Classifications are used for statistical purposes se and present process of organization of information into categories or classes so data can be clearly analyzed or understand.  They are one of the most important tools in the process of collecting the data. Statistical office of Montenegro- MONSTAT uses set of national classification, which are harmonized with EU standards, and classifications as well as other international classifications. They are revised in regular intervals and they are adjusted to changes of social and economic conditions.

We can say that Statistical classifications are:

• Organizational categories which are strict and detailed and it is possible to collect and present them as information in different levels of aggregation based on available data,
• detailed,
• mutually excluding –each phenomena or subject can be classified in only one category of classification,
• Dedication of different categories of classification is in accordance with methodological principles