08afeb41_Model___UNECE_Statistics_Wikis__Object
[Group] Concepts [Definition] Unit of thought differentiated by characteristics [Explanatory Text] ISO 1087-1 defines Concept as a "unit of knowledge created by a unique combination of characteristics". First, the term knowledge is poorly defined, and the word thought seems to capture the idea more cleanly. Second, different systems may try to capture the same thought but depend on different characteristics (i.e., attributes). For instance, typical demographic surveys care about age, sex, income, ethnicity, and education of persons. However, persons in a justice survey are either criminals or victims. [Object] 
Concept
Annex C Glossary - Generic Statistical Information Model - UNECE Statistics Wikis