Abstract: A method for evaluating the compaction, by means of a vibrator compaction device having mass Mvib and a bearing area F, of a preselected soil layer, for which a predetermined degree of compaction is desired, at a preselected depth l in a soil base having at least one layer disposed between an exterior upper surface and a hard bottom layer, thereby defining a vibrator-soil-base system, which includes the steps of: evaluating a desired volumetric mass &ggr;st of the preselected soil layer corresponding to the desired degree of compaction, which may be performed by measurement or by calculation using standard soil data; calculating a mass per unit area msoil of the preselected soil layer as a function of the desired volumetric mass; calculating the effective vibrating mass M of the vibrator-soil-base system as a function of the mass per unit area of the preselected soil layer and the mass of the vibrator; determining the natural oscillation frequency &ohgr;o of the vibrator-soil-base system when the preselected