In Piaget's theory, fitting new information into an idea the child already has is called:

1. Piaget named two processes by which a child adapts to new experience. 2. **Assimilation** interprets new information in terms of existing concepts (schemas). 3. **Accommodation** is the opposite move: the existing concept itself is changed. 4. Fitting new information into an existing idea is therefore assimilation. **Why not the others:** Equilibration is the balancing of the two processes; conservation is a concrete operational skill. _Source: Seifert and Sutton, Educational Psychology, 2nd ed. (2009, CC BY 3.0), Ch 2, section "Psychological constructivism: the independent investigator", p. 34_