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Landsliding is one of the many natural processes that shape the surface of the earth. It is only when landslides threaten mankind that they represent a hazard. Landslides belong to a much broader group of slope processes referred to as mass movement. The definition of mass movement includes all those processes that involve the outward or downward movement of slope-forming material under the influence of gravity. Some mass movement processes, such as soil creep, are almost imperceptibly slow and diffuse while others, such as landslides, are capable of moving at high velocity, are discrete, and have clearly identifiable boundaries, often in the form of shear surfaces (Crozier, 1999a). Landslides are a manifestation of slope instability. This chapter discusses the stability of slopes, the factors that promote instability and the adverse effects that landslides can have on human well-being, land and livelihood. In …