Land degradation is an increasing problem in many parts of the world. Success in fighting land degradation requires an improved understanding of its causes, impact, degree and acquaintance with climate, soil, water, land cover and socio-economic factors. Therefore, land degradation assessment is a primary goal in a decision support system for reversing degradation. Fortunately, scientists around the world started long ago to look at the problem and have developed assessment and monitoring methods. This study, aimed at exploring and reviewing existing assessment methods, used a global, regional, local and field/farm levels in an attempt to assess land degradation issues. This paper discusses and describes various methods for assessing land degradation and its processes.