The final three stages are operational stages. The preoperational stage occurs when a child begins and continues to develop language and thinking skills, and typically lasts from age two until age seven. The child also becomes focused on himself and how the world relates to him. The concrete operational stage usually occurs between the ages of seven and twelve. During the concrete operational stage, a child begins to see the world in relation to others, not just himself. Children also begin to develop locigal thinking; they begin to understand that the way objects are set up has nothing to do with the amount of an object. For example, children will begin to understand that in the following pictures, even though they are set up differently,
