Please Note A basic understanding of the Harmonized Tariff Schedule of the US (HTSUS) and the General Rules of Interpretation (GRI) is required for this course. If you are not familiar with the HTSUS, tariff classification or the GRI, we recommend that you attend our class on Tariff Classification. You may sign up for Tariff Classification instruction here and take it prior to taking the USMCA course. The Tariff Classification course is relevant to importers, exporters, freight forwarders and customs brokers. Tariff classification supports use of USMCA and other free trade agreements, as well as application of Section 301 and Section 232 rules.