are similar sequences of strategy change, similar rates of strategy change, and similar frequency of strategy discovery and use in children with and without…

Performance in concrete and abstract tasks is examined systematically by varying the degree of abstractness of problem-solving and concept formation tasks. Four forms of a problem solving test were constructed. Each form of the test presented problem situations through four different modes: verbal stories, picture-book, color slides,…