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| Abstract Reasoning | 1 |
| Cognitive Development | 1 |
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| Collis, Kevin F. | 1 |
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Collis, Kevin F. – 1977
In earlier research the writer was constrained by the variables which were continuously appearing in both experimental class teaching experiences and various psychological experiments to distinguish four levels of cognitive sophistication in so far as mathematical material was concerned between the ages of 7 years and 17 years. In current research…
Descriptors: Abstract Reasoning, Cognitive Development, Cognitive Processes, Concept Formation
