Groups require common goals, shared leadership, communication between members, and acceptance of all members. Group dynamics are influenced by intrapersonal forces within individuals, interpersonal forces between members, and environmental forces outside the group. Functional roles in groups include initiators, gatekeepers, compromisers, and harmonizers while non-functional roles are aggressors, blockers, and dominators. Conflict can be resolved through competition, accommodation, avoidance, compromise, or collaboration, and should be addressed constructively.