How Do You Trace a Code Across All 22 Sections?

Tracing a code across all 22 sections in ISIC Rev. 5, UN Statistics Division, starts not from a code, but from a clear description of the activity. The 22 sections, from A to V, cover agriculture, mining, manufacturing, utilities, construction, trade, transport, accommodation and food, publishing and content, telecom and computing, finance, real estate, professional, administrative, public, education, health, arts, other services, households and extraterritorial bodies. Once the section that best matches the activity is found, the reader moves down through division, group and class, checking wording and exclusions at each level.

Start with a sentence about the work, not with a number

The most common tracing error is to begin from a code remembered from an old form, a previous registration, or a neighbouring country’s list, and then hunt for wording that justifies it. Rev. 5 tracing works the other way round. Write one plain sentence first: what is produced or done, and for whom. Leave marketing language out of it. A unit that says it “delivers innovative content solutions” has not yet described an activity in a way a classification can use. A unit that says it publishes books for general readers has. From that sentence, find the section whose scope matches it in the UNSD structure. The 22 sections, from A to V, run from agriculture, mining, manufacturing, utilities, construction, trade, transport, accommodation and food, publishing and content, telecom and computing, finance, real estate, professional, administrative, public, education, health, arts, other services, households and extraterritorial bodies.

Move down one level at a time, and read the exclusions

Once a section is chosen, the work is deliberately slow: division, then group, then class, checking wording and exclusions at each level before moving on. Skipping a level is how a plausible section leads to a wrong class, because two classes in the same section can sound similar while their exclusions point in opposite directions. At each step, ask whether the entry covers the activity in full. A partial match is not a match.

• Describe the activity in plain words: what is produced or done, and for whom
• Find the section whose scope matches that description in the UNSD structure
• Move down through division, group and class, checking wording at each level
• Check exclusions and neighbouring entries before settling on a class

A small book publisher, traced slowly, including its printing

A reader tracing a small book publisher would describe publishing as the activity, find Section J for publishing, broadcasting and content in Rev. 5, UN Statistics Division, and then follow the division, group and class entries for publishing until the wording matches book publishing in full. The instructive part comes next. If the same unit also printed its own books, that printing activity would be traced separately, because Rev. 5 describes activities, and a unit can have more than one. Printing is manufacturing work with its own entry, its own inputs, and its own outputs, even when the printer and the publisher share an office, a payroll and a name. The same discipline applies to a university that teaches and researches, or a club that plays and broadcasts: trace each strand, then ask which is principal, rather than assuming the first strand found is the only one.

Four lookalike systems that are not ISIC

System a reader may confuse with ISIC	Why it is a different job
Rev. 4 codes, which may have changed in Rev. 5	An earlier edition of the same classification, so a familiar code may now sit elsewhere or have been split
National industry codes, which may differ from ISIC	A country’s own implementation, often more detailed, which must be mapped rather than assumed identical
Product codes, which classify goods rather than activities	A classification of things produced, not of the work that produced them
Occupation codes, which classify jobs rather than units	A classification of what individuals do, not of what a unit as a whole does

The table is a reading aid only. The UNSD publication wording remains the authority for any code. Its practical point is that a correct product code, occupation code or national code does not prove an ISIC code, and a Rev. 4 code carried forward without checking is one of the fastest ways to place a Rev. 5 activity in the wrong class. Two countries that both follow section, division, group and class, with the same UNSD wording, will place the same activity in the same place. Rev. 5, UN Statistics Division, contains 22 sections from A to V, with 87 divisions, 258 groups and 463 classes in total, so a careful walk down the structure usually resolves what a quick guess leaves ambiguous.

This guide explains a method for reading a statistical classification, and it does not by itself assign any reader a code, a principal activity or a registration outcome. For a real case, the national statistical institute or business register that holds the record should confirm the result before it is used.