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We consider single band of conduction electrons interacting withdisplacements of the transitional ions.In the classical regime strong couplingtransforms the harmonic elastic energy for an ion to the one of the well withtwo deep minima,so that the system is described in terms of Ising spins.Inter-site interactions via the exchange by electrons order spins at lowertemperatures. Extention to the quantum regime is discussed. Below theCDW-transition the energy spectrum of electrons remains metallic because thestructural vector Q and the FS sizes are not related.Large values of the CDWgaps seen in the tunneling experiments find their natural explanation as due tothe deep energy minima in the bound two-well electron-ion complex.

Strong electron-lattice coupling as the mechanism behind charge densiy wave transformations in transition-metal-dichalkogenides