Described are how students (n=2,000) reduce the complexity of multivariable problems. Tendencies toward "functional reduction" in common reasoning are shown to range from a simple reduction in the number of variables considered, to a more elaborate procedure where all variables are taken into account, but in a simplified way involving…

Investigates spontaneous reasoning of 709 French, Belgian, and British students in elementary dynamics using the relations between force, energy and motion as the study topic. Students were selected from the last year at secondary school to the third year at university. (HM)