Controlling is a management function that involves monitoring performance, comparing results to objectives and standards, and taking corrective action. The control process establishes objectives and standards, measures actual performance, compares results to the objectives and standards, and takes necessary action. There are various types of controls including preliminary, concurrent, and postaction controls. Controls can be internal, allowing self-control, or external involving direct managerial action. Organizations use various control systems like policies and procedures, compensation, and information systems to monitor performance and ensure objectives are met.