The system approach views industrial relations as a system of interacting parts. John Dunlop developed this approach in the 1950s. Key elements of Dunlop's system model include actors (employers, employees, unions/courts), contexts (technological, economic, societal), ideology, and rules. The actors interact and negotiate within this environment framework. Features include actors located within an environment, interacting/negotiating, and interdependence where no single actor can act autonomously. A stable system requires congruence between each actor's views of other actors' roles and the overall system. Criticisms include focusing on structure over processes, formal over informal rules, and being static rather than dynamic.