Final answer:
According to Jean Piaget, egocentrism refers to the inability to take another person's perspective or point of view into consideration. It is a characteristic of cognitive development during childhood.
Step-by-step explanation:
According to Jean Piaget, the inability to take another person's perspective or point of view into consideration is called egocentrism. Piaget developed the Three-Mountain Task to determine the level of egocentrism displayed by children. This task involves asking children what another person at a different viewpoint would see in a 3-dimensional mountain scene. Egocentrism is a characteristic of cognitive development during childhood.