(6)Allowing contributors to use discretion creates a risk that different experts use it differently or that even the same expert uses it differently over time. Discretion also increases the vulnerability of the relevant benchmark to manipulation. It is therefore necessary that the policies established pursuant to Article 16(3) of Regulation (EU) 2016/1011 include a framework to ensure consistency in the use of judgement or the exercise of discretion and to reduce the risk of manipulation. Such a framework should impose an obligation to conduct regular internal reviews of the application of expert judgement. It should also identify types of information to be considered or not to be considered in order to frame the margin for discretion appropriately.