The document discusses four main interpersonal and group process interventions: T-groups, process consultation, third-party intervention, and team building. T-groups are designed to provide experiential learning about group dynamics, leadership, and interpersonal relations. Process consultation helps groups assess and improve processes like communication and decision-making to help themselves. Third-party intervention addresses conflicts between two or more people. Team building examines elements of work groups like goals, structure, and relationships to improve effectiveness.