International audienceThis paper aims to introduce two main concepts regarding safety management which are injunction and order. In a first section, those two kinds of communication for action will be defined and distinguished through responsibility repartition criterion. Indeed, while injunction device involves addressee’s commitment regarding action design, order device is a less complex one in which a specific authority is responsible of order content in a specific frame while the addressee is generally only responsible of the order content execution. To illustrate those concepts potential, injunction and order contribution to face an emergency situation will be demonstrated through local field management and Headquarter relationship analysis during a crisis exercise of major magnitude in a nuclear fuel cycle industry. As a general conclusion regarding safety management, one would note that injunction use ensures decision-making robustness by subjectivity mobilization, as challenging voices multiplication participates to solid evidence emergence thanks to cross-checking practices. Secondly, the specific result of this demonstration remembers one of the Fukushima-Daiichi management lessons, meaning that in a resilient system, Headquarter tends to communicate with Local Management Team through injunction