Controlling is an important management function that involves monitoring performance, comparing results to plans, and correcting deviations. There are three steps to the control process: 1) measuring actual performance, 2) comparing actual results to standards, and 3) taking corrective action if needed. Performance can be measured through various methods like observations, reports, and statistics. Based on the evaluation, managers may decide to take no action, correct performance, or revise standards. The goal of controlling is to ensure organizational goals are being met efficiently and effectively.