Understand Piaget's terms: Centration, egocentrism, focus of appearance, static reasoning, and irreversibility
Centration: The tendency to focus on one aspect of a situation to the exclusion of all others.
Egocentrism: A particular type of centration, literally self-centeredness. To contemplate the world exclusively from one's own personal perspective
Focus of Appearance: Preoperational thought. A girl given a short haircut might worry that she has turned into a boy. In preoperational thought, a thing is whatever it appears to be.
Static Reasoning: Assuming that the world is unchanging, always in the state in which they currnetly encounter it
Irreversibility: Preoperational thinkers fail to recognize that reversing a process sometimes restores whatever existed before