One of the key responsibilities for any supervisor or manager is making sure employees are performing their jobs in a satisfactory manner. When employees are doing a good job, it is important to recognize their contributions and to let them know their hard work is appreciated. However, when an employee's performance is below expectations or his or her conduct on the job is not acceptable, the supervisor or manager must act promptly to correct the situation. Acting promptly includes communicating with the employee so that he or she is aware of the problem and what must be done to correct it, as well as imposing some kind of sanction or disciplinary action. Even though this sounds simple, disciplining employees is one of the hardest things a supervisor or manager must do.