The addition of the solutes cadmium, indium, and tin to silver increases the probability of deformation faults &agr; in filings from 3×10−3in pure silver to a maximum value of 45×10−3at the highest concentrations of solute. In addition, the twin fault probability &bgr; measured from center of gravity displacements varies from 10×10−3for pure silver to 30×10−3for the alloys highest in tin or indium concentration. Lattice parametersahklwere determined from all available reflections of the cold‐worked and annealed specimens and plotted as a function of cos2&thgr;/sin&thgr;. By relating the large scatter of the individualahklto the occurrence of deformation faults in the deformed material, the true lattice parameter,a0(CW), and the deformation fault probabilities &agr; of cold‐worked materials could be determined. There was an apparent decrease in lattice parameter of the deformed Ag‐Sn alloys which was largest (∼0.1%) for the greatest tin concentration (Ag‐9%Sn). Using Fourier analysis of line profiles, the effective particle sizes (De)hkland root mean square strains [⟨&egr;L2⟩av]hkl½were determined. The measured effective particle sizes were anisotropic [(De)111/(De)200=1.7] and are primarily a consequence of deformation and twin faulting. The values for the compound fault probability (1.5&agr;+&bgr;) from peak shift and asymmetry and from anisotropic particle sizes, i.e., from peak broadening, agreed rather well.