When a manager monitors the work performance of workers in his department to determine if the quality of their work is 'up to standard' this manager is engaging in which function?

When a manager monitors the work performance of workers to assess the quality of their output, they are engaging in the controlling function of management. This function involves evaluating performance against established standards, identifying any deviations, and implementing corrective actions to ensure that organizational goals are met. By doing so, the manager helps maintain quality and efficiency within the department.