Requirements for NRT Trainees Required courses Completion of the courses below is required for the 3DES NRT program. SMS 598 / ANT 597: Convergent Approaches to Ecosystem Science (3 credits), Year 1 (Fall) ANT 597 / EES 590: Engaging Cross-Cultural Science (1 credit), Year 1 (Spring) SMS 598: Ecosystem Science Seminar (1 credit), Annually (Spring)