ESAs published two draft Implementing Technical Standards (ITS) on credit assessments by External Credit Assessment Institutions (ECAIs).
By determining an objective approach for attributing risk weights to the assessments of ECAIs, as well as a prudential approach for those cases lacking factual evidence, these standards intend to ensure sound credit assessments contributing to financial stability in the EU.
http://www.esma.europa.eu/news/ESAs-define-risk-weights-credit-ratings-EU?t=326&o=home