The basic information used in the catalogue comes from the very extensive documentary archive of the Fundació Gala-Salvador Dalí, and has been supplemented with material from the equally important archive of The Dalí Museum in St. Petersburg (Florida, USA) as well as the Museo Nacional Centro de Arte Reina Sofía (Madrid), which have been generous with their cooperation at all times. We have also consulted the archive of the Centre Pompidou in Paris, and the Museum Boijmans van Beuningen in Rotterdam has helped us trace works in private collections and elsewhere, notably in the Sotheby's, Christie's and Bonhams auction houses.
Moreover, in establishing technical data about which there has been some doubt we have benefitted from the scientific collaboration of the Conservation and Restoration departments of the Museo Nacional Centro de Arte Reina Sofia in Madrid and the Faculty of Fine Arts at the University of Barcelona.
The working process is organized as follows:
- We examine the works attributed to Dalí that are known to us. Where we are unable to examine the work directly, we study photographs of it and the information provided by museums and private collectors. In cases where attribution is dubious, we do not include works about which there is insufficient information in the catalogue. This does not mean that these works cannot be attributed to Dalí, but that the available information does not allow us to be certain that the work in question is by the artist. Regarding the period 1940-1951, research and access to objective data has been very difficult because Dalí lived and worked in the United States from 1940 to 1948.
- We compare the visual examination with photographic documentation and audio-visual material and with the available information (provided by the current owners of the work, experts and institutions).
- Where possible we cross-check the information against a second source, such as:
- the Documentary Archives of the Fundació Gala-Salvador Dalí
- other archives:
- for works before 1929, the archive of the Abelló Museum in Mollet del Vallès
- for works up until 1939, the archive of the Julien Levy Gallery in New York
- for works up until 1951, the archives of the Smithsonian Institution, the Museum of Modern Art and the New York Public Library in New York