7.12. Irrespective of the documentation structure adopted, there are key attributes and considerations that should be considered throughout the process of developing the documentation. These include the following:@@- All documents produced in the context of the safety case, whether for regulatory approval, for information or promotion, should convey a consistent message about safety issues. In other words, the message should remain the same and should not be changed to suit the expectations of a particular audience. The messages contained in annexed documents and promotional material should be consistent with the main documentation of the safety case13. @@13) The need for consistency does not preclude emphasizing different arguments depending on the audience, as people with different backgrounds may be convinced by different arguments.@@- The main documentation of the safety case should provide sufficient information for the key safety arguments and the evidence supporting them to be clearly understandable.@@- The documentation should show that the safety case is based on sound scientific evidence and arguments using established technical experience and analyses.@@- The documentation should be freely accessible and uncertainties and limitations as well as their implications for safety should be acknowledged.@@- The documentation should be well structured, transparent and traceable. @@- The documentation should be transparent such that the information is made readily available to interested parties, by being clear and understandable, and by clearly presenting the justification and rationale behind key assumptions.@@- The documentation should be such that the procedures followed and the key decisions taken in the development of the disposal system and the safety case are traceable. This should include showing how follow-up actions and programmes are put forward at early stages to confirm assumptions made or how unresolved uncertainties have been addressed and/or will continue to be addressed. It should also be shown how key decisions have been documented and recorded by including a clear referencing system. @@- The documentation should also clearly indicate the need to pass information on to future generations regarding the measures for institutional control.@@- The safety assessment methodology should be well structured, transparent and traceable. It should enable the regulatory body and other technical reviewers to follow the logic and understand the assumptions used in the assessment easily and, where desired, to reproduce the assessment results.@@- The assessment should provide a full description of the practical methods used in order to identify and reduce uncertainties, and to identify the assumptions and uncertainties that impact the most on safety.