What duties have independant worker in the field of prevention of labour risks, how applied you the relevant legislation, as well as the guidelines to be followed in the field of health and safety at work, are issues does not know that, on numerous occasions, respond the worker self-employed. And it is that the information gap in this topic is large enough, being evident that the self-employed and SMEs constitute the segment that presents greater difficulty to incorporate the prevention of occupational risks in their activities.Law 54/2003, reform of the regulatory framework for the prevention of occupational risks, has introduced important modifications to the 31/1995 law of prevention of occupational risks affecting the Group of self-employed workers. The regulation is also main (RD 1273 / 2003) coverage of occupational contingencies of the workers included in the special regime of the Social security of workers on their own, and the extension of the temporary incapacity allowance for the self-employed workers. Thus, self-employed worker can choose or choose the coverage of occupational contingencies, thus extending the legal definition of accident at work and professional disease that previously excluded self-employed workers.RD 171/2004, (by which article 24 of law 31/1995, of occupational risk prevention, develops in the field of coordination of business activities), is a major reason (especially in the construction sector) by which the self-employed worker must raise awareness of the need to implement a preventive culture in their daily work.Coordination of business activities that can be observed in various scenarios: a. concurrency in a very center of work of two or more companies, in which case, companies and self-employed workers (who carry out their activity in the workplace, or not exist legal relations between them) should cooperate in the implementation of the regulations on occupational health: B. Concurrence of workers from several undertakings at a job center that a businessman is the holder, whom complying with the principle of cooperation, should take the necessary measures so that those other entrepreneurs and self-employed workers, engaged in activities in their workplace receive adequate instructions about hazards in the workplace, and comply with appropriate protection and prevention measures.