Since the 1920s, the term has been in general use in social science, especially as a variable whose sub-components needed to be distinguished in relationship to other sociological variables, as well as in academic literature, as result of the rising influence of structuralism. The concept of "social stratification", for instance, uses the idea of "social structure" to explain that most societies are separated into different "strata" (levels), guided (if only partially) by the underlying structures in the social system. It is also important in the modern study of organizations, as an organization's structure may determine its flexibility, capacity to change, etc. In this sense, structure is an important issue for management.