Occupational Safety and Health is a field composed of an wide variety of subjects. Frequently, there is differt understanding of the aims of OSH, of the principles and fundamentals that should guide its action and even of  the meaning of OSH concepts. This lack of common language hinders the establishment of a shared viewpoint  and basis for fruitful work on OSH. This Module has the aim of serving as a reference guide in this regard and  of giving general information on most common hazards that exist in most enterprises.