This report documents the main results of the Conceptual Design Evaluation (CDE) on the International Fusion Materials Irradiation Facility (IFMIF), conducted during 1997 and 1998. Following the recommendations of the FPCC in January 1997, the activities proposed by the IEA/IFMIF; Subcommittee for the CDE phase were, according to the limited funding, to concentrate mainly on a critical evaluation of the design developed during the preceding Conceptual Design Activity (CDA) phase and on improvements of key devices and instrumentation tools. The IFMIF activities continues to be coordinated by the international leadership team already used for the CDA. This CDE report follows basically the work breakdown structure of the project and therefore has the four major sections Test Facilities, target Facilities, Accelerator Facilities and Design Integration. A major outcome of the CDE was, that in all areas the conceptual design was confirmed and extended, with no substantial changes.