CPT
OPT
When: Before graduation When: Before or after graduation
Where: Specific employer Where: Appropriate employer
Approval to work: International Student Services Approval to work: International Student Services and USCIS
Processing time: See International Student Services Processing time: See International Student Services and 2 - 4 months at USCIS
Proof of work eligibility: Notation on page 3 of I-20 by International Student Services Proof of work eligibility: EAD Card issued by USCIS