6.25. Various criteria may be used to help in determining the amount of effort that should be expended on the safety case and assessment or review of a particular disposal facility, component of the disposal system (e.g. on characterization of a particular barrier) or process influencing the performance of the disposal system. Reference [3] identifies the following criteria to be taken into consideration in the application of a graded approach: the possible radiation risks and the maturity and complexity of the type of facility. The use of these criteria in safety assessment for waste disposal facilities is discussed in paras 6.26-6.28.