2.3 Piaget's Stage of Development o 2.3.2 Preoperational stage(age two to seven) The maior accomplishments is development of the ability to use symbols to represent objects in the world. Thinking remains egocentric and centered. They still lack the principle of conservation These childrens thinking is irreversible. Reversibility means the ability to change direction in ones thin king so that one can return to a starting point.2.3 Piaget’s Stage of Development ⚫ 2.3.2 Preoperational stage(age two to seven): ⚫ The major accomplishments is development of the ability to use symbols to represent objects in the world. Thinking remains egocentric and centered. They still lack the principle of conservation. ⚫ These children’s thinking is irreversible. Reversibility means the ability to change direction in one’s thinking so that one can return to a starting point