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network

network, social network, network theory
The term network refers to individuals (or more rarely collectivities and roles ) who are linked together by one or more social relationships, thus forming a social network. Examples of relationship links include kinship , communication , friendship , authority, and sexual contact. When individuals are represented as a point and links as a line, use can be made of graph theory as a model. The pairwise choices or relationship links can be arrayed in a table (called a sociomatrix) and the network drawn from this information is often referred to as a sociogram, which features centrally in sociometry , an elaborate but simple form of analysis pioneered by J. L. Moreno in the 1940s. The mathematical basis of network analysis is graph theory.
Initially, much work concentrated on small-group and institutional structures, describing individual points (stars and isolates) and forms of cohesion (clique-detection), but after the 1950s network analysis concentrated more on structural characteristics, such as ‘bridges’ (persons who formed the only link between strongly connected groups), ‘balance’ (the tendency of highly cohesive groups to polarize), and more refined definitions of cliques. In the 1960s and beyond, the analysis of social networks was strongly influenced by mathematical sociology under Harrison White, became much more highly theoretical, and now supports its own journal (Social Networks). White was the focus of a highly productive and innovative group of students and staff at Harvard University in the 1960s and 1970s, and is best known for insisting upon social rather than individualistic concepts (for example, movement of clergy vacancies versus movement of individual clergymen), and for developing block-modelling techniques for studying ‘structural equivalence’ of network members sharing the same pattern of contacts.
Three main foci typify work in the area of network analyses. Egocentric networks are rooted in a single individual and depend usually on that individual's report of his or her network (such as, for example, E. Bott's study of the effect of overlap between spouse's networks, Family and Social Network, 1957). Systemic networks are constructed from all the participants in the network, and concentrate on the structure of the network itself, as in Mark Granovetter's identification of the importance of the ‘weak tie’ in obtaining new job information-whereby new information comes not from those who are in one's close circle of interaction, but from those in one's network who have access to different sources (see Getting a Job, 1974). Finally, diffusion studies explore the shape and form of flows within the networks, as in the processes of innovation, rumour, or epidemiological diffusion. For an overview of the field as a whole see, Social Structure and Network Analysis (1982). See also balance theory.

Dictionary of sociology. 2013.

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