Controlling is an important managerial function that helps organizations achieve their goals. It involves establishing standards, measuring performance, comparing performance to standards, and taking corrective actions when needed. Control techniques include critical point control, management by exception, and Kaizen. Budget control is another key technique that involves establishing budgets and monitoring performance against budgets. Other techniques discussed are PERT, CPM, MIS, JIT, TQM, and bottom-up versus top-down management. Overall, controlling helps regulate organizational activities to ensure goals are met efficiently and resources are optimally utilized.