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Definition: Group Dynamics is a system of psychological processes and behaviors occurring within a social group (intragroup), or between social groups (intergroup).
The study of GD can be useful in understanding group decision making behavior, as well as in following the emergence and spreading of new ideas and technologies.
The term GD was conied by Kurt Lewin to describe the positive and negative forces within groups of people. GD can be summarized by the saying: the whole is greater than the sum of its parts.