What is it that howard becker defines as the study of people "doing things together"? social psychology sociology social expectations family?

Howard Becker defines sociology as the study of people "doing things together". Howard S. Becker (born April 18, 1928, Chicago, Ill., U.S.), is an American sociologist known for his theoretical contributions , but also  practical works on methods of social research.He developed aspects of a sociology of writing in Writing for Social Scientists (1986).

"social stratification refers to the way people are ranked and ordered in society. in western societies, stratification is primarily seen and understood as a result of socioeconomic status, which produces a hierarchy in which access to resources, and possession of them, increases from the lower to the upper strata"

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