(32)To ensure the quality and reliability of ESG ratings, ESG rating providers should use rating methodologies that are rigorous, systematic, independent, continuous and capable of justification and that apply continuously and in a transparent manner. ESG rating providers should be encouraged to address both aspects of the double materiality principle. ESG rating providers should review ESG rating methodologies on an ongoing basis and at least annually, taking into account Union and international developments affecting the E, S or G factors. However, it is important to leave it to the ESG rating providers themselves to determine their own methodologies in accordance with those principles.