(17)This Directive provides for rapid and non-formalistic enforcement procedures in order to safeguard financial stability and limit contagion effects in case of a default of a party to a financial collateral arrangement. However, this Directive balances the latter objectives with the protection of the collateral provider and third parties by explicitly confirming the possibility for Member States to keep or introduce in their national legislation an a posteriori control which the Courts can exercise in relation to the realisation or valuation of financial collateral and the calculation of the relevant financial obligations. Such control should allow for the judicial authorities to verify that the realisation or valuation has been conducted in a commercially reasonable manner.