Final answer:
Accommodation in Piaget's theory of cognitive development is the restructuring of existing ideas to encompass new experiences.
Step-by-step explanation:
In the context of Piaget's theory of cognitive development, the process where old ideas are restructured to include new experiences is known as accommodation. When we look at the other options: assimilation is when new experiences or information are integrated into existing ideas without changing the structure of the schemata. The concept of conservation refers to the understanding that even if the appearance of something changes, its quantity remains the same. Lastly, object permanence is the understanding that objects continue to exist even when they are not observed. As we apply these Piagetian concepts, it's clear that accommodation is the answer which involves a modification in one's mental representations or schemes in response to new information.