Descriptor
| Classification | 1 |
| Cognitive Development | 1 |
| Grade 1 | 1 |
| Grade 2 | 1 |
| Grade 3 | 1 |
| Kindergarten | 1 |
| Logical Thinking | 1 |
| Training | 1 |
Source
| Human Development | 1 |
Author
| Youniss, J. | 1 |
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Peer reviewedYouniss, J. – Human Development, 1971
Results of this investigation support the view that operating class inclusion requires coordination between logical intension and extension, a process which can be facilitated through training. (Author/WY)
Descriptors: Classification, Cognitive Development, Grade 1, Grade 2
