This document discusses various theories of group formation, including propinquity, interaction, balance, and exchange theories. It also outlines the five stages of group formation: forming, storming, norming, performing, and adjourning. Additionally, it describes the punctuated-equilibrium model of group development and identifies characteristics of groups such as social interaction, stability, and common interests/goals. The document also discusses aspects of group structure including norms, roles, status, and cohesiveness.