Book excerpt: The proceedings of a specialists' meeting organised by the IAEA and published under the auspices of EGF. Contents include - model computations and experiments on the structural integrity of components containing part-through cracks, experience in comparison of large and small fracture mechanical specimens, dynamic large scale testing with a 12 MN-high speed propellant driven tensile testing machine, crack stability in centre cracked plates subject to uniformly distributed loadings, the need for large scale testing in the UKAEA and experimental and numerical investigations of stable crack growth of an axial surface flaw in a pressure vessel.