The fracture properties of structural steels are sensitive to strain rate; this characteristic is responsible for most catastrophic failures of structures in these materials. The potential for the initiation of fast fracture can be predicted by the recently developed technology of linear elastic fracture mechanics (LEFM) which has provided the basis for an analytical approach to fracture resistance and structural integrity. Unfortunately, for routine engineering design use, the basic material parameter for plane-strain fracture toughness (---) is either impossible or too expensive to obtain by direct measurement. Therefore, to make fracture mechanics a viable engineering design tool, empirical correlations between practical dynamic test results and the basic parameters are needed. The attributes and limitations of the Charpy, Drop Weight-Nil Ductility Transition Temperature, Drop Weight Tear, and Dynamic Tear tests are discussed with respect to providing information useful in structural integrity analyses.