02 / 20 Sections, divisions, groups and classes

Sections, divisions, groups and classes

Sections, divisions, groups and classes, how the four levels nest, and how to read an identifier at each level.

The four levels

1. Level 1 Section One letter
2. Level 2 Division Two digits
3. Level 3 Group Three digits
4. Level 4 Class Four digits

Guides in this cluster

• How do criteria change between levels?

  The criteria for classes, groups, divisions and sections, and why process matters most at class level.

• How do sections divisions groups and classes nest?

  How the four levels nest, the rule that each lower category belongs to one category above, and how to follow a path.

• How do you read a four digit code?

  How to split a four digit NACE code into division, group and class, find its section, and check its note.

• How many categories are there at each level?

  The adopted counts for sections, divisions, groups and classes, where the counts come from, and what they do not count.

• What does n.e.c. mean and why does digit 9 matter?

  The not elsewhere classified residual, the digit 9 pattern at group and class level, and how a residual completes a parent.

• What happens when a level is not split?

  Unsplit sections, divisions and groups, the zero code pattern, and why repeated headings are not errors.

• What is a class and why is it the most detailed level?

  What a class covers inside a group, how four digit codes work, and why class notes carry the finest distinctions.

• What is a division and why are there gaps?

  What a division narrows inside a section, how two digit codes work, and why some division numbers are unused.

• What is a group and how does it narrow a division?

  What a group covers inside a division, how three digit codes are formed, and how a group note sets its scope.

• What is a section and how is it identified?

  What a section groups, how a section letter works, and the 22 section headings in NACE Rev. 2.1.

• What makes categories exhaustive and mutually exclusive?

  Exhaustive coverage, mutually exclusive categories, and consistent allocation as the three characteristics of a statistical classification.

• Why is the section letter not in the numeric code?

  The separation of the section letter from the numeric code, the manual example, and the lookup it requires.

All guides or home.