These EBMT reccomendations for reporting TBI^[56] was prepared by the EBMT management project group (European Union project number BMHI-CT94-0300 "Optimization of Procedures for Treatment of Hematologic Malignancies by Bone Marrow Transplantation from Volunteer Donors") as a result and conclusion of the contributions and discussions to the EBMT-EULEP-TBI meeting of Leiden (1982)^[10], to the ESTRO-TBI meeting of Baden-Baden (1986)^[51], to the ESTRO-EBMT-EULEP-TBI meeting of Den Haag (1998)^[53,54], taking into account reccomendations of the AAPM task group TBI^[6] and many review publications.

Basic ideas for the relevant physical parameters of TBI needed to be reported to the European and international registries (EBMT and IBMTR) were evaluated by the DGMP working group on physical aspects of TBI of the German Association of Medical Physicists^{[51,3,4,52,2]}.

The editors wish to thank all who helped to prepare these reccomendations for reporting TBI, specially to Dr. Sánchez Nieto and Dr. Terrón who contribute very much in the elaboration of the brochure TBI prior BMT, the experts of the EBMT projects managing group, of the EULEP-EBMT-TBI doimetry task group and of the DGMP-TBI task group, as well as to the EBMT data management office, specially to Dr. P. Singrelin and Dr. C. Ruiz.

The editors