Study Guide

Learning objectives

✓	Describe the purpose, structure, and governance of the Harmonized System
✓	Explain the obligations and rights of Contracting Parties under the HS Convention
✓	Identify the components of the HS Nomenclature and the role of the Explanatory Notes

The Harmonized System (HS) is the common name for an international goods classification system called the Harmonized Commodity Description and Coding System. It entered into force on 1 January 1988, under the auspices of the Customs Co-operation Council (renamed the World Customs Organization in 1994), an international customs body located in Brussels.

How the Harmonized System is structured (see also the section: Harmonized System Nomenclature → How an HS code is built)

Component	Description
Chapters (2-digit)	Broad product category. Chapters are generally groupings of similar or related headings.
Headings (3- and 4-digit)	The primary level of classification. Headings group related goods together. The first two digits indicate the chapters.
Subheadings (5- and 6- digit)	Subdivisions of most headings. They give separate treatment or identification to the more commonly traded goods within each heading.

The essence of the Harmonized System (HS) is to provide the world with a single, internationally standardised six‑digit code that identifies a commodity consistently throughout its economic life. One of the core objectives of the HS is to replace the many different product‑coding systems previously used across commercial sectors, thereby creating a common language for the naming and classification of goods. 

A word you will often encounter in the context of international trade is “nomenclature.” In simple terms, a nomenclature is a structured system for naming things in a consistent and organised way. The HS is exactly that: a global nomenclature for goods, designed to ensure that every product can be classified, described, and understood in the same way by Customs administrations, traders, and statistical agencies worldwide.