Abstract: The editors’ note focuses on the study of materials, which has has been reinvigorated by scientific events, training, multidisciplinary thesis offers, their patrimonialization, and anthropological analysis. It introduces the articles in the issue in a key of certainty and doubt. How does one deal with uncertainty? By analyzing the antecedents, preparing the sites, laying the groundwork for the stages in the process, or using expertise. How does one revisit an apparent certainty? By rethinking it, sequencing an operation, or establishing the sources of a discipline.
