le to be in it makes it float.” It is a hard question, but he took a guess. He had a hard time explaining it. This is normal for a child in his stage according to Piaget. My eleven-year-old brother said, “Because they have a triangular shape, and the design of it makes it float.” He is thinking more logically, but he still has a little trouble with the question because he is not yet thinking completely like an adult. This is normal for a child his stage.Preoperational children have problems with hierarchical classification. They are not capable of logical operations, so they cannot organize objects into classes and sub-classes on the basis of similarities and differences between the groups. Concrete operational children also have problems with hierarchical classification because they do not think as logically as an adult.Piaget developed the class inclusion problem, and performed it on children to study hierarchical classification. I performed the class inclusion problem on my brother. I showed them a set of three blue flowers and a set of eight yellow flowers. I asked them which was more, the yellow flowers or the flowers. They both said there were more yellow flowers. Their answer goes along with Piaget’s studies. My seven-year-old brother did not answer the question correctly because he is in the preoperational stage and does not think logically enough to understand the sub-classes. My eleven-year-old brother could not answer the question because concrete operational children still have problems with hierarchical classification....
