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de Hernandez, Lilian; And Others – Journal of Research in Science Teaching, 1984
Determined that males (N=70) demonstrate higher level of intellectual development than females (N=70), that males mature intellectually earlier than females, and that there appear to be factors other than age and sex that are related to development of formal operational reasoning. Implications of these and other results are discussed. (JN)
Descriptors: Age Differences, Cognitive Development, Developmental Stages, High Schools

Lazarowitz, Reuven – Journal of Research in Science Teaching, 1981
Purposes of this study were to (1) develop an instrument requiring several classification activities; (2) investigate the correlation between classification ability and intelligence scores of junior high school students (N=365); and (3) determine if classification ability differs with age and gender. Findings included a significant correlation…
Descriptors: Age Differences, Biology, Classification, Cognitive Development