6.13. Monitoring in the post-closure period should include informing the relevant stakeholders of the decision to move from active institutional control to passive institutional control (established by means of, for example, site markers and maintenance of ‘corporate memory’). At this stage in the development of the disposal facility, the goal is to identify when conditions at the site are suitable for a revision of the licence, to allow termination of monitoring activities and maintenance and active control of the site. For example, for surface based disposal facilities, a decision to initiate passive institutional control could be taken when it is considered that long term safety can be ensured by reliance on restrictions on landfill usage, and when the reduction in radiotoxicity of the waste means that the radiological risk associated with human intrusion is reasonably low. This could be considered a step-by-step approach to full long term passive safety.