A researcher shows a group of 8-year-old children 20 fruits, out of which 12 are oranges. He asks them if there are more oranges or more fruits. The children answer that there are more fruits than there are oranges. In the context of Piagetian cognitive development, this scenario primarily exemplifies the concept of

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This scenario exemplifies the concept of class inclusion, which is the understanding that a whole category can encompass several different subcategories or individual items. In this case, the children recognize that the category of "fruits" includes the subcategory "oranges" along with other fruits, indicating their ability to understand that the whole (fruits) is greater than one of its parts (oranges). This ability typically develops during the concrete operational stage of Piagetian cognitive development, which occurs from about 7 to 12 years of age.

A Researcher Shows a Group of 8-Year-Old Children 20 Fruits