The OECD Nuclear Energy Agency (NEA) has coordinated an international initiative to develop understanding and guidelines related to the long-term preservation of records, knowledge and memory (RK&M) for radioactive waste repositories. After seven years of work, it has come to a close in 2018. Currently, the "Final Report of the RK&M Initiative" is in the final process of publication [the status/sentence will be updated in early 2019]. It includes a historical review, sets out the RK&M fundamentals, presents a menu of approaches and mechanisms of RK&M preservation, and finally provides suggestions on how to develop a systemic strategy aimed at embedding radioactive waste repositories in society over extended periods of time. This paper highlights the "multi-dimensionality" of RK&M preservation: Multiple timeframes need to be considered, multiple transmission modes explored, and multiple actors brought together. The latter seems to be the primary aspect to be considered in the discussion about future (international) cooperation in the RK&M preservation field.
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