Examined the judgement of rectangular areas in young children who are blind from birth. Subjects were eight children ranging from six to eight years old. Their gestural strategies were examined in detail when placed in an area evaluation situation. Results indicated that acquisition of information concerning figures appeared to follow a fairly…

Focuses on the strategies young children (N=115) use to solve rectangular covering tasks before they have been taught area measurement. Children's solution strategies were classified into five developmental levels. Emphasizes the importance of understanding the relationship between the size of a unit and the dimensions of the rectangle in learning…

Focuses on the role of tools, provided by a computer microworld (C.AR.ME), on the strategies developed by 14-year-old students regarding the concept of conservation of area of a non-convex polygon. Indicates that the nature of the tools used affected the nature of solution strategies that students constructed. (Author/KHR)