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Lengel, Robert A.; Buell, Robert R. – Science Education, 1972
Although there was an increase in the proportion of students using the logical principle of exclusion" from grades 7 to 9 to 12, there was little relationship with IQ and socio-economic measures. (AL)
Descriptors: Cognitive Development, Cognitive Processes, Educational Research, Intellectual Development

Buell, Robert R.; Bradley, Gertrude A. – Science Education, 1972
Descriptors: Chemical Equilibrium, Chemistry, Cognitive Processes, Educational Research