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This article reviews some of the more unconventional text retrieval systems, emphasising those which have been commercialised. These sophisticated systems improve on conventional retrieval by using either innovative software or hardware to increase retrieval speed or functionality, precision or recall. The software systems reviewed are: AIDA, CLARIT, Metamorph, SIMPR, STATUS/IQ, TCS, TINA and TOPIC. The hardware systems reviewed are: CAFS‐ISP, the Connection Machine, GESCAN,HSTS,MPP, TEXTRACT, TRW‐FDF and URSA.

In the third paragraph, the author states that ‘Conventional text retrieval systems suffer from a number of problems. First, indexing terms and / or classificators have normally to be assigned manually, which is a very time‐consuming process and can lead to severe problems with regard to inter‐indexer consistency.’ To what types of systems does this refer? From a content perspective it would appear to be addressing the problems of a keyword system, also referred to as a document coding system. Yet, they are referred to as ‘conventional text retrieval systems.’ Manual indexing is not a component of today's text retrieval system, elementary or advanced.