8.13. Unexpected results may also be indicative of new information that is not reflected in the safety case. Such new information will generally be associated with features, events and processes that are not well understood, or features, events and processes that were previously not considered to be of importance. If it is determined that the unexpected results fall within this category, the monitoring and surveillance programme should be revised and implemented to further investigate the issue. In some cases it may be appropriate to initiate new research to better understand the unexpected results. The safety case should be updated to reflect the new knowledge. When unexpected results occur, they may raise concerns with the regulatory body, and may influence the confidence of concerned parties in the safety of the disposal facility. In this regard, the need for proper, transparent and honest communication should be emphasized to maintain credibility.