Controlling is the process of monitoring activities to ensure they are accomplished as planned and correcting deviations. It is a systematic, continuous process that involves establishing standards, measuring performance, comparing actual results to standards, and correcting deviations. Planning precedes controlling, and controlling ensures plans are followed. The controlling process establishes measurable standards, measures performance, compares actual results to standards, and corrects any deviations through actions like revising plans or processes. There are different types of controls, including feed forward controls to prevent deviations, concurrent controls to monitor ongoing work, and feedback controls to review work after it is done.