My children have never looked much like those described in most theories of cognitive development. I don’t mean that they are generally deviant or that they perform abnormally on conservation or class inclusion tasks. They generally seem more or less normal, and on the few occasions when I have presented tasks from the cognitive developmental literature, they have acted pretty much like the children described in the articles. Where my children are altogether different from the theoretical descriptions is in the variability of their thinking. Cognitive developmental theories generally depict age and thought as proceeding in a 1:1 relation. At an early age, children think in one way; at a later age, they think in another way; at a still later age, they think in a third way. Such descriptions are so pervasive that they begin to feel like reality. Young children are said to form thematic concepts; somewhat older ones to form chain concepts; yet older ones to form true concepts. The reasoning of young children is said to be preoperational; that of somewhat older ones concrete operational; that of yet older ones formal operational. Young children are said to have one theory of mind; somewhat older ones a different, more inclusive theory; yet older ones a more advanced theory still. The story is the same with characterizations of performance on specific tasks. In descriptions of the development of the concept of living things, 3- and 4-yearolds are said to think that anything that moves is alive, 5- to 8-year-olds that animals—and only animals—are alive, and older children that plants as well as animals are alive. In descriptions of the development of addition skill, kindergartners are said to count from one; first through third graders to count from the larger addend; fourth graders and older children to retrieve answers from memory. In descriptions of the development of serial recall strategies, 5-year-olds are said not to rehearse; 8-year-olds to rehearse in a simple way; 11-year-olds to rehearse in a more elaborate way. My children’s thinking has never looked as neat and clean as these 1:1 characterizations of the relation between age and thought.