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Uniform Material Law (UML) is a handy and user-friendly method since only the tensile strength data of the material is needed for estimation of the strain-life curve, in contrast to other methods, such as four-point correlation method, universal slopes method, Mitchell's method, modified universal slopes method, which also require the data of the reduction in area or the fracture ductility of the material. On the other hand, the error level of UML estimations can be still decreased by refining the method. The objective of this thesis is putting forward a more refined method by extending conventional UML. Furthermore, a life prediction computation is carried out with the proposed extended UML and the results are compared to that of the conventional method. The results have proven that the maximum error is dropped down to 0.59% from 38% with the proposed extended UML method.