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Within the framework of a research project into alternative ways of representing documentation languages and into their flexibility, an attempt is made to draw up a list of performance criteria that an ‘ideal’ thesaurus graphic display should respect. However, a study of the main bibliographies listing thesauri, shows that less than 6 per cent of them contain graphic displays, even though a concurrent literature survey reveals that such displays offer many potential advantages. Up to now, use of displays was probably limited by technology and by the rarity of studies into the cognitive processes of the users of automated systems. Current research in several disciplines (computer graphics, ergonomic psychology and spatial representation) should contribute to the emergence of new types of documentation retrieval tools, well adapted to a broader and more diversified clientele.