Piaget thought that a child’s mind changes to better fit with the world through adaption. Children use adaptation by changing schemas to fit the world. Piaget thought that adaptation has two parts: assimilation and accommodation. In assimilation children use the schemes they have to understand the world. Children’s schemes do not always right. When a child has a schema that is not right, they have to change it. This is called accommodation. In accommodation new schemes are made or old ones are changed. The changes must take place so the child can better understand the world. Piaget thought there is a balance between assimilation and accommodation. He called the balance cognitive equilibrium. When a child’s schemes fit their understanding of the world then the child is in equilibrium. When the schemes do not fit the child is in disequilibrium. Piaget called the moving between equilibrium and disequilibrium equilibration.