The ratio of notch-tensile strength to tensile-yield strength (the notch-yield ratio) is correlatable with plane-strain fracture toughness, K^Ic. As a result of that fact and relative simplicity of notch-tension testing, it is suitable for plant quality control testing for fracture toughness. The test procedures and quality control testing practices are described, and data showing the correlation between K^Ic and notch-yield ratio from both ½ and 1 1/16-in.-diameter notched tension specimens for several aluminum alloys are presented. The 1 1/16-in.-diameter specimen provides a more discriminating correlation at high toughness levels than does the ½-in.-diameter specimen. It is emphasized that this is not a procedure for estimating K^Ic directly, but for providing assurance that K^Ic equals or exceeds a stated value.