How do you solve the contradiction between the statistician’s ethos and his taking into account of feedback even when this feedback appears to him only as regrettable obstacles to his mission, which he sees as an unbiased reflection of reality delivery? It is impossible to isolate one moment of the measurement, which would be independent from its uses, and particularly from the conventions which constitute the first step of quantification. It would be necessary to open up the statisticians’ training by complementing it with elements from history, politics, and sociology of statistics, econometrics, probabilities, accounting, and management. This program, inspired by sciences studies results (Pestre, 2006), could make it easier to take into consideration quantitative tools in social debates, without falling in an a priori rejection, nor in an unconditional and naïve respect in front of “indisputable, because quantified, facts”.