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Devor, Geraldine M.; Stern, Carolyn – J Sch Psychol, 1970
Children were pretested and assigned to one of three treatments: training with three dimensional manipulanda; the same program except that the instructional materials were line drawings; and a control. On the posttest, both experimental groups were significantly superior to control group. (Author)
Descriptors: Children, Instruction, Instructional Materials, Learning