This approach is primarily concerned with social reasoning and judgment, with how children reason about social phenomena, not just what they reason. The how of social reasoning is called structure, what is reasoned about, content. Presented at the American Psychological Association, Chicago, 1975. (Author)

Human development from about ages 2 to 5 is presented in terms of the history of a child conceptualized in terms of stimulus and response functions and his interactions in current situations which consist of organismic, physical, and social conditions. The concepts describing the changes that occur during this developmental period, such as…