[en] The company's knowledge and know-how take the concrete form of documents (texts, photographs, video tapes). For purposes of transmission, they must not only be stored, in electronic form today, but also retrieved easily and quickly. To further that end, Gaz de France (GDF) has compiled a bilingual (French, English) thesaurus on the gas industry. The English version was prepared in conjunction with NGTC, Canada's Natural Gas Technologies Center. This thesaurus, comprising descriptors organized according to relationships of genericness, specificity, association and documentary synonymity, is an integral part of the engineers' working enviroment at the NGTC, and GDF. The electronic version facilitates its use by company employees. Constantly available, it is helpful in describing and finding information readily. As a result of studies conducted in this regard: design and maintenance rules have been developed for the thesaurus; the thesaurus has been disseminated to all the engineers in the Company; the thesaurus has been incorporated in the Company's Electronic Document Management system. (au)