Studies of fusion technology rely on calculations of the activation of materials arising from the operation of fusion devices that produce neutrons from the D-T reaction. In order for trust to be placed on the results of such calculations it is necessary that the inventory code and the data libraries are validated. This is done by comparing the predictions of the code system with activation measurements made on materials relevant to fusion technology in well characterised neutron fields. If the ratio of results from Experiment (E) and Calculation (C) is close to 1 then the data are validated. In other cases it may be possible to change the library data to improve the C/E ratio. As part of the EFDA Fusion Technology Programme the nuclear data library EAF has been developed. A series of measurements on fusion relevant materials in several complementary neutron fields have been carried out over the last few years. In addition, analyses of measurements performed outside Europe and outside the fusion programme have been undertaken. The results from these measurements are presented in a series of tables, which include the pathways responsible for production of the various radionuclides. In cases where a single pathway dominates it is possible to extract the effective cross section for the reaction and compare this with the library value calculated in the same neutron spectrum. For the calculations the latest version of the European Activation System (EASY-2005) is used. For each of four hundred and fifty-three reactions the EAF-2005 data are plotted. The graph includes the EAF uncertainty estimate and all the EXFOR experimental differential data. A C/E graph showing the available integral data is also given and, using these graphs, an assessment recommends if the reaction is validated or if changes to the EAF data should be made.