Final answer:
According to Piaget, the modification of existing cognitive structures based upon new information is best termed accommodation.
Step-by-step explanation:
According to Piaget, the modification of existing cognitive structures based upon new information is best termed accommodation. Accommodation refers to the process of changing one's existing cognitive structures or schemata based on new information or experiences. Piaget believed that assimilation and accommodation are two complementary processes that help individuals adapt and understand the world around them.