Slope stability assessment is traditionally based on data obtained from drilling, field and laboratory soil tests, and monitoring. Assessment accuracy can be improved by wider use of geophysical methods. Analysis of the results of electrical and seismic tomography compiled with data of engineering and geological research can get a more complete picture of the heterogeneity of the massif, clarify the position of lithological boundaries and slip surfaces, to highlight areas of local disturbances. Geophysical methods also help outline the optimal location of boreholes and field testing points of soils, determine the depth of monolith sampling in order to clarify information about the properties of soils located in weakened zones. Capabilities of electrical and seismic tomography, which significantly clarify and supplement the engineering-geological survey data, are considered on the example of assessing the stability of the landslide slope near the Kabardinka village (Krasnodar Territory). A series of calculations were made and the results obtained without using geophysical methods and with electrical and seismic tomography data were compared. The slope stability coefficient calculated without using geophysical data was 1.31, which allows you to assign the slope to the category of conditionally stable with a low stability margin. The calculation considering the correction of the roof position of flysch strata on the base of geophysical data showed higher stability coefficient - 1.61, which transfers the slope from the category of conditionally stable to the category of stable. After additional geophysical information on local zones of weakened soils was added to the calculation model, the stability coefficient decreased and was 1.55 i.e., the slope should be considered stable.