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Definition
There are a number of definitions of 'thesaurus' provided by different experts and organisations. The most comprehensive one has been provided by the International Standards Organisation (ISO) as the basis of structure and functions of a thesaurus. In terms of functions, it states "a thesaurus is a terminological control device used in translating from the natural language of documents, indexers or users into a more constrained 'system language' (documentation language, information language)". In terms of structure, the Standard says, "a thesaurus is a controlled and dynamic vocabulary of semantically and generically related terms which covers a specific domain of knowledge".
In short, a thesaurus may be defined as a compilation of descriptors for use in an information retrieval system arranged in an alphabetical order and manifesting the various types of relationships existing between the descriptors. An information retrieval thesaurus is a kind of semantic networking of concepts.
SUBJECT AUTHORITY FILE Meaning Most libraries maintain a subject authority file consisting of subject authority records in order to ensure uniformity and consistency
Functions The primary functions of indexing and abstracting periodicals are: to keep scholars and information users abreast of current literature in their areas of int
Directories Directories are very useful to locate answers to agency or bibliographical quiries as they cover information about organisations and their members, as well as not
Factors Governing Subject Indexing Systems There are many factors that govern the design of subject heading systems. Some of the more important ones are: content analy
STANDARDS Standard relates to quality of product in use in our daily life. They cover not only house-hold goods, but the various products that we need for living in this world:
what is the definition of the concept foreign aid?
Standard Vocabulary As SLSH is not backed by any library collection, so updating and revision of subject headings cannot keep pace with changing current terminology and grow
Commercial Cataloguing When centralised processing like preparation and sale of catalogue entries on-cards is undertaken by an agency as commerical proposition we may call it
Coverage by Geographical Area There are indexing and abstracting services with coverage limited to literature of a particular country. Various countries bring out national I &
State of the Art - Purpose and Presentation The State-of-the-Art Reports are of several types. They vary marginally in the presentation of the content. Though, their key purpo
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