A toddler's mental model for a 'dog' is a furry, four-legged animal that barks. When the toddler sees a cat for the first time, they point and say 'dog!' A parent corrects them, saying, 'No, that's a cat. It meows.' After this experience, the toddler's mental model for animals changes to include a new category for 'cat' that is distinct from 'dog'. This adjustment of the toddler's mental model is a clear example of what cognitive process?