Incwadi Yokufundisa Yokuthumela Impahla (i-SLI) idokhumenti ebalulekile ekhishwe umthumeli, eqondisa umthumeli wempahla noma umthwali ekuphathweni nasekuthuthweni kokuthunyelwa. Ngomongo wase-US, i-SLI iyisibopho kukho konke ukuthunyelwa okuvela e-US futhi kufanele iqedwe ngaphambi kokuqoqwa kwezimpahla, futhi isebenza njengedokhumenti yokugunyaza ukuze umthumeli wempahla asebenze njengommeleli womthumeli wokulawula ukuthekelisa kanye nezinjongo zamasiko, okuhlanganisa ukusebenzisa izindlela ze-elekthronikhi ezifana ne-Automated Export System (AES) ukuze kudluliselwe Ulwazi Lwe-Electronic Export (EEI).
I-SLI ibalulekile ekuhambisaneni nemithethonqubo futhi ngokuvamile ihlanganisa imininingwane efana nolwazi lokuxhumana lomthumeli kanye nothumeli, umzila wokuthunyelwa, ama-Incoterms, ubukhulu nesisindo sokuthunyelwa, incazelo yezimpahla, namakhodi ahambisanayo njengezinombolo ze-HS ne-UN, lapho kusebenza khona.
