4.19. It should be recognized that different facilities will accommodate different types of radioactive waste with different levels of hazard potential. Principle 3 (in para. 3.15) in Ref. IAEA Fundamental Safety Principle (2006) states that “Safety has to be assessed for all facilities and activities, consistent with a graded approach.” This is further detailed by the following recognition in Principle 5: “The resources devoted to safety by the licensee, and the scope and stringency of regulations and their application, have to be commensurate with the magnitude of the radiation risks and their amenability to control” (para. 3.24 of Ref. IAEA Fundamental Safety Principle (2006)). Consequentially, “The extent and complexity of [safety] assessment will vary with the type of facility and will be related to the hazard potential of the waste” (para. 1.24 of Ref. [IAEA SSR-5 (2011)]). Furthermore, the level of detail of the safety assessment performed for each step of the development and operation of a disposal facility will vary depending on the magnitude of the risks. As a consequence of the iterative approach to the development of the safety case, the relative importance of the arguments that are included in the safety case, and the level of scrutiny to which they are subjected by the regulatory body and other interested parties (which may change over time), should be commensurate with the potential hazard. Further guidance on the application of the graded approach to the development of the safety case is provided in paras 6.23?6.28.