Reviews and discusses critically the development during the last decade of the cognitive approach to information retrieval research and theory. The focus is analytic and empirical research on the complex nature of information need formation and situation, their inherent association with the concept of relevance, and the development of cognitive…

Discusses impact of three selected command language facilities (positional or free text operations, crossfile searching, term frequency analysis--ZOOM) on the man-system interface in relation to operational online information retrieval (IR). A cognitive IR model, searchers' knowledge structures, and searching with different types of command…