Post-Completion Optional Practical Training (OPT) is temporary employment authorization issued by U.S. Citizenship and Immigration Services (USCIS). The work students pursue while on Post-Completion OPT must be directly related to his/her/their major field of study. Post-Completion OPT may be used either 1) after the completion of a degree program or 2) after completion of all course requirements other than thesis, project or comprehensive final exam. Post-Completion OPT is generally issued for a duration of 12 months, but may be for less time if the student has previously applied and been granted Pre-Completion OPT.