(4)Mappings of credit ratings for securitisation positions should give consideration to quantitative factors such as default and loss rates and the historical performance of credit ratings, as well as qualitative factor such as range of transactions, methodologies and meaning of rating categories. Nevertheless, it should be noted that the securitisation credit ratings apply to a wide range of transactions, which have historically performed in a materially heterogeneous manner during the 2007-2009 financial crisis. Further, as a result of the crisis, both ECAIs' methodologies and the Union regulatory approach to securitisation are undergoing changes and the securitisation framework is also the object of discussions at international level . In order to take into account these developments in the regulatory framework and the heterogeneous performance of securitisation credit ratings and to avoid disruption to the securitisation market, it is necessary to emphasise the qualitative aspects of the analysis of available quantitative data.