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In Piaget's theory of cognitive development, the third stage is called the Concrete Operational Stage. During this stage, which occurs from age 7-12, the child shows increased use of logic or reasoning. One of the important processes that develops is that of Seriation, which refers to the ability to sort objects or situations according to any characteristic, such as size, color, shape, or type. For example, the child would be able to look at his plate of mixed vegetables and eat everything except the brussels sprouts.