LSM 5.1: TYPES OF INFORMATION RESOURCES, SELCETION PRINCIPLES INCLUDING COMMUNICATION MEDIA-1

Information resources are of two kinds, namely, Documentary and Non-Documentary Sources.

A document may be a macro-document like a book, monograph, thesis, dissertation, report, etc., or a micro-document like an article in a periodical. Documents have also been grouped as Conventional, Non-Conventional, NeoConventional, Meta documents,etc

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Non-Documentary Sources:

• Institutional Sources
• Human Sources
• Colleagues
• Peers
• Information Gatekeepers
• Guides, Advisors, Consultants
• Vendors, Contractors, Collaborators, etc

1. Conventional
2. Neo-conventional
3. Non-conventional
4. Meta Documents

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Non-conventional documents are a record in nonconventional size, shape or material

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Meta-documents are a record of phenomena madedirectly, unmediated, by the human mind. They are an instrument-record of naturaland social phenomena made possible by instrument technology, photography, radar etc.

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The schemes of classification advocated by Hanson and Grogan are mainly based on the information characteristics of documents. Hanson divides documents into two categories – primary and secondary. Grogan goes further and categorises them as primary, secondary and tertiary.

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Primary Documents: These documents represent new knowledge or new interpretation of old knowledge. They are the first published records of original research and development. Often a primary document may be the only source of information in existence. According to Hanson, books, journals, reports,
patents, theses, trade literature, and standards are the primary documents Grogan adds to the list conference proceedings and official publications, but excludes books.

Secondary documents are of three types:

(a) Those which index selected portions of primary literature and help users in finding what has been published on a give subject, such as indexes, bibliographies, abstracts, etc.

(b) Those which survey elected portions of the primary literature to help users find the state-of-the-art
knowledge on a given subject, such as reviews, treatises, etc.

(c) Those documents which themselves contain the desired information collected and
selected from primary documents

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Tertiary Documents: Tertiary documents list secondary documents. Their function is to help researchers in retrieving secondary sources. Directories, Yearbooks, Bibliographies of Bibliographies, Lists of Research-in-Progress projects, Guides to Literature, Guides to Organizations, Guides to Libraries,
and Textbooks are included in this category of documents.

Table Courtesy: William Madison Randall Library

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