Controlling functions involve measuring a characteristic of an organization's performance, comparing it to plans, and taking corrective action to address any deviations. The characteristic can be an output, condition, or other factor. Control determines if correction is needed by assessing variations from what was planned. It aims to regulate day-to-day operations relative to schedules, specifications and costs. Control systems can be complex, involving both human and automated elements. Evaluation of control aims to improve organizational effectiveness and determine if changes are needed to the control process itself.