2.3 Piaget's Stage of Development 2.3.2 Preoperational stage(age two to seven) o The maior accomplishments is development of the ability to use symbols to represent objects in the world. Thin king 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 point2.3 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