Abstract
To investigate the effects of computer programming in Logo on specific geometric conceptualizations of primary grade children, 48 third graders were randomly assigned to either a Logo or a control group. The Logo group was given 26 weeks of instruction in a Logo environment. The children were then interviewed to ascertain their conceptualizations of angles, shapes, and motions. In both groups children's notions of angle and angle measure were multifaceted and included a number of misconceptions, although performance was uniformly higher for the Logo group. The Logo children were more aware than the control children of the components of geometric shapes and were more likely to conceptualize geometric objects in terms of the actions or procedures used to construct them.
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