(9)In order to provide both institutions and competent authorities with evidence that an institution's operational risk measurement system is reliable and robust and generates more credible operational risk own funds requirements than a simpler operational risk regulatory methodology, competent authorities should verify that the institution has compared the operational risk measurement system against the Basic Indicator Approach or the Standardised Approach for operational risk laid down in Articles 315, 317, and 319 of Regulation (EU) No 575/2013 over a determined period of time. That period of time should be sufficiently long for the competent authority to establish that the institution meets the qualitative and quantitative standards laid down in the Regulation (EU) No 575/2013 for the use of an AMA.