Abstract
Group training of conservation of length was undertaken with primary school children in Botswana. Each group contained 10 subjects of mixed academic ability. Three methods of training were used: (1) teacher demonstration accompanied by responsive group recitation, (2) limited manipulation of training materials by students, (3) full manipulation of training materials by students. The three training methods were effective in producing learning, retention, and generalization of conservation. The results are discussed in terms of Piaget's views on the role of environmental influences and the function of action in the development of cognitive structures. The value of Piagetian concepts for non-technological societies also is discussed.
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