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Lancaster, F.W.: On the need for role indicators in postcoordinate retrieval systems (1968) 0.03
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Abstract

A summary of the findings of various evaluations of role indicators is given. In general, the results have been negative in that little real evidence for the value of the devices has been presented. The need for roles in various subject fields and in very large systems, is discussed. They can only by justified on purely ecomic grounds - if the added cost involved in their use is offset by substantial reduction in the amount of output screening that must be done by the end user

Blagden, J.F.: How much noise in a role-free and link-free co-ordinate indexing system? (1966) 0.02

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Source: Journal of documentation. 22(1966), S.203-209

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