1) Organizational theory studies organizational structure to understand, predict, and control organizational effectiveness. There are four main contributing theories: classical, human relations, contingency/decision, and modern systems.
2) Classical theory, also known as scientific management theory, views organizations as machines with specialized worker roles. It focuses on principles of management and concepts of line and staff.
3) Human relations theory recognizes the psychological and social aspects of workers, emphasizing differences among individuals and importance of informal organizations within formal structures.
4) Contingency/decision theory holds that the most effective management depends on conditions in a particular situation, with no universally best approach.