This paper proposes a common indicator of robustness for two classical choice functions (Maximin and Borda) regarding a variation of the weights of the criteria. After a few recalls, we shall present simple similar indicators (one for each function) that allow the measurement of the “local” robustness of the functions, i.e. for one given function, the comparison of the robustness in two different points. These local indicators induce the principle of a global indicator, the value of which can be evaluated through a class of random profiles. We discuss the relevance of the proposed indicators. We also validate an hypothesis according to which Maximin would be more robust than Borda regarding a variation of the weights of the criteria.