4.84. Complementary safety indicators may be compared with guidelines, criteria and reference values in order to judge the effectiveness of the performance of the disposal facility or of individual components. Reference values may be derived from a number of sources, such as legislation or regulations and other considerations, which may include:@@- Regulatory criteria concerning maximum permissible radionuclide concentrations in environmental media;@@- The results of sensitivity analyses conducted in the safety assessment (which may indicate that, for example, a particular minimum lifetime for a certain container is critical for the safety of the disposal system as a whole);@@- Independent consideration of the processes by which the safety functions of the disposal system are provided;@@- Societal values or expectations.