(7)Article 7a(3), point (d), of Regulation (EU) No 648/2012 requires counterparties to ensure that trades that are cleared in the active account are representative of interest rate derivative contracts that are denominated in euro or Polish zloty or short-term interest rate derivatives that are denominated in euro and that are cleared at a clearing service of substantial systemic importance. According to Article 7a(8), second subparagraph, ESMA is to ensure such representativeness by selecting maximum three different classes of derivative contracts, subject to a limit of four maturity ranges, and by specifying the different trade size ranges, subject to a limit of three trade size ranges. The selection of classes of derivative contracts should ensure that the active accounts concerned capture a maximum of classes of interest rate derivatives already subject to the clearing obligation. It should further avoid that derivatives are aggregated into categories that would not share common and essential characteristics, while at the same time allowing for the possibility to better tailor the related representativeness of the transactions cleared in the active accounts to each specific market, taking into consideration their size, liquidity, growth and the level of activity of each clearing service deemed of substantial systemic importance in comparison to Union CCPs activity. Finally, the methodology for the selection of classes of derivative contracts should be flexible and future-proof, catering for market developments and adapting to the evolution of the degree of systemic importance of third-country CCPs and ensuring the related financial stability risks for the Union or for one or more of its Member States are sufficiently mitigated. For that reason, having considered the classes of derivatives already subject to the clearing obligation, their respective liquidity and relative importance, three classes should be defined for OTC interest rate derivatives denominated in euro, two classes for OTC interest rate derivatives denominated in Polich zloty and two classes for short-term interest rate derivatives denominated in euro.