An efficient method of dual criteria design of inelastic frames for specified seismic design strain and ductility is presented on the basis of the authors' method of seismic strain-constrained design of elastic frames. The latter enables one to find the set of bending stiffnesses of a frame such that the SRSS strain of every member with a specified depth due to a set of design spectrum-compatible earthquakes would be equal to a specified value. Each frame designed for a set of specified smooth distribution of column-end strains and a set of specified uniform distribution of beam-end strains is shown to exhibit a fairly uniform distribution of storey ductility indices under Level 2 design earthquakes. These characteristics are utilized conveniently in the method of dual criteria design of an inelastic frame for specified design strain and ductility.