| Coined the term "class" in which people are organized in social ranks. | |
| Verstehen; Protestant Catholicism "produced the spirit of the modern form of industrial capitalism. | |
| Self-concept, formed in childhood is reevaluated and adjusted every time the person enters a new social situation. See Looking-Glass-Self. also distinguished between promary and secondary groups. | |
| Were concentrating on the city and on such social problems as crime, drug addiction, prostitution, and juvenile delinquency. |