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the use of Fourier and line-breadth methods for the determination of stacking-fault parameters in hexagonal close-packed metals has been investigated. Greatest accuracy is probably obtained by Fourier analysis of the { 10i 1 } line, but analyses of other lines axe required in addition when more than one type of faulting is present. Line-breadth methods usually give satisfactory results, and are valuable in determining the predominant type of faulting. Spontaneously transformed cobalt powders often contain mainly growth faults, whereas specimens which have been deformed to complete the martensitic transformation contain mainly deformation faults. Specimens with mixed faulting have also been obtained; an alternative hypothesis, that the faults are 'clustered', will explain the line-breadth results, but not those obtained by Fourier analysis.

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