Group size is defined as the number of members in a group.

Group size in psychology refers to the number of individuals in a group. It is an important factor that can influence group dynamics, group decision-making processes, and individual behavior within a group.

The effects of group size on behavior and performance can vary depending on the specific task or situation. For example:

  • Social facilitation: The presence of others can enhance performance on simple or well-learned tasks, but impair performance on more complex or novel tasks. This effect tends to be stronger in larger groups.
  • Social loafing: Individuals may exert less effort in a group than when working alone, particularly on tasks that are perceived as unimportant or when they feel their contribution is not essential. This effect tends to be stronger in larger groups.
  • Group polarization: Group discussions can lead to more extreme attitudes and decisions than individuals initially held, due to the exchange of information and social comparison processes. This effect tends to be stronger in larger groups.
  • Groupthink: In highly cohesive groups, a desire for unanimity and conformity can lead to flawed decision-making and a failure to consider alternative perspectives. This effect tends to be more likely in larger groups.

The optimal group size for a specific task or situation depends on various factors, such as the nature of the task, the level of interdependence among group members, and the type of communication required. For example, larger groups may be more effective for brainstorming sessions or creative tasks, while smaller groups may be more effective for tasks that require close coordination and communication.


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