Group dynamics involves how people interact in groups and is influenced by personality, power, and behavior. It helps groups work effectively. There are formal groups structured for tasks and informal groups that emerge for interests. Small groups interact more but large groups have more resources. Bruce Tuckman identified 5 stages of group development: forming, storming, norming, performing, and adjourning. Group cohesiveness and norms also impact dynamics. Managing social loafing and maintaining performance are important.