Trait-based personality theories, such as those defined by Raymond Cattell define personality as the traits that predict a person's behavior. On the other hand, more behaviorally based approaches define personality through learning and habits.
This was one year after the first department of sociology was established at the University of Chicago. In 1919, a separate School of Sociology was created, and in 1930, the present Department of Sociology came into being. Following World War II, the department, along with the university as a whole, expanded rapidly. Before World War II the department had a masterâs program from which a handful of students had graduated.
Following Ward as president of the American Sociological Association was William Graham Sumner from 1908 to 1909. He also held the first professorship of sociology at Yale College, and in 1876, Sumner became the first to teach a course entitled sociology in the English-speaking world.