Takada has identified that superconductivity is brought about by the ferroelectric phonon in the strontium titanates (SrTiO3) [1] and the alkali-ion active phonon mode in the c-direction producing local electric fields in the alkali-metal intercalated graphite (AC8) [2].    In relation to the alkali-metal-doped fullerides (A3C60), Takada and Hotta have proposed a concept of occurrence of superconductivity in the polaron-liquid phase realized by the competition between the attractive interaction due to the exchange of surface phonons of a buckey ball and the Coulomb repulsion [3,4]. We have shown that all the experimental results on superonductivity in the fullerides can be explained in a unified fashion from this viewpoint [5,6].    Takada has also considered a possibility of bipolaronic superconductivity with an intention to resolve curious behaviors observed in CuCl and CdS [7].