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Key theorists
Gustave Le Bon was a French social psychologist whose seminal study, The Crowd: A Study of the Popular Mind (1896) led to the development of group psychology.
Sigmund Freud 's Group Psychology and the Analysis of the Ego, (1922) based on a critique of Le Bon 's work, led to further development in theories of group behavior in the latter half of the twentieth century.
Kurt Lewin (1943, 1948, 1951) is commonly identified as the founder of the movement to study groups scientifically. He coined the term group dynamics to describe the way groups and individuals act and react to changing circumstances.
William Schutz (1958, 1966) looked at interpersonal relations from the perspective of three dimensions: inclusion, control, and affection. This became the basis for a theory of group behavior that sees groups as resolving issues in each of these stages in order to be able to develop to the next stage. Conversely, a group may also devolve to an earlier stage if unable to resolve outstanding issues in a particular stage.
Wilfred Bion (1961) studied group dynamics from a psychoanalytic perspective, and stated that he was much influenced by Wilfred Trotter for whom he worked at University College Hospital London, as did another key figure in the Psychoanalytic movement, Ernest
References: • Bion, W. R. 1961. Experiences in Groups: And Other Papers. Tavistock. Reprinted, 1989 Routledge. ISBN 0-415-04020-5 • Forsyth, D.R • Freud, Sigmund (1922) Group Psychology and the Analysis of the Ego. New York: Liveright Publishing. • Homans, G • Le Bon, G. (1896) The Crowd: A Study of the Popular Mind. London: Ernest Benn Limited. • Lewin, K — (1948) Resolving Social Conflicts: Selected Papers on Group Dynamics. New York: Harper & Row. • Lui and Chan (2008) Software Development Rhythms, John Wiley and Sons • Peck, M.S. 1987. The Different Drum: Community-Making and Peace. New York: Simon and Schuster. ISBN 0-684-84858-9 • Schutz, W • Tuckman, B. 1965. Developmental sequence in small groups. Psychological bulletin, 63, 384-399.