Different subunits within an organization may confront different external demands. To cope with these various environments, organizations create specialized subunits with differing structural features. For example, some subunits may exhibit higher levels of formalization than others; some may be more centralized in decision making; some may be oriented to longer planning horizons. The more varied the types of environments confronted by an organization, the more differentiated its structure needs to be.

p. 89 (2001: 103) - ''Institutions and Organizations., 1995