Archives are tools of research and verification for the editor of a catalogue raisonné. They are of all types: catalogues and various publications, letters, articles, photographic documents, testimonials, studies of writing, scientific analysis and observations. The archives are gradually being enriched by new contributions made by the artist's friends and acquaintances as well as exhibitions or conferences devoted to him.
More and more often, the people who produce the catalogue of an oeuvre come together in associations or meet at conferences. These professional exchanges, as well as the very rapid progress of scientific means, are in the process of defining the future conditions of academic research in art as much as the future conditions of the art market.