When doing research on Foreign Trade it is helpful to understand definitions of frequently used terms and the various classification systems used to collect data. Below are some basic guides and descriptions of the classification schemes.
What is the SITC Classification?
HTS/SIC/SITC/NAICS/END USE Description Lookup
Select and Display a table of codes with descriptions.
North American Industry Classification Codes(NAICS)
Classification system used to collect government statistics.
Tariff Act of 1930. Title I, Harmonized Tariff Schedule of the United States (Online)
The USITC (Office of Tariff Affairs and Trade Agreements) is responsible for publishing the Harmonized Tariff Schedule of the United States Annotated (HTSA). The HTSA provides the applicable tariff rates and statistical categories for all merchandise imported into the United States; it is based on the international Harmonized System, the global classification system that is used to describe most world trade in goods.