This updated classic reference provides a dependable and comprehensive work for geotechnical engineers and students taking an engineering approach to slopes. Questions of stability and instability underlie the coverage of the book. This requires an appreciation of the properties of various geomaterials, an understanding of shear strength and analysis techniques, and the actions of groundwater. The book provides guidance on remedial and corrective measures, as well as on the investigation of landslides, and is well illustrated with case histories.