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The lesson that is to be learnt is that should new research get underway it will be very important to have a suitable data base ready
...Information retrieval systems are likely to play an every increasing part in the community
...One major recent development is that computers and data bases are becoming linked into A study recommending the provision of such an experimental test bed has recently been completed,see Sparck Jones and van Rijsbergen,Information retrieval test collections,Journal of Documentation,32,59 75 1976
...networks
...By extending the user population to include the non specialist,it is likely that an IR system will be expected to provide not just a citation,but a display of the text,or part of it,and perhaps answer simple questions about the retrieved documents
...To bring all this about the document retrieval system will have to be interfaced and integrated with data retrieval systems,to give access to facts related to those in the documents
...Another example can be found in the context of computer aided instruction,where it is clearly a good idea to give a student access to a document retrieval system which will provide him with further reading on a topic of his immediate interest
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One INTRODUCTION Information retrieval is a wide,often loosely defined term but in these pages I shall be concerned only with automatic information retrieval systems
...To make clear the difference between data retrieval DR and information retrieval IR,I have listed in Table 1
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Table 1
...Data Retrieval DR Information Retrieval IR Matching Exact match Partial match,best match Inference Deduction Induction Model Deterministic Probabilistic Classification Monothetic Polythetic Query language Artificial Natural Query specification Complete Incomplete Items wanted Matching Relevant Error response Sensitive Insensitive between the two is a vague one
...Let us now take each item in the table in turn and look at it more closely
...The inference used in data retrieval is of the simple deductive kind,that is,a R b and b R c then a R c
...Another distinction can be made in terms of classifications that are likely to be useful
...The query language for DR will generally be of the artificial kind,one with restricted syntax and vocabulary,in IR we prefer to use natural language although there are some notable exceptions
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CHAN,F
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...CHOU,C
...CHOW,C
...CLEVERDON,C
...CLEVERDON,C
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...CLIFFORD,H
...CLIMENSON,W
...COATES,E
...CODD,E
...COLE,A
...Comparative Systems Laboratory,An Inquiry into Testing of Information Retrieval Systems,3 Vols
...CONOVER,W
...COOPER,M
...COOPER,W
...COOPER,W
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...COOPER,W
...CORMACK,R
...COX,D
...CROFT,W
...CROFT,W
...CROFT,W
...CROUCH,D
...CUADRA,A
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