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.
Since the 1970s, sociology has noticeably transformed to include environmental forces in social explanations. Environmental sociology emerged as a coherent subfield of inquiry after the environmental movement of the 1960s and early 1970s. It has now solidified as a respected, interdisciplinary subject in academia.