The compilation of this ISOPHOT Calibration Accuracies Overview would not have been possible without the help of many people working on ISOPHOT Calibration. We thank the members of the ISOPHOT Instrument Dedicated Team, the colleagues from the ISOPHOT Data Centre, the ISOPHOT Principal Investigator and the members of the ISOPHOT Consortium for their contributions. The development and operation of the ISOPHOT instrument as well as the operation of the ISOPHOT Data Centre are supported by funds from Deutsches Zentrum für Luft- und Raumfahrt (DLR, formerly DARA).