In recent years, there has also been some interest in specifically developing KEDFs for sDFT and FDE. Grimmel and Visscher revisited GGA functionals in FDE and reoptimized the parameters of a family of PBE-like KEDFs for excitation energy shifts in bimolecular complexes. They found that such a re-parametrization does not improve with respect to other GGA functionals and that the local-density Thomas-Fermi functional provides results of similar accuracy. They concluded that there is not much room for improvement within the class of GGA KEDFs.