Information retrieval consists of two processes, storage and search of information. Information storage process includes database production, indexing, and preparation of document file and index file (inverted file). Search process includes understanding information need of the user, formulating search objectives, making up search statements, execution of search, and evaluation of search results. Online searchers are required to understand not only these processes but also various search functions, that is, boolean logic, truncation, proximity searching and so on, commands of IR system, search strategy construction, selection of index terms, and so on. Many of CD-ROM search systems are easy to use and share common concepts and principles of retrieval with online systems, while some systems have hyper-text features.
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