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Our study aimedto collect enhancement proposals of Rafale fighter aircraft human-system interface. Proposals had to be innovative and complied with the needs of information for pilots regarding Rafale future capabilities. We developed amethodology based on a device enabling the simulation of a dynamic system activity that is theRafale integrated in its war environment. Creativity of front line pilots participating inthis experimentation has been stimulated but constraint by the necessity ofa useful production due to the risks associated to the modification of a fighter aircraft already operating since 2006. Each proposal has been analyzed and synthetized through the abstraction hierarchy model of Rasmussen (1986). Results showed that for prospective and retrospectivefields,a specific tactical support built with models favored the expression of functional objective and that a board as a basic human-system interface favored the expression of physical functions. In the discussion, we supported the relevance of our methodology for the definition of human-system interface requirements in various dynamic systems.