The measurement of low, medium and high stacking fault energies is reviewed. Two methods appropriate to high fault energies are illustrated: (i) using a configuration which gives a specially large partial separation (ii) measuring the minimum size of screw dipoles. Other aspects of faults are mentioned: the importance of supplementary displacements to APB contrast and the possible implications of a strain field to ± g weak beam image asymmetry. Finally, the influences of temperature and composition on fault energies are discussed.

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