Piaget introduced several other important concepts. According to Piaget, cognitive development occurs from two processes: adaptation and equilibrium. Adaptation involves the child's changing to meet situational demands. Adaptation involves two sub‐processes: assimilation and accommodation. Assimilation is the application of previous concepts to new concepts. An example is the child who refers to a whale as a “fish.” Accommodation is the altering of previous concepts in the face of new information. An example is the child who discovers that some creatures living in the ocean are not fish, and then correctly refers to a whale as a “mammal.” Equilibrium is the search for “balance” between self and the world, and involves the matching of the child's adaptive functioning to situational demands. Equilibrium keeps the infant moving along the developmental pathway, allowing him or her to make increasingly effective adaptations.
A brief summary of Piaget's four stages of cognitive development appears in Table 1.