From Concrete Operations to Formal Operations Logical thinking is evident during the concrete operational stage but develops more fully during the formal operational stage. At about the age of 12, the young person becomes capable of applying logical thinking to hypothetical situations and abstract concepts, such as the principles of molecular bonds in this chemistry class. But, as is true of each of Piaget's stages, new cognitive abilities emerge gradually. Having a tangible model to manipulate helps this student grasp abstract concepts related to the brain.
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