Equilibrium is described as

• A. The balance between assimilation and accommodation to form new schemata
• B. A stage of development
• C. Understanding object permanence
• D. A type of play

Answer: (A)

Equilibration is the process that drives cognitive development by maintaining a balance between assimilation—using existing schemata to interpret new experiences—and accommodation—changing those schemata in light of new information. When a child encounters something that doesn’t fit, a period of disequilibrium occurs. To restore balance, the child either tweaks an existing schema or creates a new one, leading to a more advanced understanding. That balance between fitting new input into what’s already known and adjusting that knowledge to fit what’s new is what allows thinking to grow and become more complex over time.

It’s not a developmental stage, nor a specific achievement like understanding object permanence, nor a type of play.