7.3. Compliance with the requirements on the documentation of the safety case (see Section 3) presents a number of challenges because the target audience is composed of a wide range of interested parties with different needs, expectations and concerns. Another challenge is related to situations in which there are complex legal and regulatory requirements involving multiple regulatory agencies with different regulatory processes and where multiple levels of documentation are required throughout the stages of development of the disposal facility (e.g. environmental impact assessments). Given these challenges, there is no universal structure for the documentation of the safety case. The structure and the documentation process are influenced by the expectations of the intended audience, the decision that is under consideration, the stage of development of the facility, the national legislative and regulatory requirements as well as international guidelines on the development of the safety case.