Many formulas have been developed to describe the mechanical properties of various microstruc-tures, but there have been relatively few attempts  to combine such formulations directly withmulticomponent phase diagram calculations obtained by the CALPHAD technique. This paper describes some of the techniques used in developing such a combined approach as part of a morecomprehensive materials property program (MPP). The basic requirement is to describe themechanical properties of the overall alloy by determining the effect of each solute, and the grain size, on the mechanical properties of the various phases in a multicomponent system. As someof the coefficients are not readily available, methods have to be evolved that echo problemsalready faced by the CALPHAD community with respect to characterizing the thermodynamicsof metastable phases. It will be shown how the inter-relation of various mechanical properties,such as yield strength and hardness, can also be used  to produce self-consistent data. The promisingresults obtained for dual-phase materials can be considered a firm foundation for future work

on more complex systems.