With the new ISO 14.001 the environmental management system opens up to the drift of the unification of ISO standards for greater ease, in practice, for the implementation, review and maintenance of ISO standards in organizations that they make the great effort to implement a system of quality and above all, of environmental management. The following are the main changes between the two regulations that are the subject of study in this article, and where it is tried to shed some light on the substantive question: The new ISO 14001 marks a trend towards the unification of the ISO standards?