72~ P o p p i , ibid.-7 3) M o d e s t i n i , ibid.-74) T o m m a s i. ibid.

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This paper introduces an associative information retrieval model based on the two-level architecture proposed in [Agosti et al, 1989a] and[Agostiet al, 1990], andan experimental prototype developed in order to validate the model in a personal computing environment. In the fiist part of the paper, related work and motivations are presented. In the second pert, the model, entitled EXPLICIT, is introduced. EXPLICIT is basedon a two-level architecture which holds the two main parts of the informative resource managed by an information retrieval tool: the collection of documents and the indexing term structure. Theterm structure is managed as a schema of concepts which can be used by the final user as a frame of reference in the query formulation process. llemodel supports theconcurrent use of different schemas of concepts to satisfy information needs of different categories of users. Inthethird part of the paper, the main characteristics of the experimental prototype, named HyperLaw, are presented.

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