In this chapter, we summarise, contrast and critically appraise the main theories offered in the various literatures which attempt to answer the core questions identified in the introduction. There are a number of traditions represented in these literatures and they each provide rival accounts of ‘networks’. At their most basic, these rivals differ in what they define as a network. For example,
... [Show full abstract] strict sociometric accounts allow any system of linkages between nodes to be a network (White, 1981, 2001; Knoke, 1990). Others define a network in ways that specifically exclude certain forms – such as hierarchical relationships – in favour of internally egalitarian relations (Bradach and Eccles, 1989; Powell, 1990). Broadly, the definitions vary in whether links in the network are seen as loose or tight, weak or strong, bounded or unbounded, and formal or informal.