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Persuasion and Social Influence in Groups

In this chapter, we examine social influence in groups by considering three distinct aspects of the complex process: the force, the source, and the message. The force instantiates the internal drivers that are activated to change group members' public and private positions. These drivers relate to a desire for accuracy (i.e., informational influence) or a desire for group harmony (i.e., normative influence). The source of social influence includes influence attempts from a majority or a minority of group members. Finally, influence messages can contain evidence in support of a position (i.e., informational statements) or group member preferences (i.e., normative statements). These aspects are frequently conflated with informational influence strongly linked to minorities and informational statements and normative influence similarly linked to majorities and normative statements. We review research consistent with this position. However, we argue that each aspect should be considered separately. Thus, we also explore how majorities and normative statements generate informational influence and how minorities and informational statements lead to normative influence.