The Standard Classification of Transported Goods (SCTG) consists of a blend of transportation characteristics, commodity similarities, and industry-of-origin considerations, designed to create statistically significant categories. It is a structured list that is defined at its less-detailed levels according to the Harmonized Commodity Description and Coding System (HS), and at more-detailed levels, according to patterns of industrial activity. Other factors in the definition of categories were transportation considerations such as volume, revenue, value, origin, and destination.