In Piaget's terms, we would say that the child has a number of schemata. These schemata are analogous to concepts, categories, or cards in a file. When confronted with a stimulus, the child tried to "fit" the stimulus into an avail- able schema. Thus the child quite logically called the cow a dog, since the cow closely approximated a dog, and met all the child's criteria for what a dog was. The child not able to perceive the differences between a cow and a dog, but he was able to see the similarities. Schemata are intellectual structures that organize events as they are perceived by the organism into groups accord ing to common characteristics. They are repeatable psy chological events in the sense that the child will repeatedly classify stimuli in a consistent manner. If the child "consistently" classifies cows as dogs, we can infer something about the nature of the child's concepts (schemata of cows and dogs).