To search the classification, or code small volumes of data interactively, use the Classification Code Finder. Use a coding tool to code large volumes of data by downloading the Classification Coding System.
The standard classification of language is a hierarchical classification of three levels. Level 1 of the classification has 24 categories, level 2 of the classification has 43 categories and level 3 has 134 categories – excluding residual categories. The residual categories are defined in Glossary and references.