François Bavaud is associate professor in quantitative methods at UNIL (Department of Language and Information Sciences, Faculty of Arts; Institute of Geography and Sustainability, Faculty of Geosciences and Environment). He was first educated as a theoretical physicist (Diploma UNIFR 1982; PhD EPFL 1986). After lecturing in applied mathematics (Heriot-Watt University, Scotland), he hold various positions in quantitative methods for the Humanities, Geography and Social Sciences at UNIL, UNIGE and UNIFR. His research interest cover Information Theory, Spatial Autocorrelation and Classical multivariate Data Analysis, in particular factorial and clustering methods applied to networks and textual data. He is confident that, without a well-defined and well-mastered formalism, little can be achieved in the long run.