This article explores the efforts of statisticians to standardize their graphical methods, diagrams and maps, in their international congresses, then in the International Institute of Statistics. The discussions focused mainly on choropleth maps, selection of class intervals and tonal shadings. Ultimate failure resulted not from different graphical traditions, but from theoretical uncertainties concerning the general principles of the code they wanted to create.Lors de leurs congrès internationaux, puis dans le cadre de l´Institut international de statistique, les statisticiens envisagent une standardisation des méthodes graphiques, cartes et diagrammes. Leurs discussions concernent essentiellement les cartes choroplèthes : méthodes de disc...