Abstract
Systems with unorganized keywords have been found increasingly unsatisfactory, and classificatory devices (broader or narrower terms, etc.) have been introduced into thesauruses, or structural devices (links, roles) have been used; man-machine interaction is really a means of getting re-classification done by the user. Fully structured systems (Gardin, Farradane) are being investigated. Results by means of relational indexing are showing high values for both recall and precision (or zero or low discard ratios), showing the value of structured (pre-coordinate) indexing in combination with browsing techniques by means of concept organization (new generalized classificatory principles). The computer techniques required to apply these methods are discussed; they may include associative memories, simultaneous access to structure-linked terms, and browsing facilities.
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