http://popups.lib.uliege.be/1373-5411/index.php?id=4647 Designing an Human Space Autonomous system for Mars exploration, need a framework for understanding the relations between safe Trajectories and the requirements for propulsion systems design, in particular to prevent and reduce risks for the astronauts during the transit phases Earth-Mars-Earth. This paper proposes an approach for modelling Human-Organisation-Environment lead by the safety point of view. Our perspective is that the propulsion system needs to exhibit some aptitudes at each step of the mission. Its structure must be able to evolve in front of some unforeseen situations during the flight. Before and during the design stage, different paths of modeling are possible. Our paper proposes a new approach for modeling that allows to merge different hypothesis in link with a subjective approach for risks. Cooperation is required at the early stage of the project and the quality of the result is fundamentally inseparable from the problem formulation perceived from different points of view. Full text issues Volume 23 Systems Research, Applied Logic and Mathematics fr Mon, 14 Oct 2024 15:43:33 +0200 Mon, 14 Oct 2024 15:43:40 +0200 http://popups.lib.uliege.be/1373-5411/index.php?id=4647 0