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A chart showing the network of interrelationships in a social group. It is usually constructed by inviting the group members to indicate their choices (or rejections) of one another, in response to a question such as the following, used in a classic study of an air force squadron: Which member of the squadron would you most like to have flying alongside you during combat? On the resulting chart, each group member is represented by a circle, with an arrow pointing from each circle to another, indicating which individuals chose which others, and it typically contains one or more stars (chosen by many others), one or more isolates (chosen by few), and often one or more cliques of mutually chosen individuals. The process of mapping social networks in this way, called sociometry, was introduced by the Romanian-born US psychiatrist Jacob L(evy) Moreno (1892–1974), whose books Who Shall Survive? (1934) and Sociometry, Experimental Method and the Science of Society (1951) made his ideas available to a wide audience. See also clique, isolate (1). [From Latin socius a companion + Greek gramme a line]

Subjects: Psychology.

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