Abstract: This study was made among 32-children between the ages of 3 and 6. The results showed that:1. Preschool children's generalizing ability in classification had 4 levels of development.2. The different levels of generalizing ability in classification between the age groups of 3、4、5 and 6 were not 'clearly defined, but transferred from one level to the next The level rose gradually with age.3. Different levels of generalization were found within the same-age group in the classification of different objects, requests and conditions.4. Generalizing ability was influenced by educational conditions.

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