Generation IV reactors are being designed as nuclear systems with revolutionary features, offering higher levels of safety, economy, non-proliferation and sustainability than the current generation. This CD-ROM publication presents the proceedings of a technical meeting providing an overview of the progress in methods and technologies used for the irradiation testing of nuclear fuel achieved in the last five years. Emphasis is given to advanced techniques applied for the understanding of high burn up fuel behaviour of water cooled power reactors, but testing techniques applied or to be developed specifically for new fuel and structural materials considered for Generation IV systems are also discussed.