USING THE CLASSIFICATION
It is important when validating input codes at editing stage, manipulating data, and deriving output items, that all valid codes are included in every specification. The full range of valid codes consists of all the codes in the classification structure plus all supplementary codes.
CODING, STORAGE AND PRESENTATION OF DATA
Data should be collected, classified and stored at the language (four-digit) level of the classification to allow flexibility of statistical output and more detailed analysis. It also maintains information for future use and enables comparison with previous data using different classifications.
In some instances, concerns about confidentiality or standard errors may not permit the collection or output of data at the finer levels of the classification. The use of a standard classification enhances data comparability even though it may not always be possible to disseminate data at the most detailed level.
The hierarchical structure of the classification provides users the flexibility to output statistics at the level of the classification which best suits their particular purposes. Data can be presented at the broad group level, narrow group level, or the language level. Also, significant languages within a narrow group can be presented separately with the remaining languages of the narrow group aggregated.