The present MS-EDA method includes three computational steps: (1) the calculation of excitation energies of monomers, (2) the determination of the reference states for energy analysis for block-localized intermediate states, and (3) the evaluation of excitation energies of the fully delocalized dimer complex. The results from both steps (1) and ( ) can be validated by comparison with results from TDDFT or MCSCF calculations as well as experimental data. TDDFT is adopted in this work to determine the excitation energies of the excimers. Thus, MS-EDA may be regarded as an analytical tool to interpret the numerical results from TDDFT calculations.