The objective of this report is to provide information, based on experience gained so far, on how to identify, maintain and update the necessary records for the decommissioning of nuclear facilities. Record keeping has proven to be of vital importance, since its lack may result in the costly misallocation of resources and may cause safety problems. Contents: 1. Introduction; 2. Scope and objectives; 3. Design and operational data requirements for decommissioning; 4. Process of selecting decommissioning records; 5. Retention of decommissioning records; 6. Quality assurance; 7. The records management system; 8. Management of new records; 9. Summary; Appendix: Options for record storage media and retrievability; Annex I: Examples of national experience; Annex II: Lessons learned.