(8)Critical services should be the underlying operations, activities and services performed for one (dedicated services) or more business units or legal entities (shared services) within the group which are needed to provide one or more critical functions. Critical services can be performed by one or more entities (such as a separate legal entity or an internal unit) within the group (internal service) or be outsourced to an external provider (external service). A service should be considered critical where its disruption can present a serious impediment to, or completely prevent, the performance of critical functions as they are intrinsically linked to the critical functions that an institution performs for third parties. Their identification follows the identification of a critical function.