Regarding Jean Piaget's theory of cognitive development, a major limitation of the 'Preoperational Stage' is the 'lack of decentralization' or 'egocentrism' and the lack of understanding of 'conservation'. In Piaget's famous 'Three-Mountain Problem' experiment, a child in this stage imposes their own visual perspective onto others. Conversely, when the child enters the concrete operational stage, which main cognitive ability do they acquire to overcome this limitation?

According to Jean Piaget's theory of cognitive development, children in the preoperational stage (approx. 2 to 7 years) exhibit egocentrism, due to which they are unable to view a situation from another person's perspective. Also, they lack decentration and reversibility, preventing them from understanding the concept of conservation (e.g., quantity of water remaining unchanged when poured into a different container). When the child enters the concrete operational stage (approx. 7 to 11 years), they develop the abilities of decentration, reversibility, and classification. For a detailed study on this topic, you can see Wikipedia reference.