8.6. Verification of compliance with performance based regulatory criteria, such as dose limits, will necessitate monitoring that provides insights into features, events and processes and system performance, and which provides information to support the safety case and safety assessment. Since approaches for meeting regulatory requirements of this type do not follow strict rules, there should be good and early communication between the regulatory body, operator and other concerned parties. This communication is necessary because the range and types of uncertainty are larger and more subjective than is the case for prescriptive regulatory requirements. Such uncertainties are resolved as much by the process by which they are addressed as by the monitoring data that support the analysis.