The document defines a group as two or more individuals interacting to achieve common goals, who develop shared attitudes and perceive themselves as part of the group. It lists key characteristics of groups as having collective identity, interaction, shared interests/goals, rules and guidelines for behavior. Groups allow pooling of knowledge and skills to accomplish difficult tasks, and provide status, protection from threats, and fulfillment of social and emotional needs. The document also outlines Tuckman's stages of group development and references several theories of group formation and dynamics.