The evolution of the interest rates is a source of important information for the monetary policy of the Euro system. In order to harmonize the statements of the rates applied by the monetary financial institutions, the ECB decided to standardize the definitions, the methods of calculation, the periods of measurement and the procedure of selection of the monetary financial institutions by the national central banks. This harmonization is described in the European regulations 1072/2013 and 756/2014. The national transcription of the legal texts as well as the selection of the credit institutions is described in the following documents.