No firm conclusions are to be drawn from the interim reports on the Aslib‐Cranfield Project, as the author himself has emphasized. One thing has, however, emerged fairly clearly, and that is that the economic efficiency of the facet index used at Cranfield has been seriously impaired by the chain indexing. It is true that most of this was done very quickly by clerical assistants; nevertheless if, as has been claimed, the technique is automatic, it should not be difficult to delegate it to clerks without loss of efficiency.
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