This document specifies a method for the determination of resistance to stress corrosion cracking (SCC) of magnesium alloys intended for use in structural applications (such as magnesium front end@ gearbox and clutch housing units@ steering column parts@ shift actuators@ valve covers and housings@ brackets and intake manifold blades@ electronic devices@ power tools and medical equipment). The method allows determination of the resistance to SCC as a function of the chemical composition@ the method of manufacture and heat treatment of magnesium alloys. The document is applicable to cast and wrought magnesium alloys in the form of castings@ semi-finished products@ parts and weldments and covers the method of sampling@ the types of specimens@ the loading procedure@ the type of environment and the interpretation of results. The document allows assessment of the relative performance of materials and products in environments containing chlorides or sulphates@ provided that the failure mechanism is not changed@ but does not qualify a material or product for service application.