《元史·本纪·卷三十三》
中书省臣上言说 ：按旧制规定，在朝官员以三十月为一考，外任官员则以三年为满。
中书省臣言： 旧制，朝官以三十月为一考，外任则三年为满。
The ministers of the Secretariat informed the emperor: under the old system, the court officials would be evaluated every 30 months while the officials serving outside the court would be evaluated every three years.