(2)The criteria for the adoption of delegated decisions on prior permission to revert to the use of less sophisticated approaches and on prior permission for permanent partial use of the Standardised Approach should be simplified to ensure consistency and proportionality. To this end, for both types of delegated decisions, a uniform quantitative criterion based on 50 basis points on the Common Equity Tier 1 (CET1) capital ratio should be introduced to provide a clear measure of prudential impact. This criterion would also ensure that the ECB supervisory discretion is exercised in a proportionate manner, as the resulting change in the relevant decision-making process would be without prejudice to the substantive assessment required under Articles 149 and 150 of Regulation (EU) No 575/2013.