The contracting of works or services in the business field, regular practice currently, takes partner several companies' confluence or people self-employed workers in the same work centre, which it can cause because of the interaction of different developed activities and of inherent risks that each takes partners, situations in which the possibility of accident is seen aggravated, as also its potential consequences.
It is for this reason that the standard in risk prevention at work it dedicates special attention to these situations, in the article 24 of the law of risk prevention at work , and in its development in the Royal Decree 171/2004, establishing the need of carrying out a coordination of business activities to control those interactions and to guarantee that companies or concurrent self-employed workers people act in a coherent way to principles of the preventive action and they apply correctly work methods.