6.8. For the purposes of confirming performance of the disposal facility, monitoring should be carried out for key technical parameters of interest in both the operational and post-closure periods. This can be viewed as a part of the step-by-step process of development of the safety case, which continues after the issue of the operational licence during the operational period to progressively improve the predictability of the operational and/or post-closure performance of the disposal system. Such monitoring should provide additional data in support of the data used for the safety assessment, to enable the safety assessment to be updated and improved through the operational period. The regulatory body may require that a programme for performance confirmation is in place as part of the licence conditions for operation. In this way the operator may be obliged to resolve technical issues only during the period of operation rather than as a condition for the granting of a licence for operation. This approach can be used to manage residual uncertainties about technical issues at the time that the licence for construction is granted, but should not be a substitute for an appropriate level of regulatory scrutiny and careful consideration of uncertainties in the safety case early in the development of a disposal facility.