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Ehindero, O. J. – Journal of Research in Science Teaching, 1982
The concepts of distance, area, and the coordinate reference systems were investigated in relation to the displacement volume task among 300 randomly selected primary and high school children in Nigeria. Although results support Piaget's hypothesis, a developmental lag of about two years was observed in Nigerian students. (JN)
Descriptors: Cognitive Development, Concept Formation, Conservation (Concept), Developmental Stages