ABSTRACT
Thinking is very varied: it includes working out sums, explaining events, solving problems, and making models. Some psychologists try to explain what is happening when people are thinking, while others are more concerned with how cognitive abilities develop. For example, Piaget gave an account of how cognition develops in children, assuming the last stage of his developmental theory to be the beginning of a description of adult thinking. Others, seeing thinking as the mental manipulation of imagined entities in the Mental Models tradition, have largely thought about the thinking and reasoning of adults, and have not been concerned with development. Despite these differences, there are some similarities in their work.
