Teams have their own personality, moods, and emotions. We examined how people develop a group or team identity, and the nature of how group and individual identities interact. Members of teams differ in terms of how attached they feel to one another, and these attachment styles can affect the behavior and performance of the team. Teams feel and express emotions and, over time, team members develop similar chronic emotions due to the process of contagion. We’ve focused on how to build cohesion in teams, and we’ve examined the types of trust that characterize relationships. Finally, we explored the socialization process by which teams admit newcomers and how time may be studied in teams.