 Group behavior (as opposed to individual behavior) is characterized by features such as a perceived similarity between group-members, cohesiveness, a tendency to cooperate to achieve common goals, shared attitudes or beliefs, and conformity to group norms. Once an individual self-categorizes as member of a group, she will perceive herself as “depersonalized” and similar to other group-members in the relevant stereotypical dimensions. Insofar as group-members perceive their interests and goals as identical—because such interests and goals are stereotypical attributes of the group—self-stereotyping will induce a group-member to embrace such interests and goals as her own. It is thus predicted that pro-social behavior will be enhanced by group membership, and diluted when people act in an individualistic mode (Brewer 1979).