In this paper some limit equilibrium methods of slices are reviewed. Also, a general limit equilibrium method of slices is introduced (Furuya, 1986) and is examined by comparing with the Morgenstern & Price and the Spencer methods. The moment equation of this method is derived from the equilibrium of resultant vertical and horizontal inter - slice forces. Methods to calculate pore water pressure are also discussed as related to buoyancy under steady seepage flow conditions.