Library and Information Science

Recently the increase of documents or reports in volume is rapid, so it becomes necessary to develop new techniques or methods to process such documents by using computers. This entails the new approaches and thoughts about conventional concepts of information and library science. First of all this paper describes new thoughts based on a statistical approach about and relations between such terms as abstracting, indexing and classification, all of which are concerned closely with the following concepts, namely, category, information storage and retrieval pattern, and probabilistic and deterministic approaches. Secondly the paper describes known existing techniques of abstracting, indexing and classification from the above mentioned point of view. Lastly it describes the lack of consideration about retrieval in today’s such methods, especially classification methods.