This document discusses group behavior and formation. It defines a group as two or more individuals interacting to achieve common goals, and lists reasons groups form like security, status, and goal achievement. It differentiates groups from teams, noting teams have common commitment beyond shared goals. The document outlines formal groups deliberately created by organizations, and informal groups that develop spontaneously. It also explains Tuckman's five stages of group development: forming, storming, norming, performing, and adjourning.