It means the adequate listing of records of knowledge in all forms, including published as well as unpublished documents. There should be an effective access to information about documents in the subject by providing systematic bibliographies. Bibliographical control deals with the whole range of bibliographies consisting of comprehensive, elective, current and retrospective ones. These different bibliographies should complement each other so that they are able to satisfy different points of views and approaches. The objective should be that a set of bibliographies in a given subject taken together are able to achieve bibliographical control on each major branch of knowledge.
In October 1961 the International Conference on cataloguing principles was held in Paris. This is known as “Paris Principles”. The principles apply to choice and form of headings only.
There are various factors which control the knowledge through bibliographies or by listing the knowledge to present before the readers, i.e. Dictionary catalogue, Classified catalogue, Union catalogue, Library catalogue, Book catalogue, Card catalogue, Computer-output microform catalogue, On-line catalogue, Shelf-lists subject catalogue, Mechanical catalogue, (Mark format), Index abstracts, Cumulative indexes.