(27)It is necessary in laying down such criteria that this Directive clarifies how the global exposure can be calculated, including by using the commitment approach, the value at risk approach or advanced risk measurement methodologies. It should also lay down the main elements of the methodology according to which the management company should calculate the counterparty risk. In applying those rules, account should be taken of the conditions under which those methodologies are used, including the principles to be applied to such collateral arrangements to reduce the UCITS’ exposure to counterparty risk as well as the use of the hedging and netting arrangements, as developed by competent authorities working within the Committee of European Securities Regulators.