Step-in rights allow the client or a nominated third party the right to step-in and intervene, in particular to directly operate the outsourced services or to appoint a new operator. Circumstances where step-in rights may be contractually invoked may include supplier insolvency, a "force majeure" event which prevents or impedes the outsourced service provision, where the client believes that there is a substantial risk to the provision of the services, or where performance fails to meet a defined critical level of service. Suitable clauses in a contract may provide for the outsourced service provider to pay any additional costs which are faced by the client and specify that the provider's obligation to provide the services is annulled or suspended.