In a test of class inclusion, Piaget aimed to investigate:

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Piaget's test of class inclusion aims to investigate a child's understanding of categorical hierarchy. This refers to the concept that objects can belong to different groups or categories, and that one category can be a subcategory of another. For example, a child may understand that a dog is an animal, and that animals can be further categorized into groups such as mammals and reptiles. Piaget would present the child with a task where they have to choose which group has more members, a higher category or a lower one with fewer members. A child who correctly understands categorical hierarchy would choose the higher category, even though it has fewer members than the lower category.

In a Test of Class Inclusion, Piaget Aimed to Investigate