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The term ‘vocabulary control’ refers to a limited set of terms that must be used to index documents, and to search for these documents, in a particular system. It may be defined as a list of terms showing their relationships and used to represent the specific subject of the document.

An information system may help the user by explicitly assigning index terms (that is, words or notations) to the documents and controlling, at least in the case of alphabetical (word) systems, the semantic and often the syntatic relationships between these index terms the words (which may be subject headings or descriptors) are assigned from recognized subject heading lists or thesauri, and the notations from recognized classification schedules, and thus use controlled vocabulary. A controlled vocabulary is one in which there is only one term or notation in the vocabulary for any one concept. The Library of Congress List of Subject Headings is an example of a controlled alphabetical vocabulary, and the Dewey Decimal Classification is an example of a notational vocabulary (By definition, all notational vocabularies must be controlled).

The controlled vocabulary performs several tasks:
It usually explicitly records the hierarchical and affinitive/associative relations of a concept. Examples: Allergy, narrower-term: Hay fever; 385 (Railroad transportation), 381.1 (economic aspects of railroad transportation)
It establishes the size and scope of each topic. For example, whether or not the word baseball or the notation 796.357 is to include the concept softball.
In addition, for word based systems, the controlled vocabulary identifies synonyms terms and selects one preferred term among them. For homonyms, it explicitly identifies the multiple concepts expressed by that word or phrase. In short, vocabulary control helps in overcoming problems that occur due to natural language of the document’s subject. Hence, if vocabulary control is not exercised different indexers or the same indexer might use different terms for the same concept on different occasions for indexing the documents dealing with the same subject and also use a different set of terms for representing the same subject at the time of searching. This, in turn, would result in ‘mis-match’ and thus affect information retrieval.


Subject Heading List
List of Subject Headings-General Principles
Structure of Thesaurus
Relationship Between Terms
Thesauri and Subject Headings List
Thesauri and Classification Schemes
Systematic Arrangement

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Dear Professionals, recently while studying about RDA, I haven't found whether any library in India has implemented RDA?
Can anyone help/ suggest about this issue.!

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New RDA Toolkit Design + Implementation of the LRM in RDA + RDA Toolkit Update, February 14, 2017

RDA Cataloging News and RDA Bibliography article of Resource Description & Access (RDA) or RDA Blog blog is updated with a new updates providing details of the new RDA Toolkit design and Implementation of the LRM in RDA

RDA Toolkit website has got a new elegant design:
At the top, there are 7 main links/menus, viz., HOME, SUBSCRIBE, NEWS & INFORMATION, TRAINING RESOURCES, RDA IN TRANSLATION, SHOP RDA, and MORE RESOURCES. The HOME refers to the RDA Toolkit home page. SUBSCRIBE menu has submenus: Pricing, New Subscriber, Renew, Authorized Distributors, Consortia, and Purchase Offline. NEWS & INFORMATION follows which is like a blog with new updates on RDA … … ...

Implementation of the LRM in RDA:
The RDA Steering Committee (RSC) agreed at its November 2016 meeting to adopt the draft IFLA Library Reference Model (LRM) as a conceptual model for the development of RDA: Resource Description and Access, replacing the Functional Requirements family of models (FRBR, FRAD, and FRSAD) that are superseded by the LRM … …

RDA Toolkit Update, February 14, 2017:
A new release of the RDA Toolkit is published on Tuesday, February 14. This release contains a small number of Fast Track changes made through the normal Fast Track process … … ...
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Implementation of the LRM in RDA

The RDA Steering Committee (RSC) agreed at its November 2016 meeting to adopt the draft IFLA Library Reference Model (LRM) as a conceptual model for the development of RDA: Resource Description and Access, replacing the Functional Requirements family of models (FRBR, FRAD, and FRSAD) that are superseded by the LRM.

Although the LRM is not yet approved and published by IFLA, the RSC wishes to be proactive at this stage because the final draft submitted for approval is not expected to undergo significant changes. The RSC will continue to monitor the LRM through its protocol with the FRBR Review Group.

The RDA Toolkit Restructure and Redesign (3R) Project will aim for compatibility between the current RDA entities and elements and the LRM, and will use the LRM to guide the development of RDA Toolkit for international, cultural heritage, and linked data communities. The consolidation of gaps and inconsistencies in the preceding conceptual models gives the opportunity for the long-awaited evolution of the treatment of agents, aggregates, and other under-developed areas of RDA. The first significant impacts of the LRM will appear in the April 2018 release of RDA Toolkit.

This announcement gives an initial indication of what those impacts will be. Except where specifically noted, the RSC does not expect current interpretation and application of RDA to be changed. Instead, additional methods for creating and maintaining coherent RDA data will become available.

Three completely new entities will be added to RDA: Collective Agent, Nomen, and Time-span. Two other entities that are already implicit in RDA, Agent and Place, will be added and consolidated... ...

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The Cataloging and Metadata Services Unit at Utah State University 's Merrill-Cazier Library recently set out to map out the general workflows of the unit, including where material comes in, how it is handled, and where it goes after it leaves the unit.


Here is the workflow specific to our general research collections. These workflows are specific to physical collections that are being cataloged in MARC for the integrated library system (ILS).

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Not related to Librarianship Studies or RDA Cataloging: Ignore

Happy Healthy New Year 2017 to Library Professionals

Dear Library and Information Science Professionals, wish you all a very happy, healthy, and prosperous new year 2017.

My 8 blogs including "Resource Description & Access (RDA)" and "Librarianship Studies & Information Technology" are a reflection of my quest for knowledge in Library and Information Science.

The articles written in these blogs started with my desire to learn about those topics. For this, I use to carry out extensive study and research on those subjects and write in an organized way so that I may refer to the presented information later on, whenever I need. I do this, as the capacity of the brain is limited to hold and remember information. At the same time, I thought there are many library professionals who desire to learn for the same information, so I also share the information about the articles published on my LIS blogs through the social media...

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